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/**
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* Copyright (c) 2009 Colony Project
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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**/
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/**
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* @file xbee.c
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* @brief XBee Interface
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*
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* Implementation of low level communication with the XBee in API mode.
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*
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* @author Colony Project, CMU Robotics Club
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**/
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#include <lights.h> |
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#include <string.h> |
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#include <avr/io.h> |
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#include <avr/interrupt.h> |
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#include <time.h> |
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#include <wl_defs.h> |
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#include <wireless.h> |
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#include <eeprom.h> |
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#include "xbee.h" |
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/* Internal Function Prototypes */
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/* I/O Functions */
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static int8_t xbee_send_string(uint8_t* c);
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/* Command Mode Functions */
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static int8_t xbee_enter_command_mode(void); |
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static int8_t xbee_exit_command_mode(void); |
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static int8_t xbee_enter_api_mode(void); |
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static int8_t xbee_exit_api_mode(void); |
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static int8_t xbee_wait_for_string(uint8_t* s, uint16_t len);
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static int8_t xbee_wait_for_ok(void); |
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/* API Mode Functions */
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//TODO: does this exist? static int8_t xbee_handle_packet(uint8_t* packet, uint16_t len);
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static int8_t xbee_handle_at_command_response(uint16_t command, uint8_t status, uint8_t len);
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static void xbee_handle_status(uint8_t status); |
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static int8_t xbee_verify_checksum(uint8_t* packet, uint16_t len);
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static uint8_t xbee_compute_checksum(uint8_t* packet, uint16_t len);
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static int8_t xbee_send_frame(uint8_t* buf, uint16_t len);
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int8_t xbee_send_read_at_command(uint8_t* command); |
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static int8_t xbee_send_modify_at_command(uint8_t* command, uint8_t* value, uint8_t len);
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/* Buffer Manipulation Functions */
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int8_t xbee_basic_buf_add(uint8_t *ptr, uint8_t byte); |
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uint8_t xbee_basic_buf_get(uint8_t *ptr); |
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int8_t xbee_other_buf_add(uint8_t *ptr, uint8_t byte); |
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/* private functions */
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int8_t check_last_receive(uint16_t source,uint8_t framenum); |
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inline uint8_t getStatus(uint8_t mask);
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inline void setStatus(uint8_t mask,uint8_t value); |
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/*Global Variables*/
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// last few packet sources and frame nums
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#define NUM_LAST_PACKETS 10 |
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struct {
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uint16_t source; |
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uint8_t framenum; |
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} lastPacket[NUM_LAST_PACKETS]; |
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// array for basic packets
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uint8_t xbee_basic_buf[PACKET_BUFFER_SIZE]; |
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// beginning of first packet in basic buffer
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uint8_t basic_buf_first = 0xFF;
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// byte after end of last packet in basic buffer (only access < basic_buf_last)
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// aka, the first free byte in basic buffer
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uint8_t basic_buf_last = 0;
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// array for other packets
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uint8_t xbee_other_buf[PACKET_BUFFER_SIZE]; |
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// beginning of first packet in other buffer
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uint8_t other_buf_first = 0xFF;
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// byte after end of last packet in other buffer (only access < other_buf_last)
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// aka, the first free byte in other buffer
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uint8_t other_buf_last = 0;
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// xbee status
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#define XBEE_API_OFF 0x00 |
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#define XBEE_API_ON 0x10 |
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#define XBEE_API_ESCAPE 0x20 |
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#define XBEE_API_MASK 0x30 |
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#define XBEE_COMMAND_WAIT 0x80 |
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#define XBEE_COMMAND_RESPONSE 0xC0 |
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#define XBEE_COMMAND_NONE 0x00 |
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#define XBEE_COMMAND_MASK 0xC0 |
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#define XBEE_NOT_INITD 0xF0 |
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#define LAST_PACKET_MASK 0x0F |
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uint8_t xbee_status = XBEE_NOT_INITD; |
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// xbee command response (for PAN, channel, address, etc)
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static uint8_t xbee_command[8]; |
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// external ack handler (wireless_send.c)
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extern void ackhandle(uint8_t num,uint8_t val); |
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/**@addtogroup xbee
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* @{ **/
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/*Function Implementations*/
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/**
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* Interrupt for the robot. Adds bytes received from the xbee
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* to the buffer.
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**/
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#ifndef FIREFLY
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#define PORT UDR1
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#define FLAG (UCSR1A & (1<<RXC1)) |
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ISR(USART1_RX_vect) { |
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#else
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#define PORT UDR0
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#define FLAG (UCSR0A & (1<<RXC0)) |
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SIGNAL(SIG_USART0_RECV) |
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#endif
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// start of frame
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uint8_t apitype = PORT; // get frame start byte
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uint16_t i=0;
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uint16_t len=0;
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// check that we're in API mode
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if (getStatus(XBEE_API_MASK) == XBEE_API_OFF || apitype != XBEE_FRAME_START) {
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// not in API mode
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WL_DEBUG_PRINT_P("|api off branch");
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if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT) {
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// get rest of command and put in basic buf
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xbee_basic_buf[i] = apitype; |
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if (xbee_basic_buf[i++] != '\r') { |
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while(i < PACKET_BUFFER_SIZE) {
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if (FLAG) {
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xbee_basic_buf[i] = PORT; |
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if (xbee_basic_buf[i] == '\r') |
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break;
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i++; |
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} |
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} |
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} |
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WL_DEBUG_PRINT_P("got packet, len=");
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WL_DEBUG_PRINT_INT(i); |
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WL_DEBUG_PRINT_P("str=");
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WL_DEBUG_PRINT(xbee_basic_buf); |
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// signal handler that command response is done
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setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_RESPONSE); |
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} |
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WL_DEBUG_PRINT_P("return\r\n");
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return;
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} |
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//WL_DEBUG_PRINT_P("|api on branch");
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// get length and type
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while(i<3) { |
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if (FLAG) {
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if (i==0) { |
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len |= PORT<<8;
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} else if (i==1) { |
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len |= PORT; |
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} else if (i==2) { |
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apitype = PORT; |
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} |
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i++; |
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} |
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} |
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// do something based on the type
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i=1;
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switch(apitype) {
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case XBEE_FRAME_AT_COMMAND_RESPONSE: {
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// AT command response
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if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE)
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return; // we're currently processing a command, so drop the incoming one ***** TODO: we need to read the whole length of the frame to do this right **** |
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uint16_t atcommand=0;
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uint8_t ptr=basic_buf_last; |
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while(i<len) {
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if (FLAG) {
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if (i==1) |
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apitype = PORT; // get frame id, but ignore it
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else if (i==2) |
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atcommand |= PORT<<8; // get command char1 |
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else if (i==3) |
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atcommand |= PORT; // get command char2
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else if (i==4) |
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apitype = PORT; // get status
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else {
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// put the command response on the basic buf temporarily
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if (xbee_basic_buf_add(&ptr,PORT) != 0) |
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break;
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} |
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i++; |
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} |
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} |
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// handle AT command
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WL_DEBUG_PRINT_P("|XBEE_FRAME_AT_COMMAND_RESPONSE");
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WL_DEBUG_PRINT_P("|i=");
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WL_DEBUG_PRINT_INT(i); |
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WL_DEBUG_PRINT_P("|len=");
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WL_DEBUG_PRINT_INT(len); |
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WL_DEBUG_PRINT_P("|status:");
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WL_DEBUG_PRINT_INT(apitype); |
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WL_DEBUG_PRINT_P("|atcommand:");
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WL_DEBUG_PRINT_CHAR((uint8_t)(atcommand>>8));
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WL_DEBUG_PRINT_CHAR((uint8_t)(atcommand&0xFF));
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WL_DEBUG_PRINT_P("|buf=");
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uint8_t ptr2 = basic_buf_last; |
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for(uint8_t j=0;j<i;j++) |
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WL_DEBUG_PRINT_HEX(xbee_basic_buf_get(&ptr2)); |
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WL_DEBUG_PRINT_P("|\r\n");
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xbee_handle_at_command_response(atcommand,apitype,len-5); // TODO: rewrite function |
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break; }
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case XBEE_FRAME_TX_STATUS: {
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// TX status
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uint8_t frame_id = 0;
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while(i<len) {
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if (FLAG) {
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if (i==1) |
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frame_id = PORT; |
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else {
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ackhandle(frame_id,PORT); // handle the status
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break;
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} |
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i++; |
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} |
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} |
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WL_DEBUG_PRINT_P("|XBEE_FRAME_TX_STATUS");
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break; }
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case XBEE_FRAME_RX_64: {
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// receive a packet with 64bit address
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WL_DEBUG_PRINT_P("|XBEE_FRAME_RX_64");
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break; } // TODO: implement this (even if we don't use it) |
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case XBEE_FRAME_RX_16: {
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// receive a packet with 16bit address
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uint16_t source = 0;
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uint8_t framenum = 0;
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uint8_t group = 0;
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uint8_t ptr=basic_buf_last; |
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while(i<len) {
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if (FLAG) {
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if (i==1) |
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source |= PORT<<8; // get source hi byte |
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else if (i==2) |
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source |= PORT; // get source lo byte
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else if (i==3) |
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apitype = PORT; // get RSSI, and ignore
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else if (i==4) |
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apitype = PORT; // get options, and ignore
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else if (i==5) { |
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framenum = PORT; // get the frame number
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if (check_last_receive(source,framenum) != WL_SUCCESS) {
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// we've already received this frame
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ptr = 0xFF; // signal to skip processing |
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break;
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} |
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} |
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else if (i==6) { |
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group = PORT; // get group number
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if (group == 0) { |
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ptr = basic_buf_last+1;
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// add source to buffer
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if (xbee_basic_buf_add(&ptr,(uint8_t)((source&0xFF00)>>8)) != 0) |
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break;
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if (xbee_basic_buf_add(&ptr,(uint8_t)(source&0x00FF)) != 0) |
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break;
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} else {
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ptr = other_buf_last+1;
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// add source and group to buffer
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if (xbee_other_buf_add(&ptr,group) != 0) |
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break;
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if (xbee_other_buf_add(&ptr,(uint8_t)((source&0xFF00)>>8)) != 0) |
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break;
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if (xbee_other_buf_add(&ptr,(uint8_t)(source&0x00FF)) != 0) |
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break;
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} |
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} |
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else { // TODO: handle escaped characters supported by APIv2 |
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// put packet data on the correct buffer
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if (group == 0 && xbee_basic_buf_add(&ptr,PORT) != 0) |
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break;
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else if (xbee_other_buf_add(&ptr,PORT) != 0) |
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break;
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} |
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i++; |
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} |
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} |
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if (ptr != 0xFF && i > 6) { |
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if (group == 0) { |
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xbee_basic_buf[basic_buf_last] = i-6; // set length |
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basic_buf_last = ptr; |
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} |
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else {
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xbee_other_buf[other_buf_last] = i-6; // set length |
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// check if we have a high priority group
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for(;;)
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if (HIGH_PRIORITY) {
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// handle receive now
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ptr = 0xFF;
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break;
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} |
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if (ptr != 0xFF) { |
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// handle receive later
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other_buf_last = ptr; |
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} |
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} |
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} |
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WL_DEBUG_PRINT_P("|XBEE_FRAME_RX_16|len=");
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WL_DEBUG_PRINT_INT(len); |
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WL_DEBUG_PRINT_P("|source=");
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WL_DEBUG_PRINT_INT(source); |
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WL_DEBUG_PRINT_P("|framenum=");
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WL_DEBUG_PRINT_INT(framenum); |
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WL_DEBUG_PRINT_P("group=");
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WL_DEBUG_PRINT_INT(group); |
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WL_DEBUG_PRINT_P("\r\n");
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break; }
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default:
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WL_DEBUG_PRINT_P("|BAD APITYPE");
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} // end of switch statement
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while (1) { |
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if (FLAG) {
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apitype = PORT; // get checksum, and ignore
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break;
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} |
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} |
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WL_DEBUG_PRINT_P("|interrupt - return\r\n");
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} // end of interrupt
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/* adds a byte to the basic buffer */
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int8_t xbee_basic_buf_add(uint8_t *ptr, uint8_t byte) { |
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if (*ptr == basic_buf_first) {
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// buffer full
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WL_DEBUG_PRINT_P("basic buffer full\r\n");
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return -1; |
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} |
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xbee_basic_buf[(*ptr)++] = byte; |
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if (*ptr == PACKET_BUFFER_SIZE)
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*ptr = 0;
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return 0; |
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} |
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/* gets a byte from the basic buffer */
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uint8_t xbee_basic_buf_get(uint8_t *ptr) { |
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uint8_t byte = xbee_basic_buf[(*ptr)++]; |
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if (*ptr == PACKET_BUFFER_SIZE)
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*ptr = 0;
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return byte;
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} |
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/* adds a byte to the other buffer */
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int8_t xbee_other_buf_add(uint8_t *ptr, uint8_t byte) { |
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if (*ptr == other_buf_first) {
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// buffer full
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WL_DEBUG_PRINT_P("other buffer full\r\n");
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return -1; |
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} |
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xbee_other_buf[(*ptr)++] = byte; |
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if (*ptr == PACKET_BUFFER_SIZE)
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*ptr = 0;
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return 0; |
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} |
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/**
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* Checks if packet is a duplicate
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**/
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int8_t check_last_receive(uint16_t source,uint8_t framenum) { |
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uint8_t i=0;
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for(;i<NUM_LAST_PACKETS;i++) {
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if (lastPacket[i].source == source && lastPacket[i].framenum == framenum)
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return -1; // duplicate packet, so return error |
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} |
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// save packet source and framenum
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i=getStatus(LAST_PACKET_MASK); |
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lastPacket[i].source = source; |
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lastPacket[i].framenum = framenum; |
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if (++i>=NUM_LAST_PACKETS)
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i = 0;
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setStatus(LAST_PACKET_MASK,i); |
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return WL_SUCCESS;
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} |
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|
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/** status functions **/
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inline uint8_t getStatus(uint8_t mask) { return xbee_status&mask; } |
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void setStatus(uint8_t mask,uint8_t value) { xbee_status = ((xbee_status&(~mask))|value); }
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|
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|
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/**
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* Initializes the XBee library so that other functions may be used.
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**/
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int8_t xbee_init() |
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{ |
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WL_DEBUG_PRINT_P("in xbee_init\r\n");
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if(getStatus(XBEE_NOT_INITD) != XBEE_NOT_INITD) {
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return WL_ERROR_INIT_ALREADY_INITD;
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} |
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|
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// set status
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setStatus(XBEE_NOT_INITD,XBEE_COMMAND_NONE); |
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|
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// clear last packet buffer
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for(int i=0;i<NUM_LAST_PACKETS;i++) |
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lastPacket[i].source = lastPacket[i].framenum = 0;
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|
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// Set startup baud rate of 9600
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// Set frame format: 8data, 1stop bit, asynchronous normal mode
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// Enable receiver and transmitter and the receiving interrupt
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#ifdef FIREFLY
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UBRR0H = 0x00;
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UBRR0L = 103;
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UCSR0A |= (1<<U2X0);
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UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01); |
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UCSR0B |= (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE); |
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#else
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// Bayboard or robot
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UBRR1H = 0x00; // baud rate |
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UBRR1L = 103; // baud rate |
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UCSR1A |= (1<<U2X1); // double transmit speed |
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//Enable receiver and transmitter on USART1
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UCSR1B |= (1<<RXEN1)|(1<<TXEN1); |
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|
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// Set frame format: 8data, 1stop bit, asynchronous normal mode
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UCSR1C |= (1<<UCSZ10) | (1<<UCSZ11); |
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|
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UCSR1B |= (1<<RXCIE1); // enable receive, transmit (1<<RXCIE) |
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#endif
|
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sei(); |
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|
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// enter command mode
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WL_DEBUG_PRINT_P("entering command mode\r\n");
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xbee_send_string((uint8_t*)"+++");
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xbee_wait_for_ok(); |
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WL_DEBUG_PRINT_P("entered command mode\r\n");
|
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|
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|
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// set baud on xbee
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#if (XBEE_BAUD == 115200) |
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xbee_send_string((uint8_t*)"ATBD7\r");
|
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#elif (XBEE_BAUD == 57600) |
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xbee_send_string((uint8_t*)"ATBD6\r");
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#elif (XBEE_BAUD == 38400) |
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xbee_send_string((uint8_t*)"ATBD5\r");
|
472 |
#elif (XBEE_BAUD == 19200) |
473 |
xbee_send_string((uint8_t*)"ATBD4\r");
|
474 |
#elif (XBEE_BAUD == 9600) |
475 |
// already at this baud rate
|
476 |
xbee_send_string("ATBD3\r\n");
|
477 |
#else
|
478 |
WL_DEBUG_PRINT_P("undefined baud rate\r\n");
|
479 |
return WL_ERROR_BAUD;
|
480 |
#endif
|
481 |
// exit command mode
|
482 |
xbee_wait_for_ok(); |
483 |
WL_DEBUG_PRINT_P("got ok from baud reset\r\n");
|
484 |
xbee_send_string((uint8_t*)"ATCN\r");
|
485 |
xbee_wait_for_ok(); |
486 |
WL_DEBUG_PRINT_P("got ok from exiting command mode\r\n");
|
487 |
|
488 |
// set UART baud
|
489 |
#ifdef FIREFLY
|
490 |
#if (XBEE_BAUD == 115200) |
491 |
UBRR0H = 0x00;
|
492 |
UBRR0L = 8;
|
493 |
#elif (XBEE_BAUD == 57600) |
494 |
UBRR0H = 0x00;
|
495 |
UBRR0L = 16;
|
496 |
#elif (XBEE_BAUD == 38400) |
497 |
UBRR0H = 0x00;
|
498 |
UBRR0L = 25;
|
499 |
#elif (XBEE_BAUD == 19200) |
500 |
UBRR0H = 0x00;
|
501 |
UBRR0L = 51;
|
502 |
#elif (XBEE_BAUD == 9600) |
503 |
/* this is the default baud rate, so do nothing
|
504 |
UBRR0H = 0x00;
|
505 |
UBRR0L = 103;*/
|
506 |
#else
|
507 |
WL_DEBUG_PRINT_P("undefined baud rate\r\n");
|
508 |
return WL_ERROR_BUAD;
|
509 |
#endif
|
510 |
#else // Bayboard or robot |
511 |
#if (XBEE_BAUD == 115200) |
512 |
UBRR1H = 0x00;
|
513 |
UBRR1L = 8;
|
514 |
#elif (XBEE_BAUD == 57600) |
515 |
UBRR1H = 0x00;
|
516 |
UBRR1L = 16;
|
517 |
#elif (XBEE_BAUD == 38400) |
518 |
UBRR1H = 0x00;
|
519 |
UBRR1L = 25;
|
520 |
#elif (XBEE_BAUD == 19200) |
521 |
UBRR1H = 0x00;
|
522 |
UBRR1L = 51;
|
523 |
#elif (XBEE_BAUD == 9600) |
524 |
/* this is the default baud rate, so do nothing
|
525 |
UBRR1H = 0x00;
|
526 |
UBRR1L = 103;*/
|
527 |
#else
|
528 |
WL_DEBUG_PRINT_P("undefined baud rate\r\n");
|
529 |
return WL_ERROR_BUAD;
|
530 |
#endif
|
531 |
#endif
|
532 |
// wait half second for the baud change to stabalize
|
533 |
delay_ms(500);
|
534 |
|
535 |
// enter command mode
|
536 |
WL_DEBUG_PRINT_P("entering command mode 2\r\n");
|
537 |
xbee_send_string((uint8_t*)"+++");
|
538 |
xbee_wait_for_ok(); |
539 |
WL_DEBUG_PRINT_P("entered command mode 2\r\n");
|
540 |
|
541 |
if (xbee_enter_api_mode() != 0) { |
542 |
WL_DEBUG_PRINT_P("can't enter api mode\r\n");
|
543 |
return -1; |
544 |
} |
545 |
|
546 |
#ifdef WL_DEBUG
|
547 |
if (getStatus(XBEE_API_MASK) == XBEE_API_OFF) {
|
548 |
WL_DEBUG_PRINT_P("|API OFF|");
|
549 |
} else if (getStatus(XBEE_API_MASK) == XBEE_API_ON) { |
550 |
WL_DEBUG_PRINT_P("|API ON|");
|
551 |
} else {
|
552 |
WL_DEBUG_PRINT_P("|API ERROR|");
|
553 |
} |
554 |
#endif
|
555 |
|
556 |
// set MY address
|
557 |
uint8_t newmy = (uint8_t)get_robotid(); |
558 |
if (newmy == 0xFF) { |
559 |
WL_DEBUG_PRINT_P("can't get MY address from EEPROM\r\n");
|
560 |
} else {
|
561 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
562 |
if (xbee_send_modify_at_command((uint8_t*)"MY",&newmy,1) != WL_SUCCESS) { |
563 |
WL_DEBUG_PRINT_P("setting MY address failed\r\n");
|
564 |
} |
565 |
// wait for up to 30 ms
|
566 |
newmy = 0;
|
567 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && newmy++ < 10000) { |
568 |
delay_us(1); // wait 3us |
569 |
} |
570 |
if (newmy < 1000 && xbee_command[0] == 'M' && xbee_command[1] == 'Y') { |
571 |
WL_DEBUG_PRINT_P("setting MY address successful\r\n");
|
572 |
} else
|
573 |
WL_DEBUG_PRINT_P("setting MY address failed\r\n");
|
574 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
575 |
} |
576 |
|
577 |
// get MY address
|
578 |
uint16_t address = xbee_get_address(); |
579 |
if (address == WL_ERROR_XBEE_COMMAND_16BIT) {
|
580 |
WL_DEBUG_PRINT_P("getting MY address failed\r\n");
|
581 |
} |
582 |
WL_DEBUG_PRINT_P("MY address:");
|
583 |
WL_DEBUG_PRINT_HEX((uint8_t)(address>>8));
|
584 |
WL_DEBUG_PRINT_HEX((uint8_t)(address&0xFF));
|
585 |
WL_DEBUG_PRINT_P("\r\n");
|
586 |
|
587 |
// set PAN
|
588 |
xbee_set_pan(0);
|
589 |
|
590 |
return WL_SUCCESS;
|
591 |
} |
592 |
|
593 |
/**
|
594 |
* Call when finished using the XBee library.
|
595 |
**/
|
596 |
int8_t xbee_terminate() |
597 |
{ |
598 |
int ret=xbee_exit_api_mode();
|
599 |
if (ret != WL_SUCCESS) {
|
600 |
WL_DEBUG_PRINT_P("xbee termination failed\r\n");
|
601 |
WL_DEBUG_PRINT_INT(ret); |
602 |
WL_DEBUG_PRINT_P("|\r\n");
|
603 |
return WL_ERROR_TERMINATION_FAILED;
|
604 |
} |
605 |
delay_ms(1000);
|
606 |
// reset baud to defaults
|
607 |
xbee_enter_command_mode(); |
608 |
xbee_send_string((uint8_t*)"ATBD 3\r");
|
609 |
xbee_wait_for_ok(); |
610 |
xbee_exit_command_mode(); |
611 |
UBRR1H = 0x00;
|
612 |
UBRR1L = 103;
|
613 |
setStatus(XBEE_NOT_INITD,XBEE_NOT_INITD); // clean initd status
|
614 |
return WL_SUCCESS;
|
615 |
} |
616 |
|
617 |
/**
|
618 |
* Sends a character to the XBee.
|
619 |
*
|
620 |
* @param c the byte to send
|
621 |
* @return 0 for success, nonzero for failure
|
622 |
**/
|
623 |
int8_t xbee_putc(uint8_t c) { |
624 |
|
625 |
// Wait until buffer is clear for sending
|
626 |
// Then load buffer with your character
|
627 |
|
628 |
/*WL_DEBUG_PRINT_P("xbee_putc:");
|
629 |
WL_DEBUG_PRINT_HEX(c);
|
630 |
WL_DEBUG_PRINT_P("|\r\n");*/
|
631 |
|
632 |
#ifdef FIREFLY
|
633 |
loop_until_bit_is_set(UCSR0A, UDRE0); |
634 |
UDR0 = c; |
635 |
#else
|
636 |
loop_until_bit_is_set(UCSR1A, UDRE1); |
637 |
UDR1 = c; |
638 |
#endif
|
639 |
|
640 |
return WL_SUCCESS;
|
641 |
} |
642 |
|
643 |
/**
|
644 |
* Returns the first byte in the buffer received from xbee.
|
645 |
* This function blocks execution until a character has been
|
646 |
* received. xbee_init must be called before this function
|
647 |
* may be used.
|
648 |
*
|
649 |
* @return the first character in the xbee buffer, -1 on error
|
650 |
*
|
651 |
* @see xbee_init, xbee_getc_nb
|
652 |
**/
|
653 |
int16_t xbee_getc(void) {
|
654 |
|
655 |
// Wait for the receive buffer to be filled
|
656 |
// Then read the receive buffer
|
657 |
#ifdef FIREFLY
|
658 |
loop_until_bit_is_set(UCSR0A, RXC0); |
659 |
return UDR0;
|
660 |
#else
|
661 |
loop_until_bit_is_set(UCSR1A, RXC1); |
662 |
return UDR1;
|
663 |
#endif
|
664 |
} |
665 |
|
666 |
/**
|
667 |
* Non blocking version of xbee_getc. If a byte is present in the buffer,
|
668 |
* it is returned, otherwise -1 is returned immediately. xbee_init
|
669 |
* must be called before this function can be used.
|
670 |
*
|
671 |
* @param c The received byte. This will be set if a byte has been received.
|
672 |
*
|
673 |
* @return -1 If no byte is available, 0 otherwise, positive for error
|
674 |
*
|
675 |
* @see xbee_getc
|
676 |
**/
|
677 |
int8_t xbee_getc_nb(uint8_t *c) { |
678 |
|
679 |
// check if the receive buffer is filled
|
680 |
#ifdef FIREFLY
|
681 |
if (UCSR0A & (1<<RXC0)) { |
682 |
(*c) = UDR0; |
683 |
#else
|
684 |
if (UCSR1A & (1<<RXC1)) { |
685 |
(*c) = UDR1; |
686 |
#endif
|
687 |
return WL_SUCCESS;
|
688 |
} |
689 |
return -1; // Return empty |
690 |
} |
691 |
|
692 |
/**
|
693 |
* Send a buffer buf of size bytes to the XBee.
|
694 |
*
|
695 |
* @param buf the buffer of data to send
|
696 |
* @param size the number of bytes to send
|
697 |
**/
|
698 |
int8_t xbee_send(uint8_t* buf, uint16_t size) |
699 |
{ |
700 |
uint16_t i=0; // check if we need this variable |
701 |
while(i<size) {
|
702 |
if (xbee_putc(buf[i++]) != WL_SUCCESS)
|
703 |
return WL_ERROR_SEND;
|
704 |
} |
705 |
|
706 |
return WL_SUCCESS;
|
707 |
} |
708 |
|
709 |
/**
|
710 |
* Sends a string to the XBee.
|
711 |
*
|
712 |
* @param c the string to send to the XBEE
|
713 |
**/
|
714 |
static int8_t xbee_send_string(uint8_t* c)
|
715 |
{ |
716 |
return xbee_send(c, strlen((char*)c)); |
717 |
} |
718 |
|
719 |
|
720 |
/**
|
721 |
* Enter into command mode.
|
722 |
**/
|
723 |
static int8_t xbee_enter_command_mode(void) |
724 |
{ |
725 |
if (xbee_send_string((uint8_t*)"+++") != WL_SUCCESS) { |
726 |
return WL_ERROR_XBEE_COMMAND;
|
727 |
} |
728 |
WL_DEBUG_PRINT_P("sent command +++|");
|
729 |
|
730 |
if (xbee_wait_for_ok() != WL_SUCCESS) {
|
731 |
return WL_ERROR_XBEE_COMMAND;
|
732 |
} |
733 |
WL_DEBUG_PRINT_P("got OK\r\n");
|
734 |
|
735 |
return WL_SUCCESS;
|
736 |
} |
737 |
|
738 |
/**
|
739 |
* Exit from command mode.
|
740 |
**/
|
741 |
static int8_t xbee_exit_command_mode()
|
742 |
{ |
743 |
if (xbee_send_string((uint8_t*)"ATCN\r") != 0) { |
744 |
return WL_ERROR_SEND;
|
745 |
} |
746 |
if (xbee_wait_for_ok() != WL_SUCCESS) {
|
747 |
WL_DEBUG_PRINT_P("failed to exit command mode\r\n");
|
748 |
return WL_ERROR_SEND;
|
749 |
} |
750 |
|
751 |
return WL_SUCCESS;
|
752 |
} |
753 |
|
754 |
/**
|
755 |
* Enter API mode.
|
756 |
**/
|
757 |
static int8_t xbee_enter_api_mode(void) { |
758 |
if (xbee_send_string((uint8_t*)"ATAP 1\r") != 0) { |
759 |
return WL_ERROR_SEND;
|
760 |
} |
761 |
if (xbee_wait_for_ok() != WL_SUCCESS) {
|
762 |
WL_DEBUG_PRINT_P("failed to enter API mode\r\n");
|
763 |
return WL_ERROR_SEND;
|
764 |
} |
765 |
if (xbee_exit_command_mode() != WL_SUCCESS) {
|
766 |
WL_DEBUG_PRINT_P("failed to enter API mode\r\n");
|
767 |
return WL_ERROR_SEND;
|
768 |
} |
769 |
WL_DEBUG_PRINT_P("got OK after entering API mode\r\n");
|
770 |
|
771 |
setStatus(XBEE_API_MASK,XBEE_API_ON); // set status
|
772 |
|
773 |
return WL_SUCCESS;
|
774 |
} |
775 |
|
776 |
/**
|
777 |
* Enter API mode 2.
|
778 |
**/
|
779 |
static int8_t xbee_enter_api_mode2(void) { |
780 |
if (xbee_send_string((uint8_t*)"ATAP 2\r") != 0) { |
781 |
return WL_ERROR_SEND;
|
782 |
} |
783 |
if (xbee_wait_for_ok() != WL_SUCCESS) {
|
784 |
WL_DEBUG_PRINT_P("failed to enter API mode2\r\n");
|
785 |
return WL_ERROR_SEND;
|
786 |
} |
787 |
if (xbee_exit_command_mode() != WL_SUCCESS) {
|
788 |
WL_DEBUG_PRINT_P("failed to enter API mode2\r\n");
|
789 |
return WL_ERROR_SEND;
|
790 |
} |
791 |
WL_DEBUG_PRINT_P("got OK after entering API mode2\r\n");
|
792 |
|
793 |
setStatus(XBEE_API_MASK,XBEE_API_ESCAPE); // set status
|
794 |
|
795 |
return WL_SUCCESS;
|
796 |
} |
797 |
|
798 |
/**
|
799 |
* Exit API mode.
|
800 |
**/
|
801 |
static int8_t xbee_exit_api_mode()
|
802 |
{ |
803 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
804 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
805 |
return WL_ERROR_XBEE_COMMAND; // can't do command right now |
806 |
WL_DEBUG_PRINT_P("now exiting API mode\r\n");
|
807 |
|
808 |
int16_t i=0;
|
809 |
// change status to command wait
|
810 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
811 |
if (xbee_send_modify_at_command((uint8_t*)"AP",(uint8_t*)(&i),1) != WL_SUCCESS) { // send command |
812 |
WL_DEBUG_PRINT_P("error sending AP 0 command\r\n");
|
813 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
814 |
return WL_ERROR_XBEE_COMMAND;
|
815 |
} |
816 |
// wait for up to 30 ms
|
817 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
818 |
delay_us(1); // wait 3us |
819 |
} |
820 |
if (i < 1000 && xbee_command[0] == 'A' && xbee_command[1] == 'P') { |
821 |
WL_DEBUG_PRINT_P("done exiting API mode\r\n");
|
822 |
i = WL_SUCCESS; |
823 |
} else {
|
824 |
WL_DEBUG_PRINT_P("failed to exit API mode\r\n");
|
825 |
i = WL_ERROR_XBEE_COMMAND; // set error code
|
826 |
} |
827 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
828 |
setStatus(XBEE_API_MASK,XBEE_API_OFF); |
829 |
|
830 |
return (int8_t)i; // return |
831 |
} |
832 |
|
833 |
/**
|
834 |
* Wait until the string "OK\r" is received from the XBee.
|
835 |
**/
|
836 |
static int8_t xbee_wait_for_ok()
|
837 |
{ |
838 |
//delay_ms(1000);
|
839 |
//return WL_SUCCESS;
|
840 |
return xbee_wait_for_string((uint8_t*)"OK", 2); |
841 |
} |
842 |
|
843 |
/**
|
844 |
* Delay until the specified string is received from
|
845 |
* the XBee.
|
846 |
*
|
847 |
* Only works when not in API mode
|
848 |
*
|
849 |
* @param s the string to receive
|
850 |
* @param len the length of the string
|
851 |
**/
|
852 |
static int8_t xbee_wait_for_string(uint8_t* s, uint16_t len)
|
853 |
{ |
854 |
uint8_t i=0;
|
855 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); // set status flag
|
856 |
if (getStatus(XBEE_API_MASK) == XBEE_API_OFF) {
|
857 |
// wait until the response is received (only wait 1 second)
|
858 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 1000) { |
859 |
delay_us(1);
|
860 |
} |
861 |
// check response
|
862 |
if (i >= 1000 || memcmp(s,xbee_basic_buf,len) != 0) { |
863 |
// bad response
|
864 |
WL_DEBUG_PRINT_P("Bad response when waiting for string ");
|
865 |
WL_DEBUG_PRINT(s); |
866 |
WL_DEBUG_PRINT_P("\r\n");
|
867 |
return -1; |
868 |
} |
869 |
|
870 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // clear status
|
871 |
} |
872 |
|
873 |
WL_DEBUG_PRINT_P("done waiting for string.\r\n");
|
874 |
|
875 |
return 0; |
876 |
} |
877 |
|
878 |
/**
|
879 |
* Delay until we receive a command response.
|
880 |
* Then copy the response to S and set the len
|
881 |
*
|
882 |
* Only works when not in API mode
|
883 |
*
|
884 |
* @param s the string to store the response in
|
885 |
* @param len the length of the string
|
886 |
*/
|
887 |
static int8_t xbee_wait_for_response(uint8_t* s, int16_t len) {
|
888 |
uint8_t i=0;
|
889 |
if (getStatus(XBEE_API_MASK) == XBEE_API_OFF) {
|
890 |
// wait until the response is received (only wait 1 second)
|
891 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 1000) { |
892 |
delay_us(1);
|
893 |
} |
894 |
// check response
|
895 |
if (i >= 1000) { |
896 |
return -1; |
897 |
} else {
|
898 |
i=strcspn((char*)xbee_basic_buf,"\r"); |
899 |
if (i<PACKET_BUFFER_SIZE) {
|
900 |
memcpy(s,xbee_basic_buf,i); |
901 |
len = i; |
902 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // clear response
|
903 |
return 0; |
904 |
} |
905 |
else
|
906 |
return -1; |
907 |
} |
908 |
} |
909 |
// TODO: do something for API mode
|
910 |
|
911 |
return 0; |
912 |
} |
913 |
|
914 |
/** TODO: since we don't use this, do we need it?
|
915 |
*
|
916 |
* Verifies that the packets checksum is correct.
|
917 |
* (If the checksum is correct, the sum of the bytes
|
918 |
* is 0xFF.)
|
919 |
*
|
920 |
* @param packet the packet received. This includes the first
|
921 |
* three bytes, which are header information from the XBee.
|
922 |
*
|
923 |
* @param len The length of the packet received from the XBee
|
924 |
*
|
925 |
* @return 0 if the checksum is incorrect, nonzero
|
926 |
* otherwise
|
927 |
**/
|
928 |
int8_t xbee_verify_checksum(uint8_t* packet, uint16_t len) |
929 |
{ |
930 |
uint8_t sum = 0;
|
931 |
while(--len > 0) { |
932 |
sum += packet[len]; |
933 |
} |
934 |
sum += packet[0];
|
935 |
return (sum == 0xFF); |
936 |
} |
937 |
|
938 |
/**
|
939 |
* Returns the checksum of the given packet.
|
940 |
*
|
941 |
* @param buf the data for the packet to send
|
942 |
* @param len the length of the packet in bytes
|
943 |
*
|
944 |
* @return the checksum of the packet, which will
|
945 |
* become the last byte sent in the packet
|
946 |
**/
|
947 |
uint8_t xbee_compute_checksum(uint8_t* buf, uint16_t len) |
948 |
{ |
949 |
uint8_t sum = 0;
|
950 |
while(--len > 0) { |
951 |
sum += buf[len]; |
952 |
} |
953 |
sum += buf[0];
|
954 |
return 0xFF - sum; |
955 |
} |
956 |
|
957 |
/**
|
958 |
* Adds buf to the previous checksum total
|
959 |
*
|
960 |
* @param buf a byte buffer to add to the checksum
|
961 |
* @param len the length of the buffer
|
962 |
* @param sum the previous sum
|
963 |
*
|
964 |
* @return error code
|
965 |
**/
|
966 |
int8_t xbee_checksum_add(uint8_t *buf, uint8_t len, uint8_t* sum) { |
967 |
if (buf == NULL || sum == NULL) |
968 |
return WL_ERROR_ARGUMENT;
|
969 |
while(--len > 0) { |
970 |
*sum += buf[len]; |
971 |
} |
972 |
*sum += buf[0];
|
973 |
return WL_SUCCESS;
|
974 |
} |
975 |
|
976 |
|
977 |
/**
|
978 |
* Sends header information. Header information includes
|
979 |
* XBEE_FRAME_START and the packet length, as two bytes.
|
980 |
*
|
981 |
* @param type the packet type
|
982 |
* @param len the size in bytes of the packet data
|
983 |
*
|
984 |
**/
|
985 |
int8_t xbee_send_header(uint16_t len) |
986 |
{ |
987 |
//packet prefix
|
988 |
if (xbee_putc(XBEE_FRAME_START) != WL_SUCCESS)
|
989 |
return WL_ERROR_SEND;
|
990 |
if (xbee_putc((uint8_t)((len & 0xFF00) >> 8)) != WL_SUCCESS) |
991 |
return WL_ERROR_SEND;
|
992 |
if (xbee_putc((uint8_t)(len & 0x00FF)) != WL_SUCCESS) |
993 |
return WL_ERROR_SEND;
|
994 |
|
995 |
return WL_SUCCESS;
|
996 |
} |
997 |
|
998 |
/**
|
999 |
* Adds header information and checksum to the given
|
1000 |
* packet and sends it. Header information includes
|
1001 |
* XBEE_FRAME_START and the packet length, as two bytes.
|
1002 |
*
|
1003 |
* @param buf the packet data
|
1004 |
* @param len the size in bytes of the packet data
|
1005 |
*
|
1006 |
**/
|
1007 |
static int8_t xbee_send_frame(uint8_t* buf, uint16_t len)
|
1008 |
{ |
1009 |
uint8_t checksum = xbee_compute_checksum(buf, len); |
1010 |
|
1011 |
//packet prefix
|
1012 |
if (xbee_putc(XBEE_FRAME_START) != WL_SUCCESS)
|
1013 |
return WL_ERROR_SEND;
|
1014 |
if (xbee_putc((uint8_t)(len>>8)) != WL_SUCCESS) |
1015 |
return WL_ERROR_SEND;
|
1016 |
if (xbee_putc((uint8_t)(len&0xFF)) != WL_SUCCESS) |
1017 |
return WL_ERROR_SEND;
|
1018 |
|
1019 |
if (xbee_send(buf, len) != WL_SUCCESS)
|
1020 |
return WL_ERROR_SEND;
|
1021 |
|
1022 |
if (xbee_putc(checksum) != WL_SUCCESS)
|
1023 |
return WL_ERROR_SEND;
|
1024 |
|
1025 |
return WL_SUCCESS;
|
1026 |
} |
1027 |
|
1028 |
/**
|
1029 |
* Sends an AT command to read a parameter.
|
1030 |
*
|
1031 |
* @param command the AT command to send. For exmaple,
|
1032 |
* use ID to read the PAN ID and MY to return the XBee ID.
|
1033 |
* See the XBee reference guide for a complete listing.
|
1034 |
**/
|
1035 |
int8_t xbee_send_read_at_command(uint8_t* command) |
1036 |
{ |
1037 |
return xbee_send_modify_at_command(command, NULL, 0); |
1038 |
} |
1039 |
|
1040 |
/**
|
1041 |
* Sends the given AT command.
|
1042 |
*
|
1043 |
* @param command the AT command to send (e.g., MY, ID)
|
1044 |
* @param value the value to pass as a parameter
|
1045 |
* (or NULL if there is no parameter)
|
1046 |
**/
|
1047 |
static int8_t xbee_send_modify_at_command(uint8_t* command, uint8_t* value, uint8_t len)
|
1048 |
{ |
1049 |
uint8_t buf[12];
|
1050 |
|
1051 |
buf[0] = XBEE_FRAME_AT_COMMAND;
|
1052 |
buf[1] = 1; |
1053 |
buf[2] = command[0]; |
1054 |
buf[3] = command[1]; |
1055 |
if (value != NULL) |
1056 |
{ |
1057 |
if (len > 8) |
1058 |
{ |
1059 |
WL_DEBUG_PRINT_P("AT Command too large.\r\n");
|
1060 |
return WL_ERROR_ARGUMENT;
|
1061 |
} |
1062 |
memcpy(buf+4,value,len);
|
1063 |
} |
1064 |
|
1065 |
return xbee_send_frame(buf, 4 + len); |
1066 |
} |
1067 |
|
1068 |
/**
|
1069 |
* Send the specified packet.
|
1070 |
*
|
1071 |
* @param packet the packet data to send
|
1072 |
* @param len the number of bytes in the packet
|
1073 |
*
|
1074 |
* @param dest the ID of the XBee to send the packet to,
|
1075 |
* or XBEE_BROADCAST to send the message to all robots
|
1076 |
* in the PAN.
|
1077 |
*
|
1078 |
* @param options a combination of the flags
|
1079 |
* XBEE_OPTIONS_NONE, XBEE_OPTIONS_DISABLE_RESPONSE and
|
1080 |
* XBEE_OPTIONS_BROADCAST_ALL_PANS
|
1081 |
*
|
1082 |
* @param frame the frame number to associate this packet
|
1083 |
* with. This will be used to identify the response when
|
1084 |
* the XBee alerts us as to whether or not our message
|
1085 |
* was received.
|
1086 |
**/
|
1087 |
int8_t xbee_send_packet(uint8_t* packet, uint8_t len, uint16_t dest, uint8_t options, uint8_t frame) |
1088 |
{ |
1089 |
uint8_t sum = XBEE_FRAME_TX_REQUEST_16; |
1090 |
uint8_t i = 0;
|
1091 |
|
1092 |
if (len > 100) |
1093 |
{ |
1094 |
WL_DEBUG_PRINT_P("Packet is too large.\r\n");
|
1095 |
return WL_ERROR_ARGUMENT;
|
1096 |
} |
1097 |
|
1098 |
// calculate checksum
|
1099 |
for(;i<len;i++)
|
1100 |
sum += packet[len]; |
1101 |
sum += frame; |
1102 |
sum += (dest&0xFF00) >> 8; |
1103 |
sum += dest&0x00FF;
|
1104 |
sum += options; |
1105 |
sum = 0xFF - sum;
|
1106 |
|
1107 |
//packet prefix
|
1108 |
if (xbee_putc(XBEE_FRAME_START) != WL_SUCCESS)
|
1109 |
return WL_ERROR_SEND;
|
1110 |
if (xbee_putc(0x00) != WL_SUCCESS) |
1111 |
return WL_ERROR_SEND;
|
1112 |
if (xbee_putc(len+5) != WL_SUCCESS) |
1113 |
return WL_ERROR_SEND;
|
1114 |
|
1115 |
//send header for TX request
|
1116 |
if (xbee_putc(XBEE_FRAME_TX_REQUEST_16) != WL_SUCCESS)
|
1117 |
return WL_ERROR_SEND;
|
1118 |
if (xbee_putc(frame) != WL_SUCCESS)
|
1119 |
return WL_ERROR_SEND;
|
1120 |
if (xbee_putc((uint8_t)((dest&0xFF00) >> 8)) != WL_SUCCESS) |
1121 |
return WL_ERROR_SEND;
|
1122 |
if (xbee_putc((uint8_t)(dest&0x00FF)) != WL_SUCCESS) |
1123 |
return WL_ERROR_SEND;
|
1124 |
if (xbee_putc(options) != WL_SUCCESS)
|
1125 |
return WL_ERROR_SEND;
|
1126 |
|
1127 |
// send packet
|
1128 |
if (xbee_send(packet, len) != WL_SUCCESS)
|
1129 |
return WL_ERROR_SEND;
|
1130 |
|
1131 |
// send checksum
|
1132 |
if (xbee_putc(sum) != WL_SUCCESS)
|
1133 |
return WL_ERROR_SEND;
|
1134 |
|
1135 |
return WL_SUCCESS;
|
1136 |
} |
1137 |
|
1138 |
/**
|
1139 |
* Handles modem status packets.
|
1140 |
*
|
1141 |
* @param status the type of status packet received.
|
1142 |
**/
|
1143 |
void xbee_handle_status(uint8_t status)
|
1144 |
{ |
1145 |
switch (status)
|
1146 |
{ |
1147 |
case 0: |
1148 |
WL_DEBUG_PRINT_P("XBee hardware reset.\r\n");
|
1149 |
break;
|
1150 |
case 1: |
1151 |
WL_DEBUG_PRINT_P("Watchdog timer reset.\r\n");
|
1152 |
break;
|
1153 |
case 2: |
1154 |
WL_DEBUG_PRINT_P("Associated.\r\n");
|
1155 |
break;
|
1156 |
case 3: |
1157 |
WL_DEBUG_PRINT_P("Disassociated.\r\n");
|
1158 |
break;
|
1159 |
case 4: |
1160 |
WL_DEBUG_PRINT_P("Synchronization lost.\r\n");
|
1161 |
break;
|
1162 |
case 5: |
1163 |
WL_DEBUG_PRINT_P("Coordinator realignment.\r\n");
|
1164 |
break;
|
1165 |
case 6: |
1166 |
WL_DEBUG_PRINT_P("Coordinator started.\r\n");
|
1167 |
break;
|
1168 |
} |
1169 |
} |
1170 |
|
1171 |
/**
|
1172 |
* Handles AT command response packets.
|
1173 |
* @param command the two character AT command, e.g. MY or ID
|
1174 |
* @param result 0 for success, 1 for an error
|
1175 |
* @param len the length in bytes of extra
|
1176 |
**/
|
1177 |
static int8_t xbee_handle_at_command_response(uint16_t command, uint8_t status, uint8_t len)
|
1178 |
{ |
1179 |
WL_DEBUG_PRINT_P("HANDLE AT COMMAND\r\n");
|
1180 |
if (status != 0) |
1181 |
{ |
1182 |
WL_DEBUG_PRINT_P("Error with AT");
|
1183 |
WL_DEBUG_PRINT(command); |
1184 |
WL_DEBUG_PRINT_P(" packet. Result = ");
|
1185 |
switch(status) {
|
1186 |
case 1: |
1187 |
WL_DEBUG_PRINT_P("ERROR\r\n");
|
1188 |
break;
|
1189 |
case 2: |
1190 |
WL_DEBUG_PRINT_P("Invalid Command\r\n");
|
1191 |
break;
|
1192 |
case 3: |
1193 |
WL_DEBUG_PRINT_P("Invalid Parameter\r\n");
|
1194 |
break;
|
1195 |
} |
1196 |
return WL_SUCCESS;
|
1197 |
} |
1198 |
WL_DEBUG_PRINT_P("AT");
|
1199 |
WL_DEBUG_PRINT_CHAR((uint8_t)(command>>8));
|
1200 |
WL_DEBUG_PRINT_CHAR((uint8_t)(command)); |
1201 |
WL_DEBUG_PRINT_P(" command is being handled\r\n");
|
1202 |
|
1203 |
// TODO: program more command responses here (ND, etc)
|
1204 |
switch(command) {
|
1205 |
case ('I'<<8)+'D': // PAN |
1206 |
case ('C'<<8)+'H': // channel |
1207 |
case ('M'<<8)+'Y': // address |
1208 |
case ('A'<<8)+'P': // api mode |
1209 |
// copy command to handler
|
1210 |
xbee_command[0] = (command&0xFF00)>>8; |
1211 |
xbee_command[1] = command&0x00FF; |
1212 |
uint8_t ptr = basic_buf_last; |
1213 |
for(command=2;command<len+2;command++) { |
1214 |
xbee_command[command] = xbee_basic_buf_get(&ptr); |
1215 |
if (xbee_command[command] == '\r') |
1216 |
break; // done with command |
1217 |
WL_DEBUG_PRINT_HEX(xbee_command[command]); |
1218 |
} |
1219 |
xbee_command[command] = '\0';
|
1220 |
WL_DEBUG_PRINT_P("len=");
|
1221 |
WL_DEBUG_PRINT_INT(len); |
1222 |
WL_DEBUG_PRINT_P("ID,CH,or MY command result:");
|
1223 |
WL_DEBUG_PRINT(xbee_command); |
1224 |
WL_DEBUG_PRINT_P("\r\n");
|
1225 |
break;
|
1226 |
default:
|
1227 |
WL_DEBUG_PRINT_P("unknown AT command");
|
1228 |
} |
1229 |
|
1230 |
// signal handler that command response is done
|
1231 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_RESPONSE); |
1232 |
|
1233 |
return WL_SUCCESS;
|
1234 |
} |
1235 |
|
1236 |
/**
|
1237 |
* Sets the personal area network id.
|
1238 |
*
|
1239 |
* @param id the new personal area network (PAN) id
|
1240 |
**/
|
1241 |
int8_t xbee_set_pan(uint16_t id) |
1242 |
{ |
1243 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
1244 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
1245 |
return WL_ERROR_XBEE_COMMAND; // can't do command right now |
1246 |
|
1247 |
int16_t i=(id&0xFF)|(id>>8); |
1248 |
// change status to command wait
|
1249 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
1250 |
xbee_send_modify_at_command((uint8_t*)"ID",(uint8_t*)(&i),2); // send command to set the channel |
1251 |
// wait for up to 30 ms
|
1252 |
i=0;
|
1253 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
1254 |
delay_us(1); // wait 3us |
1255 |
} |
1256 |
if (i < 1000 && xbee_command[0] == 'I' && xbee_command[1] == 'D') |
1257 |
i = WL_SUCCESS; |
1258 |
else
|
1259 |
i = WL_ERROR_XBEE_COMMAND; // set error code
|
1260 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
1261 |
return (int8_t)i; // return |
1262 |
} |
1263 |
|
1264 |
/**
|
1265 |
* Get the PAN ID for the XBee.
|
1266 |
*
|
1267 |
* @return the personal area network id, or
|
1268 |
* XBEE_PAN_DEFAULT if it has not yet been set.
|
1269 |
**/
|
1270 |
uint16_t xbee_get_pan() |
1271 |
{ |
1272 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
1273 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
1274 |
return WL_ERROR_XBEE_COMMAND_16BIT; // can't do command right now |
1275 |
|
1276 |
uint16_t i=0;
|
1277 |
// change status to command wait
|
1278 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
1279 |
xbee_send_read_at_command((uint8_t*)"ID"); // send command to get the PAN |
1280 |
// wait for up to 30 ms
|
1281 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
1282 |
delay_us(1); // wait 3us |
1283 |
} |
1284 |
if (i < 1000 && xbee_command[0] == 'I' && xbee_command[1] == 'D') |
1285 |
i = (xbee_command[2]<<8)|xbee_command[3]; // do ntoh16 coversion |
1286 |
else
|
1287 |
i = WL_ERROR_XBEE_COMMAND_16BIT; // set error code
|
1288 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
1289 |
return i; // return |
1290 |
} |
1291 |
|
1292 |
/**
|
1293 |
* Set the channel the XBee is using.
|
1294 |
*
|
1295 |
* @param channel the channel the XBee will not use,
|
1296 |
* between 0x0B and 0x1A
|
1297 |
*
|
1298 |
* @see xbee_get_channel
|
1299 |
**/
|
1300 |
int8_t xbee_set_channel(uint8_t channel) |
1301 |
{ |
1302 |
if (channel < 0x0B || channel > 0x1A) |
1303 |
{ |
1304 |
WL_DEBUG_PRINT_P("Channel out of range.\r\n");
|
1305 |
return WL_ERROR_ARGUMENT;
|
1306 |
} |
1307 |
|
1308 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
1309 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
1310 |
return WL_ERROR_XBEE_COMMAND; // can't do command right now |
1311 |
|
1312 |
int16_t i=0;
|
1313 |
// change status to command wait
|
1314 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
1315 |
xbee_send_modify_at_command((uint8_t*)"CH",&channel,1); // send command to set the channel |
1316 |
// wait for up to 30 ms
|
1317 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
1318 |
delay_us(1); // wait 3us |
1319 |
} |
1320 |
if (i < 1000 && xbee_command[0] == 'C' && xbee_command[1] == 'H') |
1321 |
i = WL_SUCCESS; |
1322 |
else
|
1323 |
i = WL_ERROR_XBEE_COMMAND; // set error code
|
1324 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
1325 |
return (int8_t)i; // return |
1326 |
} |
1327 |
|
1328 |
/**
|
1329 |
* Returns the channel which the XBee is currently using.
|
1330 |
*
|
1331 |
* @return the channel the XBee is using
|
1332 |
*
|
1333 |
* @see xbee_set_channel
|
1334 |
**/
|
1335 |
int8_t xbee_get_channel(void)
|
1336 |
{ |
1337 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
1338 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
1339 |
return WL_ERROR_XBEE_COMMAND; // can't do command right now |
1340 |
|
1341 |
int16_t i=0;
|
1342 |
// change status to command wait
|
1343 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
1344 |
xbee_send_read_at_command((uint8_t*)"CH"); // send command to get the channel |
1345 |
// wait for up to 30 ms
|
1346 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
1347 |
delay_us(1); // wait 3us |
1348 |
} |
1349 |
if (i < 1000 && xbee_command[0] == 'C' && xbee_command[1] == 'H') |
1350 |
i = (int8_t)xbee_command[2]; // get channel |
1351 |
else
|
1352 |
i = WL_ERROR_XBEE_COMMAND; // set error code
|
1353 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
1354 |
return i; // return |
1355 |
} |
1356 |
|
1357 |
/**
|
1358 |
* Get the 16-bit address of the XBee.
|
1359 |
* This is used to specify who to send messages to
|
1360 |
* and who messages are from.
|
1361 |
*
|
1362 |
* @return the 16-bit address of the XBee.
|
1363 |
**/
|
1364 |
uint16_t xbee_get_address(void)
|
1365 |
{ |
1366 |
if (getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_WAIT
|
1367 |
|| getStatus(XBEE_COMMAND_MASK) == XBEE_COMMAND_RESPONSE) |
1368 |
return WL_ERROR_XBEE_COMMAND_16BIT; // can't do command right now |
1369 |
|
1370 |
uint16_t i=0;
|
1371 |
// change status to command wait
|
1372 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_WAIT); |
1373 |
xbee_send_read_at_command((uint8_t*)"MY"); // send command to get the address |
1374 |
// wait for up to 30 ms
|
1375 |
while(getStatus(XBEE_COMMAND_MASK) != XBEE_COMMAND_RESPONSE && i++ < 10000) { |
1376 |
delay_us(1); // wait 3us |
1377 |
} |
1378 |
|
1379 |
if (i < 1000 && xbee_command[0] == 'M' && xbee_command[1] == 'Y') { |
1380 |
i = (xbee_command[2]<<8)|xbee_command[3]; // do ntoh16 coversion |
1381 |
} else
|
1382 |
i = WL_ERROR_XBEE_COMMAND_16BIT; // set error code
|
1383 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // reset status
|
1384 |
WL_DEBUG_PRINT_P("get MY address\r\n");
|
1385 |
return i; // return |
1386 |
} |
1387 |
|
1388 |
/**@} **/ // end xbee group |
1389 |
|