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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 "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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|
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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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/*WL_DEBUG_PRINT("in interrupt|status=");
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WL_DEBUG_PRINT_HEX(xbee_status);
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WL_DEBUG_PRINT("|frame_start=");
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WL_DEBUG_PRINT_HEX(apitype);
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if (getStatus(XBEE_API_MASK) == XBEE_API_OFF) {
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WL_DEBUG_PRINT("|API OFF");
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} else if (getStatus(XBEE_API_MASK) == XBEE_API_ON) {
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WL_DEBUG_PRINT("|API ON");
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} else {
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WL_DEBUG_PRINT("|API ERROR");
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}*/
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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("|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("got packet, len=");
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WL_DEBUG_PRINT_INT(i); |
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WL_DEBUG_PRINT("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("return\r\n");
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return;
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} |
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//WL_DEBUG_PRINT("|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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//WL_DEBUG_PRINT("|len_hi");
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} else if (i==1) { |
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len |= PORT; |
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//WL_DEBUG_PRINT("|len_lo");
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} else if (i==2) { |
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apitype = PORT; |
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//WL_DEBUG_PRINT("|GOT APITYPE");
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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("i=");
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WL_DEBUG_PRINT_INT(i); |
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WL_DEBUG_PRINT("|len=");
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WL_DEBUG_PRINT_INT(len); |
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WL_DEBUG_PRINT("|status:");
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WL_DEBUG_PRINT_INT(apitype); |
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WL_DEBUG_PRINT("|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("|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("|\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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break; }
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case XBEE_FRAME_RX_64: {
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// receive a packet with 64bit address
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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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break; }
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default:
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WL_DEBUG_PRINT("|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("|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("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("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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// test interrupt
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/*ISR(USART1_RX_vect) {
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WL_DEBUG_PRINT("in interrupt|");
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char c = UDR1;
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WL_DEBUG_PRINT_HEX(c);
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WL_DEBUG_PRINT("|in interrupt");
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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("in xbee_init\r\n");
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|
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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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// 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("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("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) |
480 |
xbee_send_string((uint8_t*)"ATBD7\r");
|
481 |
#elif (XBEE_BAUD == 57600) |
482 |
xbee_send_string((uint8_t*)"ATBD6\r");
|
483 |
#elif (XBEE_BAUD == 38400) |
484 |
xbee_send_string((uint8_t*)"ATBD5\r");
|
485 |
#elif (XBEE_BAUD == 19200) |
486 |
xbee_send_string((uint8_t*)"ATBD4\r");
|
487 |
#elif (XBEE_BAUD == 9600) |
488 |
// already at this baud rate
|
489 |
xbee_send_string("ATBD3\r\n");
|
490 |
#else
|
491 |
WL_DEBUG_PRINT("undefined baud rate\r\n");
|
492 |
return WL_ERROR_BAUD;
|
493 |
#endif
|
494 |
// exit command mode
|
495 |
xbee_wait_for_ok(); |
496 |
WL_DEBUG_PRINT("got ok from baud reset\r\n");
|
497 |
xbee_send_string((uint8_t*)"ATCN\r");
|
498 |
xbee_wait_for_ok(); |
499 |
WL_DEBUG_PRINT("got ok from exiting command mode\r\n");
|
500 |
|
501 |
// set UART baud
|
502 |
#ifdef FIREFLY
|
503 |
#if (XBEE_BAUD == 115200) |
504 |
UBRR0H = 0x00;
|
505 |
UBRR0L = 8;
|
506 |
#elif (XBEE_BAUD == 57600) |
507 |
UBRR0H = 0x00;
|
508 |
UBRR0L = 16;
|
509 |
#elif (XBEE_BAUD == 38400) |
510 |
UBRR0H = 0x00;
|
511 |
UBRR0L = 25;
|
512 |
#elif (XBEE_BAUD == 19200) |
513 |
UBRR0H = 0x00;
|
514 |
UBRR0L = 51;
|
515 |
#elif (XBEE_BAUD == 9600) |
516 |
/* this is the default baud rate, so do nothing
|
517 |
UBRR0H = 0x00;
|
518 |
UBRR0L = 103;*/
|
519 |
#else
|
520 |
WL_DEBUG_PRINT("undefined baud rate\r\n");
|
521 |
return WL_ERROR_BUAD;
|
522 |
#endif
|
523 |
#else // Bayboard or robot |
524 |
#if (XBEE_BAUD == 115200) |
525 |
UBRR1H = 0x00;
|
526 |
UBRR1L = 8;
|
527 |
#elif (XBEE_BAUD == 57600) |
528 |
UBRR1H = 0x00;
|
529 |
UBRR1L = 16;
|
530 |
#elif (XBEE_BAUD == 38400) |
531 |
UBRR1H = 0x00;
|
532 |
UBRR1L = 25;
|
533 |
#elif (XBEE_BAUD == 19200) |
534 |
UBRR1H = 0x00;
|
535 |
UBRR1L = 51;
|
536 |
#elif (XBEE_BAUD == 9600) |
537 |
/* this is the default baud rate, so do nothing
|
538 |
UBRR1H = 0x00;
|
539 |
UBRR1L = 103;*/
|
540 |
#else
|
541 |
WL_DEBUG_PRINT("undefined baud rate\r\n");
|
542 |
return WL_ERROR_BUAD;
|
543 |
#endif
|
544 |
#endif
|
545 |
// wait half second for the baud change to stabalize
|
546 |
delay_ms(500);
|
547 |
|
548 |
// enter command mode
|
549 |
WL_DEBUG_PRINT("entering command mode 2\r\n");
|
550 |
xbee_send_string((uint8_t*)"+++");
|
551 |
xbee_wait_for_ok(); |
552 |
WL_DEBUG_PRINT("entered command mode 2\r\n");
|
553 |
|
554 |
if (xbee_enter_api_mode() != 0) { |
555 |
WL_DEBUG_PRINT("can't enter api mode\r\n");
|
556 |
return -1; |
557 |
} |
558 |
/*xbee_send_string((uint8_t*)"ATAP 1\r");
|
559 |
xbee_wait_for_ok();*/
|
560 |
|
561 |
/*WL_DEBUG_PRINT("Entered api mode.\r\n");
|
562 |
|
563 |
if (xbee_exit_command_mode() != 0) {
|
564 |
WL_DEBUG_PRINT("can't exit command mode\r\n");
|
565 |
return -1;
|
566 |
}
|
567 |
setStatus(XBEE_COMMAND_MASK,XBEE_COMMAND_NONE); // clear status
|
568 |
|
569 |
WL_DEBUG_PRINT("Left command mode.\r\n");
|
570 |
|
571 |
WL_DEBUG_PRINT("before status=");
|
572 |
WL_DEBUG_PRINT_HEX(getStatus(0xFF));
|
573 |
WL_DEBUG_PRINT("\r\n");
|
574 |
|
575 |
setStatus(XBEE_API_MASK,XBEE_API_O |