root / trunk / code / projects / libwireless / lib / wireless.c @ 17
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#include "wireless.h" |
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#include "xbee.h" |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include "wl_defs.h" |
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#ifndef ROBOT
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#include <time.h> |
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#include <signal.h> |
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#else
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#include <time.h> |
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#include <bom.h> |
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#endif
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/*Function Prototypes*/
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void wl_do_timeout(void); |
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//Note: the actual frame sent has group as the first four bits and
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//frame as the last four.
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void wl_send_packet(char group, char type, char* data, int len, |
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int dest, char options, char frame); |
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/*Data Members*/
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//used to store incoming and outgoing packets
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unsigned char wl_buf[128]; |
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//1 if we have timed out since we last checked, 0 otherwise.
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int wl_timeout = 0; |
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PacketGroupHandler* wl_packet_groups[WL_MAX_PACKET_GROUPS]; |
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#ifndef ROBOT
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timer_t wl_timeout_timer; |
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//called when we time out, or receive interrupt
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void sig_handler(int signo) |
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{ |
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switch (signo)
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{ |
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case SIGALRM:
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wl_timeout = 1;
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break;
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case SIGINT:
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wl_terminate(); |
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exit(1);
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break;
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} |
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return;
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} |
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#endif
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/**
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* Initializes the wireless library. Must be called before any
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* other function.
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**/
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void wl_init()
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{ |
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int i;
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for (i = 0; i < WL_MAX_PACKET_GROUPS; i++) |
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wl_packet_groups[i] = NULL;
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xbee_lib_init(WL_DEFAULT_PAN); |
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//begin timeout timer
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#ifdef ROBOT
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rtc_init(HALF_SECOND, &wl_do_timeout); |
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#else
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//create a timer to trigger every half second
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struct sigevent evp;
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evp.sigev_signo = SIGALRM; |
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evp.sigev_notify = SIGEV_SIGNAL; |
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if (timer_create(CLOCK_REALTIME, &evp, &wl_timeout_timer) == -1) |
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{ |
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WL_DEBUG_PRINT("Error creating a timer.\r\n");
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exit(1);
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} |
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struct sigaction wl_sig_act;
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wl_sig_act.sa_handler = (void *)sig_handler;
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wl_sig_act.sa_flags = 0;
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sigemptyset(&wl_sig_act.sa_mask); |
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sigaction(SIGALRM, &wl_sig_act, 0);
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sigaction(SIGINT, &wl_sig_act, 0);
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struct itimerspec wl_timeout_time;
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wl_timeout_time.it_interval.tv_sec = 0;
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wl_timeout_time.it_interval.tv_nsec = 500000000;
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wl_timeout_time.it_value.tv_sec = 0;
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wl_timeout_time.it_value.tv_nsec = 500000000;
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timer_settime(wl_timeout_timer, 0,
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&wl_timeout_time, NULL);
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#endif
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} |
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/**
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* Uninitializes the wireless library.
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**/
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void wl_terminate()
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{ |
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#ifndef ROBOT
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timer_delete(wl_timeout_timer); |
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#endif
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int i;
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for (i = 0; i < WL_MAX_PACKET_GROUPS; i++) |
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if (wl_packet_groups[i] != NULL && |
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wl_packet_groups[i]->unregister != NULL)
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wl_packet_groups[i]->unregister(); |
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xbee_terminate(); |
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} |
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/**
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* Returns the 16-bit address of the XBee module.
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*
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* @return the 16-bit address of the XBee module.
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**/
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unsigned int wl_get_xbee_id() |
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{ |
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return xbee_get_address();
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} |
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/**
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* Send a packet to a specific XBee without specifying a PAN.
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*
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* @param group the packet group
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* @param type the packet type
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* @param data the packet data
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* @param len the packet length in bytes
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* @param dest the 16-bit address of the XBee to send the packet to
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* @param frame the frame number to see with a TX_STATUS response
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**/
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void wl_send_robot_to_robot_global_packet(char group, char type, |
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char* data, int len, int dest, char frame) |
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{ |
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wl_send_packet(group, type, data, len, dest, |
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XBEE_OPTIONS_BROADCAST_ALL_PANS, frame); |
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} |
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/**
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* Send a packet to a specific XBee in the same PAN.
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*
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* @param group the packet group
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* @param type the packet type
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* @param data the packet data
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* @param len the packet length in bytes
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* @param dest the 16-bit address of the XBee to send the packet to
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* @param frame the frame number to see with a TX_STATUS response
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**/
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void wl_send_robot_to_robot_packet(char group, char type, |
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char* data, int len, int dest, char frame) |
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{ |
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wl_send_packet(group, type, data, len, dest, XBEE_OPTIONS_NONE, |
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frame); |
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} |
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/**
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* Send a packet to all XBees in all PANs.
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*
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* @param group the packet group
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* @param type the packet type
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* @param data the packet data
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* @param len the packet length in bytes
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* @param frame the frame number to see with a TX_STATUS response
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**/
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void wl_send_global_packet(char group, char type, |
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char* data, int len, char frame) |
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{ |
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wl_send_packet(group, type, data, len, XBEE_BROADCAST, |
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XBEE_OPTIONS_BROADCAST_ALL_PANS, frame); |
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} |
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/**
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* Send a packet to all XBee's in the same PAN.
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*
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* @param group the packet group
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* @param type the packet type
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* @param data the packet data
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* @param len the packet length in bytes
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* @param frame the frame number to see with a TX_STATUS response
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**/
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void wl_send_pan_packet(char group, char type, |
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char* data, int len, char frame) |
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{ |
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wl_send_packet(group, type, data, len, XBEE_BROADCAST, |
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XBEE_OPTIONS_NONE, frame); |
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} |
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/**
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* Send a packet.
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*
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* @param group the packet group
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* @param type the packet type
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* @param data the packet data
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* @param len the packet length in bytes
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* @param dest the destination of the packet
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* @param options the options for sending the packet
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* @param frame the frame number to see with a TX_STATUS response
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**/
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void wl_send_packet(char group, char type, char* data, int len, |
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int dest, char options, char frame) |
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{ |
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char buf[128]; |
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int i;
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if (frame != 0) |
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frame = (frame & 0x0F) | ((group & 0x0F) << 4); |
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buf[0] = group;
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buf[1] = type;
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for (i = 0; i < len; i++) |
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buf[2 + i] = data[i];
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xbee_send_packet(buf, len + 2, dest, options, frame);
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} |
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/**
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* Register a packet group with the wireless library. The event
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* handlers in the packet group will be called whenever an
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* event dealing with the packet group's group code occurs.
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*
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* @param h the PacketGroupHandler to register
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**/
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void wl_register_packet_group(PacketGroupHandler* h)
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{ |
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if (h->groupCode >= WL_MAX_PACKET_GROUPS)
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{ |
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WL_DEBUG_PRINT("Packet group code too large.\r\n");
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return;
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} |
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if (wl_packet_groups[h->groupCode] != NULL) |
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{ |
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WL_DEBUG_PRINT("Packet group code already registered.\r\n");
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return;
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} |
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wl_packet_groups[h->groupCode] = h; |
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} |
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/**
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* Unregister a packet group from the wireless library.
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*
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* @param h the packet group to remove
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**/
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void wl_unregister_packet_group(PacketGroupHandler* h)
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{ |
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unsigned int groupCode = h->groupCode; |
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PacketGroupHandler* p = wl_packet_groups[groupCode]; |
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if (p != NULL && p->unregister != NULL) |
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p->unregister(); |
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wl_packet_groups[groupCode] = NULL;
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} |
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/**
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* Called when the timer is triggered. This calls the timeout
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* handlers of all the registered packet groups.
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**/
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void wl_do_timeout()
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{ |
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int i;
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for (i = 0; i < WL_MAX_PACKET_GROUPS; i++) |
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if (wl_packet_groups[i] != NULL && |
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wl_packet_groups[i]->timeout_handler != NULL)
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wl_packet_groups[i]->timeout_handler(); |
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} |
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/**
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* Performs wireless library functionality. This function must
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* be called frequently for wireless to perform effectively.
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* This function will call timeout handlers, as well as
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* received packet and transmit status handlers.
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**/
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void wl_do()
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{ |
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if (wl_timeout)
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{ |
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wl_do_timeout(); |
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wl_timeout = 0;
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} |
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int len = xbee_get_packet(wl_buf);
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if (len < 0)//no packet received |
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return;
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if (wl_buf[0] == XBEE_TX_STATUS) |
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{ |
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if (len != 3) |
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{ |
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WL_DEBUG_PRINT("Transmit Status packet should be of length 3.\r\n");
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return;
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} |
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//the first four bits are the packet group
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//this only works with under 16 groups
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int group = (int)(wl_buf[1] >> 4); |
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int success = 0; |
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if (wl_buf[2] == 0) |
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success = 1;
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else
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{ |
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WL_DEBUG_PRINT("No response received.\r\n");
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if (wl_buf[2] == 2) |
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WL_DEBUG_PRINT("CCA Failure\r\n");
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if (wl_buf[2] == 3) |
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WL_DEBUG_PRINT("Purged\r\n");
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} |
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if (wl_packet_groups[group] != NULL && |
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wl_packet_groups[group]->handle_response != NULL)
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wl_packet_groups[group]->handle_response( |
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(int)wl_buf[1] & 0x0F, success); |
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return;
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} |
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if (wl_buf[0] == XBEE_RX) |
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{ |
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if (len < 7) |
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{ |
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WL_DEBUG_PRINT("Packet is too small.\r\n");
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return;
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} |
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int source = ((int)wl_buf[1] << 8) + ((int)wl_buf[2]); |
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/*
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//unused for now
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int signalStrength = wl_buf[3];
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//1 for Address broadcast, 2 for PAN broadcast
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int options = wl_buf[4];
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*/
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int group = wl_buf[5]; |
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int type = wl_buf[6]; |
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int packetLen = len - 7; |
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if (wl_packet_groups[group] != NULL |
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&& wl_packet_groups[group]->handle_receive != NULL)
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wl_packet_groups[group]->handle_receive(type, source, |
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wl_buf + 7, packetLen);
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return;
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} |
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WL_DEBUG_PRINT("Unexpected packet received from XBee.\r\n");
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return;
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} |
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