root / trunk / code / projects / colonet / lib / colonet_wireless / colonet_wireless.cpp @ 174
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/** @file colonet_wireless.c
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*
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* @brief Implementation of server-side colonet wireless library
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*
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* @author Eugene Marinelli
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*/
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/********************************* Includes **********************************/
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#include <string> |
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#include <pthread.h> |
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#include <iostream> |
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#include <fstream> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <wireless.h> // Colonet wireless library. |
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#include "colonet_defs.h" |
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#include "colonet_wireless.h" |
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/******************************* Definitions *********************************/
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//Enable debug printouts
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#define DEBUG 1 |
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#ifdef DEBUG
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#define dbg_printf(...) printf(__VA_ARGS__)
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#define dbg_fprintf(...) fprintf(__VA_ARGS__)
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#else
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#define dbg_printf(...)
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#define dbg_fprintf(...)
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#endif
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static MsgHandlerFunction message_handler;
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static bool logging_enabled; |
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static char log_filename[80]; |
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static pthread_t listener_thread;
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static char wl_port[40]; |
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/************************* Internal prototypes *******************************/
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static void* listen(void* args); |
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static void timeout_handler(void); |
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static void handle_response(int frame, int received); |
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static void handle_receive(char type, int source, unsigned char* packet, |
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int len);
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static void unregister(void); |
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static int log_packet(unsigned char* packet, int len); |
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/**************************** Public functions *******************************/
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void colonet_wl_init(char* wl_port_, MsgHandlerFunction message_handler_, |
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char* log_filename_) {
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if (log_filename) {
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logging_enabled = true;
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sprintf(log_filename, log_filename_); |
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} |
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strncpy(wl_port, wl_port_, 40);
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// todo - initialize wireless port
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message_handler = message_handler_; |
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} |
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void colonet_wl_kill_listener_thread() {
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pthread_kill(listener_thread, 9);
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} |
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int colonet_wl_run_listener_thread() {
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dbg_printf("Spawning listener thread...\n");
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if (pthread_create(&listener_thread, NULL, listen, NULL)) { |
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perror("pthread_create");
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return -1; |
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} |
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return 0; |
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} |
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void colonet_wl_send(int client_source, short dest, |
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ColonetMessageType msg_type, unsigned char msg_code, |
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unsigned char* args) { |
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ColonetRobotServerPacket pkt; |
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pkt.client_id = client_source; |
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pkt.msg_code = msg_code; |
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for (int i = 0; i < PACKET_DATA_LEN; i++) { |
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pkt.data[i] = args[i]; |
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} |
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char pkt_buffer[40]; |
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memcpy(pkt_buffer, (char*)(&pkt), sizeof(ColonetRobotServerPacket)); |
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if (dest == GLOBAL_DEST) {
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printf("sending to global dest\n");
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wl_send_global_packet(COLONET_PACKET_GROUP_ID, (char)msg_type, pkt_buffer,
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1 + PACKET_DATA_LEN, 0); |
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} else {
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printf("sending to specific robot.\n");
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wl_send_robot_to_robot_global_packet(COLONET_PACKET_GROUP_ID, (char)msg_type,
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pkt_buffer, 1 + PACKET_DATA_LEN, dest,
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COLONET_RESPONSE_PACKET_FRAME_ID); |
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} |
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} |
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/**************************** Private functions ******************************/
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static void timeout_handler() { |
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printf("timeout!\n");
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} |
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static void handle_response(int frame, int received) { |
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printf("handle response\n");
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} |
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static void handle_receive(char type, int source, unsigned char* packet, |
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int len) {
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ColonetRobotServerPacket pkt; |
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pkt.client_id = packet[0] | (packet[1]<<8) | (packet[2]<<16) | |
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(packet[3]<<24); //little endian |
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memcpy(pkt.data, packet + 5, PACKET_DATA_LEN);
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if (logging_enabled) {
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log_packet(packet, len); |
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} |
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message_handler(type, source, pkt.client_id, packet, len); |
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printf("handle receive\n");
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} |
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static void unregister(void) { |
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printf("unregister\n");
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} |
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/** @brief Analogous to the "SIGNAL" or "ISR" function on the robots.
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* Listens for bytes on the wireless port and constructs packets based on them.
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* Not part of the ColonetWireless class since a function pointer must be
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* passed in starting the thread that runs it (tricky or impossible if it's
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* a class function).
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*
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* @param args Pointer to arguments. Can be safely casted to ListenerArgs type
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* @return NULL
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*/
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static void* listen(void* args) { |
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printf("Called listen.\n");
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wl_init(); |
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printf("wl_init succeeded.\n");
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PacketGroupHandler pgh = {COLONET_PACKET_GROUP_ID, |
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timeout_handler, |
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handle_response, |
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handle_receive, |
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unregister}; |
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wl_register_packet_group(&pgh); |
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while (1) { |
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wl_do(); |
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} |
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wl_terminate(); |
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pthread_exit(NULL);
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return NULL; |
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} |
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/** @brief
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*
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* @param pkt Packet to be logged
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*
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* @return 0 on success, -1 on failure
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*/
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int log_packet(unsigned char* packet, int len) |
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{ |
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FILE* logfile = fopen(log_filename, "a");
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if (logfile == NULL) { |
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dbg_printf("%s: Error - fopen %s failed.\n", log_filename, __FUNCTION__);
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return -1; |
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} |
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for (int i = 0; i < len; i++) { |
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fprintf(logfile, "%d ", *((unsigned char*)packet + i)); |
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} |
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fprintf(logfile, "\n");
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fclose(logfile); |
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return 0; |
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} |