raspi

README.md

@@ -5,9 +5,16 @@ IRMC stands for Internet Relay Morse Code and is an implementation of [MOIP](htt
 # Building 
 ## On Linux
 sudo apt-get install -y alsa-oss oss-compat build-essential autoconf libao-dev libtool libportaudio-dev portaudio19-dev
+make 
+
+### On Raspi (GPIO Interface)
+Follow: http://wiringpi.com/download-and-install/
+make raspi
+
 
 ## On OSX
 brew install portaudio
+make
 
 # Hardware interface options
 A good description on how to build different interfaces (telegraph key, sounder or both) 

src/Makefile

@@ -21,6 +21,10 @@ irmc:   ${OBJ}
 	@echo CC -o $@
 	@${CC} -o $@ ${OBJ} ${LDFLAGS}
 
+raspi:	
+	@${CC} -c -DRASPI ${CFLAGS} ${SRC}
+	@${CC} -o irmc ${OBJ} ${LDFLAGS} -lwiringPi
+
 java:
 	java -jar test/MorseKOB.jar 
 

src/beep.c

@@ -6,7 +6,11 @@
 
 #include "beep.h"
 
+#ifdef RASPI
 #define RASPI_AUDIO_LATENCY_FIX (30./5.) // https://app.assembla.com/spaces/portaudio/tickets/246-paex_sine-choppy-on-raspberry-pi---defaultlowoutputlatency-too-low/details
+#else
+#define RASPI_AUDIO_LATENCY_FIX (1.)
+#endif
  
 // http://stackoverflow.com/questions/7678470/generating-sound-of-a-particular-frequency-using-gcc-in-ubuntu
 

src/cwprotocol.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <sys/socket.h>
+
 #include "cwprotocol.h"
 
 /* Global variables */
@@ -41,7 +42,7 @@ int prepare_tx (struct data_packet_format *tx_packet, char *id)
 	tx_packet->a21 = 0; /* These magic numbers was provided by Les Kerr */
 	tx_packet->a22 = 755;
 	tx_packet->a23 = 16777215;
-	snprintf(tx_packet->status, SIZE_STATUS, "?");
+	snprintf(tx_packet->status, SIZE_STATUS, "?"); // this shall include the sent character
 	
 	return 0;
 }

src/irmc.c

@@ -16,14 +16,19 @@
 #include <signal.h>
 #include <arpa/inet.h>
 
-//#define DEBUG 1
-
 #define MAXDATASIZE 1024 // max number of bytes we can get at once 
 
 #include "cwprotocol.h"
 #include "beep.h"
 #include "util.h"
 
+// http://raspberrypiguide.de/howtos/raspberry-pi-gpio-how-to/
+#ifdef RASPI
+#include <wiringPi.h>
+#define TX_RASPI_PIN 5
+#endif
+
+
 int serial_status = 0, fd_serial, numbytes;
 
 double tx_timeout = 0;
@@ -34,8 +39,9 @@ long tx_timer = 0;
 
 /* TX Methods */
 #define TX_NONE 0
-#define TX_SERIAL 1
-#define TX_KEYBOARD 2
+//#define TX_SERIAL 1
+//#define TX_KEYBOARD 2 // not implemented yet
+#define TX_RASPI 3
 
 long key_press_t1;
 long key_release_t1;
@@ -52,7 +58,9 @@ void inthandler(int sig)
 	signal(sig, SIG_IGN);
 	send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);	
 	close(fd_socket);
+#ifdef TX_SERIAL
 	close(fd_serial);
+#endif
 	exit(1);
 }
 
@@ -65,18 +73,32 @@ void txloop (void)
 		tx_data_packet.code[tx_data_packet.n - 1] = 
 			(int) ((key_press_t1 - key_release_t1) * -1);
 
-		//printf("space: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+#ifdef DEBUG
+		printf("space: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+#endif
+#ifdef TX_SERIAL
 		while(serial_status & TIOCM_DSR) ioctl(fd_serial, TIOCMGET, &serial_status);
+#endif
+#ifdef RASPI
+		while(digitalRead(TX_RASPI_PIN)==1) { }
+#endif
 		key_release_t1 = fastclock();
 
 		tx_data_packet.n++;	
 		tx_data_packet.code[tx_data_packet.n - 1] =
 			(int) ((key_release_t1 - key_press_t1) * 1);
-		
-		//printf("mark: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+
+#ifdef DEBUG		
+		printf("mark: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+#endif
 		while(1){
+#ifdef TX_SERIAL
 			ioctl(fd_serial, TIOCMGET, &serial_status);
 			if(serial_status & TIOCM_DSR) break;
+#endif
+#ifdef RASPI
+			if(digitalRead(TX_RASPI_PIN)==1) break;
+#endif
 			tx_timeout = fastclock() - key_release_t1;
 			if(tx_timeout > TX_TIMEOUT) return;
 		}
@@ -133,7 +155,6 @@ int main(int argc, char *argv[])
 	int channel;
 	char id[SIZE_ID];
 	char serialport[64];
-	int tx_method = TX_NONE;
 
 	// Set default values
 	snprintf(hostname, 64, "mtc-kob.dyndns.org");
@@ -224,21 +245,30 @@ int main(int argc, char *argv[])
 	inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
 			s, sizeof s);
 	fprintf(stderr, "Connected to %s.\n", s);
-	beep_init();
-	if ((strcmp (serialport, "")) != 0) 
-		tx_method = TX_SERIAL; 
 
-	if (tx_method == TX_SERIAL) {
-		fd_serial = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
-		if(fd_serial == -1) {
-    			fprintf(stderr,"Unable to open serial port %s.\n", serialport);
-    		}
+#ifdef TX_SERIAL
+	fd_serial = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
+	if(fd_serial == -1) {
+    		fprintf(stderr,"Unable to open serial port %s.\n", serialport);
+    	}
+#endif
+
+#ifdef RASPI
+	if (wiringPiSetup() == -1)
+	{
+    		fprintf(stderr,"Unable to setup wiringPi for PIN %d\n", TX_RASPI_PIN);
+		exit (1);
 	}
+	pinMode(TX_RASPI_PIN, INPUT);
+#endif
+ 
 	freeaddrinfo(servinfo); /* all done with this structure */
 
 	key_release_t1 = fastclock();
 	identifyclient();
-    
+   
+	beep_init();
+
 	/* Main Loop */
 	for(;;) {
   		if(tx_timer == 0) 
@@ -306,14 +336,22 @@ int main(int argc, char *argv[])
 		#endif
 			tx_data_packet.n = 0;
 		}
-		if (tx_method == TX_SERIAL) {
-			ioctl(fd_serial,TIOCMGET, &serial_status);
-			if(serial_status & TIOCM_DSR){
-				txloop();
-				tx_timer = TX_WAIT;
-				message(1);
-			}
+#ifdef TX_SERIAL
+		ioctl(fd_serial,TIOCMGET, &serial_status);
+		if(serial_status & TIOCM_DSR){
+			txloop();
+			tx_timer = TX_WAIT;
+			message(1);
 		}
+#endif
+
+#ifdef RASPI
+		if(digitalRead(5)==1){
+			txloop();
+			tx_timer = TX_WAIT;
+			message(1);
+		}
+#endif
 		
 		if(keepalive_t < 0 && tx_timer == 0){
 		#if DEBUG
@@ -334,7 +372,9 @@ int main(int argc, char *argv[])
 
 	send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);	
 	close(fd_socket);
+#ifdef TX_SERIAL
 	close(fd_serial);
+#endif
 	buzzer_stop();
 
 	exit(0);