2nd step

src/pifmrds/control_pipe.c

@@ -145,6 +145,12 @@ ResultAndArg poll_control_pipe() {
 			printf("\n");
 			resarg.res = CONTROL_PIPE_DEVIATION_SET;
 			resarg.arg = arg;
+		 else if(fifo[0] == 'G' && fifo[1] == 'A' && fifo[2] == 'I') {
+			printf("Set Gain to ");
+			printf(arg);
+			printf("\n");
+			resarg.res = CONTROL_PIPE_GAIN_SET;
+			resarg.arg = arg;
 		} else if(fifo[0] == 'S' && fifo[1] == 'T' && fifo[2] == 'R') {
 			int togg = ( strcmp(arg, "OFF") == 0 );
 			printf("Set Stereo Toggle to ");

src/pifmrds/control_pipe.h

@@ -17,6 +17,7 @@
 #define CONTROL_PIPE_RDS_SET 10
 #define CONTROL_PIPE_DEVIATION_SET 11
 #define CONTROL_PIPE_STEREO_SET 12
+#define CONTROL_PIPE_GAIN_SET 13
 
 typedef struct {
     int res;

src/pifmrds/pi_fm_rds.cpp

@@ -199,6 +199,8 @@ int tx(uint32_t carrier_freq, char *audio_file, uint16_t pi, char *ps, char *rt,
                 deviation_scale_factor=  0.1 * (deviation );
             } else if(pollResult.res == CONTROL_PIPE_STEREO_SET) {
                 disablestereo = (int)pollResult.arg;
+            } else if(pollResult.res == CONTROL_PIPE_GAIN_SET) {
+                gaim = (float)pollResult.arg;
             }
         }