added sr_frs_present for testing

cubesatsim/cubesatsim.ino

@@ -506,7 +506,7 @@ void transmit_on() {
     if (debug_mode)	  
       Serial.println("Transmit on!!!");
 //  pwm_set_gpio_level(BPSK_PWM_A_PIN, (config.top + 1) * 0.5);
-//  pwm_set_gpio_level(BPSK_PWM_B_PIN, (config.top + 1) * 0.5);	
+//  pwm_set__level(BPSK_PWM_B_PIN, (config.top + 1) * 0.5);	
 /*	  
     int ret = 1;
     int i = 0;	  
@@ -3536,10 +3536,12 @@ void config_gpio() {
   else
     Serial.println("BPF not present - no transmitting after CW ID");	  
 	
-  if (digitalRead(TXC_PIN) == FALSE)
-    Serial.println("TXC present");
+  if (digitalRead(TXC_PIN) == FALSE) {
+    Serial.println("SR_FRS present");
+    sr_frs_present = true;
+  }
   else
-    Serial.println("TXC not present");	
+    Serial.println("SR_FRS not present");	
 
 //  Serial.print("Squelch: ");
 //  Serial.println(digitalRead(SQUELCH));
@@ -3829,6 +3831,7 @@ void transmit_cw(int freq, float duration) {  // freq in Hz, duration in millise
     digitalWrite(LED_BUILTIN, HIGH);	// Transmit LED on
   digitalWrite(MAIN_LED_BLUE, HIGH);	
 
+  if (sr_frs_present) {	
 	  unsigned long start = micros();
 	  unsigned long duration_us = duration * 1000;
 	  float period_us = (0.5E6) / (float)(freq);
@@ -3840,6 +3843,11 @@ void transmit_cw(int freq, float duration) {  // freq in Hz, duration in millise
 	    sleep(min(time_left, period_us) / 1.0E6);  
 	  }
 	  digitalWrite(AUDIO_OUT_PIN, LOW);		  
+  }
+  else {
+    Serial.println("No sr_frs present!");	  
+  }
+
 //  if (!wifi) 
     digitalWrite(LED_BUILTIN, LOW);	// Transmit LED off
   digitalWrite(MAIN_LED_BLUE, LOW);