Carrier detect LED written in C for speed.

aprs_utils/carrier_detect/carrier_detect_led.c

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+#include <pigpio.h>
+#include <stdio.h>
+
+#define DCD_LED 17
+
+int main()
+{
+	if (gpioInitialise() < 0)
+	{
+	   // pigpio initialisation failed.
+	   printf("pigpio failed");
+	}
+	else
+	{
+	   // pigpio initialised okay.
+	   gpioSetMode(DCD_LED, PI_OUTPUT); // Set DCD_LED as output
+	   gpioWrite(DCD_LED, 1); // Set DCD_LED high
+	   gpioSleep(PI_TIME_RELATIVE, 1, 0);     // sleep for one second
+	   gpioWrite(DCD_LED, 0); // Set DCD_LED low
+	   gpioTerminate();
+	}
+}

aprs_utils/carrier_detect/howto-compile.txt

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+gcc -Wall -pthread -o prog dcd.c -lpigpio -lrt