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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <wiringPi.h> | |
| int main(void) { | |
| int errorno = wiringPiSetupGpio(); | |
| // No newline, so I missed this a few times | |
| // debugging when it was the line above and this line only | |
| // it gets instered before the prompt when the program finishes. | |
| printf("Plpo"); | |
| if( errorno != -1 ) { | |
| // doesn't print because errorno is zero, but printf("error: %d", errorno); will | |
| // because you included text in it. So this does work | |
| printf("%d", errorno); | |
| pinMode(4, OUTPUT); // These functions take BCM GPIO pins http://wiringpi.com/pins/ | |
| for(;;) { | |
| digitalWrite(4, HIGH); // This needs to be 4 as well and same for the one below | |
| delay(500); | |
| digitalWrite(4, LOW); | |
| delay(500); | |
| } | |
| } else { | |
| printf("An error occured while initializing the GPIO"); | |
| } | |
| return 0; | |
| } |
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Turns out the issue was the pin numbers which is terribly confusing from what is documented as it refers to wiringPi pins but uses the BCM GPIO pin numbers (http://wiringpi.com/pins/).