Reboot script via GPIO armbian

ROCK 4 Series
2

I just made a gpio switch doing “halt” system.
Maybe you just change “halt” to “reboot”.
It needs libmraa.

#include <mraa/gpio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

sig_atomic_t volatile run_flag = 1;

void do_when_interrupted(int sig)
{
if (sig ==SIGINT)
run_flag = 0;
}

int main()
{
mraa_gpio_context led, button;
led = mraa_gpio_init(3);
button = mraa_gpio_init(7); //GPIO 7pin is switch for “halt”

mraa_gpio_dir(led, MRAA_GPIO_OUT);
mraa_gpio_dir(button, MRAA_GPIO_IN);

signal(SIGINT, do_when_interrupted);
while(run_flag)
{
int i;
i = mraa_gpio_read(button);

  printf("%d\n", i);
  if(i)         // when switch is on, just turn on and off a led.
  {	
  	mraa_gpio_write(led, 1);
  	sleep(1);
  	mraa_gpio_write(led,0);
  	sleep(1);
  }
  else       //when the switch is off, system halt. 
  	system("halt");   //system("reboot") will reboot the system.

}

mraa_gpio_close(led);
return 0;
}

It’s my first GPIO program.
And I learned it from https://lasr.cs.ucla.edu/classes/edison_tutorials/gpio.pdf.

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