02-usart/src/kern/gpio/sysled.c


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#include "kern/gpio/sysled.h"

#define SYSLED GPIO_PIN_PB3

gpio_reserved_pin_t get_sysled()
{
  if (gpio_pin_in_use(SYSLED)) {
    return (gpio_reserved_pin_t) { .v_ = SYSLED };
  }
  
  int ec;
  gpio_pin_opts_t opts = DEFAULT_GPIO_OPTS_OUTPUT;
  return reserve_gpio_pin(SYSLED, &opts, &ec);
}