STM32F4DoorControl/buttons.c

#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <stdint.h>
#include <stdio.h>
#include "buttons.h"

#define OPEN_RCC RCC_GPIOB
#define OPEN_PORT GPIOB
#define OPEN_BUTTON GPIO9
#define CLOSE_RCC RCC_GPIOC
#define CLOSE_PORT GPIOC
#define CLOSE_BUTTON GPIO3

void buttons_setup() {
  #define SETUP(BTN) \
    rcc_periph_clock_enable(BTN ## _RCC); \
    gpio_mode_setup(BTN ## _PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, BTN ## _BUTTON); \
    gpio_set_output_options(BTN ## _PORT, GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, BTN ## _BUTTON);
  SETUP(OPEN);
  SETUP(CLOSE);
#undef SETUP
  buttons_release();
}

static uint32_t open_ticks = 0;
static uint32_t close_ticks = 0;

void buttons_open(uint32_t ticks) {
  gpio_clear(OPEN_PORT, OPEN_BUTTON);
  printf("Open %lu", ticks);
  open_ticks = ticks;
}

void buttons_close(uint32_t ticks) {
  gpio_clear(CLOSE_PORT, CLOSE_BUTTON);
  printf("Close %lu", ticks);
  close_ticks = ticks;
}

void buttons_release(void) {
  open_ticks = close_ticks = 0;
  printf("Release");
  gpio_set(OPEN_PORT, OPEN_BUTTON);
  gpio_set(CLOSE_PORT, CLOSE_BUTTON);
}

void buttons_tick(void) {
  if (open_ticks) {
    open_ticks--;
    if (!open_ticks) {
      gpio_set(OPEN_PORT, OPEN_BUTTON);
      printf("Release open");
    }
  }
  if (close_ticks) {
    close_ticks--;
    if (!close_ticks) {
      printf("Release close");
      gpio_set(CLOSE_PORT, CLOSE_BUTTON);
    }
  }
}