Ben / moon

/**
 * @file buttons.c
 * ESP32 GPIO button driver
 * Buttons are wired active-low (press connects to GND)
 */

#include "buttons.h"
#include "driver/gpio.h"
#include "../../src/moon.h"

#define PIN_DOWN 39
#define PIN_UP   40
#define PIN_OK   41
#define PIN_BACK 42

void buttons_init(void) {
    gpio_config_t io_conf = {
        .pin_bit_mask = (1ULL << PIN_UP) | (1ULL << PIN_DOWN) |
                        (1ULL << PIN_OK) | (1ULL << PIN_BACK),
        .mode = GPIO_MODE_INPUT,
        .pull_up_en = GPIO_PULLUP_ENABLE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE,
    };
    gpio_config(&io_conf);
}

void buttons_update(void) {
    button_state = 0;

    // Active-low: pressed when GPIO reads 0
    if (gpio_get_level(PIN_UP) == 0) {
        button_state |= BUTTON_STATE_UP;
    }
    if (gpio_get_level(PIN_DOWN) == 0) {
        button_state |= BUTTON_STATE_DOWN;
    }
    if (gpio_get_level(PIN_OK) == 0) {
        button_state |= BUTTON_STATE_OK;
    }
    if (gpio_get_level(PIN_BACK) == 0) {
        button_state |= BUTTON_STATE_BACK;
    }
}