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#include <freertos/FreeRTOS.h>
#include <freertos/timers.h>
#include <esp_log.h>
#include <driver/gpio.h>
#include <driver/adc.h>
#include <hap.h>
#include <hap_apple_servs.h>
#include <hap_apple_chars.h>
#include <intercom.h>
#include <bell.h>
static hap_val_t HAP_PROGRAMMABLE_SWITCH_EVENT_SINGLE_PRESS = {.u = 0};
volatile bool is_intercom_bell_blocked;
static TimerHandle_t intercom_bell_timer; // ignore new bells until timer triggered
static hap_char_t *intercom_bell_current_state;
bool is_bell_ringing(int val)
{
return 2340 < val && val < 2360;
}
void IRAM_ATTR intercom_bell_isr(void *arg)
{
if (is_intercom_bell_blocked)
return;
// TODO: Can ADC1 be read from ISR?
int val = adc1_get_raw(CONFIG_HOMEKIT_INTERCOM_BELL_ADC1_CHANNEL);
if (!is_bell_ringing(val))
return;
// TODO: Can hap function be called from an ISR?
hap_char_update_val(intercom_bell_current_state, &HAP_PROGRAMMABLE_SWITCH_EVENT_SINGLE_PRESS);
is_intercom_bell_blocked = true;
xTimerResetFromISR(intercom_bell_timer, pdFALSE);
}
void intercom_bell_timer_cb(TimerHandle_t timer)
{
ESP_LOGI(TAG, "Intercom bell timer fired");
is_intercom_bell_blocked = false;
}
hap_serv_t *intercom_bell_init(uint32_t key_gpio_pin)
{
is_intercom_bell_blocked = false;
intercom_bell_timer = xTimerCreate("intercom_bell_timer", pdMS_TO_TICKS(CONFIG_HOMEKIT_INTERCOM_LOCK_TIMEOUT), pdFALSE, 0, intercom_bell_timer_cb);
hap_serv_t *intercom_bell_service = hap_serv_doorbell_create(0);
hap_serv_add_char(intercom_bell_service, hap_char_name_create("Intercom Bell"));
intercom_bell_current_state = hap_serv_get_char_by_uuid(intercom_bell_service, HAP_CHAR_UUID_PROGRAMMABLE_SWITCH_EVENT);
gpio_config_t io_conf;
io_conf.intr_type = GPIO_INTR_ANYEDGE; /* Interrupt for rising edge */
io_conf.pin_bit_mask = 1ULL << key_gpio_pin; /* Bit mask of the pins */
io_conf.mode = GPIO_MODE_INPUT; /* Set as input mode */
io_conf.pull_up_en = GPIO_PULLUP_DISABLE; /* Disable internal pull-up */
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE; /* Enable internal pull-down */
gpio_config(&io_conf); /* Set the GPIO configuration */
gpio_install_isr_service(ESP_INTR_FLAG_EDGE | ESP_INTR_FLAG_LOWMED); /* Install gpio isr service */
gpio_isr_handler_add(key_gpio_pin, intercom_bell_isr, (void *)key_gpio_pin); /* Hook isr handler for specified gpio pin */
// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html#_CPPv425adc1_config_channel_atten14adc1_channel_t11adc_atten_t
adc1_config_width(ADC_WIDTH_BIT_12); /* The value read is 12 bits wide (range 0-4095). */
adc1_config_channel_atten(CONFIG_HOMEKIT_INTERCOM_BELL_ADC1_CHANNEL, ADC_ATTEN_DB_11);
return intercom_bell_service;
}
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