Create buttons module

Temporarily just logging button presses, as alarms module doesn't yet
exist.

README.md

@@ -10,8 +10,7 @@ Networked bedside clock utilising an ESP32-SOLO-1.
 - [x] Console for configuration
 - [ ] TCP API for configuration
 - [x] SNTP synchronisation
-- [ ] Dismiss button
-- [ ] Snooze button
+- [x] Snooze and dismiss buttons
 - [ ] Multiple alarms
 - [ ] Alarm conditions (e.g. weekday / weekend)
 - [ ] IPv6 support

components/buttons/CMakeLists.txt

@@ -0,0 +1,5 @@
+idf_component_register(
+  SRCS "buttons.c"
+  INCLUDE_DIRS "."
+  REQUIRES driver esp_timer fatal
+)

components/buttons/buttons.c

@@ -0,0 +1,103 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#include "buttons.h"
+
+#include "fatal.h"
+
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "esp_timer.h"
+
+#define TAG "Buttons"
+
+#define PIN_BITMASK(n) ((uint64_t)1 << n)
+
+#define SNOOZE_PIN GPIO_NUM_34
+#define DISMISS_PIN GPIO_NUM_35
+
+#define PRESS_HANDLE_PERIOD_US 300000UL
+
+static bool snooze_pressed;
+static bool dismiss_pressed;
+
+static void handle_snooze_interrupt(void *arg)
+{
+	(void)arg;
+	snooze_pressed = true;
+}
+
+static void handle_dismiss_interrupt(void *arg)
+{
+	(void)arg;
+	dismiss_pressed = true;
+}
+
+static void handle_presses(void *arg)
+{
+	(void)arg;
+	if (snooze_pressed) {
+		ESP_LOGI(TAG, "Snooze pressed");
+		snooze_pressed = false;
+	}
+	if (dismiss_pressed) {
+		ESP_LOGI(TAG, "Dismiss pressed");
+		dismiss_pressed = false;
+	}
+}
+
+void buttons_init()
+{
+	esp_err_t error;
+
+	snooze_pressed = false;
+	dismiss_pressed = false;
+
+	const gpio_config_t pin_config = {
+		.pin_bit_mask = PIN_BITMASK(SNOOZE_PIN) | PIN_BITMASK(DISMISS_PIN),
+		.mode = GPIO_MODE_INPUT,
+		.pull_down_en = GPIO_PULLDOWN_ENABLE,
+		.intr_type = GPIO_INTR_POSEDGE,
+	};
+	error = gpio_config(&pin_config);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error configuring GPIO: %04x", error);
+		FATAL();
+	}
+
+	error = gpio_install_isr_service(0);
+	if (error != ESP_OK) {
+		ESP_LOGE(
+		    TAG, "Error installing GPIO interrupt service: %04x", error);
+		FATAL();
+	}
+	error = gpio_isr_handler_add(SNOOZE_PIN, &handle_snooze_interrupt, NULL);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error adding snooze interrupt handler: %04x", error);
+	}
+	error
+	    = gpio_isr_handler_add(DISMISS_PIN, &handle_dismiss_interrupt, NULL);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error adding snooze interrupt handler: %04x", error);
+		FATAL();
+	}
+
+	const esp_timer_create_args_t timer_config = {
+		.callback = &handle_presses,
+		.name = "Buttons press handler",
+	};
+	esp_timer_handle_t timer;
+	error = esp_timer_create(&timer_config, &timer);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error creating timer: %04x", error);
+		FATAL();
+	}
+
+	error = esp_timer_start_periodic(timer, PRESS_HANDLE_PERIOD_US);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error starting timer: %04x", error);
+		FATAL();
+	}
+}

components/buttons/buttons.h

@@ -0,0 +1,16 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#ifndef BUTTONS_H
+#define BUTTONS_H
+
+typedef void (*ButtonCallback)(void);
+
+/**
+ * Initialize the buttons module.
+ */
+void buttons_init(void);
+
+#endif

main/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
   SRCS "main.c"
   INCLUDE_DIRS "."
-  REQUIRES console_wrapper display settings sound time wifi
+  REQUIRES buttons console_wrapper display settings sound time wifi
 )

main/main.c

@@ -3,6 +3,7 @@
  * Copyright (c) Camden Dixie O'Brien
  */
 
+#include "buttons.h"
 #include "console.h"
 #include "display.h"
 #include "settings.h"
@@ -18,4 +19,5 @@ void app_main(void)
 	wifi_init();
 	time_manager_init();
 	sound_init();
+	buttons_init();
 }