Create display module top level

components/display/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
-  SRCS "display_driver.c"
+  SRCS "display.c" "display_driver.c"
   INCLUDE_DIRS "."
-  REQUIRES driver fatal
+  REQUIRES driver fatal esp_timer time
 )

components/display/display.c

@@ -0,0 +1,107 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#include "display.h"
+
+#include "display_driver.h"
+#include "fatal.h"
+#include "time.h"
+
+#include "esp_log.h"
+#include "esp_timer.h"
+#include <string.h>
+
+#define TAG "Display"
+
+#define DRIVER_TASK_PERIOD_US 4000UL
+#define TIME_UPDATE_PERIOD_US 1000000UL
+
+#define CLAMP(x, lim) ((x) > (lim) ? (lim) : (x))
+
+const DisplayDigitState digit_encodings[10] = {
+	[0] = { true, true, true, true, true, true, false, false },
+	[1] = { false, true, true, false, false, false, false, false },
+	[2] = { true, true, false, true, true, false, true, false },
+	[3] = { true, true, true, true, false, false, true, false },
+	[4] = { false, true, true, false, false, true, true, false },
+	[5] = { true, false, true, true, false, true, true, false },
+	[6] = { true, false, true, true, true, true, true, false },
+	[7] = { true, true, true, false, false, false, false, false },
+	[8] = { true, true, true, true, true, true, true, false },
+	[9] = { true, true, true, false, false, true, true, false },
+};
+
+static void show_digit(DisplayDigit digit, unsigned value)
+{
+	memcpy(
+	    &display_state[digit], digit_encodings[value],
+	    sizeof(DisplayDigitState));
+}
+
+static void show_time(unsigned hour, unsigned minute)
+{
+	if (hour > 99 || minute > 99)
+		ESP_LOGW(TAG, "Un-displayable time: %02u:%02u", hour, minute);
+
+	show_digit(DISPLAY_DIGIT_1, (hour / 10) % 10);
+	show_digit(DISPLAY_DIGIT_2, hour % 10);
+
+	display_state[DISPLAY_DIGIT_2][DISPLAY_SEGMENT_DP] = true;
+
+	show_digit(DISPLAY_DIGIT_3, (minute / 10) % 10);
+	show_digit(DISPLAY_DIGIT_4, minute % 10);
+}
+
+static void update_time(void *arg)
+{
+	(void)arg;
+	const Time time = time_get();
+	show_time(time.hour, time.minute);
+}
+
+void display_init()
+{
+	esp_err_t error;
+
+	display_driver_init();
+
+	esp_timer_handle_t driver_timer;
+	const esp_timer_create_args_t driver_timer_config = {
+		.callback = &display_driver_task,
+		.arg = NULL,
+		.name = "display driver task",
+	};
+	error = esp_timer_create(&driver_timer_config, &driver_timer);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error creating timer for driver task: %04x", error);
+		FATAL();
+	}
+
+	error = esp_timer_start_periodic(driver_timer, DRIVER_TASK_PERIOD_US);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error starting timer for driver task: %04x", error);
+		FATAL();
+	}
+
+	esp_timer_handle_t update_timer;
+	const esp_timer_create_args_t update_timer_config = {
+		.callback = &update_time,
+		.arg = NULL,
+		.name = "display driver task",
+	};
+	error = esp_timer_create(&update_timer_config, &update_timer);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error creating timer for driver task: %04x", error);
+		FATAL();
+	}
+
+	error = esp_timer_start_periodic(update_timer, TIME_UPDATE_PERIOD_US);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error starting timer for driver task: %04x", error);
+		FATAL();
+	}
+
+	update_time(NULL);
+}

components/display/display.h

@@ -0,0 +1,17 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#ifndef DISPLAY_H
+#define DISPLAY_H
+
+/**
+ * Initialize the display.
+ *
+ * This will configure the relevant GPIO pins and start a task that
+ * manages updates to the display.
+ */
+void display_init(void);
+
+#endif

main/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
   SRCS "main.c"
   INCLUDE_DIRS "."
-  REQUIRES config
+  REQUIRES config display
 )

main/main.c

@@ -4,8 +4,10 @@
  */
 
 #include "config.h"
+#include "display.h"
 
 void app_main(void)
 {
 	config_init();
+	display_init();
 }