Flipdot-display/src/esp32/main.cpp

// ESP32 firmware: decides what the flipdot display shows (clock, bitmaps, web UI, Home
// Assistant) and sends it to the Nano, which drives the panels. See README.md.
// The objects and the actions on them are in app.cpp; this file only sets the order.

#include <Arduino.h>

#include "app.h"
#include "config.h"
#include "display/bitmap_store.h"
#include "display/icon_store.h"
#include "display/page_store.h"
#include "logic/status_led.h"
#include "nano_link/nano_flash_bridge.h"
#include "net/ha_api.h"
#include "net/home_assistant.h"
#include "net/wifi_ota.h"
#include "system/boot_target.h"
#include "system/firmware_guard.h"
#include "web/web_ui.h"

// Flashing the Nano over WiFi: restart it into its bootloader, switch it off afterwards.
// The controller then powers it on again with the new firmware.
NanoFlashBridge flashBridge(
	NANO_FLASH_PORT, Serial2,
	[](uint32_t baud) { nano.startBootloader(baud); },
	[]() { nano.off(); });

void setup()
{
	Serial.begin(115200);
	pinMode(LED_PIN, OUTPUT);
	nano.begin(); // display off until something is shown

	// Decided first, before anything that could crash
	BootMode boot_mode = firmwareGuardBegin();

	bitmapStoreBegin();
	iconStoreBegin(); // the Pikachus as icons that can be edited
	pageStoreBegin(); // the Clock page as a page that can be edited
	appLoadSettings();

	if (boot_mode == BootMode::Normal)
		status.show("Connecting", "to WiFi...", true);
	wifiBegin(); // starts the recovery app when it fails
	otaBegin();

	if (boot_mode == BootMode::SafeMode)
	{
		// Crashed too often: the recovery app, or without it only WiFi and OTA here,
		// then try the main code once more
		firmwareGuardSafeModeEnded();
		rebootToRecovery(RecoveryReason::Crash);
		status.show("Crashed 3x", "OTA only");
		otaOnlyMode(SAFE_MODE_TIME, LED_PIN);
		ESP.restart();
	}
	if (boot_mode == BootMode::PanicWindow)
	{
		status.show("Crashed!", "OTA open 15s");
		otaOnlyMode(OTA_PANIC_WINDOW, LED_PIN);
	}

	flashBridge.begin();

	// Shown until the time is synced over NTP
	status.show("Getting", "the time...", true);

	configTzTime(TIMEZONE, NTP_SERVER);
	haApiBegin(); // Home Assistant values are read in a task of their own
	homeAssistantBegin(controller, appSettings().home_assistant);
	webUiBegin();

	firmwareGuardStartWatchdog();
}

void loop()
{
	// OTA and the firmware guard come first, so they keep working whatever happens below
	otaLoop();
	firmwareGuardLoop(wifiConnected());
	loopStats.tick(micros());
	wifiWatchdog();

	homeAssistantSetFirmwareStatus(firmwareGuardStatus());
	homeAssistantLoop();
	webUiLoop();
	appLoop();
	// Once the firmware can't be rolled back anymore (the old one doesn't know icons)
	if (!firmwareGuardPending())
		appMigrateIcons();
	// Home Assistant values of the shown page (read by a task, never blocks)
	if (haApiLoop(wifiConnected()))
		controller.pageChanged();

	// While the Nano is being flashed, nothing else may talk to it
	if (flashBridge.handle())
		return;
	status.loop(); // changed flip settings, once the display is on

	LocalTime now;
	bool time_valid = appLocalTime(now);
	appPageLoop(time_valid, now);
	controller.update(millis(), time_valid, now, wifiConnected());
	// Checks the frames just sent; a wrong image on the Nano (and every resync interval):
	// the whole image again with the next update
	if (nanoMonitor.loop(millis(), appSettings().refresh.image * 60000UL))
		controller.pageChanged();

	bool led = appSettings().status_led && statusLedLevel(millis(), wifiConnected(), nano.isOn());
	digitalWrite(LED_PIN, led);
}