Flipdot-display/src/esp32/main.cpp

// ESP32 firmware: decides what the flipdot display shows (clock, Home Assistant switches)
// and sends it to the Nano, which drives the panels. See README.md.

#include <Arduino.h>
#include <time.h>

#include "BROSE9323.h"
#include "config.h"
#include "display/frames.h"
#include "logic/display_controller.h"
#include "logic/status_led.h"
#include "nano_link/nano_flash_bridge.h"
#include "nano_link/nano_link.h"
#include "net/home_assistant.h"
#include "net/wifi_ota.h"
#include "system/boot_target.h"
#include "system/firmware_guard.h"

NanoLink nano(Serial2, NANO_RX_PIN, NANO_TX_PIN, RELAY_PIN, NANO_RESET_PIN);
BROSE9323 display(DISPLAY_WIDTH, DISPLAY_HEIGHT, PANEL_WIDTH);
FlipdotFrames frames(display);
DisplayController controller(nano, frames);

// 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 the main code runs

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

	wifiBegin();
	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);
		otaOnlyMode(SAFE_MODE_TIME, LED_PIN);
		ESP.restart();
	}
	if (boot_mode == BootMode::PanicWindow)
		otaOnlyMode(OTA_PANIC_WINDOW, LED_PIN);

	flashBridge.begin();

	nano.on();
	display.begin(&nano.stream());
	display.setTiming(FLIP_TIME);
	// Shown until the time is synced
	frames.message("Connecting...");

	configTzTime(TIMEZONE, NTP_SERVER);
	homeAssistantBegin(controller);

	firmwareGuardStartWatchdog();
}

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

	homeAssistantSetFirmwareStatus(firmwareGuardStatus());
	homeAssistantLoop();

	// While the Nano is being flashed, nothing else may talk to it
	if (flashBridge.handle())
		return;

	struct tm now = {};
	bool time_valid = getLocalTime(&now, 0);
	controller.update(millis(), time_valid, now.tm_hour, now.tm_min);

	digitalWrite(LED_PIN, statusLedLevel(millis(), wifiConnected(), nano.isOn()));
}