[beken-72xx] Auto-reboot after detecting download-mode commands

arduino/beken-72xx/cores/arduino/SerialClass.cpp

@@ -24,10 +24,29 @@ SerialClass::SerialClass(uint8_t port) {
 	this->buf  = NULL;
 }
 
+#if LT_AUTO_DOWNLOAD_REBOOT
+static uint8_t adrState		  = 0;
+static const uint8_t adrCmd[] = {0x01, 0xE0, 0xFC, 0x01, 0x00};
+
+static void adrParse(uint8_t c) {
+	// parse and respond to link check command (CMD_LinkCheck=0)
+	adrState = (adrState + 1) * (c == adrCmd[adrState]);
+	if (adrState == 5) {
+		LT_I("Auto download mode: rebooting");
+		LT.restart();
+	}
+}
+#endif
+
 static void callback(int port, void *param) {
 	RingBuffer *buf = (RingBuffer *)param;
 	int ch;
 	while ((ch = uart_read_byte(port)) != -1) {
+#if LT_AUTO_DOWNLOAD_REBOOT && defined(PIN_SERIAL1_RX)
+		// parse UART protocol commands on UART1
+		if (port == UART1_PORT)
+			adrParse(ch);
+#endif
 		buf->store_char(ch);
 	}
 }

arduino/beken-72xx/cores/arduino/main.cpp

@@ -16,6 +16,10 @@ beken_thread_t mainThread;
 void initArduino() {
 	// set default UART output port
 	uart_print_port = LT_UART_DEFAULT_PORT - 1;
+#if LT_AUTO_DOWNLOAD_REBOOT && defined(PIN_SERIAL1_RX) && defined(PIN_SERIAL1_TX)
+	// initialize auto-download-reboot parser
+	Serial1.begin(115200);
+#endif
 }
 
 bool startMainTask() {

arduino/libretuya/core/LibreTuyaConfig.h

@@ -86,6 +86,10 @@
 #define LT_MICROS_HIGH_RES 1
 #endif
 
+#ifndef LT_AUTO_DOWNLOAD_REBOOT
+#define LT_AUTO_DOWNLOAD_REBOOT 1
+#endif
+
 // Per-module logging output - applies to all loglevels
 #ifndef LT_DEBUG_ALL
 #define LT_DEBUG_ALL 0

arduino/libretuya/core/main.cpp

@@ -52,12 +52,12 @@ void runPeriodicTasks() {
 int main(void) {
 	// print a startup banner
 	LT_BANNER();
+	// initialize C library
+	__libc_init_array();
 	// inform about the reset reason
 	LT_I("Reset reason: %u", LT.getResetReason());
 	// initialize Arduino framework
 	initArduino();
-	// initialize C library
-	__libc_init_array();
 	// optionally initialize per-variant code
 	initVariant();
 	// initialize FAL