[realtek-ambz] Add gpioRecover() to disable SWD

arduino/libretuya/core/LibreTuyaAPI.cpp

@@ -167,3 +167,7 @@ bool LibreTuya::otaCanRollback() {
 		return true;
 	return false;
 }
+
+__attribute__((weak)) void LibreTuya::gpioRecover() {
+	// nop by default
+}

arduino/libretuya/core/LibreTuyaAPI.h

@@ -93,6 +93,11 @@ class LibreTuya {
 	 * @brief Reboot the CPU.
 	 */
 	void restart();
+	/**
+	 * @brief Reconfigure GPIO pins used for debugging
+	 * (SWD/JTAG), so that they can be used as normal I/O.
+	 */
+	void gpioRecover();
 
   public: /* CPU-related */
 	/**

arduino/realtek-ambz/cores/arduino/LibreTuyaAPI.cpp

@@ -12,6 +12,13 @@ void LibreTuya::restart() {
 	sys_reset();
 }
 
+void LibreTuya::gpioRecover() {
+	// PA14 and PA15 are apparently unusable with SWD enabled
+	sys_jtag_off();
+	Pinmux_Config(PA_14, PINMUX_FUNCTION_GPIO);
+	Pinmux_Config(PA_15, PINMUX_FUNCTION_GPIO);
+}
+
 /* CPU-related */
 
 ChipType LibreTuya::getChipType() {