main: also check GPIO0 for DFU

main/main.c

@@ -40,17 +40,24 @@ void app_main(void)
 {
 	// check DFU force
 	gpio_config_t io_conf = {}; // to configure GPIO
+	// GPIO0 can also be pressed while soft reboot
+	io_conf.pin_bit_mask = (1ULL << 0); // GPIO to configure
+	io_conf.intr_type = GPIO_INTR_DISABLE; // disable interrupt
+	io_conf.mode = GPIO_MODE_INPUT; // set as input
+	io_conf.pull_down_en = false; // disable pull-down mode
+	io_conf.pull_up_en = true; // enable pull-up mode
+	ESP_ERROR_CHECK( gpio_config(&io_conf) ); // configure GPIO
+	// dedicated DFU button
 	io_conf.pin_bit_mask = (1ULL << DFU_PIN); // GPIO to configure
 	io_conf.intr_type = GPIO_INTR_DISABLE; // disable interrupt
 	io_conf.mode = GPIO_MODE_INPUT; // set as input
 	io_conf.pull_down_en = 1; // enable pull-down mode
 	io_conf.pull_up_en = 0; // disable pull-up mode
 	ESP_ERROR_CHECK( gpio_config(&io_conf) ); // configure GPIO
-	if (gpio_get_level(DFU_PIN)) { // DFU mode asserted
+	if (!gpio_get_level(0) || gpio_get_level(DFU_PIN)) { // DFU mode asserted
 		tud_dfu_runtime_reboot_to_dfu_cb(); // reboot to DFU mode
 	}
 
-
 	// configure LEDs
 	io_conf.pin_bit_mask = (1ULL << LED_BOARD); // GPIO to configure
 	io_conf.intr_type = GPIO_INTR_DISABLE; // disable interrupt