From 9152b953aa4b516238fd8f009775ccb52d42a4be Mon Sep 17 00:00:00 2001
From: demik <demik475@gmail.com>
Date: Tue, 18 Mar 2025 18:30:07 +0100
Subject: [PATCH] added flash switch watchdog

---
 main/gpio.c | 39 +++++++++++++++++++++++++++++++++++++++
 main/gpio.h |  1 +
 2 files changed, 40 insertions(+)

diff --git a/main/gpio.c b/main/gpio.c
index 5708384..774d006 100644
--- a/main/gpio.c
+++ b/main/gpio.c
@@ -24,10 +24,36 @@
 #include "sdkconfig.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "esp_log.h"
 #include "esp_system.h"
 
 #include "gpio.h"
 
+/* defines */
+#define TAG "GPIO"
+
+/* global values */
+QueueHandle_t q_flash = NULL;
+
+/* prototypes */
+static void gpio_flash(void* arg);
+static void gpio_isr_handler(void* arg);
+
+static void gpio_flash(void* arg) {
+	uint32_t gpio_num;
+
+	(void)arg;
+
+	ESP_LOGI(TAG, "flash task started on core %d", xPortGetCoreID());
+	while (1) {
+		if (xQueueReceive(q_flash, &gpio_num, portMAX_DELAY)) {
+			configASSERT(gpio_num == 0);
+			ESP_LOGW(TAG, "flash switch changed, restarting");
+			esp_restart();
+		}
+	}
+}
+
 void	gpio_init(void) {
 	/* LEDs */
 	gpio_reset_pin(GPIO_GREENLED);
@@ -71,6 +97,19 @@ void	gpio_init(void) {
 	gpio_set_direction(GPIO_QX2, GPIO_MODE_OUTPUT);
 	gpio_set_direction(GPIO_QY1, GPIO_MODE_OUTPUT);
 	gpio_set_direction(GPIO_QY2, GPIO_MODE_OUTPUT);
+
+	/* Flash mode watchdog */
+	gpio_reset_pin(GPIO_FLASH);
+	gpio_set_direction(GPIO_FLASH, GPIO_MODE_INPUT);
+	q_flash = xQueueCreate(10, sizeof(uint32_t));
+	xTaskCreatePinnedToCore(gpio_flash, "FLASH", 2 * 1024, NULL, 10, NULL, 0);
+	gpio_install_isr_service(0);
+	gpio_isr_handler_add(GPIO_FLASH, gpio_isr_handler, (void*) GPIO_FLASH);
+}
+
+static void IRAM_ATTR gpio_isr_handler(void* arg) {
+	uint32_t gpio_num = (uint32_t) arg;
+	xQueueSendFromISR(q_flash, &gpio_num, NULL);
 }
 
 void    gpio_transceiver_disable(void) {
diff --git a/main/gpio.h b/main/gpio.h
index 19d32e5..6d2a77f 100644
--- a/main/gpio.h
+++ b/main/gpio.h
@@ -48,6 +48,7 @@ void    gpio_transceiver_enable(void);
  * - GPIO17
  */
 
+#define GPIO_FLASH		0
 #define GPIO_ADB		4
 #define GPIO_CLICK		2
 #define GPIO_QX1		12