Make status LED configurable (disabled by default)

main/io.cpp

@@ -16,7 +16,10 @@
 #define IO_TAG "IO"
 
 #define ESP_INTR_FLAG_DEFAULT 0
-#define STATUS_LED_PIN GPIO_NUM_2
+
+bool status_led_enabled = false;
+bool status_led_negated = false;
+gpio_num_t status_led_gpio;
 
 #define DEBOUNCE_MILLIS 10
 const TickType_t debounce_delay_ticks = std::max(DEBOUNCE_MILLIS / portTICK_PERIOD_MS, (TickType_t) 1);
@@ -140,8 +143,17 @@ void add_button(gpio_num_t gpio, std::string topic, std::string message) {
     add_button(gpio, [topic, message](){ publish_message(topic, message); });
 }
 
+void enable_status_led(gpio_num_t gpio, bool negated) {
+    gpio_init_output(gpio, true);
+    status_led_gpio = gpio;
+    status_led_enabled = true;
+    status_led_negated = negated;
+}
+
 void set_status_led(uint32_t level) {
-    ESP_ERROR_CHECK(gpio_set_level(STATUS_LED_PIN, level));
+    if (status_led_enabled) {
+        ESP_ERROR_CHECK(gpio_set_level(status_led_gpio, level ^ status_led_negated));
+    }
 }
 
 void gpio_init_output(gpio_num_t gpio_num, uint32_t level) {

main/qthing.h

@@ -35,6 +35,9 @@ typedef struct {
 
 typedef std::function<void(ota_event_t)> ota_event_callback_t;
 
+// core
+void enable_status_led(gpio_num_t gpio = GPIO_NUM_2, bool negated = false);
+
 // network
 void enable_wlan();