add a quick LED helper / prepare SqueezeAMP menuconfig

components/io/component.mk

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+#
+# Component Makefile
+#
+# This Makefile should, at the very least, just include $(SDK_PATH)/Makefile. By default,
+# this will take the sources in the src/ directory, compile them and link them into
+# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
+# please read the SDK documents if you need to do this.
+#
+
+COMPONENT_ADD_INCLUDEDIRS := .

components/io/led.c

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+/*
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/timers.h"
+#include "esp_system.h"
+#include "esp_log.h"
+#include "driver/gpio.h"
+#include "led.h"
+
+#define MAX_LED	8
+#define BLOCKTIME	10	// up to portMAX_DELAY
+
+static struct led_s {
+	gpio_num_t gpio;
+	bool on;
+	int onstate;
+	int ontime, offtime;
+	int waiton, waitoff;
+	TimerHandle_t timer;
+} leds[MAX_LED];
+
+static void vCallbackFunction( TimerHandle_t xTimer ) {
+	struct led_s *led = (struct led_s*) pvTimerGetTimerID (xTimer);
+	
+	if (!led->timer) return;
+	
+	led->on = !led->on;
+	gpio_set_level(led->gpio, led->on ? led->onstate : !led->onstate);
+	
+	// was just on for a while
+	if (!led->on && led->offtime == -1) return;
+	
+	// regular blinking
+	xTimerChangePeriod(xTimer, (led->on ? led->ontime : led->offtime) / portTICK_RATE_MS, BLOCKTIME);
+}
+
+bool led_blink_core(int idx, int ontime, int offtime, bool wait) {
+	if (!leds[idx].gpio) return false;
+	
+	if (leds[idx].timer) {
+		// low priority timers will wait	
+		if (wait && xTimerIsTimerActive(leds[idx].timer)) {
+			leds[idx].waiton = ontime; 
+			leds[idx].waitoff = offtime; 
+			return true;
+		}
+		xTimerStop(leds[idx].timer, BLOCKTIME);
+	}
+	
+	leds[idx].ontime = ontime;
+	leds[idx].offtime = offtime;	
+			
+	if (ontime == 0) {
+		gpio_set_level(leds[idx].gpio, !leds[idx].onstate);
+	} else if (offtime == 0) {
+		gpio_set_level(leds[idx].gpio, leds[idx].onstate);
+	} else {
+		if (!leds[idx].timer) leds[idx].timer = xTimerCreate("ledTimer", ontime / portTICK_RATE_MS, pdFALSE, (void *)&leds[idx], vCallbackFunction);
+        leds[idx].on = true;
+		gpio_set_level(leds[idx].gpio, leds[idx].onstate);
+		if (xTimerStart(leds[idx].timer, BLOCKTIME) == pdFAIL) return false;
+	}
+	
+	return true;
+} 
+
+bool led_release(int idx) {
+	if (!leds[idx].gpio) return false;
+	
+	if (leds[idx].waiton) {
+		led_blink_core(idx, leds[idx].waiton, leds[idx].waitoff, false);
+		leds[idx].waiton = 0;
+	} else {
+		gpio_set_level(leds[idx].gpio, !leds[idx].onstate);
+	}	
+	
+	return true;
+}	
+
+bool led_config(int idx, gpio_num_t gpio, int onstate) {
+	if (idx >= MAX_LED) return false;
+	leds[idx].gpio = gpio;
+	leds[idx].onstate = onstate;
+	
+	gpio_pad_select_gpio(gpio);
+	gpio_set_direction(gpio, GPIO_MODE_OUTPUT);
+	gpio_set_level(gpio, !onstate);
+	
+	return true;
+}

components/io/led.h

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+/* 
+ *  Squeezelite for esp32
+ *
+ *  (c) Sebastien 2019
+ *      Philippe G. 2019, philippe_44@outlook.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+ 
+#ifndef LED_H
+
+#include "driver/gpio.h"
+
+enum { LED_GREEN = 0, LED_RED };
+
+#define led_on(idx)						led_blink_core(idx, 1, 0, false)
+#define led_off(idx)					led_blink_core(idx, 0, 0, false)
+#define led_blink(idx, on, off)			led_blink_core(idx, on, off, false)
+#define led_blink_wait(idx, on, off)	led_blink_core(idx, on, off, true)
+
+bool led_blink_core(int idx, int ontime, int offtime, bool wait);
+bool led_release(int idx);
+bool led_config(int idx, gpio_num_t gpio, int onstate);
+
+#endif