add a quick LED helper / prepare SqueezeAMP menuconfig

components/io/led.c

@@ -0,0 +1,101 @@
+/*
+   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;
+}