refactor services, increase max sockets - release

components/services/battery.c

@@ -0,0 +1,57 @@
+/*
+   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/timers.h"
+#include "esp_system.h"
+#include "esp_log.h"
+#include "driver/adc.h"
+#include "battery.h"
+
+#define BATTERY_TIMER	(10*1000)
+
+static const char TAG[] = "battery";
+
+#ifdef CONFIG_SQUEEZEAMP
+static struct {
+	float sum, avg;
+	int count;
+	TimerHandle_t timer;
+} battery;
+#endif
+
+/****************************************************************************************
+ * 
+ */
+static void battery_callback(TimerHandle_t xTimer) {
+	battery.sum += adc1_get_raw(ADC1_CHANNEL_7) / 4095. * (10+174)/10. * 1.1;
+	if (++battery.count == 30) {
+		battery.avg = battery.sum / battery.count;
+		battery.sum = battery.count = 0;
+		ESP_LOGI(TAG, "Voltage %.2fV", battery.avg);
+	}	
+}
+
+/****************************************************************************************
+ * 
+ */
+void battery_svc_init(void) {
+#ifdef CONFIG_SQUEEZEAMP			
+	ESP_LOGI(TAG, "Initializing battery");
+
+	adc1_config_width(ADC_WIDTH_BIT_12);
+    adc1_config_channel_atten(ADC1_CHANNEL_7, ADC_ATTEN_DB_0);
+
+	battery.timer = xTimerCreate("battery", BATTERY_TIMER / portTICK_RATE_MS, pdTRUE, NULL, battery_callback);
+	xTimerStart(battery.timer, portMAX_DELAY);
+#endif				
+}