Wed Feb 1 22:32:43 CST 2017

Author: kolban

Makefile

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+#include <esp_log.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <driver/ledc.h>
+#include "sdkconfig.h"
+
+static char tag[] = "led_dim";
+
+
+
+void task_led_dim(void *ignore) {
+	int bitSize       = 15;
+	int minValue      = 0;  // micro seconds (uS)
+	int maxValue      = 1<<bitSize; // micro seconds (uS)
+	int sweepDuration = 4000; // milliseconds (ms)
+	int duty          = (1<<bitSize) * minValue / 20000 ;
+	int direction     = 1; // 1 = up, -1 = down
+	int valueChangeRate = 20; // msecs
+
+	ESP_LOGD(tag, ">> task_led_dim");
+	ledc_timer_config_t timer_conf;
+	timer_conf.bit_num    = LEDC_TIMER_15_BIT;
+	timer_conf.freq_hz    = 300;
+	timer_conf.speed_mode = LEDC_HIGH_SPEED_MODE;
+	timer_conf.timer_num  = LEDC_TIMER_0;
+	ledc_timer_config(&timer_conf);
+
+	ledc_channel_config_t ledc_conf;
+	ledc_conf.channel    = LEDC_CHANNEL_0;
+	ledc_conf.duty       = duty;
+	ledc_conf.gpio_num   = 4;
+	ledc_conf.intr_type  = LEDC_INTR_DISABLE;
+	ledc_conf.speed_mode = LEDC_HIGH_SPEED_MODE;
+	ledc_conf.timer_sel  = LEDC_TIMER_0;
+	ledc_channel_config(&ledc_conf);
+
+	int changesPerSweep = sweepDuration / valueChangeRate;
+	int changeDelta = (maxValue-minValue) / changesPerSweep;
+	int i;
+	ESP_LOGD(tag, "sweepDuration: %d seconds", sweepDuration);
+	ESP_LOGD(tag, "changesPerSweep: %d", changesPerSweep);
+	ESP_LOGD(tag, "changeDelta: %d", changeDelta);
+	ESP_LOGD(tag, "valueChangeRate: %d", valueChangeRate);
+	while(1) {
+		for (i=0; i<changesPerSweep; i++) {
+			if (direction > 0) {
+				duty += changeDelta;
+			} else {
+				duty -= changeDelta;
+			}
+			ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, duty);
+			ledc_update_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0);
+			vTaskDelay(valueChangeRate/portTICK_PERIOD_MS);
+		}
+		direction = -direction;
+		ESP_LOGD(tag, "Direction now %d", direction);
+	} // End loop forever
+
+	vTaskDelete(NULL);
+}

hardware/LEDs/ledDim.c

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+#include <esp_log.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <driver/ledc.h>
+#include "sdkconfig.h"
+
+static char tag[] = "servo1";
+
+
+
+void task_servoSweep(void *ignore) {
+	int bitSize         = 15;
+	int minValue        = 500;  // micro seconds (uS)
+	int maxValue        = 2500; // micro seconds (uS)
+	int sweepDuration   = 1500; // milliseconds (ms)
+	int duty            = (1<<bitSize) * minValue / 20000 ;
+	int direction       = 1; // 1 = up, -1 = down
+	int valueChangeRate = 20; // msecs
+
+	ESP_LOGD(tag, ">> task_servo1");
+	ledc_timer_config_t timer_conf;
+	timer_conf.bit_num    = LEDC_TIMER_15_BIT;
+	timer_conf.freq_hz    = 50;
+	timer_conf.speed_mode = LEDC_HIGH_SPEED_MODE;
+	timer_conf.timer_num  = LEDC_TIMER_0;
+	ledc_timer_config(&timer_conf);
+
+	ledc_channel_config_t ledc_conf;
+	ledc_conf.channel    = LEDC_CHANNEL_0;
+	ledc_conf.duty       = duty;
+	ledc_conf.gpio_num   = 16;
+	ledc_conf.intr_type  = LEDC_INTR_DISABLE;
+	ledc_conf.speed_mode = LEDC_HIGH_SPEED_MODE;
+	ledc_conf.timer_sel  = LEDC_TIMER_0;
+	ledc_channel_config(&ledc_conf);
+
+	int changesPerSweep = sweepDuration / valueChangeRate;
+	int changeDelta = (maxValue-minValue) / changesPerSweep;
+	int i;
+	ESP_LOGD(tag, "sweepDuration: %d seconds", sweepDuration);
+	ESP_LOGD(tag, "changesPerSweep: %d", changesPerSweep);
+	ESP_LOGD(tag, "changeDelta: %d", changeDelta);
+	ESP_LOGD(tag, "valueChangeRate: %d", valueChangeRate);
+	while(1) {
+		for (i=0; i<changesPerSweep; i++) {
+			if (direction > 0) {
+				duty += changeDelta;
+			} else {
+				duty -= changeDelta;
+			}
+			ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, duty);
+			ledc_update_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0);
+			vTaskDelay(valueChangeRate/portTICK_PERIOD_MS);
+		}
+		direction = -direction;
+		ESP_LOGD(tag, "Direction now %d", direction);
+	} // End loop forever
+
+	vTaskDelete(NULL);
+}

hardware/servos/servoSweep.c

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+### See also
+* hardware/servos

pwm/README.md

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+### See also
+* hardware/neopixels
+* hardware/infrared