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https://github.com/espressif/ESP8266_RTOS_SDK.git
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72cbf0d55e
* Supports fractional phase, making the phase function produce higher precision waveforms. * Enhanced stability
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/* pwm example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "esp_err.h"
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#include "esp8266/gpio_register.h"
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#include "esp8266/pin_mux_register.h"
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#include "driver/pwm.h"
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#define PWM_0_OUT_IO_NUM 12
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#define PWM_1_OUT_IO_NUM 13
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#define PWM_2_OUT_IO_NUM 14
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#define PWM_3_OUT_IO_NUM 15
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// PWM period 1000us(1Khz), same as depth
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#define PWM_PERIOD (1000)
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static const char *TAG = "pwm_example";
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// pwm pin number
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const uint32_t pin_num[4] = {
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PWM_0_OUT_IO_NUM,
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PWM_1_OUT_IO_NUM,
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PWM_2_OUT_IO_NUM,
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PWM_3_OUT_IO_NUM
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};
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// duties table, real_duty = duties[x]/PERIOD
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uint32_t duties[4] = {
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500, 500, 500, 500,
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};
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// phase table, delay = (phase[x]/360)*PERIOD
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float phase[4] = {
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0, 0, 90.0, -90.0,
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};
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void app_main()
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{
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pwm_init(PWM_PERIOD, duties, 4, pin_num);
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pwm_set_phases(phase);
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pwm_start();
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int16_t count = 0;
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while (1) {
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if (count == 20) {
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// channel0, 1 output hight level.
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// channel2, 3 output low level.
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pwm_stop(0x3);
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ESP_LOGI(TAG, "PWM stop\n");
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} else if (count == 30) {
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pwm_start();
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ESP_LOGI(TAG, "PWM re-start\n");
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count = 0;
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}
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count++;
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vTaskDelay(1000 / portTICK_RATE_MS);
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}
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}
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