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examples: Standardise naming of files, symbols, etc. in examples
* Use "example" in all example function & variable names, ie use i2c_example_xxx instead of i2c_xxx for example functions. Closes #198 https://github.com/espressif/esp-idf/issues/198 * Mark example functions, etc. static * Replace uses of "test" & "demo" with "example" * Split the UART example into two * Rename "main" example files to end with "_main.c" for disambiguation
This commit is contained in:
Angus Gratton
150
examples/peripherals/ledc/main/ledc_example_main.c
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150
examples/peripherals/ledc/main/ledc_example_main.c
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/* Ledc fade 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 "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/xtensa_api.h"
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#include "freertos/queue.h"
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#include "driver/ledc.h"
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#include "esp_attr.h"
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#include "esp_err.h"
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/*
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* About this example
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* 1. init LEDC module:
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* a. You need to set the timer of LEDC first, this decide the frequency and resolution of PWM.
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* b. You need to set the LEDC channel you want to use, and bind with one of the timers.
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*
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* 2. You can install a default fade function, then you can use fade APIs.
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*
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* 3. You can also set a target duty directly without fading.
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*
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* 4. This example use GPIO18/19/4/5 as LEDC ouput, and it will change the duty repeatedly.
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*
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* 5. GPIO18/19 are from high speed channel group. GPIO4/5 are from low speed channel group.
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*
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*/
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#define LEDC_HS_TIMER LEDC_TIMER_0
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#define LEDC_HS_MODE LEDC_HIGH_SPEED_MODE
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#define LEDC_HS_CH0_GPIO (18)
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#define LEDC_HS_CH0_CHANNEL LEDC_CHANNEL_0
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#define LEDC_HS_CH1_GPIO (19)
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#define LEDC_HS_CH1_CHANNEL LEDC_CHANNEL_1
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#define LEDC_LS_TIMER LEDC_TIMER_1
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#define LEDC_LS_MODE LEDC_LOW_SPEED_MODE
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#define LEDC_LS_CH2_GPIO (4)
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#define LEDC_LS_CH2_CHANNEL LEDC_CHANNEL_2
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#define LEDC_LS_CH3_GPIO (5)
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#define LEDC_LS_CH3_CHANNEL LEDC_CHANNEL_3
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#define LEDC_TEST_CH_NUM (4)
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typedef struct {
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int channel;
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int io;
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int mode;
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int timer_idx;
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} ledc_info_t;
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void app_main()
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{
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int ch;
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ledc_info_t ledc_ch[LEDC_TEST_CH_NUM] = {
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{
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.channel = LEDC_HS_CH0_CHANNEL,
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.io = LEDC_HS_CH0_GPIO,
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.mode = LEDC_HS_MODE,
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.timer_idx = LEDC_HS_TIMER
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},
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{
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.channel = LEDC_HS_CH1_CHANNEL,
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.io = LEDC_HS_CH1_GPIO,
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.mode = LEDC_HS_MODE,
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.timer_idx = LEDC_HS_TIMER
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},
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{
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.channel = LEDC_LS_CH2_CHANNEL,
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.io = LEDC_LS_CH2_GPIO,
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.mode = LEDC_LS_MODE,
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.timer_idx = LEDC_LS_TIMER
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},
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{
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.channel = LEDC_LS_CH3_CHANNEL,
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.io = LEDC_LS_CH3_GPIO,
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.mode = LEDC_LS_MODE,
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.timer_idx = LEDC_LS_TIMER
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}
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};
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ledc_timer_config_t ledc_timer = {
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.bit_num = LEDC_TIMER_13_BIT, //set timer counter bit number
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.freq_hz = 5000, //set frequency of pwm
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.speed_mode = LEDC_HS_MODE, //timer mode,
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.timer_num = LEDC_HS_TIMER //timer index
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};
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//configure timer0 for high speed channels
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ledc_timer_config(&ledc_timer);
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//configure timer1 for low speed channels
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ledc_timer.speed_mode = LEDC_LS_MODE;
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ledc_timer.timer_num = LEDC_LS_TIMER;
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ledc_timer_config(&ledc_timer);
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_channel_config_t ledc_channel = {
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//set LEDC channel 0
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.channel = ledc_ch[ch].channel,
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//set the duty for initialization.(duty range is 0 ~ ((2**bit_num)-1)
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.duty = 0,
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//GPIO number
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.gpio_num = ledc_ch[ch].io,
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//GPIO INTR TYPE, as an example, we enable fade_end interrupt here.
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.intr_type = LEDC_INTR_FADE_END,
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//set LEDC mode, from ledc_mode_t
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.speed_mode = ledc_ch[ch].mode,
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//set LEDC timer source, if different channel use one timer,
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//the frequency and bit_num of these channels should be the same
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.timer_sel = ledc_ch[ch].timer_idx,
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};
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//set the configuration
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ledc_channel_config(&ledc_channel);
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}
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//initialize fade service.
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ledc_fade_func_install(0);
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while (1) {
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printf("LEDC fade up\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_fade_with_time(ledc_ch[ch].mode, ledc_ch[ch].channel, 4000, 2000);
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ledc_fade_start(ledc_ch[ch].mode, ledc_ch[ch].channel, LEDC_FADE_NO_WAIT);
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}
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vTaskDelay(3000 / portTICK_PERIOD_MS);
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printf("LEDC fade down\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_fade_with_time(ledc_ch[ch].mode, ledc_ch[ch].channel, 0, 2000);
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ledc_fade_start(ledc_ch[ch].mode, ledc_ch[ch].channel, LEDC_FADE_NO_WAIT);
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}
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vTaskDelay(3000 / portTICK_PERIOD_MS);
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printf("LEDC set duty without fade\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_duty(ledc_ch[ch].mode, ledc_ch[ch].channel, 2000);
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ledc_update_duty(ledc_ch[ch].mode, ledc_ch[ch].channel);
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}
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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printf("LEDC set duty without fade\n");
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for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
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ledc_set_duty(ledc_ch[ch].mode, ledc_ch[ch].channel, 0);
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ledc_update_duty(ledc_ch[ch].mode, ledc_ch[ch].channel);
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}
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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}
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