Page 6 of 16
Page 140
#include <stdio.h>
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "driver/ledc.h"
void app_main(void)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.timer_num = 0,
.duty_resolution = LEDC_TIMER_13_BIT,
.freq_hz = 4000,
.clk_cfg = LEDC_APB_CLK};
ledc_timer_config(&ledc_timer);
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.channel = 0,
.timer_sel = 0,
.intr_type = LEDC_INTR_DISABLE,
.gpio_num = 2,
.duty = 4096,
.hpoint = 0};
ledc_channel_config(&ledc_channel);
}
Page 143
#include <stdio.h>
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "esp_rom_sys.h"
#include "driver/ledc.h"
#include <unistd.h>
void delay_us(int t)
{
usleep(t);
}
void PWMconfigLow(int gpio, int chan, int timer, int res,
int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void changeDutyLow(int chan, int res, float duty)
{
ledc_set_duty(LEDC_LOW_SPEED_MODE, chan,
((float)(2 << (res - 1))) * duty);
ledc_update_duty(LEDC_LOW_SPEED_MODE, chan);
}
void app_main(void)
{
PWMconfigLow(2, 0, 3, 13, 4000, 0.25);
while (true)
{
delay_us(1000);
changeDutyLow(0, 13, 0.5);
delay_us(1000);
changeDutyLow(0, 13, 0.25);
}
}
Page 146
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "esp_rom_sys.h"
#include <sys/time.h>
#include "driver/ledc.h"
#include "math.h"
#include <unistd.h>
void delay_us(int t)
{
usleep(t);
}
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
uint8_t wave[256];
void app_main(void)
{
for (int i = 0; i < 256; i++)
{
wave[i] = (uint8_t)((128.0 +
sinf((float)i * 2.0 * 3.14159 / 255.0) * 128.0));
}
int f = 60000;
int t = (1 * 1000 * 1000) / f;
PWMconfigLow(2, 0, 0, 8, f, 0.25);
fflush(stdout);
while (true)
{
for (int i = 0; i < 256; i++)
{
ledc_set_duty(LEDC_LOW_SPEED_MODE, 0, wave[i]);
ledc_update_duty(LEDC_LOW_SPEED_MODE, 0);
delay_us(t);
}
}
}
Page 148
#include <stdio.h>
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "esp_rom_sys.h"
#include <sys/time.h>
#include "driver/ledc.h"
void delay_ms(int t)
{
vTaskDelay(t / portTICK_PERIOD_MS);
}
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void app_main(void)
{
while (true)
{
PWMconfigLow(2, 0, 0, 8, 2000, 0.5);
for (int d = 0; d <= 256; d++)
{
ledc_set_duty(LEDC_LOW_SPEED_MODE, 0, d);
ledc_update_duty(LEDC_LOW_SPEED_MODE, 0);
delay_ms(10);
}
}
}
Page 150 complete program to do cubic dimming
#include <stdio.h>
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "esp_rom_sys.h"
#include <sys/time.h>
#include "driver/ledc.h"
void delay_ms(int t)
{
vTaskDelay(t / portTICK_PERIOD_MS);
}
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void app_main(void)
{
while (true)
{
PWMconfigLow(2, 0, 0, 8, 2000, 0.5);
for (int d = 0; d <= 256; d++)
{
ledc_set_duty(LEDC_LOW_SPEED_MODE, 0, d * d * d / 255 / 255);
ledc_update_duty(LEDC_LOW_SPEED_MODE, 0);
delay_ms(10);
}
}
}
Page 154
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "driver/ledc.h"
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer.deconfigure = false;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void app_main(void)
{
PWMconfigLow(2, 0, 0, 8, 2550, 0);
ledc_fade_func_install(LEDC_INTR_DISABLE);
while (true)
{
ledc_set_fade_with_time(LEDC_LOW_SPEED_MODE, 0, 255, 1000);
ledc_fade_start(LEDC_LOW_SPEED_MODE, 0, LEDC_FADE_WAIT_DONE);
ledc_set_fade_with_time(LEDC_LOW_SPEED_MODE, 0, 0, 1000);
ledc_fade_start(LEDC_LOW_SPEED_MODE, 0, LEDC_FADE_WAIT_DONE);
}
}
Page 155 complete program from fragment
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "driver/ledc.h"
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer.deconfigure = false;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void app_main(void)
{
PWMconfigLow(2, 0, 0, 8, 2550, 0);
ledc_fade_func_install(LEDC_INTR_DISABLE);
while (true)
{
ledc_set_fade_with_step(LEDC_LOW_SPEED_MODE, 0, 255, 1, 10);
ledc_fade_start(LEDC_LOW_SPEED_MODE, 0, LEDC_FADE_WAIT_DONE);
ledc_set_fade_with_step(LEDC_LOW_SPEED_MODE, 0, 0, 1, 10);
ledc_fade_start(LEDC_LOW_SPEED_MODE, 0, LEDC_FADE_WAIT_DONE);
}
}
Page 156
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "driver/ledc.h"
void PWMconfigLow(int gpio, int chan, int timer, int res, int freq, float duty)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.clk_cfg = LEDC_APB_CLK};
ledc_timer.timer_num = timer;
ledc_timer.duty_resolution = res;
ledc_timer.freq_hz = freq;
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.hpoint = 0,
.intr_type = LEDC_INTR_DISABLE,
};
ledc_channel.channel = chan;
ledc_channel.timer_sel = timer;
ledc_channel.gpio_num = gpio;
ledc_channel.duty = ((float)(2 << (res - 1))) * duty;
ledc_timer.deconfigure = false;
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
}
void changeDutyPhaseLow(int chan, int res, float duty, float phase)
{
ledc_set_duty_with_hpoint(LEDC_LOW_SPEED_MODE, chan,
((float)(2 << (res - 1))) * duty,
((float)(2 << (res - 1))) * phase);
ledc_update_duty(LEDC_LOW_SPEED_MODE, chan);
}
void app_main(void)
{
PWMconfigLow(2, 0, 0, 8, 2550, 0.5);
PWMconfigLow(4, 1, 0, 8, 2550, 0.5);
changeDutyPhaseLow(1, 8, 0.5, 0.25);
}
