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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-11-26 ChuShicheng first version
*/
#include <rtdevice.h>
#include "drv_pwm.h"
#include "driver/ledc.h"
#ifdef BSP_USING_PWM
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.PWM"
#define LEDC_MODE LEDC_LOW_SPEED_MODE
#define LEDC_DUTY_DEFAULT (4095) // Set duty to 50%. ((2 ** 13) - 1) * 50% = 4095
#define LEDC_FREQUENCY_DEFAULT (5000) // Frequency in Hertz. Set frequency at 5 kHz
struct esp_pwm
{
struct rt_device_pwm pwm_device;
rt_uint8_t timer_num;
char *name;
};
static struct esp_pwm esp_pwm_obj[] =
{
#ifdef BSP_USING_PWM0
{
.name = "pwm0",
.timer_num = 0,
}
#endif /* BSP_USING_PWM0 */
};
static rt_err_t _pwm_set(struct esp_pwm *obj, struct rt_pwm_configuration *configuration)
{
float period = configuration->period;
float pulse = configuration->pulse;
float duty = 8191 * (pulse / period); // ((2 ** 13) - 1) * (pulse / period_hz)
float period_hz = 1000000000 / configuration->period;
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_MODE,
.timer_num = obj->timer_num,
.duty_resolution = LEDC_TIMER_13_BIT,
.freq_hz = (uint32_t)period_hz, // Set output frequency at 5 kHz
.clk_cfg = LEDC_AUTO_CLK
};
ESP_ERROR_CHECK(ledc_timer_config(&ledc_timer));
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, configuration->channel, (uint32_t)duty));
// Update duty to apply the new value
ESP_ERROR_CHECK(ledc_update_duty(LEDC_MODE, configuration->channel));
return RT_EOK;
}
static rt_err_t _pwm_get(struct esp_pwm *obj, struct rt_pwm_configuration *configuration)
{
uint32_t period_hz = ledc_get_freq(LEDC_MODE, obj->timer_num);
LOG_W("period_hz:%d", period_hz);
uint32_t duty = ledc_get_duty(LEDC_MODE, configuration->channel);
LOG_W("duty:%d", duty);
configuration->period = 1000000000 / period_hz;
configuration->pulse = duty * configuration->period / 8191;
LOG_W("pulse:%d", configuration->pulse);
return RT_EOK;
}
static void pwm_enabled(struct esp_pwm *obj, struct rt_pwm_configuration *configuration, rt_uint8_t enable)
{
if(enable)
{
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_MODE,
.timer_num = obj->timer_num,
.duty_resolution = LEDC_TIMER_13_BIT,
.freq_hz = LEDC_FREQUENCY_DEFAULT, // Set output frequency at 5 kHz
.clk_cfg = LEDC_AUTO_CLK
};
ESP_ERROR_CHECK(ledc_timer_config(&ledc_timer));
// Prepare and then apply the LEDC PWM channel configuration
ledc_channel_config_t ledc_channel = {
.speed_mode = LEDC_MODE,
.channel = configuration->channel,
.timer_sel = obj->timer_num,
.intr_type = LEDC_INTR_DISABLE,
.duty = LEDC_DUTY_DEFAULT, // ((2 ** 13) - 1) * (pulse / period_hz)
.hpoint = 0
};
switch (configuration->channel)
{
case LEDC_CHANNEL_0:
ledc_channel.gpio_num = BSP_LEDC_CH0_GPIO;
break;
case LEDC_CHANNEL_1:
ledc_channel.gpio_num = BSP_LEDC_CH1_GPIO;
break;
case LEDC_CHANNEL_2:
ledc_channel.gpio_num = BSP_LEDC_CH2_GPIO;
break;
case LEDC_CHANNEL_3:
ledc_channel.gpio_num = BSP_LEDC_CH3_GPIO;
break;
case LEDC_CHANNEL_4:
ledc_channel.gpio_num = BSP_LEDC_CH4_GPIO;
break;
case LEDC_CHANNEL_5:
ledc_channel.gpio_num = BSP_LEDC_CH5_GPIO;
break;
default:
break;
}
ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel));
}
else
{
ESP_ERROR_CHECK(ledc_stop(LEDC_MODE, configuration->channel, 0));
}
}
static rt_err_t _pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
{
struct esp_pwm *_pwm = rt_container_of(device, struct esp_pwm, pwm_device);
struct rt_pwm_configuration *configuration = (struct rt_pwm_configuration *)arg;
switch (cmd)
{
case PWM_CMD_ENABLE:
pwm_enabled(_pwm, configuration, RT_TRUE);
return RT_EOK;
case PWM_CMD_DISABLE:
pwm_enabled(_pwm, configuration, RT_FALSE);
return RT_EOK;
case PWM_CMD_SET:
return _pwm_set(_pwm, configuration);
case PWM_CMD_GET:
return _pwm_get(_pwm, configuration);
default:
return -RT_EINVAL;
}
}
static struct rt_pwm_ops _pwm_ops =
{
_pwm_control
};
int rt_hw_pwm_init(void)
{
int result = RT_EOK;
for (int i = 0; i < sizeof(esp_pwm_obj) / sizeof(esp_pwm_obj[0]); i++)
{
esp_pwm_obj[i].timer_num = i;
result = rt_device_pwm_register(&esp_pwm_obj[i].pwm_device, esp_pwm_obj[i].name, &_pwm_ops, 0);
if(result != RT_EOK)
{
LOG_E("%s register fail.", esp_pwm_obj[i].name);
}
}
return result;
}
INIT_DEVICE_EXPORT(rt_hw_pwm_init);
#endif /* BSP_USING_PWM */
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