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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-09-23 charlown first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#ifdef BSP_USING_PWM
#define LOG_TAG "drv.pwm"
#include <drv_log.h>
#ifndef ITEM_NUM
#define ITEM_NUM(items) sizeof(items) / sizeof(items[0])
#endif
#define MAX_COUNTER 65535
#define MIN_COUNTER 2
#define MIN_PULSE 2
struct rtdevice_pwm_device
{
struct rt_device_pwm parent;
TIM_TypeDef *periph;
rt_uint8_t channel[4];
char *name;
};
/*
* channel = 0xFF: the channel is not use.
*/
struct rtdevice_pwm_device pwm_device_list[] =
{
#ifdef BSP_USING_TIM1_PWM
{
.periph = TIM1,
.name = "pwm1",
#ifdef BSP_USING_TIM1_PWM_CH1
.channel[0] = TIM_Channel_1,
#else
.channel[0] = 0xFF,
#endif
#ifdef BSP_USING_TIM1_PWM_CH2
.channel[1] = TIM_Channel_2,
#else
.channel[1] = 0xFF,
#endif
#ifdef BSP_USING_TIM1_PWM_CH3
.channel[2] = TIM_Channel_3,
#else
.channel[2] = 0xFF,
#endif
#ifdef BSP_USING_TIM1_PWM_CH4
.channel[3] = TIM_Channel_4,
#else
.channel[3] = 0xFF,
#endif
},
#endif
#ifdef BSP_USING_TIM2_PWM
{
.periph = TIM2,
.name = "pwm2",
#ifdef BSP_USING_TIM2_PWM_CH1
.channel[0] = TIM_Channel_1,
#else
.channel[0] = 0xFF,
#endif
#ifdef BSP_USING_TIM2_PWM_CH2
.channel[1] = TIM_Channel_2,
#else
.channel[1] = 0xFF,
#endif
#ifdef BSP_USING_TIM2_PWM_CH3
.channel[2] = TIM_Channel_3,
#else
.channel[2] = 0xFF,
#endif
#ifdef BSP_USING_TIM2_PWM_CH4
.channel[3] = TIM_Channel_4,
#else
.channel[3] = 0xFF,
#endif
},
#endif
#ifdef BSP_USING_TIM3_PWM
{
.periph = TIM3,
.name = "pwm3",
#ifdef BSP_USING_TIM3_PWM_CH1
.channel[0] = TIM_Channel_1,
#else
.channel[0] = 0xFF,
#endif
#ifdef BSP_USING_TIM3_PWM_CH2
.channel[1] = TIM_Channel_2,
#else
.channel[1] = 0xFF,
#endif
#ifdef BSP_USING_TIM3_PWM_CH3
.channel[2] = TIM_Channel_3,
#else
.channel[2] = 0xFF,
#endif
#ifdef BSP_USING_TIM3_PWM_CH4
.channel[3] = TIM_Channel_4,
#else
.channel[3] = 0xFF,
#endif
},
#endif
#ifdef BSP_USING_TIM4_PWM
{
.periph = TIM4,
.name = "pwm4",
#ifdef BSP_USING_TIM4_PWM_CH1
.channel[0] = TIM_Channel_1,
#else
.channel[0] = 0xFF,
#endif
#ifdef BSP_USING_TIM4_PWM_CH2
.channel[1] = TIM_Channel_2,
#else
.channel[1] = 0xFF,
#endif
#ifdef BSP_USING_TIM4_PWM_CH3
.channel[2] = TIM_Channel_3,
#else
.channel[2] = 0xFF,
#endif
#ifdef BSP_USING_TIM4_PWM_CH4
.channel[3] = TIM_Channel_4,
#else
.channel[3] = 0xFF,
#endif
},
#endif
};
static rt_err_t ch32f1_pwm_device_enable(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration, rt_bool_t enable)
{
struct rtdevice_pwm_device *pwm_device;
rt_uint32_t channel_index;
rt_uint16_t ccx_state;
pwm_device = (struct rtdevice_pwm_device *)device;
channel_index = configuration->channel;
if (enable == RT_TRUE)
{
ccx_state = TIM_CCx_Enable;
}
else
{
ccx_state = TIM_CCx_Disable;
}
if (channel_index <= 4 && channel_index > 0)
{
if (pwm_device->channel[channel_index - 1] == 0xFF)
return -RT_EINVAL;
TIM_CCxCmd(pwm_device->periph, pwm_device->channel[channel_index - 1], ccx_state);
}
else
{
return -RT_EINVAL;
}
TIM_Cmd(pwm_device->periph, ENABLE);
return RT_EOK;
}
static rt_err_t ch32f1_pwm_device_get(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
{
struct rtdevice_pwm_device *pwm_device;
rt_uint32_t arr_counter, ccr_counter, prescaler, sample_freq;
rt_uint32_t channel_index;
rt_uint32_t tim_clock;
pwm_device = (struct rtdevice_pwm_device *)device;
tim_clock = ch32f1_tim_clock_get(pwm_device->periph);
channel_index = configuration->channel;
arr_counter = pwm_device->periph->ATRLR + 1;
prescaler = pwm_device->periph->PSC + 1;
sample_freq = (tim_clock / prescaler) / arr_counter;
/* unit:ns */
configuration->period = 1000000000 / sample_freq;
if (channel_index == 1)
{
ccr_counter = pwm_device->periph->CH1CVR + 1;
configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
}
else if (channel_index == 2)
{
ccr_counter = pwm_device->periph->CH2CVR + 1;
configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
}
else if (channel_index == 3)
{
ccr_counter = pwm_device->periph->CH3CVR + 1;
configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
}
else if (channel_index == 4)
{
ccr_counter = pwm_device->periph->CH4CVR + 1;
configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
}
else
return -RT_EINVAL;
return RT_EOK;
}
static rt_err_t ch32f1_pwm_device_set(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
{
struct rtdevice_pwm_device *pwm_device;
rt_uint32_t arr_counter, ccr_counter, prescaler, sample_freq;
rt_uint32_t channel_index;
rt_uint32_t tim_clock;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitType;
TIM_OCInitTypeDef TIM_OCInitType;
pwm_device = (struct rtdevice_pwm_device *)device;
tim_clock = ch32f1_tim_clock_get(pwm_device->periph);
channel_index = configuration->channel;
/* change to freq, unit:Hz */
sample_freq = 1000000000 / configuration->period;
/*counter = (tim_clk / prescaler) / sample_freq */
/*normally, tim_clk is not need div, if arr_counter over 65536, need div.*/
prescaler = 1;
arr_counter = (tim_clock / prescaler) / sample_freq;
if (arr_counter > MAX_COUNTER)
{
/* need div tim_clock
* and round up the prescaler value.
* (tim_clock >> 16) = tim_clock / 65536
*/
if ((tim_clock >> 16) % sample_freq == 0)
prescaler = (tim_clock >> 16) / sample_freq;
else
prescaler = (tim_clock >> 16) / sample_freq + 1;
/*counter = (tim_clk / prescaler) / sample_freq */
arr_counter = (tim_clock / prescaler) / sample_freq;
}
/* ccr_counter = duty cycle * arr_counter */
ccr_counter = (configuration->pulse * 100 / configuration->period) * arr_counter / 100;
/* check arr_counter > 1, cxx_counter > 1 */
if (arr_counter < MIN_COUNTER)
{
arr_counter = MIN_COUNTER;
}
if (ccr_counter < MIN_PULSE)
{
ccr_counter = MIN_PULSE;
}
/* TMRe base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseInitType);
TIM_TimeBaseInitType.TIM_Period = arr_counter - 1;
TIM_TimeBaseInitType.TIM_Prescaler = prescaler - 1;
TIM_TimeBaseInitType.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitType.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(pwm_device->periph, &TIM_TimeBaseInitType);
TIM_OCStructInit(&TIM_OCInitType);
TIM_OCInitType.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitType.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitType.TIM_Pulse = ccr_counter - 1;
TIM_OCInitType.TIM_OCPolarity = TIM_OCPolarity_High;
if (channel_index == 1)
{
TIM_OC1Init(pwm_device->periph, &TIM_OCInitType);
TIM_OC1PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
}
else if (channel_index == 2)
{
TIM_OC2Init(pwm_device->periph, &TIM_OCInitType);
TIM_OC2PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
}
else if (channel_index == 3)
{
TIM_OC3Init(pwm_device->periph, &TIM_OCInitType);
TIM_OC3PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
}
else if (channel_index == 4)
{
TIM_OC4Init(pwm_device->periph, &TIM_OCInitType);
TIM_OC4PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
}
else
{
return -RT_EINVAL;
}
TIM_ARRPreloadConfig(pwm_device->periph, ENABLE);
TIM_CtrlPWMOutputs(pwm_device->periph, ENABLE);
return RT_EOK;
}
static rt_err_t drv_pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
{
struct rt_pwm_configuration *configuration;
configuration = (struct rt_pwm_configuration *)arg;
switch (cmd)
{
case PWM_CMD_ENABLE:
return ch32f1_pwm_device_enable(device, configuration, RT_TRUE);
case PWM_CMD_DISABLE:
return ch32f1_pwm_device_enable(device, configuration, RT_FALSE);
case PWM_CMD_SET:
return ch32f1_pwm_device_set(device, configuration);
case PWM_CMD_GET:
return ch32f1_pwm_device_get(device, configuration);
default:
return -RT_EINVAL;
}
}
static struct rt_pwm_ops pwm_ops =
{
.control = drv_pwm_control};
static int rt_hw_pwm_init(void)
{
int result = RT_EOK;
int index = 0;
int channel_index;
for (index = 0; index < ITEM_NUM(pwm_device_list); index++)
{
ch32f1_tim_clock_init(pwm_device_list[index].periph);
for (channel_index = 0; channel_index < sizeof(pwm_device_list[index].channel); channel_index++)
{
if (pwm_device_list[index].channel[channel_index] != 0xFF)
{
ch32f1_pwm_io_init(pwm_device_list[index].periph, pwm_device_list[index].channel[channel_index]);
}
}
if (rt_device_pwm_register(&pwm_device_list[index].parent, pwm_device_list[index].name, &pwm_ops, RT_NULL) == RT_EOK)
{
LOG_D("%s register success", pwm_device_list[index].name);
}
else
{
LOG_D("%s register failed", pwm_device_list[index].name);
result = -RT_ERROR;
}
}
return result;
}
INIT_BOARD_EXPORT(rt_hw_pwm_init);
#endif /* BSP_USING_PWM */
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