rt-thread/bsp/swm320/drivers/drv_pwm.c

/*
 * Copyright (c) 2006-2018, Synwit Technology Co.,Ltd.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-12-10     Zohar_Lee    first version
 * 2020-07-10     lik          format file
 */

#include "drv_pwm.h"

#ifdef RT_USING_PWM
#ifdef BSP_USING_PWM

//#define DRV_DEBUG
#define LOG_TAG "drv.pwm"
#include <drv_log.h>

#define MIN_PERIOD 2
#define MIN_PULSE 1

static struct swm_pwm_cfg pwm_cfg[] =
    {
#ifdef BSP_USING_PWM0
        PWM0_CFG,
#endif
#ifdef BSP_USING_PWM1
        PWM1_CFG,
#endif
#ifdef BSP_USING_PWM2
        PWM2_CFG,
#endif
#ifdef BSP_USING_PWM3
        PWM3_CFG,
#endif
#ifdef BSP_USING_PWM4
        PWM4_CFG,
#endif
#ifdef BSP_USING_PWM5
        PWM5_CFG,
#endif
};

static struct swm_pwm pwm_drv[sizeof(pwm_cfg) / sizeof(pwm_cfg[0])] = {0};

static rt_err_t swm_pwm_control(struct rt_device_pwm *pwm_device, int cmd, void *arg);
static struct rt_pwm_ops pwm_ops =
    {
        swm_pwm_control};

static rt_err_t swm_pwm_enable(struct rt_device_pwm *pwm_device, struct rt_pwm_configuration *configuration, rt_bool_t enable)
{
    struct swm_pwm_cfg *cfg = RT_NULL;
    RT_ASSERT(pwm_device != RT_NULL);
    cfg = pwm_device->parent.user_data;

    if (!enable)
    {
        if (PWM_CH_A == configuration->channel)
        {
            PWM_Stop(cfg->PWMx, 1, 0);
        }
        if (PWM_CH_B == configuration->channel)
        {
            PWM_Stop(cfg->PWMx, 0, 1);
        }
    }
    else
    {
        if (PWM_CH_A == configuration->channel)
        {
            PWM_Start(cfg->PWMx, 1, 0);
        }
        if (PWM_CH_B == configuration->channel)
        {
            PWM_Start(cfg->PWMx, 0, 1);
        }
    }

    return RT_EOK;
}

static rt_err_t swm_pwm_get(struct rt_device_pwm *pwm_device, struct rt_pwm_configuration *configuration)
{
    rt_uint64_t tim_clock;
    tim_clock = SystemCoreClock / 8;

    struct swm_pwm_cfg *cfg = RT_NULL;
    RT_ASSERT(pwm_device != RT_NULL);
    cfg = pwm_device->parent.user_data;

    /* Convert nanosecond to frequency and duty cycle. 1s = 1 * 1000 * 1000 * 1000 ns */
    tim_clock /= 1000000UL;
    configuration->period = PWM_GetCycle(cfg->PWMx, configuration->channel) * 1000UL / tim_clock;
    configuration->pulse = PWM_GetHDuty(cfg->PWMx, configuration->channel) * 1000UL / tim_clock;

    return RT_EOK;
}

static rt_err_t swm_pwm_set(struct rt_device_pwm *pwm_device, struct rt_pwm_configuration *configuration)
{
    rt_uint32_t period, pulse;
    rt_uint64_t tim_clock;
    tim_clock = SystemCoreClock / 8;

    struct swm_pwm_cfg *cfg = RT_NULL;
    RT_ASSERT(pwm_device != RT_NULL);
    cfg = pwm_device->parent.user_data;

    /* Convert nanosecond to frequency and duty cycle. 1s = 1 * 1000 * 1000 * 1000 ns */
    /* when SystemCoreClock = 120MHz, configuration->period max 4.369ms */
    /* when SystemCoreClock = 20MHz, configuration->period max 26.214ms */
    tim_clock /= 1000000UL;
    period = (unsigned long long)configuration->period * tim_clock / 1000ULL;
    pulse = (unsigned long long)configuration->pulse * tim_clock / 1000ULL;
    if (period < MIN_PERIOD)
    {
        period = MIN_PERIOD;
    }
    if (pulse < MIN_PULSE)
    {
        pulse = MIN_PULSE;
    }
    PWM_SetCycle(cfg->PWMx, configuration->channel, period);
    PWM_SetHDuty(cfg->PWMx, configuration->channel, pulse);

    return RT_EOK;
}

static rt_err_t swm_pwm_control(struct rt_device_pwm *pwm_device, int cmd, void *arg)
{
    RT_ASSERT(pwm_device != RT_NULL);

    struct rt_pwm_configuration *configuration = (struct rt_pwm_configuration *)arg;

    switch (cmd)
    {
    case PWM_CMD_ENABLE:
        return swm_pwm_enable(pwm_device, configuration, RT_TRUE);
    case PWM_CMD_DISABLE:
        return swm_pwm_enable(pwm_device, configuration, RT_FALSE);
    case PWM_CMD_SET:
        return swm_pwm_set(pwm_device, configuration);
    case PWM_CMD_GET:
        return swm_pwm_get(pwm_device, configuration);
    default:
        return RT_EINVAL;
    }
}

int rt_hw_pwm_init(void)
{
    int i = 0;
    int result = RT_EOK;

    for (i = 0; i < sizeof(pwm_cfg) / sizeof(pwm_cfg[0]); i++)
    {
        pwm_drv[i].cfg = &pwm_cfg[i];

        if (pwm_drv[i].cfg->PWMx == PWM0)
        {
#ifdef BSP_USING_PWM0A
            PORT_Init(PORTC, PIN2, FUNMUX0_PWM0A_OUT, 0);
#endif
#ifdef BSP_USING_PWM0B
            PORT_Init(PORTC, PIN4, FUNMUX0_PWM0B_OUT, 0);
#endif
        }
        else if (pwm_drv[i].cfg->PWMx == PWM1)
        {
#ifdef BSP_USING_PWM1A
            PORT_Init(PORTC, PIN3, FUNMUX1_PWM1A_OUT, 0);
#endif
#ifdef BSP_USING_PWM1B
            PORT_Init(PORTC, PIN5, FUNMUX1_PWM1B_OUT, 0);
#endif
        }
        else if (pwm_drv[i].cfg->PWMx == PWM2)
        {
#ifdef BSP_USING_PWM2A
            PORT_Init(PORTN, PIN4, FUNMUX0_PWM2A_OUT, 0);
#endif
#ifdef BSP_USING_PWM2B
            PORT_Init(PORTN, PIN6, FUNMUX0_PWM2B_OUT, 0);
#endif
        }
        else if (pwm_drv[i].cfg->PWMx == PWM3)
        {
#ifdef BSP_USING_PWM3A
            PORT_Init(PORTN, PIN3, FUNMUX1_PWM3A_OUT, 0);
#endif
#ifdef BSP_USING_PWM3B
            PORT_Init(PORTN, PIN5, FUNMUX1_PWM3B_OUT, 0);
#endif
        }
        else if (pwm_drv[i].cfg->PWMx == PWM4)
        {
#ifdef BSP_USING_PWM4A
            PORT_Init(PORTN, PIN8, FUNMUX0_PWM4A_OUT, 0);
#endif
#ifdef BSP_USING_PWM4B
            PORT_Init(PORTN, PIN10, FUNMUX0_PWM4B_OUT, 0);
#endif
        }
        else if (pwm_drv[i].cfg->PWMx == PWM5)
        {
#ifdef BSP_USING_PWM5A
            PORT_Init(PORTN, PIN7, FUNMUX1_PWM5A_OUT, 0);
#endif
#ifdef BSP_USING_PWM5B
            PORT_Init(PORTN, PIN9, FUNMUX1_PWM5B_OUT, 0);
#endif
        }

        PWM_Init(pwm_drv[i].cfg->PWMx, &(pwm_drv[i].cfg->pwm_initstruct));
        if (rt_device_pwm_register(&pwm_drv[i].pwm_device, pwm_drv[i].cfg->name, &pwm_ops, pwm_drv[i].cfg) == RT_EOK)
        {
            LOG_D("%s register success", pwm_drv[i].cfg->name);
        }
        else
        {
            LOG_E("%s register failed", pwm_drv[i].cfg->name);
            result = -RT_ERROR;
        }
    }
    return result;
}
INIT_DEVICE_EXPORT(rt_hw_pwm_init);

#endif /* BSP_USING_PWM */
#endif /* RT_USING_PWM */