rtthread studio低版本的PWM 问题

static rt_err_t stm32_hw_pwm_init(struct stm32_pwm *device)
{
    rt_err_t result = RT_EOK;
    TIM_HandleTypeDef *tim = RT_NULL;
    TIM_OC_InitTypeDef oc_config = {0};
    TIM_MasterConfigTypeDef master_config = {0};
    TIM_ClockConfigTypeDef clock_config = {0};

    RT_ASSERT(device != RT_NULL);

    tim = (TIM_HandleTypeDef *)&device->tim_handle;

    /* configure the timer to pwm mode */
    tim->Init.Prescaler = 0;
    tim->Init.CounterMode = TIM_COUNTERMODE_UP;
    tim->Init.Period = 0;
    tim->Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
#if defined(SOC_SERIES_STM32F1) || defined(SOC_SERIES_STM32L4)
    tim->Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
#endif
    ***if (HAL_TIM_Base_Init(tim) != HAL_OK)   /* 注意这里是定时器的初始化，别看混了！！！ */
    {
        LOG_E("%s tim init failed", device->name);
        result = -RT_ERROR;
        goto __exit;
    }***

    if (HAL_TIM_PWM_Init(tim) != HAL_OK)
    {
        LOG_E("%s pwm init failed", device->name);
        result = -RT_ERROR;
        goto __exit;
    }

    clock_config.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
    if (HAL_TIM_ConfigClockSource(tim, &clock_config) != HAL_OK)
    {
        LOG_E("%s clock init failed", device->name);
        result = -RT_ERROR;
        goto __exit;
    }

    master_config.MasterOutputTrigger = TIM_TRGO_RESET;
    master_config.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(tim, &master_config) != HAL_OK)
    {
        LOG_E("%s master config failed", device->name);
        result = -RT_ERROR;
        goto __exit;
    }

    oc_config.OCMode = TIM_OCMODE_PWM1;
    oc_config.Pulse = 0;
    oc_config.OCPolarity = TIM_OCPOLARITY_HIGH;
    oc_config.OCFastMode = TIM_OCFAST_DISABLE;
    oc_config.OCNIdleState = TIM_OCNIDLESTATE_RESET;
    oc_config.OCIdleState  = TIM_OCIDLESTATE_RESET;

    /* config pwm channel */
    if (device->channel & 0x01)
    {
        if (HAL_TIM_PWM_ConfigChannel(tim, &oc_config, TIM_CHANNEL_1) != HAL_OK)
        {
            LOG_E("%s channel1 config failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }
    }

    if (device->channel & 0x02)
    {
        if (HAL_TIM_PWM_ConfigChannel(tim, &oc_config, TIM_CHANNEL_2) != HAL_OK)
        {
            LOG_E("%s channel2 config failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }
    }

    if (device->channel & 0x04)
    {
        if (HAL_TIM_PWM_ConfigChannel(tim, &oc_config, TIM_CHANNEL_3) != HAL_OK)
        {
            LOG_E("%s channel3 config failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }
    }

    if (device->channel & 0x08)
    {
        if (HAL_TIM_PWM_ConfigChannel(tim, &oc_config, TIM_CHANNEL_4) != HAL_OK)
        {
            LOG_E("%s channel4 config failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }
    }

    /* pwm pin configuration */
    HAL_TIM_MspPostInit(tim);

    /* enable update request source */
    __HAL_TIM_URS_ENABLE(tim);

__exit:
    return result;
}

在官方步骤后，需要在文件“drv_pwm.c”源文件中的stm32_hw_pwm_init()函数内加入部分初始化代码：

    if (HAL_TIM_Base_Init(tim) != HAL_OK)	/* 注意这里是定时器的初始化，别看混了！！！ */
    {
        LOG_E("%s tim init failed", device->name);
        result = -RT_ERROR;
        goto __exit;
    }