STM32 pwm驱动优化，增加对CHxN通道输出的支持

发布于 2020-11-06 15:28:25 浏览：1091 订阅该版

**1. 修改stm32 pwm 驱动文件`drv_pwm.c` 的 `drv_pwm_enable` 函数：**
```c
static rt_err_t drv_pwm_enable(TIM_HandleTypeDef *htim, struct rt_pwm_configuration *configuration, rt_bool_t enable)
{
    /* Converts the channel number to the channel number of Hal library */
    rt_uint32_t channel = 0x04 * (configuration->channel - 1);

if (!enable)
    {
#ifdef BSP_USING_PWM1_CH1xN
        HAL_TIMEx_PWMN_Stop(htim, channel);
#else
        HAL_TIM_PWM_Stop(htim, channel);
#endif
    }
    else
    {
#ifdef BSP_USING_PWM1_CH1xN
        HAL_TIMEx_PWMN_Start(htim, channel);
#else
        HAL_TIM_PWM_Start(htim, channel);
#endif
    }

return RT_EOK;
}
```

**2. 修改Kconfig 文件，增加：**
````
config BSP_USING_PWM1_CH1
        bool "Enable pwm1 output"
        default n
        select RT_USING_PWM
        select BSP_USING_PWM1

if BSP_USING_PWM1_CH1
            config BSP_USING_PWM1_CH1xN
                bool "Enable pwm CH1xN channel"
                default n
        endif
```

**注意：** 
* Kconfig文件修改时按照实际的通道做修改
* 记得在ST的CubeMx工具中做对应的引脚配置