打开PWM组件
修改board.h的宏
这里注意移植的时候要将HAL_TIM_Base_MspInit函数名改为HAL_TIM_PWM_MspInit
修改board.c，在文件最后增加以下内容（因为用的是PA15所以要这个函数HAL_MspInit）
/**
* Initializes the Global MSP.
*/
void HAL_MspInit(void)
{
/* USER CODE BEGIN MspInit 0 */
/* USER CODE END MspInit 0 */
__HAL_RCC_AFIO_CLK_ENABLE();
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_AFIO_REMAP_SWJ_NOJTAG();//JTAG-DP Disabled and SW-DP Enabled 为了使用 PA15 PB3 PB4
/* USER CODE BEGIN MspInit 1 */
/* USER CODE END MspInit 1 */
}
/**
* @brief TIM_Base MSP Initialization
* This function configures the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */
/* USER CODE END TIM2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_TIM2_CLK_ENABLE();
/* USER CODE BEGIN TIM2_MspInit 1 */
/* USER CODE END TIM2_MspInit 1 */
}
}
void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(htim->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspPostInit 0 */
/* USER CODE END TIM2_MspPostInit 0 */
__HAL_RCC_GPIOA_CLK_ENABLE();
/**TIM2 GPIO Configuration
PA15 ------> TIM2_CH1
*/
GPIO_InitStruct.Pin = GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
__HAL_AFIO_REMAP_TIM2_PARTIAL_1();
/* USER CODE BEGIN TIM2_MspPostInit 1 */
/* USER CODE END TIM2_MspPostInit 1 */
}
}
使用pwm
#define PWM_DEV_NAME "pwm2" /* PWM设备名称 */
#define PWM_DEV_CHANNEL 1 /* PWM通道 */
struct rt_device_pwm *pwm_dev; /* PWM设备句柄 */
static int pwm_led_sample(int argc, char *argv[])
{
rt_uint32_t period, pulse;
period = 500000; /* 周期为0.5ms，单位为纳秒ns */
pulse = period / 2; /* PWM脉冲宽度值，单位为纳秒ns 50%占空比*/
/* 查找设备 */
pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
if (pwm_dev == RT_NULL)
{
rt_kprintf("pwm sample run failed! can't find %s device!\n", PWM_DEV_NAME);
return RT_ERROR;
}
/* 设置PWM周期和脉冲宽度默认值 */
rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);
/* 使能设备 */
rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);
}
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