（STM32）PWM DMA

CubeMX 配置

1. Channel2 -- PWM Generation CH2
2. DMA Setting -- TIM CH2 通用配置(内存到外设)
3. 参数配置 -- Prescaler(决定占空比调节的精细度)，Counter period(和前者一起，决定了周期)

PWM DMA

#include "default_task.h"
#include "main.h"
#include "syscfg.h"
#include "FreeRTOS.h"
#include "task.h"
#include "tim.h"

#define NUM 9
uint32_t send_Buf[9] = { 0};
void default_task(void *pt){
    for (int i = 0; i < NUM; i++){
        send_Buf[i] = 100 * (i + 1);
    }
    send_Buf[NUM - 1] = 0;
    HAL_TIM_PWM_Start_DMA(&htim2,TIM_CHANNEL_2,send_Buf,NUM);
    for(;;){
        HAL_TIM_PWM_Start_DMA(&htim2,TIM_CHANNEL_2,send_Buf,NUM);

        vTaskDelay(10);
    }
}
void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
{
    HAL_TIM_PWM_Stop_DMA(&htim2, TIM_CHANNEL_2);
}