200、stm32定义缓冲区用在DMA上时，需要谨记4字节地址对齐规则

@残梦2026-05-26 16:03

stm32定义缓冲区用在DMA上时，需要谨记4字节地址对齐规则，尤其是在结构体内定义缓冲区

修改方法：

或者直接把buffer放在结构体最前面

c 复制代码

/****************************************
@function:读取扇区数据
@param:buffer:数据存放缓冲区
  StartSector:起始扇区
  number:扇区个数
@return:false=失败，true=成功
@note:
****************************************/
static bool SD_Read(uint8_t *buffer,uint32_t StartSector,uint32_t number)
{
  if((buffer == NULL) || ((StartSector+number) > SampleParameter.SdCard.BlockNbr) || (number == 0))return false;
  //uint32_t time;
  //float speed;
  //printf("开始DMA读取 %d 个扇区...\r\n", number);
  //TICK_START();
  if(HAL_SD_ReadBlocks_DMA(&hsd1, buffer, StartSector, number) != HAL_OK)return false;
  SD_Wait_DMA();
  //time = TICK_END();
  //speed = calc_speed(SampleParameter.SdCard.BlockSize*number, time);
  //printf("读取完成！耗时：%lu ms，速度：%.2f MB/s\r\n", time, speed);
  return true;
}
static void printfData(uint8_t *name,uint8_t *pbuf,uint32_t len)
{
    printf("%s:",name);
    for(uint32_t i = 0;i < len;i++)printf("%d ",pbuf[i]);
    printf("\n");
}