STM32H750 EMMC+DMA+DCACHE，FATFS返回FR_INT_ERR

最新推荐文章于 2025-06-12 14:59:03 发布

miaoguoqiang

最新推荐文章于 2025-06-12 14:59:03 发布

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文章标签： stm32 嵌入式硬件单片机

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在SD_read函数中BSP_SD_ReadBlocks_DMA之前对地址进行32字节对齐判断

代码如下:

#if defined(ENABLE_SCRATCH_BUFFER)
    if (!((uint32_t)buff & 0x03))
    {
#endif
        alignedAddr = (uint32_t)buff & ~(__SCB_DCACHE_LINE_SIZE - 1);
      
        if(((uint32_t)buff - alignedAddr) > 0) {
          SCB_CleanDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCK_SIZE + ((uint32_t)buff - alignedAddr));
        }
        
        /* Fast path cause destination buffer is correctly aligned */
        ret = BSP_SD_ReadBlocks_DMA((uint32_t*)buff, (uint32_t)(sector), count);

        if (ret == SD_OK) {
#if (osCMSIS < 0x20000U)