How to enable DMA mode to transfer data using SDIO Posted on May 26, 2017 at 06:18
Hello,
I am using STM32F411RET6 chip to access uSD card with SDIO 4bit. By default it uses polling mode to read/write data with SDIO, such asBSP_SD_ReadBlocks().
The problem is that I want to continuously write 128k bytes data to uSD at a time. Writing is often interrupted by other timers, which causes the failure of the writing. After timers are disabled, the writing is successful without problem.
I guess DMA mode wouldn't be interrupted by the timers.
In order to use DMA, i generate code using cubemx.MX_DMA_Init() has been defined and called at the beginning of main().
in hal_map.c, the DMA has been initialized.
If I simply replace HAL_SD_WriteBlocks
with HAL_SD_WriteBlocks_DMA, it doesn't work at all.
How to enable to use the DMA?
/**
* Enable DMA controller clock
*/
void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__DMA2_CLK_ENABLE();
/* DMA interrupt init */
HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 4, 0);
HAL_NVI
