Posted on September 21, 2017 at 09:26Hello!
I use the microcontroller STM32F205ret6, STMCubeMX v4.22.0, Firmware vSTM32Cube_FW_F2_v1.6.0. Configured to work with SD card in SDIO + FatFs mode without DMA. Recording to the card comes at a speed of 2.5 MB / s- it suits me perfectly. I write blocks of 25600 bytes, 1 block records 15 mSec. I need to save the processor from the work of transferring data to the SD card.
For this example:
https://community.st.com/servlet/JiveServlet/download/1546-1-8967/SDIO+DMA+FatFS+CubeMX.pdf
&
https://community.st.com/s/contentdocument/0690X0000060Hm6QAE
When unpacking an archive, you can not read its contents.
tuned SDIO + DMA. Here are my settings:
hdma_sdio.Instance = DMA2_Stream6;
hdma_sdio.Init.Channel = DMA_CHANNEL_4;
hdma_sdio.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_sdio.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdio.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdio.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdio.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdio.Init.Mode = DMA_PFCTRL;
hdma_sdio.Init.Priority = DMA_PRIORITY_LOW;
hdma_sdio.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
hdma_sdio.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
hdma_sdio.Init.MemBurst = DMA_MBURST_INC4;
hdma_sdio.Init.PeriphBurst = DMA_PBURST_INC4;
main.c:
&sharppragma pack(4)
FATFS SDFatFs;
&sharppragma pack(4)
FIL MyFile;
&sharppragma pack(4)
uint8_t capture_buf[25600];
Interrupts fulfills:
void SDIO_IRQHandler(void)
{
HAL_SD_IRQHandler(&hsd);
}
void DMA2_Stream3_IRQHandler(void)
{
HAL_DMA_IRQHandler(&hdma_sdio);
}
After exiting from HAL_SD_ReadBlocks_DMA.
Goes in cycles in anticipation: while ((HAL_SD_STATE_BUSY == state_return) && (SD_WAIT_TIMEOUT > timeout))
After the timeout, it goes out with an error.
Where is my mistake? Or is it not me?
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