STM32F765 + SN8000 + DMA FIFO Error

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Anonymous
Not applicable

Using WICED Studio 5.0. We have Ported driver based on STM32F4, We are facing problem of DMA fifo Error while firmware download.We are not getting Fifo underrrun error in SDMMC2_STA register.We examined the Fifo burst length which seems to be fine.Please help.

Here is code snippet,

/* DMA prepare transfer */

SDIO->DTIMER = (uint32_t) 0xFFFFFFFF;

    SDIO->DLEN   = dma_transfer_size;

    SDIO->DCTRL  = (uint32_t)sdio_get_blocksize_dctrl(block_size) | bus_direction_mapping[(int)direction] | SDIO_TransferMode_Block | SDIO_DPSM_Enable | (1 << 3) | (1 << 11);

    /* DMA2 Stream0 */

    DMA2_Stream0->CR   = 0;

    DMA2->LIFCR        = (uint32_t) ( 0x3F );//( 0x3F << 22 );

    DMA2_Stream0->FCR  = (uint32_t) ( 0x00000021 | DMA_FIFOMode_Enable | DMA_FIFOThreshold_Full /*| (1<<7) fifo err */ );

    DMA2_Stream0->PAR  = (uint32_t) &SDIO->FIFO;

    DMA2_Stream0->M0AR = (uint32_t) dma_data_source;

    DMA2_Stream0->NDTR = dma_transfer_size/4;

/* Start DMA stream */

DMA2_Stream0->CR = (uint32_t)(DMA_DIR_MemoryToPeripheral |

                                       DMA_Channel_11 | DMA_PeripheralInc_Disable | DMA_MemoryInc_Enable |

                                       DMA_PeripheralDataSize_Word | DMA_MemoryDataSize_Word |

                                       DMA_Mode_Normal | DMA_Priority_VeryHigh |

                                       DMA_MemoryBurst_INC4 | DMA_PeripheralBurst_INC4 | DMA_SxCR_PFCTRL | DMA_SxCR_TCIE | DMA_SxCR_EN );

On execution of above step in SDIO IRQ,We are getting DMA FIFO error event bit set in DMA2_LISR register and transfer gets timedout.

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1 Solution
Anonymous
Not applicable

For STM32F4, the above mentioned snippet is used for firmware download. We have no idea on STM32F765 as this is not supported in WICED. I request you to contact STM for this issue. If you have anythink related to WICED please let us know.

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1 Reply
Anonymous
Not applicable

For STM32F4, the above mentioned snippet is used for firmware download. We have no idea on STM32F765 as this is not supported in WICED. I request you to contact STM for this issue. If you have anythink related to WICED please let us know.

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