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USB Superspeed Peripherals

Anonymous
Not applicable

Hi All,

   

I try to create an automatic DMA channel with SPI as the consumer. This is how I go about doing this:

   
    CyU3PMemSet((uint8_t *)&dmaConfig, 0, sizeof(dmaConfig));                                                                                                                                                                                      dmaConfig.size = pageLen;     dmaConfig.count          = 0;     dmaConfig.prodAvailCount = 0;     dmaConfig.dmaMode        = CY_U3P_DMA_MODE_BYTE;     dmaConfig.prodHeader     = 0;     dmaConfig.prodFooter     = 0;     dmaConfig.consHeader     = 0;     dmaConfig.notification   = 0;     dmaConfig.cb             = NULL;      /* Channel to write to SPI flash. */     dmaConfig.prodSckId =  CY_U3P_UIB_SOCKET_PROD_1;     dmaConfig.consSckId = CY_U3P_LPP_SOCKET_SPI_CONS;     status = CyU3PDmaChannelCreate(         &glSpiTxHandle,         CY_U3P_DMA_TYPE_AUTO,         &dmaConfig     );
   

The execution of CyU3PDmaChannelCreate is not succesful.

   

If CY_U3P_UIB_SOCKET_PROD_1 is replaced with CY_U3P_CPU_SOCKET_PROD and CY_U3P_DMA_TYPE_AUTO is replaced with CY_U3P_DMA_TYPE_MANUAL_OUT then the function succeeds.

   

Do you understand what I am doing wrong?

   
 
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Anonymous
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Please check the error code returned by the DmaChannelCreate API and refer the API guide on what it means. Also, please check if CY_U3P_UIB_SOCKET_PROD_1 is already used by any other Dma Channel in your firmware.

   

Regards,

   

- Madhu Sudhan

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