FX3S storage write in override mode

SaMe_4645651 · ‎Apr 15, 2020

Hi everyone,

I'm developing an application based on the MSC example for the FX3S. In some cases, I need to manually read/write data to the storage.

This is the DMA configuration:

CyU3PDmaChannelConfig_t dmaConfig;
dmaConfig.size = 512;
dmaConfig.count = CY_FX_MSC_DMA_BUF_COUNT;
dmaConfig.prodSckId = (CyU3PDmaSocketId_t) (CY_U3P_UIB_SOCKET_PROD_0 | CY_FX_MSC_EP_BULK_OUT_SOCKET);
dmaConfig.consSckId = CY_U3P_SIB_SOCKET_0;
dmaConfig.dmaMode = CY_U3P_DMA_MODE_BYTE;
dmaConfig.notification = CY_U3P_DMA_CB_RECV_CPLT | CY_U3P_DMA_CB_SEND_CPLT | CY_U3P_DMA_CB_PROD_EVENT | CY_U3P_DMA_CB_CONS_EVENT;
dmaConfig.cb = UsbStorage_DmaStorageWriteCb;
dmaConfig.prodHeader = 0;
dmaConfig.prodFooter = 0;
dmaConfig.consHeader = 0;
dmaConfig.prodAvailCount = 0;
status = CyU3PDmaChannelCreate(&glChHandleMscOut, CY_U3P_DMA_TYPE_MANUAL, &dmaConfig);
dmaConfig.prodSckId = CY_U3P_SIB_SOCKET_1;
dmaConfig.consSckId = (CyU3PDmaSocketId_t) (CY_U3P_UIB_SOCKET_CONS_0 | CY_FX_MSC_EP_BULK_IN_SOCKET);
dmaConfig.notification = CY_U3P_DMA_CB_RECV_CPLT | CY_U3P_DMA_CB_SEND_CPLT | CY_U3P_DMA_CB_PROD_EVENT | CY_U3P_DMA_CB_CONS_EVENT;
dmaConfig.cb = UsbStorage_DmaStorageReadCb;
status = CyU3PDmaChannelCreate(&glChHandleMscIn, CY_U3P_DMA_TYPE_MANUAL, &dmaConfig);

I am using the following command sequence to initiate a read/write request. (Each return status check here is omitted for brevity: every call returns SUCCESS until WaitForCompletion).

// Prepare the DMA Buffer
CyU3PDmaBuffer_t dmaBuf;
dmaBuf.buffer = buf;
dmaBuf.status = 0;
dmaBuf.size = (len + 15) & 0xFFF0; // Round up to a multiple of 16.
dmaBuf.count = len;
CyU3PDmaChannel *handle = (isRead) ? &glChHandleMscIn : &glChHandleMscOut;
if(isRead)
    CyU3PDmaChannelSetupRecvBuffer(handle, &dmaBuf);
else
    CyU3PDmaChannelSetupSendBuffer(handle, &dmaBuf);
CyU3PSibReadWriteRequest(isRead, ((lun >= CY_FX_SIB_PARTITIONS) ? 1 : 0), glLunUnit[lun], len / CY_FX_SIB_MAX_BLOCK_SIZE, startAddr, 1);
ret = CyU3PDmaChannelWaitForCompletion(handle, CYU3P_WAIT_FOREVER); // ret == "ABORTED" when trying to write!

Reads are successful. When trying to WRITE, the DmaStorageWriteCb callback is not called and the WaitForCompletion function returns ABORTED.

I've checked the docs and the forums and couldn't find an answer. Can you help me?

Thanks,
Salvatore

SaMe_4645651 · ‎Apr 16, 2020

Hello everyone,

I've solved it. I've added a check before the CyU3PDmaChannelSetupRecvBuffer()/CyU3PDmaChannelSetupSendBuffer() calls:

CyU3PDmaState_t state; uint32_t prodCount, consCount;
CyU3PDmaChannelGetStatus(handle, &state, &prodCount, &consCount);
while(state != CY_U3P_DMA_CONFIGURED && state != CY_U3P_DMA_RECV_COMPLETED && state != CY_U3P_DMA_SEND_COMPLETED)
{
    CyU3PThreadSleep(10);
    CyU3PDmaChannelGetStatus(handle, &state, &prodCount, &consCount);
}

Thanks for the help.

Regards,
Salvatore.

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FX3S storage write in override mode

FX3S storage write in override mode

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