usb_host_msc

Sorry brad, i am not clear on your exact problem. the last line says that your application works with CCS. Can you please clarify.

Regards

Baskaran

I got usb_host_msc to work on my platform (GNSS receiver) using CCS and loading through JTAG. I then moved all required libraries over to the compiler we use for production (RVDS4.1). I merged usb_host_msc into my application on my platform. This platform runs our own boot code also. In the process, after much debugging, I have found what appears to be some sort of race condition or a need to check some kind of status. I assume this does not show up under JTAG since many clocks are running slower than my production board. I modified usbhostenum.c as follows:

USBHCDPipeWrite(unsigned int ulIndex, unsigned int ulPipe,
                      unsigned char *pucData, unsigned int ulSize)
{
    unsigned int ulEndpoint;
    unsigned int ulRemainingBytes;
    unsigned int ulByteToSend;
    unsigned int ulPipeIdx;

#ifdef DMA_MODE
    unsigned int txBuffer;
    unsigned int nBlocks;
    unsigned int ulLength;
#endif

#if defined(USB_DELAY_HACK)
//    TxString(2,"PipeWrite\r\n"); //Seems to insert a critical delay
    delay(1);  //delay 1 ms
#endif

AND usbhscsi.c as follows:

USBHSCSISendCommand(unsigned int ulIndex, unsigned int ulInPipe,
                              unsigned int ulOutPipe, tMSCCBW *pSCSICmd,
                              unsigned char *pucData, unsigned int *pulSize)
{
    tMSCCSW CmdStatus;
    unsigned int ulBytes;

    //
    // Initialize the command status.
    //
    CmdStatus.dCSWSignature = 0;
    CmdStatus.dCSWTag = 0;
    CmdStatus.bCSWStatus = SCSI_CMD_STATUS_FAIL;

    //
    // Set the CBW signature and tag.
    //
    pSCSICmd->dCBWSignature = CBW_SIGNATURE;
    pSCSICmd->dCBWTag = CBW_TAG_VALUE;

    //
    // Set the size of the data to be returned by the device.
    //
    pSCSICmd->dCBWDataTransferLength = *pulSize;

    //
    // Send the command.
    //
#if defined(USB_DELAY_HACK)
//    TxString(2,"SCSI_2\r\n");  //seems to insert a critical delay
    delay(1);  //delay 1 ms
#endif

static unsigned int
USBHSCSISendCommand(unsigned int ulIndex, unsigned int ulInPipe,
                              unsigned int ulOutPipe, tMSCCBW *pSCSICmd,
                              unsigned char *pucData, unsigned int *pulSize)
{
    tMSCCSW CmdStatus;
    unsigned int ulBytes;

    //
    // Initialize the command status.
    //
    CmdStatus.dCSWSignature = 0;
    CmdStatus.dCSWTag = 0;
    CmdStatus.bCSWStatus = SCSI_CMD_STATUS_FAIL;

    //
    // Set the CBW signature and tag.
    //
    pSCSICmd->dCBWSignature = CBW_SIGNATURE;
    pSCSICmd->dCBWTag = CBW_TAG_VALUE;

    //
    // Set the size of the data to be returned by the device.
    //
    pSCSICmd->dCBWDataTransferLength = *pulSize;

    //
    // Send the command.
    //
#if defined(USB_DELAY_HACK)
//    TxString(2,"SCSI_2\r\n");  //seems to insert a critical delay
    delay(1);  //delay 1 ms
#endif

I HAVE NOT TRIED USING LESS THAN 1ms yet and I am using DMA_MODE. Not using DMA_MODE made no difference.

Further, I went through the same porting procedure with usb_dev_serial and had NO PROBLEMS doing that at all, it worked great right away.

Brad,

            There can be 2 possibilities

          1. Your bootloader is missing something which is done by gel file

          2. Race condition as you mentioned- to confirm this after loading your application try "free run" (menu->run->free run)  instead of "run". This should not induce any delay, so you should see the problem here too.

Regards

Baskaran

I reduced the 3 delays I mentioned from 1ms to 1us. This greatly improved the initial response time on the file system ls command. Anyway, I am sure with some work the problem can be narrowed down further.

In my GEL file I run my CPU at 500MHz --- in my boot loader I am set up to run at 720MHz, so I could slow down my cpu and see what that does.

The problem seems to be related to USBHSCSISendCommand in usbhsci.c. I put a 1 micro-second delay before each call to USBHSCSISendCommand (8 places in usbhsci.c) and I do not have any problems.

Lowering my cpu speed to 500MHz from 720MHz was of no help.

oops --- the file I modified is usbhscsi.c NOT usbhsci.c