sometimes epStatus does not match with ep

[rossi]

In my usb2.0 host firmware test, I found something weird.

These are some code snippets and the resulting logs.

static void
CyFxHostXferCb (uint8_t ep, CyU3PUsbHostEpStatus_t epStatus)
{
    CyU3PReturnStatus_t status = CY_U3P_SUCCESS;

    CyU3PDebugPrint (4, "CyFxHostXferCb ep=0x%x epStatus=0x%x\r\n",ep,epStatus);

    /* Queue the next request */
    if (ep != 0)
    {
        status = CyU3PUsbHostEpSetXfer (ep, CY_U3P_USB_HOST_EPXFER_NORMAL, 0);
        CyU3PDebugPrint (4, "CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x%x\r\n",status);
    }
}

/* This function initializes the USB host stack. */
void
CyFxUsbHostStart ()
{
    CyU3PUsbHostConfig_t hostCfg;
    CyU3PReturnStatus_t status;

    hostCfg.ep0LowLevelControl = CyFalse;
    hostCfg.eventCb = CyFxHostEventCb;
    hostCfg.xferCb = CyFxHostXferCb;
    status = CyU3PUsbHostStart (&hostCfg);
    if (status != CY_U3P_SUCCESS)
    {
        return;
    }
}

...
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x141
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
CyFxHostXferCb ep=0x81 epStatus=0x40
CyFxHostXferCb CyU3PUsbHostEpSetXfer(0) status=0x0
...

According to the following table, the last 4digits(3:0) indicate ep number.

When we look at the logs,

as we know, ep=0x81 means EP_NUM=1

CyFxHostXferCb ep=0x81 epStatus=0x141 -> This makes sense because, EP_NUM of epStatus is "1"

But in the following case,

CyFxHostXferCb ep=0x81 epStatus=0x40 -> epStatus tells EP_NUM is "0" instead of "1", which does not match with ep=0x81.

How should I interpret this discrepancy?

Regards,

Rossi

[Rashi_Vatsa · Accepted solution]

Hello,

Please confirm if the behavior is same when CyU3PDebuPrint is not called in the interrupt callback