I am using the K20 with MQX Lite and Processor Expert, and I'm having a problem with the USB CLEAR FEATURE command. The command is a CLEAR FEATURE (Endpoint Halt, Endpoint 1 IN). After this command is handled, the DATA0/1 toggle is uneffected. When I look at the code, and the documentation, there is a mismatch. I've tried setting the DATA0/1 bit instead of clearing since the description of the bit is the last setting of this bit. I have also used the value 0x40 for USB1_BD_LE_DATA1. Nothing changes the behavior of the DATA0/1 bit when view with the USB analyzer.
K20P100M72SF1RM.pdf
Processor Expert USBX.c
...
#define USB1_BD_LE_DATA1 0x40000000U
#define USB1_BD_LE_STALL 0x04000000U
...
void USB1_DeviceUnstallEndpoint(LDD_TDeviceData *DeviceDataPtr, uint8_t EpNum, uint8_t EpDir)
{
USB1_TDeviceData *DevDataPtr = (USB1_TDeviceData*)DeviceDataPtr;
USB1_TEpData *EpDataPtr;
USB1_TBD *BDPtr;
USB1_UsbLock(DevDataPtr);
EpDataPtr = &DevDataPtr->EpData[((uint32_t)EpNum << 0x01U)]; /* Get address of EPx data structure */
if (EpDataPtr->TransferType == LDD_USB_CONTROL) { /* Control EP? */
(EpDataPtr + 1)->EpState = (USB1_TePState)((uint32_t)((EpDataPtr +1 )->EpState) & ~(uint32)USB1_EP_STALLED);
} else {
if (EpDir != LDD_USB_DIR_OUT) {
EpDataPtr++;
}
BDPtr = EpDataPtr->BDPtr;
BDPtr->CtrlReg &= ~(USB1_BD_LE_STALL | USB1_BD_LE_DATA1); /* UNSTALL ODD BD entry, set data toggle to DATA0 */
(++BDPtr)->CtrlReg &= ~(USB1_BD_LE_STALL | USB1_BD_LE_DATA1); /* UNSTALL EVEN BD entry, set data toggle to DATA0 */
}
EpDataPtr->EpState = (USB1_TePState)((uint32_t)(EpDataPtr->EpState) & ~(uint32)USB1_EP_STALLED);
USB1_UsbUnlock(DevDataPtr);
}
