VOID
HandleDeviceEvent (
WDFDEVICE WdfDevice,
DEVICE_EVENT DeviceEvent
)
/*++
Routine Description:
Function to dispatch device events from the controller.
Arguments:
WdfDevice - Wdf device object corresponding to the FDO
DeviceEvent - Device specific event.
--*/
{
PCONTROLLER_CONTEXT ControllerContext;
TraceEntry();
ControllerContext = DeviceGetControllerContext(WdfDevice);
switch (DeviceEvent) {
case DeviceEventDisconnect:
ControllerContext->Suspended = FALSE;
HandleUsbDisconnect(WdfDevice);
break;
case DeviceEventUSBReset:
ControllerContext->Suspended = FALSE;
HandleUsbReset(WdfDevice);
break;
case DeviceEventConnect:
HandleUsbConnect(WdfDevice);
break;
case DeviceEventUSBLinkStateChange:
HandleUSBLinkStateChange(WdfDevice);
break;
case DeviceEventWakeUp:
if (ControllerContext->Suspended) {
ControllerContext->Suspended = FALSE;
UfxDeviceNotifyResume(ControllerContext->UfxDevice);
}
break;
case DeviceEventSuspend:
if (!ControllerContext->Suspended) {
ControllerContext->Suspended = TRUE;
UfxDeviceNotifySuspend(ControllerContext->UfxDevice);
}
break;
default:
TraceError("Unknown device event raised by controller");
NT_ASSERT(FALSE);
break;
}
TraceExit();
}
/**
USB interrupt handler
@todo Get all 11 bits of frame number instead of just 8
Endpoint interrupts are mapped to the slow interrupt
*/
void USB_IRQHandler(void)
{
uint32_t dwStatus;
uint32_t dwIntBit;
uint8_t bEPStat, bDevStat, bStat;
int i;
uint16_t wFrame;
// handle device interrupts
dwStatus = LPC_USB->USBDevIntSt;
// frame interrupt
if (dwStatus & FRAME) {
// clear int
LPC_USB->USBDevIntClr = FRAME;
// call handler
if (_pfnFrameHandler != NULL) {
wFrame = USBHwCmdRead(CMD_DEV_READ_CUR_FRAME_NR);
_pfnFrameHandler(wFrame);
}
}
// device status interrupt
if (dwStatus & DEV_STAT) {
/* Clear DEV_STAT interrupt before reading DEV_STAT register.
This prevents corrupted device status reads, see
LPC2148 User manual revision 2, 25 july 2006.
*/
LPC_USB->USBDevIntClr = DEV_STAT;
bDevStat = USBHwCmdRead(CMD_DEV_STATUS);
if (bDevStat & (CON_CH | SUS_CH | RST)) {
// convert device status into something HW independent
bStat = ((bDevStat & CON) ? DEV_STATUS_CONNECT : 0) |
((bDevStat & SUS) ? DEV_STATUS_SUSPEND : 0) |
((bDevStat & RST) ? DEV_STATUS_RESET : 0);
// call handler
HandleUsbReset(bStat);
}
}
// endpoint interrupt
if (dwStatus & EP_SLOW) {
// clear EP_SLOW
LPC_USB->USBDevIntClr = EP_SLOW;
// check all endpoints
for (i = 0; i < 32; i++) {
dwIntBit = (1 << i);
if (LPC_USB->USBEpIntSt & dwIntBit) {
// clear int (and retrieve status)
LPC_USB->USBEpIntClr = dwIntBit;
Wait4DevInt(CDFULL);
bEPStat = LPC_USB->USBCmdData;
// convert EP pipe stat into something HW independent
bStat = ((bEPStat & EPSTAT_FE) ? EP_STATUS_DATA : 0) |
((bEPStat & EPSTAT_ST) ? EP_STATUS_STALLED : 0) |
((bEPStat & EPSTAT_STP) ? EP_STATUS_SETUP : 0) |
((bEPStat & EPSTAT_EPN) ? EP_STATUS_NACKED : 0) |
((bEPStat & EPSTAT_PO) ? EP_STATUS_ERROR : 0);
// call handler
if (_apfnEPIntHandlers[i / 2] != NULL) {
_apfnEPIntHandlers[i / 2](IDX2EP(i), bStat);
}
}
}
}
}