//
// USB interrupt handler
//
static void usbISR_Handler (void)
{
U32 dwStatus;
U32 dwIntBit;
U32 dwEpIntSt, dwIntMask;
U8 bEPStat, bDevStat, bStat;
U16 wFrame;
int i;
portBASE_TYPE higherPriorityTaskWoken = pdFALSE;
dwStatus = USB_DevIntSt;
if (dwStatus & USB_DevIntSt_FRAME)
{
USB_DevIntClr = USB_DevIntClr_FRAME;
if (_pfnFrameHandler != NULL)
{
wFrame = usbHardwareCommandRead (CMD_DEV_READ_CUR_FRAME_NR);
_pfnFrameHandler (wFrame);
}
}
if (dwStatus & USB_DevIntSt_DEVSTAT)
{
USB_DevIntClr = USB_DevIntClr_DEVSTAT;
bDevStat = usbHardwareCommandRead (CMD_DEV_STATUS);
if (bDevStat & (CON_CH | SUS_CH | RST))
{
bStat = ((bDevStat & CON) ? DEV_STATUS_CONNECT : 0) |
((bDevStat & SUS) ? DEV_STATUS_SUSPEND : 0) |
((bDevStat & RST) ? DEV_STATUS_RESET : 0);
if (_pfnDevIntHandler != NULL)
_pfnDevIntHandler (bStat);
}
}
if (dwStatus & USB_DevIntSt_EPSLOW)
{
USB_DevIntClr = USB_DevIntClr_EPSLOW;
dwIntMask = 0xffffffff;
for (i = 0; i < 32; i++)
{
dwIntBit = (1 << i);
dwIntMask <<= 1;
dwEpIntSt = USB_EpIntSt;
if (dwEpIntSt & dwIntBit)
{
USB_EpIntClr = dwIntBit;
usbWaitForDeviceInterrupt (USB_DevIntSt_CDFULL);
bEPStat = USB_CmdData;
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);
if (_apfnEPIntHandlers [i / 2])
higherPriorityTaskWoken |= _apfnEPIntHandlers [i / 2] (IDX2EP (i), bStat);
}
if (!(dwEpIntSt & dwIntMask))
break;
}
}
VIC_VectAddr = (unsigned portLONG) 0;
if (higherPriorityTaskWoken)
portYIELD_FROM_ISR ();
}
/**
USB interrupt handler
@todo Get all 11 bits of frame number instead of just 8
Endpoint interrupts are mapped to the slow interrupt
*/
void USBHwISR(void)
{
unsigned long dwStatus;
unsigned long dwIntBit;
unsigned char bEPStat, bDevStat, bStat;
int i;
unsigned short 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
if (_pfnDevIntHandler != NULL) {
_pfnDevIntHandler(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);
}
}
}
}
}
