void usb_handle_reset(void) {
do {
ClearUsbInterruptFlag(USB_TRN); // JTR corrected Must poll TRN Flag and clear, then wait 6 cycles. for next flag set.
usb_current_cfg = 0;
usb_device_state = DEFAULT_STATE; // This BLOCK creates the requied 6 cycle delay for TRNF to reassert.
usb_addr_pending = 0x00;
} while (USB_TRANSACTION_FLAG);
ClearUSBtoDefault();
EnablePacketTransfer();
}
BYTE FAST_usb_handler(void) {
if (TestGlobalUsbInterruptFlag()) {
if (USB_RESET_FLAG) {
usb_handle_reset();
ClearUsbInterruptFlag(USB_URST);
return 0xFF;
}
if (USB_TRANSACTION_FLAG) {
trn_status = GetUsbTransaction();
if (USB_STAT2EP(trn_status)) {
usb_handle_transaction();
ClearUsbInterruptFlag(USB_TRN); // non-EP0 only
return 0xFF;
} else {
ClearUsbInterruptFlag(USB_TRN); // non-EP0 only
}
}
ClearGlobalUsbInterruptFlag();
}
return 0;
}
void usb_handler(void) {
if (USB_IDLE_FLAG) {
/* Idle - suspend */
USBSuspend(); // // Must be defined in user code.
ClearUsbInterruptFlag(USB_IDLE);
}
if (USB_RESET_FLAG) {
usb_handle_reset();
ClearUsbInterruptFlag(USB_URST);
}
if (USB_ERROR_FLAG) {
// usb_handle_error();
ClearAllUsbErrorInterruptFlags();
ClearUsbInterruptFlag(USB_UERR);
}
if (USB_STALL_FLAG) {
ClearUsbInterruptFlag(USB_STALL);
}
if (USB_SOF_FLAG) {
/* Start-of-frame */
if (sof_handler) sof_handler();
ClearUsbInterruptFlag(USB_SOF);
}
if (USB_TRANSACTION_FLAG) {
if (!USB_STAT2EP(GetUsbTransaction()))
usb_handle_transaction(); // Only handle EP0 transactions.
ClearUsbInterruptFlag(USB_TRN); // JTR Missing! This is why Ian was only getting one interrupt??
} // Side effect: advance USTAT Fifo
}
void usb_handler(void) {
if (USB_RESET_FLAG) {
usb_handle_reset();
ClearUsbInterruptFlag(USB_URST);
} else if (USB_ERROR_FLAG) {
usb_handle_error();
ClearUsbInterruptFlag(USB_UERR);
} else if (USB_ACTIVITY_FLAG) {
/* Activity - unsuspend */
//WakeupUsb();
ClearUsbInterruptFlag(USB_ACTIV);
} else if (USB_IDLE_FLAG) {
/* Idle - suspend */
//SuspendUsb();
//usb_low_power_request();
ClearUsbInterruptFlag(USB_IDLE);
} else if (USB_STALL_FLAG) {
/* Stall detected
* Not sure when this interrupt fires
* as the host never should send out a stall.
* Perhaps as a respons to our own stalls?
* For now just ignore it. */
ClearUsbInterruptFlag(USB_STALL);
} else if (USB_SOF_FLAG) {
/* Start-of-frame */
//if (sof_handler) sof_handler();
{
ClearUsbInterruptFlag(USB_SOF);
}
} else {
// process all pending transactions
while (USB_TRANSACTION_FLAG) {
usb_handle_transaction();
ClearUsbInterruptFlag(USB_TRN);
} // Side effect: advance USTAT Fifo
}
}
void usb_handle_reset(void) {
int i;
mLedToggle();
#ifdef USB_SELF_POWERED // JTR see note about this in usb_init()
usb_device_status = 0x0001;
#else
usb_device_status = 0x0000;
#endif
do {
ClearUsbInterruptFlag(USB_TRN); // JTR corrected Must poll TRN Flag and clear, then wait 6 cycles. for next flag set.
usb_current_cfg = 0;
usb_device_state = 0x00; // This creates the requied 6 cycle delay for TRNF to reassert.
usb_addr_pending = 0x00;
} while (USB_TRANSACTION_FLAG);
// for (i=0; i < MAX_CHIP_EP; i++ ) // JTR this loop seems to work proving that the USB_UEP ptr is now correct.
// {
// USB_UEP[i] = 0; // JTR Char on PIC18 and int ptr on PIC24
// }
USB_UEP0 = 0; // Disable all endpoints
USB_UEP1 = 0;
USB_UEP2 = 0;
USB_UEP3 = 0;
USB_UEP4 = 0;
USB_UEP5 = 0;
USB_UEP6 = 0;
USB_UEP7 = 0;
#if MAX_CHIP_EP > 8 // JTR alteration
USB_UEP8 = 0;
USB_UEP9 = 0;
USB_UEP10 = 0;
USB_UEP11 = 0;
USB_UEP12 = 0;
USB_UEP13 = 0;
USB_UEP14 = 0;
USB_UEP15 = 0;
#endif
SetUsbAddress(0); // After reset we don't have an address
ClearAllUsbInterruptFlags();
ClearAllUsbErrorInterruptFlags();
// JTR added. Clear all BD STAT registers so that they are owned by the CPU and it is safe to change them.
for (i = 0; i < (2 + 2 * MAX_EPNUM_USED); i += 4) {
usb_bdt[i].BDSTAT = 0;
}
// USB_UEP[0] = endpoints[0].type; // JTR removed all such indexing on UEPx
USB_UEP0 = USB_EP_CONTROL; // JTR hard coded instead.
/* Configure buffer descriptors */
#if USB_PP_BUF_MODE == 0
usb_bdt[USB_CALC_BD(0, USB_DIR_OUT, USB_PP_EVEN)].BDCNT = USB_EP0_BUFFER_SIZE; //endpoints[0].buffer_size;
usb_bdt[USB_CALC_BD(0, USB_DIR_OUT, USB_PP_EVEN)].BDADDR = usb_ep0_out_buf; //endpoints[0].out_buffer;
usb_bdt[USB_CALC_BD(0, USB_DIR_OUT, USB_PP_EVEN)].BDSTAT = UOWN + DTSEN;
usb_bdt[USB_CALC_BD(0, USB_DIR_IN, USB_PP_EVEN)].BDCNT = 0;
usb_bdt[USB_CALC_BD(0, USB_DIR_IN, USB_PP_EVEN)].BDADDR = usb_ep0_in_buf; //endpoints[0].in_buffer;
usb_bdt[USB_CALC_BD(0, USB_DIR_IN, USB_PP_EVEN)].BDSTAT = DTS; // Set DTS => First packet inverts, ie. is Data0
#else
// TODO: Implement Ping-Pong buffering setup.
#error "PP Mode not implemented yet"
#endif
EnablePacketTransfer();
}
