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 ClearUSBtoDefault(void) {
int i;
sof_handler = NULL;
class_setup_handler = NULL;
vendor_setup_handler = NULL;
SetUsbAddress(0); // After reset we don't have an address
ResetPPbuffers();
ClearAllUsbErrorInterruptFlags();
for (i = 0; i < MAX_CHIP_EP; i++) {
endpoints[i].out_handler = NULL;
endpoints[i].in_handler = NULL;
USB_UEP[i] = 0;
}
for (i = 0; i < (2 + 2 * MAX_EPNUM_USED); i++) {
usb_bdt[i].BDSTAT = 0;
}
USB_UEP0 = USB_EP_CONTROL; // Configure Only ep0 At this point.
//usbrequesterrorflag = 0;
#ifdef USB_SELF_POWERED
// JTR TODO this isn't actually 100% correct. "usb_device_status" is a runtime variable
// In the case of a bus powered device it will always be 0x000 but in the case of
// self powered with bus powered option it becames variable to the current powered
// State. This is a minor thing and for now but it may need to be addressed if there is
// any hardware that is dual powered.
usb_device_status = 0x0001;
#else
usb_device_status = 0x0000;
#endif
usb_device_state = DETACHED_STATE; // JTR added flag byte for enumeration state
usb_current_cfg = 0; // JTR formally usb_configured
usb_addr_pending = 0x00;
#if USB_PP_BUF_MODE == NO_PINGPONG
usb_bdt[USB_CALC_BD(0, USB_DIR_OUT, USB_PP_EVEN)].BDCNT = USB_EP0_BUFFER_SIZE; // JTR endpoints[0].buffer_size; same thing done more obviously
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 + DTSEN; // Set DTS => First packet inverts, ie. is Data0
#else
#error "Invalid PING_PONG mode"
#endif
}
void usb_init(ROMPTR const unsigned char *device_descriptor,
ROMPTR const unsigned char *config_descriptor,
ROMPTR const unsigned char *string_descriptor,
int num_string_descriptors) {
int i;
usb_device_descriptor = device_descriptor;
usb_config_descriptor = config_descriptor;
usb_string_descriptor = string_descriptor;
usb_num_string_descriptors = num_string_descriptors;
SetUsbAddress(0); // JTR added here. Probably not required though
ResetPPbuffers();
DisableUsbInterrupts();
DisableAllUsbInterrupts();
ClearAllUsbErrorInterruptFlags();
ClearAllUsbInterruptFlags();
ConfigureUsbHardware();
sof_handler = NULL;
class_setup_handler = NULL;
vendor_setup_handler = NULL;
for (i = 0; i < MAX_CHIP_EP; i++) {
endpoints[i].out_handler = NULL;
endpoints[i].in_handler = NULL;
}
// Register ep0 - no handlers
usb_unset_in_handler(0);
usb_unset_out_handler(0);
// JTR All UEPx SPRs are hard coded. I cannot see much point of tables or indexing for these.
// On the PIC16C765 such indexing was required for the STALL bit but now the STALL feature
// is in the Buffer descriptor table not in the UEPx SPRs.
// See changes to "USB_REQUEST_GET_STATUS"
// USB_UEP[0] = endpoints[0].type;
USB_UEP0 = USB_EP_CONTROL;
/* Configure endpoints TODO: Only ep0 ? */
// JTR Right! code for other end points snipped...At this point we are only setting up EP0
#ifdef USB_SELF_POWERED
usb_device_status = 0x0001;
#else
usb_device_status = 0x0000;
#endif
usb_device_state = 0x00; // JTR added flag byte for enumeration state
usb_current_cfg = 0; // JTR formally usb_configured
usb_addr_pending = 0x00;
#if USB_PP_BUF_MODE == 0
usb_bdt[USB_CALC_BD(0, USB_DIR_OUT, USB_PP_EVEN)].BDCNT = USB_EP0_BUFFER_SIZE; // JTR endpoints[0].buffer_size; same thing done more obviously
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
}
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();
}
void usb_handle_error(void) {
/* No errorhandler for now, just clear offending flag*/
ClearAllUsbErrorInterruptFlags();
}