static void usbReset(void) {
pInformation->Current_Configuration = 0;
/* current feature is current bmAttributes */
pInformation->Current_Feature = (USB_CONFIG_ATTR_BUSPOWERED |
USB_CONFIG_ATTR_SELF_POWERED);
USB_BASE->BTABLE = BTABLE_ADDRESS;
/* setup control endpoint 0 */
usb_set_ep_type(USB_EP0, USB_EP_EP_TYPE_CONTROL);
usb_set_ep_tx_stat(USB_EP0, USB_EP_STAT_TX_STALL);
usb_set_ep_rx_addr(USB_EP0, USB_MIDI_CTRL_RX_ADDR);
usb_set_ep_tx_addr(USB_EP0, USB_MIDI_CTRL_TX_ADDR);
usb_clear_status_out(USB_EP0);
usb_set_ep_rx_count(USB_EP0, pProperty->MaxPacketSize);
usb_set_ep_rx_stat(USB_EP0, USB_EP_STAT_RX_VALID);
/* TODO figure out differences in style between RX/TX EP setup */
/* set up data endpoint OUT (RX) */
usb_set_ep_type(USB_MIDI_RX_ENDP, USB_EP_EP_TYPE_BULK);
usb_set_ep_rx_addr(USB_MIDI_RX_ENDP, USB_MIDI_RX_ADDR);
usb_set_ep_rx_count(USB_MIDI_RX_ENDP, USB_MIDI_RX_EPSIZE);
usb_set_ep_rx_stat(USB_MIDI_RX_ENDP, USB_EP_STAT_RX_VALID);
/* set up data endpoint IN (TX) */
usb_set_ep_type(USB_MIDI_TX_ENDP, USB_EP_EP_TYPE_BULK);
usb_set_ep_tx_addr(USB_MIDI_TX_ENDP, USB_MIDI_TX_ADDR);
usb_set_ep_tx_stat(USB_MIDI_TX_ENDP, USB_EP_STAT_TX_NAK);
usb_set_ep_rx_stat(USB_MIDI_TX_ENDP, USB_EP_STAT_RX_DISABLED);
USBLIB->state = USB_ATTACHED;
SetDeviceAddress(0);
/* Reset the RX/TX state */
n_unread_packets = 0;
n_unsent_packets = 0;
rx_offset = 0;
tx_offset = 0;
transmitting = 0;
}
static void midiDataRxCb(void) {
usb_set_ep_rx_stat(USB_MIDI_RX_ENDP, USB_EP_STAT_RX_NAK);
n_unread_packets = usb_get_ep_rx_count(USB_MIDI_RX_ENDP) / 4;
/* This copy won't overwrite unread bytes, since we've set the RX
* endpoint to NAK, and will only set it to VALID when all bytes
* have been read. */
usb_copy_from_pma((uint8*)midiBufferRx, n_unread_packets * 4,
USB_MIDI_RX_ADDR);
if (n_unread_packets == 0) {
usb_set_ep_rx_count(USB_MIDI_RX_ENDP, USB_MIDI_RX_EPSIZE);
usb_set_ep_rx_stat(USB_MIDI_RX_ENDP, USB_EP_STAT_RX_VALID);
rx_offset = 0;
}
}
/* Nonblocking byte receive.
*
* Copies up to len bytes from our private data buffer (*NOT* the PMA)
* into buf and deq's the FIFO. */
uint32 usb_midi_rx(uint32* buf, uint32 packets) {
/* Copy bytes to buffer. */
uint32 n_copied = usb_midi_peek(buf, packets);
/* Mark bytes as read. */
n_unread_packets -= n_copied;
rx_offset += n_copied;
/* If all bytes have been read, re-enable the RX endpoint, which
* was set to NAK when the current batch of bytes was received. */
if (n_unread_packets == 0) {
usb_set_ep_rx_count(USB_MIDI_RX_ENDP, USB_MIDI_RX_EPSIZE);
usb_set_ep_rx_stat(USB_MIDI_RX_ENDP, USB_EP_STAT_RX_VALID);
rx_offset = 0;
}
return n_copied;
}
static inline void set_rx_tx_status0(uint16 rx, uint16 tx) {
usb_set_ep_rx_stat(USB_EP0, rx);
usb_set_ep_tx_stat(USB_EP0, tx);
}