/* Load the EP0 IN FIFO buffer with some data (zero-length works too). Returns
* len, or negative on error. */
int load_in_fifo(const void *source, uint32_t len)
{
uint8_t *buffer = ep0_in_buf;
int zero_packet = !len;
int d, l;
/* Copy the data into our FIFO buffer */
if (len >= IN_BUF_SIZE) {
report_error(len);
return -1;
}
if (len)
memcpy(buffer, source, len);
/* Set up the descriptors */
for (d = l = 0; len >= USB_MAX_PACKET_SIZE; d++) {
ep0_in_desc[d].addr = buffer + d * USB_MAX_PACKET_SIZE;
ep0_in_desc[d].flags = DIEPDMA_TXBYTES(USB_MAX_PACKET_SIZE);
len -= USB_MAX_PACKET_SIZE;
l = d;
}
/* Maybe one short packet left? */
if (len || zero_packet) {
ep0_in_desc[d].addr = buffer + d * USB_MAX_PACKET_SIZE;
ep0_in_desc[d].flags = DIEPDMA_TXBYTES(len) | DIEPDMA_SP;
l = d;
}
/* Mark the last descriptor as last. */
ep0_in_desc[l].flags |= (DIEPDMA_LAST | DIEPDMA_IOC);
/* Point to the first in the chain */
cur_in_desc = ep0_in_desc;
return len;
}
void set_keyboard_report(uint64_t rpt)
{
memcpy(hid_ep_buf, &rpt, sizeof(rpt));
hid_ep_desc.flags = DIEPDMA_LAST | DIEPDMA_BS_HOST_RDY | DIEPDMA_IOC |
DIEPDMA_TXBYTES(HID_REPORT_SIZE);
/* enable TX */
GR_USB_DIEPCTL(USB_EP_HID_KEYBOARD) |= DXEPCTL_CNAK | DXEPCTL_EPENA;
}
/* Let the USB HW IN-to-host FIFO transmit some bytes */
static void usb_enable_tx(struct usb_stream_config const *config, int len)
{
config->in_desc->flags = DIEPDMA_LAST | DIEPDMA_BS_HOST_RDY |
DIEPDMA_IOC | DIEPDMA_TXBYTES(len);
GR_USB_DIEPCTL(config->endpoint) |= DXEPCTL_CNAK | DXEPCTL_EPENA;
}
/* Let the USB HW IN-to-host FIFO transmit some bytes */
static void usb_enable_tx(int len)
{
ep_in_desc.flags = DIEPDMA_LAST | DIEPDMA_BS_HOST_RDY | DIEPDMA_IOC |
DIEPDMA_TXBYTES(len);
GR_USB_DIEPCTL(USB_EP_BLOB) |= DXEPCTL_CNAK | DXEPCTL_EPENA;
}
