int_fast8_t
usb_read_ep0_setup(void *data, uint_fast8_t max_len)
{
UENUM = 0;
uint8_t ueintx = UEINTX;
if (!(ueintx & ((1<<RXSTPI)))) {
// No data ready to read
UEIENX = 1<<RXSTPE;
return -1;
}
usb_read_packet(data, max_len);
UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI));
return max_len;
}
int_fast8_t
usb_read_bulk_out(void *data, uint_fast8_t max_len)
{
UENUM = USB_CDC_EP_BULK_OUT;
if (!(UEINTX & (1<<RXOUTI))) {
// No data ready
UEIENX = 1<<RXOUTE;
return -1;
}
uint8_t len = UEBCLX;
usb_read_packet(data, len);
UEINTX = (uint8_t)~((1<<FIFOCON) | (1<<RXOUTI));
return len;
}
int_fast8_t
usb_read_ep0(void *data, uint_fast8_t max_len)
{
UENUM = 0;
uint8_t ueintx = UEINTX;
if (ueintx & (1<<RXSTPI))
return -2;
if (!(ueintx & (1<<RXOUTI))) {
// Not ready to receive data
UEIENX = (1<<RXSTPE) | (1<<RXOUTE);
return -1;
}
usb_read_packet(data, max_len);
if (UEINTX & (1<<RXSTPI))
return -2;
UEINTX = ~(1<<RXOUTI);
return max_len;
}
int_fast8_t
usb_read_setup(void *data, uint_fast8_t max_len)
{
return usb_read_packet(0, 0, data, max_len);
}
int_fast8_t
usb_read_bulk_out(void *data, uint_fast8_t max_len)
{
return usb_read_packet(USB_CDC_EP_BULK_OUT, 0, data, max_len);
}
