// ----------------------------------------------------------------------
// Poll USB driver:
// - check for incoming USB packets
// - refill an empty transmit buffer
// - check for USB bus reset
// ----------------------------------------------------------------------
extern void usb_poll ( void )
{
byte_t i;
// check for incoming USB packets
if ( usb_rx_len != 0 )
{
usb_receive( usb_rx_buf + USB_BUFSIZE - usb_rx_off + 1, usb_rx_len - 3 );
usb_tx_len = 0; // abort pending transmission
usb_rx_len = 0; // accept next packet
}
// refill an empty transmit buffer, when the transmitter is active
if ( usb_tx_len == 0 )
{
if ( usb_tx_state != TX_STATE_IDLE )
{
usb_transmit();
}
else
{ // change the USB address at the end of a transfer
usb_address = new_address;
}
}
// check for USB bus reset
for ( i = 10; i > 0 && ! (USB_IN & USB_MASK_DMINUS); i-- )
{
}
if ( i == 0 )
{ // SE0 for more than 2.5uS is a reset
new_address = 0;
}
}
// ----------------------------------------------------------------------
// Poll USB driver:
// - check for incoming USB packets
// - refill an empty transmit buffer
// - check for USB bus reset
// ----------------------------------------------------------------------
extern void usb_poll ( void )
{
byte_t i;
// check for incoming USB packets
if ( usb_rx_len != 0 )
{
usb_receive( usb_rx_buf + USB_BUFSIZE - usb_rx_off + 1, usb_rx_len - 3 );
usb_tx_len = 0; // abort pending transmission
usb_rx_len = 0; // accept next packet
}
// refill an empty transmit buffer, when the transmitter is active
if ( usb_tx_len == 0 && usb_tx_state != TX_STATE_IDLE )
{
usb_transmit();
}
// check for USB bus reset
for ( i = 10; i > 0 && ! (USB_IN & USB_MASK_DMINUS); i-- )
{
}
if ( i == 0 )
{ // SE0 for more than 2.5uS is a reset
usb_new_address = 0;
usb_address = 0;
#ifdef USBTINY_USB_OK_LED
CLR(USBTINY_USB_OK_LED); // LED off
#endif
}
}
