static void udd_ctrl_send_zlp_in(void)
{
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP;
// Valid and sent empty IN packet on control endpoint
udd_control_in_set_bytecnt(0);
udd_control_in_clear_NACK0();
}
static void udd_ctrl_in_sent(void)
{
static bool b_shortpacket = false;
uint16_t nb_remain;
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// ZLP on IN is sent, then valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_IN);
nb_remain = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
if (0 == nb_remain) {
// Update number of total data sending by previous playload buffer
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
if ((udd_g_ctrlreq.req.wLength == udd_ctrl_prev_payload_nb_trans)
|| b_shortpacket) {
// All data requested are transfered or a short packet has been sent
// then it is the end of data phase.
// Generate an OUT ZLP for handshake phase.
udd_ctrl_send_zlp_out();
return;
}
// Need of new buffer because the data phase is not complete
if ((!udd_g_ctrlreq.over_under_run)
|| (!udd_g_ctrlreq.over_under_run())) {
// Underrun then send zlp on IN
// nb_remain == 0 allows to send a IN ZLP
} else {
// A new payload buffer is given
udd_ctrl_payload_nb_trans = 0;
nb_remain = udd_g_ctrlreq.payload_size;
}
}
// Continue transfer an send next data
if (nb_remain >= USB_DEVICE_EP_CTRL_SIZE) {
nb_remain = USB_DEVICE_EP_CTRL_SIZE;
b_shortpacket = false;
} else {
b_shortpacket = true;
}
udd_control_in_set_bytecnt(nb_remain);
// Link payload buffer directly on USB hardware
udd_control_in_set_buf(udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans);
udd_ctrl_payload_nb_trans += nb_remain;
// Valid and sent the data available in control endpoint buffer
udd_control_in_clear_NACK0();
}
static void udd_ctrl_init(void)
{
udd_disable_overflow_interrupt();
udd_disable_underflow_interrupt();
// Clear status flag from control endpoints
// Mandatory for ATxmega128A1 Rev. K
udd_control_in_set_NACK0();
udd_control_in_set_bytecnt(0);
udd_control_in_ack_tc();
udd_control_ack_in_underflow();
udd_control_ack_out_overflow();
udd_g_ctrlreq.callback = NULL;
udd_g_ctrlreq.over_under_run = NULL;
udd_g_ctrlreq.payload_size = 0;
udd_ep_control_state = UDD_EPCTRL_SETUP;
}
