static void udd_ctrl_setup_received(void)
{
if (UDD_EPCTRL_SETUP != udd_ep_control_state) {
if ((UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state)
|| (UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP == udd_ep_control_state)) {
// Accept that ZLP event can be hidden by setup packet event
// in case of setup packet sending quickly after a ZLP
udd_ctrl_endofrequest();
}
// Reinitializes control endpoint management
udd_ctrl_init();
}
// Fill setup request structure
if (8 != udd_control_out_get_bytecnt())
return; // Error data number don't correspond to SETUP packet
memcpy((uint8_t *) & udd_g_ctrlreq.req, udd_ctrl_buffer, 8);
// To detect a protocol error on setup, enable nak interrupt on IN/OUT of control endpoint
udd_enable_overflow_interrupt();
udd_enable_underflow_interrupt();
// Decode setup request
if (udc_process_setup() == false) {
// Setup request unknown then stall it
udd_ctrl_stall_data();
return;
}
if (Udd_setup_is_in()) {
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_IN;
udd_ctrl_in_sent(); // Send first data transfer
} else {
if (0 == udd_g_ctrlreq.req.wLength) {
// No data phase requested
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
// OUT data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_OUT;
// Clear packet to receive first packet
udd_control_out_clear_NACK0();
udd_control_out_ack_tc();
}
}
static void udd_ctrl_send_zlp_out(void)
{
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP;
// Valid reception of OUT packet on control endpoint
udd_control_out_clear_NACK0();
}
static void udd_ctrl_out_received(void)
{
uint16_t nb_data;
if (UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP == udd_ep_control_state) {
// Valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_OUT);
// Read data received during OUT phase
nb_data = udd_control_out_get_bytecnt();
if (udd_g_ctrlreq.payload_size < (udd_ctrl_payload_nb_trans + nb_data)) {
// Payload buffer too small, ignore data remaining
nb_data = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
}
memcpy((uint8_t *) (udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans),
udd_ctrl_buffer, nb_data);
udd_ctrl_payload_nb_trans += nb_data;
if ((USB_DEVICE_EP_CTRL_SIZE != nb_data) || (udd_g_ctrlreq.req.wLength
<= (udd_ctrl_prev_payload_nb_trans
+ udd_ctrl_payload_nb_trans))) {
// End of reception because it is a short packet
// or all data are transfered
// Before send ZLP, call intermediate callback
// in case of data receive generate a stall
udd_g_ctrlreq.payload_size = udd_ctrl_payload_nb_trans;
if (NULL != udd_g_ctrlreq.over_under_run) {
if (!udd_g_ctrlreq.over_under_run()) {
// Stall ZLP
udd_ctrl_stall_data();
return;
}
}
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
if (udd_g_ctrlreq.payload_size == udd_ctrl_payload_nb_trans) {
// Overrun then request a new payload buffer
if (!udd_g_ctrlreq.over_under_run) {
// No callback available to request a new payload buffer
udd_ctrl_stall_data();
return;
}
if (!udd_g_ctrlreq.over_under_run()) {
// No new payload buffer delivered
udd_ctrl_stall_data();
return;
}
// New payload buffer available
// Update number of total data received
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
// Reinit reception on payload buffer
udd_ctrl_payload_nb_trans = 0;
}
// Free buffer of OUT control endpoint to authorize next reception
udd_control_out_clear_NACK0();
}
