static bool udd_ctrl_interrupt(void)
{
if (!Is_udd_endpoint_interrupt(0))
return false; // No interrupt events on control endpoint
// Search event on control endpoint
if (Is_udd_setup_received(0)) {
// SETUP packet received
udd_ctrl_setup_received();
return true;
}
if (Is_udd_in_sent(0)) {
// IN packet sent
udd_ctrl_in_sent();
return true;
}
if (Is_udd_bank0_received(0)) {
// OUT packet received
udd_ctrl_out_received();
return true;
}
if (Is_udd_stall(0)) {
// STALLed
udd_ack_stall(0);
return true;
}
return false;
}
static void udd_ep_ack_out_received(udd_ep_id_t ep)
{
bool bank0_received, bank1_received;
udd_ep_job_t *ptr_job = &udd_ep_job[ep - 1];
bank0_received = Is_udd_bank0_received(ep);
bank1_received = Is_udd_bank1_received(ep);
if (bank0_received && bank1_received) {
// The only way is to use ptr_job->bank
} else if (bank0_received) {
// Must be bank0
ptr_job->bank = 0;
} else {
// Must be bank1
ptr_job->bank = 1;
}
if (ptr_job->bank == 0) {
udd_ack_bank0_received(ep);
if (udd_get_endpoint_bank_max_nbr(ep) > 1) {
ptr_job->bank = 1;
}
} else {
udd_ack_bank1_received(ep);
ptr_job->bank = 0;
}
}
static void udd_ctrl_in_sent(void)
{
static bool b_shortpacket = false;
uint16_t nb_remain;
uint8_t i;
uint8_t *ptr_src;
irqflags_t flags;
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// Ack
udd_ack_in_sent(0);
// 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) {
// All content of current buffer payload are sent
// Update number of total data sending by previous payload 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();
udd_ack_in_sent(0);
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
// Here nb_remain=0 and 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 and 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;
}
// Fill buffer of endpoint control
ptr_src = udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans;
//** Critical section
// Only in case of DATA IN phase abort without USB Reset signal after.
// The IN data don't must be written in endpoint 0 DPRAM during
// a next setup reception in same endpoint 0 DPRAM.
// Thereby, an OUT ZLP reception must check before IN data write
// and if no OUT ZLP is received the data must be written quickly (800us)
// before an eventually ZLP OUT and SETUP reception
flags = cpu_irq_save();
if (Is_udd_bank0_received(0)) {
// IN DATA phase aborted by OUT ZLP
cpu_irq_restore(flags);
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP;
udd_ack_in_sent(0);
return; // Exit of IN DATA phase
}
// Write quickly the IN data
for (i = 0; i < nb_remain; i++) {
udd_endpoint_fifo_write(0, *ptr_src++);
}
udd_ctrl_payload_nb_trans += nb_remain;
// Validate and send the data available in the control endpoint buffer
udd_set_transmit_ready(0);
udd_ack_in_sent(0);
// In case of abort of DATA IN phase, no need to enable nak OUT interrupt
// because OUT endpoint is already free and ZLP OUT accepted.
cpu_irq_restore(flags);
}
