bool udd_ep_run(udd_ep_id_t ep, bool b_shortpacket,
uint8_t * buf, iram_size_t buf_size,
udd_callback_trans_t callback)
{
udd_ep_job_t *ptr_job;
irqflags_t flags;
bool b_dir_in = ep & USB_EP_DIR_IN;
ep &= USB_EP_ADDR_MASK;
if (USB_DEVICE_MAX_EP < ep) {
return false;
}
// Get job about endpoint
ptr_job = &udd_ep_job[ep - 1];
if ((!Is_udd_endpoint_enabled(ep))
|| ptr_job->b_stall_requested
|| Is_udd_endpoint_stall_requested(ep)) {
return false; // Endpoint is halted
}
flags = cpu_irq_save();
if (ptr_job->busy == true) {
cpu_irq_restore(flags);
return false; // Job already on going
}
ptr_job->busy = true;
cpu_irq_restore(flags);
// No job running. Let's setup a new one.
ptr_job->buf = buf;
ptr_job->buf_size = buf_size;
ptr_job->buf_cnt = 0;
ptr_job->call_trans = callback;
ptr_job->b_shortpacket = b_shortpacket || (buf_size == 0);
ptr_job->b_buf_end = false;
flags = cpu_irq_save();
udd_enable_endpoint_interrupt(ep);
// Request first transfer
if (b_dir_in) {
if (Is_udd_in_pending(ep)) {
// Append more data (handled in interrupt service)
} else {
// Start new, try to fill 1~2 banks before handling status
if (udd_ep_in_sent(ep, true)) {
// Over one bank
udd_ep_in_sent(ep, false);
} else {
// Less than one bank
}
}
} else {
// Waiting for OUT received interrupt
}
cpu_irq_restore(flags);
return true;
}
static bool udd_ep_interrupt(void)
{
udd_ep_id_t ep;
udd_ep_job_t *ptr_job;
// For each endpoint different of control endpoint (0)
for (ep = 1; ep <= USB_DEVICE_MAX_EP; ep++) {
// Check RXRDY and TXEMPTY event for none DMA endpoints
if (!Is_udd_endpoint_interrupt_enabled(ep)) {
continue;
}
// Get job corresponding at endpoint
ptr_job = &udd_ep_job[ep - 1];
// RXOUT: Full packet received
if (Is_udd_any_bank_received(ep)) {
udd_ep_out_received(ep);
return true;
}
// TXIN: packet sent
if (Is_udd_in_sent(ep)) {
ptr_job->bank--;
// Stall when all banks free
if (ptr_job->b_stall_requested) {
if (ptr_job->bank) {
// Send remaining
udd_set_transmit_ready(ep);
udd_ack_in_sent(ep);
} else {
// Ack last packet
udd_ack_in_sent(ep);
// Enable stall
udd_enable_stall_handshake(ep);
// Halt executed
ptr_job->b_stall_requested = false;
}
return true;
}
// Finish Job when buffer end
if (ptr_job->b_buf_end) {
ptr_job->b_buf_end = false;
ptr_job->buf_size = ptr_job->buf_cnt; // buf_size is passed to callback as XFR count
udd_ep_finish_job(ptr_job, UDD_EP_TRANSFER_OK, ep);
}
if (ptr_job->buf_cnt >= ptr_job->buf_size &&
!ptr_job->b_shortpacket &&
ptr_job->bank == 0) {
// All transfer done, including ZLP
irqflags_t flags = cpu_irq_save();
udd_disable_endpoint_interrupt(ep);
cpu_irq_restore(flags);
// Ack last packet
udd_ack_in_sent(ep);
return true;
} else if (udd_get_endpoint_bank_max_nbr(ep) > 1
&& ptr_job->bank > 0) {
// Already banks buffered, transmit while loading
udd_set_transmit_ready(ep);
udd_ack_in_sent(ep);
udd_ep_in_sent(ep, false);
} else if (udd_get_endpoint_bank_max_nbr(ep) > 1) {
// Still bank free, load and transmit
if (!udd_ep_in_sent(ep, true)) {
ptr_job->b_buf_end = false;
ptr_job->buf_size = ptr_job->buf_cnt; // buf_size is passed to callback as XFR count
udd_ep_finish_job(ptr_job, UDD_EP_TRANSFER_OK, ep);
}
udd_ack_in_sent(ep);
udd_ep_in_sent(ep, false);
} else {
// Single bank transfer, ack when ready
udd_ep_in_sent(ep, true);
udd_ack_in_sent(ep);
}
return true;
}
// Stall sent/CRC error
if (Is_udd_stall(ep)) {
udd_ack_stall(ep);
if (udd_get_endpoint_type(ep) == UDP_CSR_EPTYPE_ISO_OUT ||
udd_get_endpoint_type(ep) == UDP_CSR_EPTYPE_ISO_IN) {
}
return true;
}
}
return false;
}
