bool udd_ep_set_halt(udd_ep_id_t ep)
{
udd_ep_job_t *ptr_job;
uint8_t index = ep & USB_EP_ADDR_MASK;
if (USB_DEVICE_MAX_EP < index) {
return false;
}
ptr_job = &udd_ep_job[index - 1];
if (Is_udd_endpoint_stall_requested(index) // Endpoint stalled
|| ptr_job->stall_requested) { // Endpoint stall is requested
return true; // Already STALL
}
if (ptr_job->busy == true) {
return false; // Job on going, stall impossible
}
if ((ep & USB_EP_DIR_IN) && (0 != udd_nb_busy_bank(index))) {
// Delay the stall after the end of IN transfer on USB line
ptr_job->stall_requested = true;
udd_enable_bank_interrupt(index);
udd_enable_endpoint_interrupt(index);
return true;
}
// Stall endpoint immediately
udd_disable_endpoint_bank_autoswitch(index);
udd_ack_stall(index);
udd_enable_stall_handshake(index);
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 DMA event
if (Is_udd_endpoint_dma_interrupt_enabled(ep)
&& Is_udd_endpoint_dma_interrupt(ep)) {
uint32_t nb_remaining;
udd_disable_endpoint_dma_interrupt(ep);
// Save number of data no transfered
nb_remaining = (udd_endpoint_dma_get_status(ep) &
AVR32_USBB_UDDMA1_STATUS_CH_BYTE_CNT_MASK)
>>
AVR32_USBB_UDDMA1_STATUS_CH_BYTE_CNT_OFFSET;
// Get job corresponding at endpoint
ptr_job = &udd_ep_job[ep - 1];
// Update number of data transfered
ptr_job->buf_size -= nb_remaining;
if (!Is_udd_endpoint_in(ep)) {
// Disable autoswitch bank on OUT
udd_disable_endpoint_bank_autoswitch(ep);
} else {
// Wait end of background transfer on IN endpoint before disabled autoswitch bank
udd_enable_endpoint_interrupt(ep);
udd_enable_bank_interrupt(ep);
}
// Call callback to signal end of transfer
udd_ep_finish_job(&udd_ep_job[ep - 1], false);
return true;
}
// Check empty bank interrupt event
if (Is_udd_endpoint_interrupt_enabled(ep)
&& (0 == udd_nb_busy_bank(ep))) {
// End of background transfer on IN endpoint
udd_disable_bank_interrupt(ep);
udd_disable_endpoint_interrupt(ep);
// If no new transfer running then disable autoswitch bank
if (!udd_ep_job[ep - 1].busy) {
udd_disable_endpoint_bank_autoswitch(ep);
}
// If a stall has been requested during backgound transfer then execute it
if (udd_ep_job[ep - 1].stall_requested) {
udd_ep_job[ep - 1].stall_requested = false;
udd_enable_stall_handshake(ep);
udd_reset_data_toggle(ep);
}
return true;
}
}
