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++) {
// Get job corresponding at endpoint
ptr_job = &udd_ep_job[ep - 1];
// Check DMA event
if (Is_udd_endpoint_dma_interrupt_enabled(ep)
&& Is_udd_endpoint_dma_interrupt(ep)) {
uint32_t nb_remaining;
if( udd_endpoint_dma_get_status(ep)
& AVR32_USBB_UDDMA1_STATUS_CH_EN_MASK) {
return true; // Ignore EOT_STA interrupt
}
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;
if (nb_remaining) {
// Transfer no complete (short packet or ZLP) then:
// Update number of data transfered
ptr_job->nb_trans -= nb_remaining;
// Set transfer complete to stop the transfer
ptr_job->buf_size = ptr_job->nb_trans;
}
udd_ep_trans_done(ep);
return true;
}
// Check empty bank interrupt event
if (Is_udd_endpoint_interrupt_enabled(ep)) {
if (Is_udd_in_send_interrupt_enabled(ep) && Is_udd_in_send(ep)) {
udd_disable_in_send_interrupt(ep);
// One bank is free then send a ZLP
udd_ack_in_send(ep);
udd_ack_fifocon(ep);
udd_ep_finish_job(ptr_job, false, ep);
return true;
}
if (Is_udd_bank_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);
Assert(ptr_job->stall_requested);
// A stall has been requested during background transfer
ptr_job->stall_requested = false;
udd_disable_endpoint_bank_autoswitch(ep);
udd_enable_stall_handshake(ep);
udd_reset_data_toggle(ep);
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;
}
}
void udd_ep_abort(udd_ep_id_t ep)
{
uint8_t index = ep & USB_EP_ADDR_MASK;
// Stop DMA transfer
udd_disable_endpoint_dma_interrupt(index);
udd_endpoint_dma_set_control(index, 0);
// Kill banks
udd_disable_endpoint_interrupt(index);
while (udd_nb_busy_bank(index)) {
udd_kill_last_in_bank(index);
while(Is_udd_killing_last_in_bank(index));
}
udd_ep_abort_job(ep);
}
static void udd_ep_trans_done(udd_ep_id_t ep)
{
udd_ep_job_t *ptr_job;
uint16_t ep_size, nb_trans;
uint16_t next_trans;
udd_ep_id_t ep_num;
irqflags_t flags;
ep_num = ep & USB_EP_ADDR_MASK;
ep_size = udd_get_endpoint_size(ep_num);
// Get job corresponding at endpoint
ptr_job = &udd_ep_job[ep_num - 1];
// Disable interrupt of endpoint
flags = cpu_irq_save();
udd_disable_endpoint_interrupt(ep_num);
cpu_irq_restore(flags);
if (!ptr_job->busy) {
return; // No job is running, then ignore it (system error)
}
if (USB_EP_DIR_IN == (ep & USB_EP_DIR_IN)) {
// Transfer complete on IN
nb_trans = udd_udesc_get_buf0_size(ep_num);
// Lock emission of new IN packet
udd_enable_busy_bank0(ep_num);
// Ack interrupt
udd_ack_in_send(ep_num);
if (0 == nb_trans) {
if (0 == udd_nb_busy_bank(ep_num)) {
// All byte are transfered than take nb byte requested
nb_trans = udd_udesc_get_buf0_ctn(ep_num);
}
}
// Update number of data transfered
ptr_job->nb_trans += nb_trans;
// Need to send other data
if ((ptr_job->nb_trans != ptr_job->buf_size)
|| ptr_job->b_shortpacket) {
next_trans = ptr_job->buf_size - ptr_job->nb_trans;
if (UDD_ENDPOINT_MAX_TRANS < next_trans) {
// The USB hardware support a maximum
// transfer size of UDD_ENDPOINT_MAX_TRANS Bytes
next_trans = UDD_ENDPOINT_MAX_TRANS -
(UDD_ENDPOINT_MAX_TRANS % ep_size);
udd_udesc_set_buf0_autozlp(ep_num, false);
} else {
// Need ZLP, if requested and last packet is not a short packet
udd_udesc_set_buf0_autozlp(ep_num, ptr_job->b_shortpacket);
ptr_job->b_shortpacket = false; // No need to request another ZLP
}
udd_udesc_set_buf0_ctn(ep_num, next_trans);
udd_udesc_rst_buf0_size(ep_num);
// Link the user buffer directly on USB hardware DMA
udd_udesc_set_buf0_addr(ep_num,
&ptr_job->buf[ptr_job->nb_trans]);
// Start transfer
udd_ack_fifocon(ep_num);
udd_disable_busy_bank0(ep_num);
// Enable interrupt
flags = cpu_irq_save();
udd_enable_in_send_interrupt(ep_num);
udd_enable_endpoint_interrupt(ep_num);
cpu_irq_restore(flags);
return;
}
} else {
// Transfer complete on OUT
nb_trans = udd_udesc_get_buf0_ctn(ep_num);
// Lock reception of new OUT packet
udd_enable_busy_bank0(ep_num);
// Ack interrupt
udd_ack_out_received(ep_num);
udd_ack_fifocon(ep_num);
// Can be necessary to copy data receive from cache buffer to user buffer
if (ptr_job->b_use_out_cache_buffer) {
memcpy(&ptr_job->buf[ptr_job->nb_trans],
udd_ep_out_cache_buffer[ep_num - 1],
ptr_job->buf_size % ep_size);
}
// Update number of data transfered
ptr_job->nb_trans += nb_trans;
if (ptr_job->nb_trans > ptr_job->buf_size) {
ptr_job->nb_trans = ptr_job->buf_size;
}
// If all previous data requested are received and user buffer not full
// then need to receive other data
if ((nb_trans == udd_udesc_get_buf0_size(ep_num))
&& (ptr_job->nb_trans != ptr_job->buf_size)) {
next_trans = ptr_job->buf_size - ptr_job->nb_trans;
if (UDD_ENDPOINT_MAX_TRANS < next_trans) {
// The USB hardware support a maximum transfer size
// of UDD_ENDPOINT_MAX_TRANS Bytes
next_trans = UDD_ENDPOINT_MAX_TRANS
- (UDD_ENDPOINT_MAX_TRANS % ep_size);
} else {
next_trans -= next_trans % ep_size;
}
udd_udesc_rst_buf0_ctn(ep_num);
if (next_trans < ep_size) {
// Use the cache buffer for Bulk or Interrupt size endpoint
ptr_job->b_use_out_cache_buffer = true;
udd_udesc_set_buf0_addr(ep_num,
udd_ep_out_cache_buffer[ep_num-1]);
udd_udesc_set_buf0_size(ep_num, ep_size);
} else {
// Link the user buffer directly on USB hardware DMA
udd_udesc_set_buf0_addr(ep_num, &ptr_job->buf[ptr_job->nb_trans]);
udd_udesc_set_buf0_size(ep_num, next_trans);
}
// Start transfer
udd_disable_busy_bank0(ep_num);
// Enable interrupt
flags = cpu_irq_save();
udd_enable_out_received_interrupt(ep_num);
udd_enable_endpoint_interrupt(ep_num);
cpu_irq_restore(flags);
return;
}
}
// Job complete then call callback
ptr_job->busy = false;
if (NULL != ptr_job->call_trans) {
ptr_job->call_trans(UDD_EP_TRANSFER_OK, ptr_job->nb_trans, ep);
}
return;
}
static void udd_ep_finish_job(udd_ep_id_t ep, bool b_abort)
{
udd_ep_job_t *ptr_job;
uint16_t ep_size;
irqflags_t flags;
// Get job corresponding at endpoint
ptr_job = &udd_ep_job[ep - 1];
// Test if a pending transfer is running. If not, disabled interrupt.
if (!ptr_job->busy) {
flags = cpu_irq_save();
udd_disable_endpoint_interrupt(ep);
cpu_irq_restore(flags);
return;
}
if (Is_udd_endpoint_in(ep)) {
// Update number of data transfered
ptr_job->nb_trans = udd_udesc_get_buf0_size(ep);
if (0 == ptr_job->nb_trans) {
if (0 == udd_nb_busy_bank(ep)) {
// All byte are transfered than take nb byte requested
ptr_job->nb_trans = udd_udesc_get_buf0_ctn(ep);
}
}
} else {
// Transfer complete on OUT
ep_size = udd_format_endpoint_size(ep);
if (ptr_job->b_use_out_cache_buffer) {
// Copy data receiv from cache buffer to user buffer
memcpy(&ptr_job->buf[ptr_job->nb_trans],
udd_ep_out_cache_buffer[ep - 1],
ptr_job->buf_size % ep_size);
ptr_job->nb_trans += udd_udesc_get_buf0_ctn(ep);
} else {
ptr_job->nb_trans = udd_udesc_get_buf0_ctn(ep);
// If all previous data requested are received
// and user buffer not full
if ((ptr_job->nb_trans == udd_udesc_get_buf0_size(ep))
&& (ptr_job->nb_trans !=
ptr_job->buf_size)) {
// Use the cache buffer to receiv last data
// which can be more larger than user buffer remaining
ptr_job->b_use_out_cache_buffer = true;
udd_udesc_rst_buf0_ctn(ep);
udd_udesc_set_buf0_addr(ep,
udd_ep_out_cache_buffer[ep -
1]);
udd_udesc_set_buf0_size(ep, ep_size);
// Free buffer to accept another data to reception
udd_ack_out_received(ep);
udd_ack_fifocon(ep);
return;
}
}
// Free buffer but not accept another data to reception
udd_ack_out_received(ep);
udd_enable_busy_bank0(ep);
udd_ack_fifocon(ep);
}
// Call callback to signal end of transfer
flags = cpu_irq_save();
udd_disable_endpoint_interrupt(ep);
cpu_irq_restore(flags);
ptr_job->busy = false;
if (NULL == ptr_job->call_trans)
return; // No callback linked to job
ptr_job->call_trans((b_abort) ? UDD_EP_TRANSFER_ABORT :
UDD_EP_TRANSFER_OK, ptr_job->nb_trans);
}