static void udd_ctrl_in_sent(void)
{
static bool b_shortpacket = false;
uint16_t nb_remain;
irqflags_t flags;
flags = cpu_irq_save();
udd_disable_in_send_interrupt(0);
cpu_irq_restore(flags);
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// 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();
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, this 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;
}
//** 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_out_received(0)) {
// IN DATA phase aborted by OUT ZLP
cpu_irq_restore(flags);
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP;
return; // Exit of IN DATA phase
}
// Write quickly the IN data
memcpy(udd_ctrl_buffer,
udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans,
nb_remain);
udd_ctrl_payload_nb_trans += nb_remain;
udd_udesc_set_buf0_ctn(0, nb_remain);
// Validate and send the data available in the control endpoint buffer
udd_ack_in_send(0);
udd_enable_in_send_interrupt(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);
}
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;
}
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)
{
uint16_t ep_size, trans_size, short_packet;
bool b_dir_in;
udd_ep_job_t *ptr_job;
irqflags_t flags;
b_dir_in = (USB_EP_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))
|| 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.
//
// The USB hardware support a maximum transfer size of 0x7FFF Bytes
ep_size = udd_get_endpoint_size(ep);
if (0x7FFF < buf_size) {
trans_size = 0x7FFF - (0x7FFF % ep_size);
short_packet = 0;
} else {
trans_size = buf_size;
short_packet = trans_size % ep_size;
}
if (b_dir_in) {
// Need ZLP, if requested and last packet is not a short packet
udd_udesc_set_buf0_autozlp(ep, b_shortpacket);
udd_udesc_set_buf0_ctn(ep, trans_size);
udd_udesc_rst_buf0_size(ep);
// Link the user buffer directly on USB hardware DMA
udd_udesc_set_buf0_addr(ep, buf);
} else {
udd_udesc_rst_buf0_ctn(ep);
ptr_job->nb_trans = 0;
if (trans_size < ep_size) {
// The user buffer is smaller than endpoint size
if (AVR32_USBC_PTYPE_ISOCHRONOUS ==
udd_get_endpoint_type(ep)) {
ptr_job->busy = false;
return false; // The user must use a buffer corresponding at isochrnous endpoint 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,
udd_ep_out_cache_buffer[ep - 1]);
udd_udesc_set_buf0_size(ep, ep_size);
} else {
// Link the user buffer directly on USB hardware DMA
ptr_job->b_use_out_cache_buffer = false;
udd_udesc_set_buf0_addr(ep, buf);
udd_udesc_set_buf0_size(ep, trans_size - short_packet);
}
}
// Update Job information
ptr_job->buf = buf;
ptr_job->buf_size = trans_size;
ptr_job->call_trans = callback;
ptr_job->busy = true;
// Start transfer
udd_disable_busy_bank0(ep);
// Enable interrupt
flags = cpu_irq_save();
if (b_dir_in) {
udd_ack_fifocon(ep);
udd_ack_in_send(ep);
udd_enable_in_send_interrupt(ep);
} else {
udd_enable_out_received_interrupt(ep);
}
udd_enable_endpoint_interrupt(ep);
cpu_irq_restore(flags);
return true;
}
