/**
* @brief usbd_audio_DataIn
* Data sent on non-control IN endpoint
* @param pdev: device instance
* @param epnum: endpoint number
* @retval status
*/
static uint8_t usbd_cdc_DataIn (void *pdev, uint8_t epnum)
{
uint32_t USB_Tx_length;
usbd_cdc_Change_Open_State(1);
if (!USB_Tx_State)
return USBD_OK;
USB_Tx_length = ring_data_contig(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_head, USB_Tx_Buffer_tail);
if (USB_Tx_length) {
USB_Tx_length = MIN(USB_Tx_length, CDC_DATA_IN_PACKET_SIZE);
} else if (usbd_Last_Tx_Packet_size(pdev, epnum) != CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_State = 0;
return USBD_OK;
}
/* Prepare the available data buffer to be sent on IN endpoint */
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&USB_Tx_Buffer[USB_Tx_Buffer_tail],
USB_Tx_length);
USB_Tx_Buffer_tail = ring_wrap(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_tail + USB_Tx_length);
return USBD_OK;
}
static inline void usbd_cdc_Change_Open_State(uint8_t state) {
if (state != USB_Serial_Open) {
DEBUG("USB Serial state: %d", state);
if (state) {
USB_Tx_failed_counter = 0;
// Also flush everything in TX buffer
uint32_t USB_Tx_length;
USB_Tx_length = ring_data_contig(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_head, USB_Tx_Buffer_tail);
if (USB_Tx_length)
USB_Tx_Buffer_tail = ring_wrap(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_tail + USB_Tx_length);
USB_Tx_State = 0;
USB_Rx_State = 1;
}
USB_Serial_Open = state;
}
}
static void usbd_cdc_Schedule_In(void *pdev)
{
uint32_t USB_Tx_length;
USB_Tx_length = ring_data_contig(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_head, USB_Tx_Buffer_tail);
if (USB_Tx_State) {
if (USB_Serial_Open) {
USB_Tx_failed_counter++;
if (USB_Tx_failed_counter >= 500) {
usbd_cdc_Change_Open_State(0);
// Completely flush TX buffer
DCD_EP_Flush(pdev, CDC_IN_EP);
// Send ZLP
DCD_EP_Tx(pdev, CDC_IN_EP, NULL, 0);
if (USB_Tx_length)
USB_Tx_Buffer_tail = ring_wrap(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_tail + USB_Tx_length);
USB_Tx_State = 0;
}
}
return;
}
if (!USB_Tx_length)
return;
USB_Tx_State = 1;
USB_Tx_failed_counter = 0;
USB_Tx_length = MIN(USB_Tx_length, CDC_DATA_IN_PACKET_SIZE);
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&USB_Tx_Buffer[USB_Tx_Buffer_tail],
USB_Tx_length);
USB_Tx_Buffer_tail = ring_wrap(USB_TX_BUFFER_SIZE, USB_Tx_Buffer_tail + USB_Tx_length);
}
{
while (serial.available() > 0) {
(void)serial.read();
}
}
test(0_USBSERIAL_RingBufferHelperIsSane) {
uint32_t size = 129;
uint32_t head = 0;
uint32_t tail = 0;
head = 0;
tail = 0;
assertEqual(0, ring_data_avail(size, head, tail));
assertEqual(128, ring_space_avail(size, head, tail));
assertEqual(0, ring_data_contig(size, head, tail));
assertEqual(128, ring_space_contig(size, head, tail));
assertEqual(0, ring_space_wrapped(size, head, tail));
head = 63;
tail = 0;
assertEqual(63, ring_data_avail(size, head, tail));
assertEqual(65, ring_space_avail(size, head, tail));
assertEqual(63, ring_data_contig(size, head, tail));
assertEqual(65, ring_space_contig(size, head, tail));
assertEqual(0, ring_space_wrapped(size, head, tail));
head = 63;
tail = 32;
assertEqual(31, ring_data_avail(size, head, tail));
assertEqual(97, ring_space_avail(size, head, tail));
