/**************************************************************************//**
\brief Receive byte from usb FIFO.
\param[out]
p - pointer to byte memory;
\return
true - there is received byte; \n
false - there is not received byte;
******************************************************************************/
bool getByteUsbFifo(uint8_t *p)
{
if (!GPIO_RXF_read())
{
GPIO_RD_clr();
NOP;
*p = USB_DATA_PIN;
GPIO_RD_set();
return true;
}
return false;
}
/**************************************************************************//**
\brief Puts the byte received to the cyclic buffer.
******************************************************************************/
static void usbfifoRxBufferFiller(void)
{
uint16_t old;
uint16_t poW;
uint16_t poR;
uint8_t *buffer;
HalUsartService_t *control;
if (!usbfifoPointDescrip)
{ // unregistered intrrupt is occurred
HAL_DisableIrq(IRQ_7);
return;
}
control = &usbfifoPointDescrip->service;
poW = control->rxPointOfWrite;
poR = control->rxPointOfRead;
buffer = usbfifoPointDescrip->rxBuffer;
if (!buffer)
{
HAL_DisableIrq(IRQ_7);
return;
}
old = poW;
if (++poW == usbfifoPointDescrip->rxBufferLength)
poW = 0;
if (poW == poR)
{ // Buffer full.
HAL_DisableIrq(IRQ_7);
return;
} // Buffer full.
control->rxPointOfWrite = poW;
GPIO_RD_clr();
NOP;
buffer[old] = USB_DATA_PIN;
GPIO_RD_set();
control->rxBytesInBuffer++;
usbfifoPostTask(USB_FIFO_TASK_RX);
}