/**
* USART interrupt handler
*/
void USART2_Handler(void)
{
Usart *pUs = BASE_USART;
uint32_t status;
uint16_t serialState;
uint32_t count;
status = USART_GetStatus(pUs);
status &= USART_GetItMask(pUs);
/* If USB device is not configured, do nothing */
if (!isCdcSerialON) {
USART_DisableIt(pUs, 0xFFFFFFFF);
return;
}
if (status & US_CSR_TIMEOUT) {
/*Clear TIMEOUT Flag and Start Time-out After Next Character Received*/
USART_AcknowledgeRxTimeOut(BASE_USART, 0);
/* Flush the DMA FIFO */
XDMAC_SoftwareFlushReq(dmad.pXdmacs, usartDmaRxChannel);
/* Transfer the last pack through USB */
count = dmad.pXdmacs->XDMAC_CHID[usartDmaRxChannel].XDMAC_CUBC;
SCB_InvalidateDCache_by_Addr((uint32_t *)usartBuffers, DATAPACKETSIZE - count);
while (CDCDSerialDriver_Write(usartBuffers, DATAPACKETSIZE - count, 0, 0)
!= USBD_STATUS_SUCCESS);
/*Reset DMA transfer*/
XDMAD_StopTransfer(&dmad, usartDmaRxChannel);
_UsartDmaRx();
} else {
/* Errors */
serialState = CDCDSerialDriver_GetSerialState();
/* Overrun */
if ((status & US_CSR_OVRE) != 0) {
TRACE_WARNING("USART_IrqHandler: Overrun\n\r");
serialState |= CDCSerialState_OVERRUN;
}
/* Framing error */
if ((status & US_CSR_FRAME) != 0) {
TRACE_WARNING("USART_IrqHandler: Framing error\n\r");
serialState |= CDCSerialState_FRAMING;
}
CDCDSerialDriver_SetSerialState(serialState);
}
}
//------------------------------------------------------------------------------
/// Handles interrupts coming from USART #0.
//------------------------------------------------------------------------------
static void ISR_Usart0()
{
unsigned int status = AT91C_BASE_US0->US_CSR;
unsigned short serialState;
// If USB device is not configured, do nothing
if (USBD_GetState() != USBD_STATE_CONFIGURED) {
AT91C_BASE_US0->US_IDR = 0xFFFFFFFF;
return;
}
// Buffer has been read successfully
if ((status & AT91C_US_ENDRX) != 0) {
// Disable timer
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
// Send buffer through the USB
while (CDCDSerialDriver_Write(usartBuffers[usartCurrentBuffer],
DATABUFFERSIZE, 0, 0) != USBD_STATUS_SUCCESS);
// Restart read on buffer
USART_ReadBuffer(AT91C_BASE_US0,
usartBuffers[usartCurrentBuffer],
DATABUFFERSIZE);
usartCurrentBuffer = 1 - usartCurrentBuffer;
// Restart timer
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
}
// Buffer has been sent
if ((status & AT91C_US_TXBUFE) != 0) {
// Restart USB read
CDCDSerialDriver_Read(usbBuffer,
DATABUFFERSIZE,
(TransferCallback) UsbDataReceived,
0);
AT91C_BASE_US0->US_IDR = AT91C_US_TXBUFE;
}
// Errors
serialState = CDCDSerialDriver_GetSerialState();
// Overrun
if ((status & AT91C_US_OVER) != 0) {
TRACE_WARNING( "ISR_Usart0: Overrun\n\r");
serialState |= CDCDSerialDriver_STATE_OVERRUN;
}
// Framing error
if ((status & AT91C_US_FRAME) != 0) {
TRACE_WARNING( "ISR_Usart0: Framing error\n\r");
serialState |= CDCDSerialDriver_STATE_FRAMING;
}
CDCDSerialDriver_SetSerialState(serialState);
}
