/******************************************************************************
* @brief Main function
*
*****************************************************************************/
int main(void)
{
/* Initialize chip - handle erratas */
CHIP_Init( );
/* Initialize clocks and oscillators */
cmuSetup( );
/* Initialize UART peripheral */
uartSetup( );
/* Initialize Development Kit in EBI mode */
BSP_Init(BSP_INIT_DEFAULT);
/* Enable RS-232 transceiver on Development Kit */
BSP_PeripheralAccess(BSP_RS232_UART, true);
/* When DVK is configured, and no more DVK access is needed, the interface can safely be disabled to save current */
BSP_Disable();
/* Write welcome message to UART */
uartPutData((uint8_t*) welcomeString, welLen);
/* Eternal while loop
* CPU will sleep during Rx and Tx. When a byte is transmitted, an interrupt
* wakes the CPU which copies the next byte in the txBuf queue to the
* UART TXDATA register.
*
* When the predefined termiation character is received, the all pending
* data in rxBuf is copied to txBuf and echoed back on the UART */
while (1)
{
/* Wait in EM1 while UART transmits */
EMU_EnterEM1();
/* Check if RX buffer has overflowed */
if (rxBuf.overflow)
{
rxBuf.overflow = false;
uartPutData((uint8_t*) overflowString, ofsLen);
}
/* Check if termination character is received */
if (rxBuf.data[(rxBuf.wrI - 1) % BUFFERSIZE] == TERMINATION_CHAR)
{
/* Copy received data to UART transmit queue */
uint8_t tmpBuf[BUFFERSIZE];
int len = uartGetData(tmpBuf, 0);
uartPutData(tmpBuf, len);
}
}
}
/******************************************************************************
* @brief usartSetup function
*
******************************************************************************/
void usartSetup(void)
{
cmuSetup();
/* Configure GPIO pin as open drain */
GPIO_PinModeSet(SC_GPIO_DATA_PORT, SC_GPIO_DATA_PIN, gpioModeWiredAndPullUp, 1);
/* Prepare struct for initializing USART in asynchronous mode*/
usartInit.enable = usartDisable; /* Don't enable USART upon intialization */
usartInit.refFreq = 0; /* Provide information on reference frequency. When set to 0, the reference frequency is */
usartInit.baudrate = SC_BAUD_RATE; /* Baud rate */
usartInit.oversampling = usartOVS16; /* Oversampling. Range is 4x, 6x, 8x or 16x */
usartInit.databits = usartDatabits8; /* Number of data bits. Range is 4 to 10 */
usartInit.parity = usartEvenParity; /* Parity mode */
usartInit.stopbits = usartStopbits1p5; /* Number of stop bits. Range is 0 to 2, 1.5 for smartcard. */
usartInit.mvdis = false; /* Disable majority voting */
usartInit.prsRxEnable = false; /* Enable USART Rx via Peripheral Reflex System */
usartInit.prsRxCh = usartPrsRxCh0; /* Select PRS channel if enabled */
/* Initialize USART with usartInit struct */
USART_InitAsync(usart, &usartInit);
/* Smart card specific settings for T0 mode. */
usart->CTRL |= USART_CTRL_SCMODE | USART_CTRL_AUTOTRI | USART_CTRL_LOOPBK;
/* Prepare USART Rx interrupt */
USART_IntClear(usart, _USART_IF_MASK);
USART_IntEnable(usart, USART_IF_RXDATAV);
NVIC_ClearPendingIRQ(USART1_RX_IRQn);
NVIC_EnableIRQ(USART1_RX_IRQn);
/* Enable I/O pins at USART1 location #2 */
usart->ROUTE = USART_ROUTE_TXPEN | SC_USART_LOCATION;
/* Disable reception before enabling uart to discard erroneus stuff while card is unpowered. */
usartFlushBuffer();
usartAcceptRX(false);
/* Enable USART */
USART_Enable(usart, usartEnable);
}