/*! \brief Put data (5-8 bit character).
*
* Stores data byte in TX software buffer and enables DRE interrupt if there
* is free space in the TX software buffer.
*
* \param usart_data The USART_data_t struct instance.
* \param data The data to send.
*/
bool USART_TXBuffer_PutByte(USART_data_t * usart_data, uint8_t data)
{
uint8_t tempCTRLA;
uint8_t tempTX_Head;
bool TXBuffer_FreeSpace;
USART_Buffer_t * TXbufPtr;
TXbufPtr = &usart_data->buffer;
TXBuffer_FreeSpace = USART_TXBuffer_FreeSpace(usart_data);
if(TXBuffer_FreeSpace)
{
tempTX_Head = TXbufPtr->TX_Head;
TXbufPtr->TX[tempTX_Head]= data;
/* Advance buffer head. */
TXbufPtr->TX_Head = (tempTX_Head + 1) & USART_TX_BUFFER_MASK;
/* Enable DRE interrupt. */
tempCTRLA = usart_data->usart->CTRLA;
tempCTRLA = (tempCTRLA & ~USART_DREINTLVL_gm) | usart_data->dreIntLevel;
usart_data->usart->CTRLA = tempCTRLA;
}
return TXBuffer_FreeSpace;
}
int usart_putchar (char c, FILE *stream)
{
if (c == '\n') {
usart_putchar ('\r', stream);
}
while (!USART_TXBuffer_FreeSpace (&usart_stdio_data));
USART_TXBuffer_PutByte (&usart_stdio_data, c);
return 0;
}
/*! \brief Write a byte to the circular transmit buffer
*
* \param uart pointer to UART datastructure with buffers
* \param data byte to be written
*
* \return void
*/
void uart_putc(USART_data_t *uart, uint8_t data)
{
if ( USART_TXBuffer_FreeSpace(uart) ) {
USART_TXBuffer_PutByte(uart, data);
}
}
