/**************************************************************************//**
\brief Sets USART module parameters.
\param
usartmode - pointer to HAL_UsartDescriptor_t
\return
none.
******************************************************************************/
void halSetUsartConfig(HAL_UsartDescriptor_t *usartMode)
{
UCSRnB(usartMode->tty) = 0x00; // disable usart
UBRRn(usartMode->tty) = usartMode->baudrate; // usart speed
if (USART_MODE_ASYNC == usartMode->mode)
{
UCSRnA(usartMode->tty) = (uint8_t)USART_DOUBLE_SPEED << U2X0; // Double the USART Transmition Speed
UCSRnC(usartMode->tty) = 0x00;
}
else
{
UCSRnA(usartMode->tty) = 0;
UCSRnC(usartMode->tty) = usartMode->edge; // edge select
}
UCSRnC(usartMode->tty) |= usartMode->mode;
UCSRnC(usartMode->tty) |= usartMode->dataLength; // character size
UCSRnC(usartMode->tty) |= usartMode->parity; // parity mode
UCSRnC(usartMode->tty) |= usartMode->stopbits; // stop bit select
UCSRnA(usartMode->tty) |= (1 << RXC0); // clear receive interrupt
UCSRnB(usartMode->tty) |= (1 << RXEN1) | (1 << TXEN1); // usart enable
UCSRnB(usartMode->tty) |= (1 << RXCIE0) ; // receive interrupt enable
}
bool
UART::begin(uint32_t baudrate, uint8_t format)
{
uint16_t setting = (F_CPU / (baudrate * 8L)) - 1;
// Check if double rate is not possible
if (setting > 4095) {
setting = (F_CPU / (baudrate * 16L)) - 1;
} else {
*UCSRnA() = _BV(U2X0);
}
// Set baudrate and format
*UBRRn() = setting;
*UCSRnC() = format;
// Enable receiver and transmitter interrupt
*UCSRnB() = (_BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0));
return (true);
}
