/*! \brief Send a Reset signal and listen for Presence signal. (Polled
* UART DRIVER)
*
* Generates the waveform for transmission of a Reset pulse on the
* 1-Wire(R) bus and listens for presence signals.
*
* \return A bitmask of the buses where a presence signal was detected.
*/
unsigned char OWI_DetectPresence()
{
// Reset UART receiver to clear RXC register.
OWI_UART_STATCTRL_REG_B &= ~(1 << OWI_RXEN);
OWI_UART_STATCTRL_REG_B |= (1 << OWI_RXEN);
// Set UART Baud Rate to 9600 for Reset/Presence signalling.
OWI_UART_BAUD_RATE_REG_L = OWI_UBRR_9600;
// Return 0 if the value received matches the value sent.
// return 1 else. (Presence detected)
return (OWI_TouchBit(OWI_UART_RESET) != OWI_UART_RESET);
}
/*! \brief Read a bit from the bus(es). (Polled UART DRIVER)
*
* Generates the waveform for reception of a bit on the 1-Wire(R) bus(es).
*
* \return The value read from the bus (0 or 1).
*/
unsigned char OWI_ReadBit()
{
// Return 1 if the value received matches the value sent.
// Return 0 else. (A slave held the bus low).
return (OWI_TouchBit(OWI_UART_READ_BIT) == OWI_UART_READ_BIT);
}
/*! \brief Write a '1' bit to the bus(es). (Polled UART DRIVER)
*
* Generates the waveform for transmission of a '1' bit on the 1-Wire
* bus.
*/
void OWI_WriteBit1()
{
OWI_TouchBit(OWI_UART_WRITE1);
}
/*! \brief Write a '0' to the bus(es). (Polled UART DRIVER)
*
* Generates the waveform for transmission of a '0' bit on the 1-Wire(R)
* bus.
*/
void OWI_WriteBit0()
{
OWI_TouchBit(OWI_UART_WRITE0);
}
/*! \brief Write a '0' to the bus(es). (Polled UART DRIVER)
*
* Generates the waveform for transmission of a '0' bit on the 1-Wire(R)
* bus.
*/
void OWI_WriteBit0(unsigned char pins)
{
OWI_TouchBit(OWI_UART_WRITE0);
}
