sio.c File Reference

#include <psx.h>
#include <psxsio.h>
#include <stdio.h>

Functions
void	SIOStart (int bitrate)
	Initialize SIO communication at the specified bitrate (baud rate).
void	SIOStartEx (int bitrate, int datalength, int parity, int stopbit)
	Same as SIOStart() but with more control.
void	SIOStop ()
	Shuts down SIO communication.
unsigned char	SIOReadByte ()
	Read a single byte from the input buffer.
void	SIOSendByte (unsigned char data)
	Send a single byte to the output buffer.
int	SIOCheckInBuffer ()
	Check if any data is waiting in the input buffer.
int	SIOCheckOutBuffer ()
	Check if port is ready to send data (previous operation finished).

Function Documentation

int SIOCheckInBuffer

(

void

)

Check if any data is waiting in the input buffer.

Must be used when fetching data otherwise incorrect data could be read (usually 0x00).

Returns

Non-zero if there is data waiting in the input buffer, zero otherwise.

int SIOCheckOutBuffer

(

void

)

Check if port is ready to send data (previous operation finished).

Must be used when sending data as the output buffer is only 2 bytes long.

Returns

Non-zero if port is ready to send data, zero otherwise.

unsigned char SIOReadByte

(

void

)

Read a single byte from the input buffer.

Returns

Data byte from input buffer

void SIOSendByte

(

unsigned char

data

)

Send a single byte to the output buffer.

Parameters

data	Byte to send

void SIOStart

(

int

bitrate

)

Initialize SIO communication at the specified bitrate (baud rate).

Mode is 8N1. (Data Length = 8 bit, No parity, Stop bit Length = 1 bit)

Parameters

bitrate

Bitrate (baud rate)

void SIOStartEx	(	int	bitrate,
		int	datalength,
		int	parity,
		int	stopbit
	)

Same as SIOStart() but with more control.

IMPORTANT: Must use defined macros. For example setting datalength to 5 should be done with "SIO_DATA_LEN_5" and not by simply passing 5 as an argument.

Parameters

bitrate	Bit rate (baud rate)
datalength	Character (data) length
parity	Parity
stopbit	Stop bit length

void SIOStop

(

void

)

Shuts down SIO communication.