Kontron pITX-SP - Manual (Page 28)

KTD-S0003-C Page 24 CPLD Interface
p ITX-SP Software Guide
//*********************************************************
//* Clock out one bit
//*********************************************************
void I2C_Bit_Out (int bit_out)
{
if
(bit_out)
SDA_High ();
else
SDA_Low ();
I2C_Delay ();
SCL_High ();
I2C_Delay ();
SCL_Low ();
I2C_Delay ();
}
//*********************************************************
//* Clock in one bit
//*********************************************************
int I2C_Bit_In (void)
{
int
bit_in;
SDA_High ();
SCL_High ();
I2C_Delay ();
bit_in = SDA_Read ();
I2C_Delay ();
SCL_Low ();
I2C_Delay ();
return bit_in;
}
//*********************************************************
//* Send one byte on the bus. No start or stop conditions
//* are generated here but i2c_error will be set according
//* to the result. Returns 1 on success, 0 if we lose the
//* arbitration or if the slave doesn't acknowledge the
//* byte. Check i2c_error for the actual result on error
//*********************************************************
int I2C_Byte_Out (int byte_out)
{
int bit_count = 8, bit_in;
while (bit_count)
{
if (byte_out & 0x80)
I2C_Bit_Out (TRUE);
else
I2C_Bit_Out (FALSE);
byte_out <<= 1;
bit_count--;
}