Hi
> Has anyone written any general-purpose routines for SDCC to deal
> with the on-chip I2C controller in the 87C751 that they'd be willing
> to share?
Attached are the routines I use for my p89c668 devices. The I2C seems to be
equivalent to the 87C751 one.
Here is an application note from philips with more error detection that I will
switch to myself.
http://www.nxp.com/acrobat_download/applicationnotes/AN10155_1.pdf
Hope it helps
Gudjon
#include "i2clib.h"
void i2c_init(unsigned char addr)
{
S1CON=0xE4;
while(!SI);
S1DAT=addr;
S1CON=0xC4;
while(!SI);
}
void i2c_write_byte(unsigned char out_byte)
{
S1DAT=out_byte;
S1CON=0xC4;
while (!SI);
}
unsigned char i2c_read_ibyte() // Read all but the last byte
{
S1CON=0xC4;
while (!SI);
return S1DAT;
}
unsigned char i2c_read_lbyte() // Read the last byte
{
S1CON=0xC0;
while (!SI);
return S1DAT;
}
void i2c_stop()
{
S1CON=0xD4;
while (!STO);
}
#ifndef __I2CLIB__
#define __I2CLIB__
#include <p89c66x.h>
void i2c_init(unsigned char addr);
void i2c_write_byte(unsigned char out_byte);
unsigned char i2c_read_ibyte(); // Read all but the last byte
unsigned char i2c_read_lbyte(); // Read the last byte
void i2c_stop();
#endif
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