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/projects/cubeos/src_current/drivers/i2c/digital.c

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/*  src_experimental/drivers/i2c/digital.c
   CubeOS Version 0.4.90 experimental
   Copyright (C) 1999,2000 Holger Kenn

   CubeOS is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or any later version.

   CubeOS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

 */
#include <stdlib.h>
#include <stdio.h>
#include <digital.h>
#include <i2cd.h>

struct _I2C_bin_datas _I2C_bin_data[32];
int _I2C_binnum;


unsigned char _I2C_digital_mbuf[MAXI2CMESSLENGTH];
struct i2cmess _I2C_digital_m;

unsigned char I2C_ReadBinIn (int chip)
{

        if (_I2C_bin_data[chip].active == 0)
                return (0);

/* read value */
        _I2C_digital_m.address = _I2C_bin_data[chip].address | 0x1;     /* Read adress */
        _I2C_digital_m.nrBytes = 1;     /* Read one byte */
        _I2C_digital_mbuf[0] = 0;       /* clear buffer */
        _I2C_digital_m.buf = _I2C_digital_mbuf;


        I2C_process (_I2C_bin_data[chip].bus, I2C_MASTER, &_I2C_digital_m);

        return _I2C_digital_mbuf[0];

}

int I2C_WriteBinOut (int chip, unsigned char value)
{

        if (_I2C_bin_data[chip].active == 0)
                return (-1);

/* read value */
        _I2C_digital_m.address = _I2C_bin_data[chip].address;   /* Write adress */
        _I2C_digital_m.nrBytes = 1;     /* Write one byte */
        _I2C_digital_mbuf[0] = value;
        _I2C_digital_m.buf = _I2C_digital_mbuf;

        I2C_process (_I2C_bin_data[chip].bus, I2C_MASTER, &_I2C_digital_m);

        return (_I2C_digital_m.status == I2C_OK);

}

int I2C_init_digital ()
{
        int i;

        _I2C_binnum = 0;
        for (i = 0; i < 31; i++)
                _I2C_bin_data[i].active = 0;

// later this should come from the HWinfo struct 
        for (i = 0; i < 31; i++) {

                if (i < 16) {
                        _I2C_bin_data[_I2C_binnum].bus = I2CA;
                } else {
                        _I2C_bin_data[_I2C_binnum].bus = I2CB;
                }

                if ((i & 0xf) < 8) {
                        _I2C_bin_data[_I2C_binnum].address = ((i & 0x07) << 1) | 0x40;  // PCF8574

                } else {
                        _I2C_bin_data[_I2C_binnum].address = ((i & 0x07) << 1) | 0x70;  // PCF8574A

                }
                _I2C_bin_data[_I2C_binnum].status = 0x00;       // maybe later...



                _I2C_digital_m.address = _I2C_bin_data[_I2C_binnum].address | 0x1;      /* Read adress */
                _I2C_digital_m.nrBytes = 1;     /* Read one false byte, then read value */
                _I2C_digital_mbuf[0] = 0;       /* clear buffer */
                _I2C_digital_m.buf = _I2C_digital_mbuf;
                I2C_process (_I2C_bin_data[_I2C_binnum].bus, I2C_MASTER, &_I2C_digital_m);


                switch (_I2C_digital_m.status) {
                case I2C_OK:
                        printf ("digital device %d at adress 0x%x \n", _I2C_binnum, _I2C_bin_data[_I2C_binnum].address);
                        _I2C_bin_data[_I2C_binnum].active = 1;
                        _I2C_binnum++;
                        break;
                case I2C_TIME_OUT:
                case I2C_NO_BUS:
                case I2C_NACK_ON_ADDRESS:
                        break;

                default:
                        I2C_messagestatus (&_I2C_digital_m);
                }


        }

        return (_I2C_binnum > 0 ? 0 : 1);


}

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