ds1338/ds1338.c

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#include <util/twi.h>

#include "../twi_basics/twi_basics.h"
#include "ds1338.h"

void ds1338_setup()
{
        twi_set_bitrate(TWI_BITRATE);
        twi_init();
}

static ds1338_status ds1338_writePointer(uint8_t location)
{
        if(location<64)
        {
                switch (twi_start()) {
                case TW_START:
                        //this is expected
                        break;
                default:
                        return BUS_ERROR;
                }

                switch (twi_send(DEVICE|WRITE)) {
                case TW_MT_SLA_ACK:
                        //this is expected
                        break;
                case TW_MT_SLA_NACK:
                        return NO_DEVICE;
                default:
                        return BUS_ERROR;
                }

                switch (twi_send(location)) {
                case TW_MT_DATA_ACK:
                        //this is expected
                        break;
                case TW_MT_DATA_NACK:
                        return DEVICE_BUSY;
                default:
                        return BUS_ERROR;
                }
                return NO_ERROR;
        }
        else
                return LOCATION_OUTOFBOUNDS;
}

static ds1338_status ds1338_restartToRead()
{
        switch (twi_start()) {
        case TW_REP_START:
                //this is expected
                break;
        default:
                return BUS_ERROR;
        }
        switch (twi_send(DEVICE|READ)) {
        case TW_MR_SLA_ACK:
                //this is expected
                break;
        case TW_MR_SLA_NACK:
                return NO_DEVICE;
        default:
                return BUS_ERROR;
        }
        return NO_ERROR;
}
ds1338_status ds1338_readTimeDateControl(ds1338TDC * data)
{
        return ds1338_readBufferFromNVRAM(0x00,8,data->rawData);
}

ds1338_status ds1338_writeTimeDateControl(ds1338TDC * data)
{
        return ds1338_writeBufferToNVRAM(0x00,8,data->rawData);
}

ds1338_status ds1338_writeBufferToNVRAM(uint8_t location,uint8_t lenght, uint8_t * data)
{
        ds1338_status status;
        if((status=ds1338_writePointer(location)) != NO_ERROR)
                return status;
        if(location+lenght >64)
                return RANGE_OUTOFBOUNDS;
        int i=0;
        do
        {
                if(twi_send(data[i++])!=TW_MT_DATA_ACK)
                        return DEVICE_BUSY;
        }while(i<lenght);
        twi_stop();
        return NO_ERROR;
}

ds1338_status ds1338_readBufferFromNVRAM(uint8_t location,uint8_t lenght, uint8_t * data)
{
        ds1338_status status;
        if((status=ds1338_writePointer(location)) != NO_ERROR)
                return status;
        if(location+lenght >64)
                return RANGE_OUTOFBOUNDS;
        if((status=ds1338_restartToRead()) != NO_ERROR)
                return status;

        lenght--;
        int i=0;
        do
        {
                twi_receive(&data[i],lenght-i);
                i++;
        }while(i<=lenght);
        twi_stop();
        return NO_ERROR;
}

ds1338_status ds1338_writeByteToNVRAM(uint8_t location, uint8_t data)
{
        ds1338_status status;
        if((status=ds1338_writePointer(location)) != NO_ERROR)
                return status;

        if(twi_send(data)!=TW_MT_DATA_ACK)
                return DEVICE_BUSY;

        twi_stop();
        return NO_ERROR;

}
ds1338_status ds1338_readByteFromNVRAM(uint8_t location, uint8_t * data)
{
        ds1338_status status;
        if((status=ds1338_writePointer(location)) != NO_ERROR)
                return status;
        if((status=ds1338_restartToRead()) != NO_ERROR)
                return status;
        twi_receive(data,0);
        twi_stop();
        return NO_ERROR;
}

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