need some help~~ sending complex I2C data

Zhiliang.Chen

hi all~

chip: 3530

os:wince6.0

we have to have to send I2C data like this

		R/W						R/W
S	ADDR_1	0	0x00	0xFF	0xFF	Sr	ADDR_2	0/1	DATA1...DATAn	P

(S: start, Sr: restart, P: stop )

and the ADDR_1 is not the same as ADDR_2 ,the problem is that OALI2CWrite and OALI2CTransaction can't do this job because:

1) we will never generate "restart" with OALI2CWrite,

2)OALI2CTransaction use the same slave I2C address in the overall communication.

and will 3530 send the slave address right behind it generates a start condition?

thanks in advance!

over 14 years ago

0 Heinrich Ziegenhagel over 14 years ago

Prodigy 10 points

Hi,

I have very similar problems, did you get it to work?

thanks in advance!

0 Zhiliang.Chen over 14 years ago in reply to Heinrich Ziegenhagel

Intellectual 470 points

whether this feature is supported by the haradware is not confirmed officially. but I do get it work by modifying the driver. the most important part is the OALI2CTransaction function.

The I2C function in the BSP is designed to send data in packets, so you can define the device address in each pack, for example:

typedef struct __I2C_PACKET_INFO_Ex_t
{
    BYTE                    slaveAddress;
    UINT                    count;          // number of elements in array
    I2C_OPERATION_TYPE_e    opType;         // operation type (read/write)
    UINT                    result;         // number of bytes written/recieved
    I2C_BUFFER_INFO_t      *rgBuffers;      // reference to buffers
}
I2C_PACKET_INFO_Ex_t;

and in the OALI2CTransaction :

        // packet complete
        if (stat & I2C_STAT_ARDY)
            {
            // this notificaiton is needed to progress to next packet
            OUTREG16(&pI2CRegs->STAT, I2C_STAT_ARDY);

            // move to next transaction
            if (idxPacket < pInfo->count)
                {
                // get next packet
                //
                pPacket = &pInfo->rgPackets[idxPacket];
                ++idxPacket;

                // initialize packet info
                idxBuffer = 0;
                pData = pPacket->rgBuffers[idxBuffer].pBuffer;
                remainingInBuffer = OALI2CGetBufferSizeEx(pPacket, idxBuffer);
                remainingInPacket = OALI2CGetPacketSizeEx(pPacket);

// Set slave address
OUTREG16(&pI2CRegs->SA, pPacket->slaveAddress );

you have to change some other functions for these modifications. Good luck!

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need some help~~ sending complex I2C data