I2C master write buffer function has a problem

T_Mura · ‎Sep 22, 2020

I have executed the following function to initialize the I2C slave device, but it seems that communication is not working properly.

I2CMAST_MasterClearStatus();

Stat = I2CMAST_MasterWriteBuf(AQM0802_ADW, &TestData, 2, I2CMAST_MODE_COMPLETE_XFER);

for(;;) {

if(0u != (I2CMAST_MasterStatus() & I2CMAST_MSTAT_WR_CMPLT))

break;

}

※Note　Slave Address:0x7c、The contents of TestData are 0x80,0x34

Additional information：Implementation is a fixed function

The actual waveform as a result of executing the WriteBuf function is　（See attached document)

It seems that only the first slave address is transferred from the actual waveform

There seems to be no problem with the transfer timing of the slave address．

I would appreciate any good advice on this phenomenon.

Thank you

VenkataD_41 · ‎Sep 22, 2020

Hi,

Can you please follow the following firmware flow and try once?

(void) I2CM_I2CMasterClearStatus();

/* Start I2C write and check status*/

if(I2CM_I2C_MSTR_NO_ERROR == I2CM_I2CMasterWriteBuf(I2C_SLAVE_ADDR,

buffer, PACKET_SIZE,

I2CM_I2C_MODE_COMPLETE_XFER))

{

/*If I2C write started without errors,

/ wait until I2C Master completes write transfer

*/

while (0u == (I2CM_I2CMasterStatus() & I2CM_I2C_MSTAT_WR_CMPLT))

{

/* Wait */

}

/* Display transfer status */

if (0u == (I2CM_I2CMasterStatus() & I2CM_I2C_MSTAT_ERR_XFER))

{

/* Check if all bytes was written */

if (I2CM_I2CMasterGetWriteBufSize() == BUFFER_SIZE)

{

status = TRANSFER_CMPLT;

}

The above firmware flow is taken from the Cypress code example on SCB based I2C Master. I am attaching the code example for your reference. Please test it at your side and update us.

Thanks

Ganesh

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I2C master write buffer function has a problem

I2C master write buffer function has a problem

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