Example code for EEPROM - F28M35x Evaluation board

Anoja,

This example is not available for this device family and we don't have any plans to update it.

But, you should be able to easily take i2c_eeprom example from other devices say F2806x / F2803x and adapt it to F28M35x device.

Regards,
Manoj

Thank you for the reply. From the datasheet of CAT24C256 EEPROM, I could figure out the sequence of how to read and write to it. The current issue is that I am reading 0xFF everytime I read the location I wrote into. Can you suggest any modification or let me know if my code is wrong.

// Sending a EEPROM write byte packet

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_WRITE);
ulDataTx[0] = 0x00;
ulDataTx[1] = 0x00;
ulDataTx[2] = 0x12;
ulDataTx[3] = 0x35;
ulDataTx[4] = 0xA1;
ulDataTx[5] = 0x11;
ulDataTx[6] = 0xF0;
ulDataTx[7] = 0x01;

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[0]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[1]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[2]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[3]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[4]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[5]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[6]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[7]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

//Read 3 bytes

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_WRITE);

// Dummy Write to set the future read address
I2CMasterDataPut(I2C0_MASTER_BASE, 0); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, 0); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

// Start reading the address 0x00
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_READ);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}
ulDataRx[0] = I2CMasterDataGet(I2C0_MASTER_BASE);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
I2CWhileMasterBusy
ulDataRx[1] = I2CMasterDataGet(I2C0_MASTER_BASE);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
I2CWhileMasterBusy
ulDataRx[2] = I2CMasterDataGet(I2C0_MASTER_BASE);

 

Thanks

Anoja

Anoja,

Are you waiting long enough have EEPROM write command is issued? Do you see I2C talking to EEPROM? Is the EEPROM acknowledging the data / command received?

Regards,
Manoj

Hello,

I have just above 5ms time wait after the STOP bit in the write sequence.

I can see I2C talking to EEPROM at random times: I wrote 1,2,3,4 at starting address and was able to read it in debugging mode. Not sure at what condition it read it.

EEPROM is acknowledging the data/command received.

Can you explain where all I need to wait? 

// Initialize the receive buffer.
for(ulindex = 0; ulindex < NUM_I2C_DATA; ulindex++)
{
ulDataRx[ulindex] = 0;
}

// Sending a EEPROM write byte packet
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, false);
ulDataTx[0] = 0x00;
ulDataTx[1] = 0x00;
ulDataTx[2] = 0x01;
ulDataTx[3] = 0x02;
ulDataTx[4] = 0x03;
ulDataTx[5] = 0x04;

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[0]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

int i;
for(i=1;i<=4;i++){
I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[i]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}
}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[5]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

unsigned long wait =0;
for(wait =0; wait <= 50000; wait++);

//Read byte

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_WRITE);

// Dummy Write to set the future read address
I2CMasterDataPut(I2C0_MASTER_BASE, 0); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
I2CWhileMasterBusy

I2CMasterDataPut(I2C0_MASTER_BASE, 0); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
I2CWhileMasterBusy

// Start reading the address 0x00
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_READ);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
I2CWhileMasterBusy
ulDataRx[0] = I2CMasterDataGet(I2C0_MASTER_BASE);

for(i=1;i<=2;i++){
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
I2CWhileMasterBusy
ulDataRx[i] = I2CMasterDataGet(I2C0_MASTER_BASE);
}

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
I2CWhileMasterBusy
ulDataRx[3] = I2CMasterDataGet(I2C0_MASTER_BASE);

Anoja

Anoja,

Wait time depends upon EEPROM specs and not on I2C. You may have to check EEPROM datasheet.

Regards,
Manoj

Hi,

   I  have reduced my code to do a single byte read and write.

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, false);
ulDataTx[0] = 0x00;
ulDataTx[1] = 0xff;
ulDataTx[2] = 0x03;

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[0]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[1]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

I2CMasterDataPut(I2C0_MASTER_BASE, ulDataTx[2]);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
while(I2CMasterBusy(I2C0_MASTER_BASE)){}

unsigned long wait =0;
for(wait =0; wait <= 50000; wait++);

//Read byte

// Initialize the receive buffer.
for(ulindex = 0; ulindex < NUM_I2C_DATA; ulindex++)
{
ulDataRx[ulindex] = 0;
}
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_WRITE);

// Dummy Write to set the future read address
I2CMasterDataPut(I2C0_MASTER_BASE, 0); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
I2CWhileMasterBusy

I2CMasterDataPut(I2C0_MASTER_BASE, 0XFF); // address zero in the EEPROM memory
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
I2CWhileMasterBusy

// Start reading the address 0x00
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, I2C_READ);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
I2CWhileMasterBusy
ulDataRx[0] = I2CMasterDataGet(I2C0_MASTER_BASE);

 

From the datasheet of EEPROM, the write cycle time is found to be 5ms. Please find the attachment. I am reading 0xff in any case.

Anoja,

If you are trying to write 0x3 to EEPROM address 0x0. Then you need to follow these steps:-

I2CWrite
1) Configure I2C slave address of EEPROM into I2CSAR register
2) Configure I2C and I2CFIFO to enable TX FIFO.
3) Set I2CCNT = 3
4) Write I2CDXR = 0 (A15-A8)
5) Write I2CDXR = 0 (A7-A0) <-- Writing EEPROM address 0
6) Write I2CDXR = 3 <-- Writing to data 3 to EEPROM (This will fill the TXFIFO)
7) Send start bit, transmit and master mode. (I2caRegs.I2CMDR.all = 0x6E20)
8) Wait for 5ms

I2CRead
1) Configure I2C slave address of EEPROM into I2CSAR register
2) Configure I2C and I2CFIFO to enable TX FIFO.
3) Set I2CCNT = 2
4) Write I2CDXR = 0 (A15-A8)
5) Write I2CDXR = 0 (A7-A0) <-- Writing EEPROM address 0
6) Send start bit, transmit and master mode (I2caRegs.I2CMDR.all = 0x2620)
7) Set I2CCNT = 1
8) Send start bit, receive and master mode (I2caRegs.I2CMDR.all = 0x2C20)

Regards,
Manoj

Hi Manoj,

   I guess the steps you mentioned above is for C28 core and not for M3. I am trying to read EEPROM using M3.

Anoja

Sure, Thank you