F28M35 I2c error

Dan O'Rourke

I am using the concerto experimenter kit writing and reading I2C to the eeprom. When I do a read I am getting a return = 12 on I2CMasterERR . I can do a SysCtlPeripheralReset (i2c) and the read will then work properly but it happens quite frequently and seems like a rather harsh way to clear an error. I get the error after setting up the eeprom address to align it for the read

i2cCurrentAddress = I2C_SLV_ADDR_EEPROM;

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, I2C_SLV_ADDR_EEPROM, I2C_WRITE);

while (I2CMasterBusy(I2C0_MASTER_BASE)) {}

// Dummy Write to set the future read address

I2CMasterDataPut(I2C0_MASTER_BASE, high_addr); // high address

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);

while (I2CMasterBusy(I2C0_MASTER_BASE)) {}

err =I2CMasterErr(I2C0_MASTER_BASE); //ERROR found here =12

My questions is there a better method to clear this data ack, addr ack, error then to reset the i2c periphearal?

I tried sending I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP (0x04) didn't seem to help

When looking at the I2CMCS register in debug is this the read-only register?

Thanks in advance for your advice

over 13 years ago

0 Ben-Zion Elishkov over 13 years ago

Prodigy 10 points

i am experiencing the same problem!

I2C1 is connected to microchip PortExpender MCP23018.

the error occures during register write.

any response will be highly appreciated.

0 Dan O'Rourke over 13 years ago in reply to Ben-Zion Elishkov

Intellectual 255 points

I do a reset and then retry; seems to work well on the bench will see how it holds up in the field.

    err = I2CMasterErr(I2C0_MASTER_BASE);
   if (err !=0)
   {
       I2CMasterControl(I2C0_MASTER_BASE,I2C_MASTER_CMD_BURST_SEND_ERROR_STOP);
       SysCtlPeripheralReset(SYSCTL_PERIPH_I2C0);
        I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(
                                SYSTEM_CLOCK_SPEED), false);
       ul_i2c_timeout=0;
       while (I2CMasterBusy(I2C0_MASTER_BASE))   //wait till done
       {
           ul_i2c_timeout++;
           if(ul_i2c_timeout > I2C_TIMEOUT_MAX){break;}
       }
       I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, i2cCurrentAddress, I2C_WRITE);
       err = I2CMasterErr(I2C0_MASTER_BASE);
       if (err==0)       //reset successful
       {
           err=2;   //retry
       }

0 Ronaldo Pace over 13 years ago in reply to Dan O'Rourke

Intellectual 875 points

Hi Dan,

I can see you're using some code I posted here before, I'm glad it's helping other people.

I remember I struggle for long time to make it work because of this line necessary during the I2C Setup, before calling GPIOPinConfigure:

GPIOPinUnlock(GPIO_PORTB_BASE, GPIO_PIN_7); // I hate so much TI for this function, so necessary and so poorly documented!

yes, that is the real comment on my code.

hope it helps

C2000™︎ microcontrollers

C2000 microcontrollers forum

F28M35 I2c error