MSPM0G3507: MSPM0G3507 IIC problem

jerly lei

Part Number: MSPM0G3507
Other Parts Discussed in Thread: MSPM0L1306

I am using the IIC communication of MSPM0G3507, the reference is i2c_tmp_LP_MSPM0G3507_freeftos_ticlang; The parameter is set to:

X0a uint8_t txBuffer [8] = {0x0a, 0x0b, 0x03, 0 x04, 0 x05, 0 x06, 0 x07, 0 x08};

/* Common I2C transaction setup */

i2cTransaction.writeBuf = txBuffer;

i2cTransaction.writeCount = 1;

i2cTransaction.readBuf = rxBuffer;

i2cTransaction.readCount = sizeof(rxBuffer);

i2cTransaction.targetAddress=0x1e;

Use the function: I2C_transfer(i2c, &i2cTransaction);

However, through logic analysis (as shown in the attached picture), When i2cTransaction.writeCount=1,data is 0x00. When i2cTransaction.writeCount=3, data is 0x0a,0x00,0xff.

i think the right result is ：When i2cTransaction.writeCount=1,data should be 0x0a. When i2cTransaction.writeCount=3, data should be 0x0a, 0x0b, 0x03

writeCount=1

writeCount=3

over 2 years ago

0 Cash Hao11 over 2 years ago

TI__Mastermind 46015 points

Hi,

I tried your code. However, I saw the results are fine.

controller SW:

target SW: i2c_target_rw_multibyte_fifo_interrupts_LP_MSPM0L1306_nortos_ticlang

Best regards,

Cash Hao

0 jerly lei over 2 years ago in reply to Cash Hao11

Prodigy 20 points

Hi Cash:

I have tried again and the result was always that.

Your device is MSPM0L1306,and mine is MSPM0G3507,is it possible that the result was different because the device was different?

By the way,I need to use MSPM0G3507to read and write EEPROM(24C02),which demo code do i need to use?

Thanks

0 Cash Hao11 over 2 years ago in reply to jerly lei

TI__Mastermind 46015 points

Hi,

I am using the MSPM0G3507 as the Controller. The L1306 is used as the target. It the same as yours.

For no-rtos, you can check on this demo code i2c_controller_rw_multibyte_fifo_interrupts.

Best regards,

Cash Hao

0 jerly lei over 2 years ago in reply to Cash Hao11

Prodigy 20 points

I have read this code, it seems that the implementation for EEPROM read and write operations is not readily available or straightforward to achieve.

0 Cash Hao11 over 2 years ago in reply to jerly lei

TI__Mastermind 46015 points

Hi，

I searched in the bucket but we do not have an example perfectly suitable for a EEPROM application.

You might need to modified the example code for your application.

Best regards,

Cash Hao

0 jerly lei over 2 years ago in reply to Cash Hao11

Prodigy 20 points

Another question, the valid range for device address is 0x00-0x7f, but the address for EEPROM is 0xa0.

+1 Cash Hao11 over 2 years ago in reply to jerly lei

TI__Mastermind 46015 points

Hi,

The address is 7-bits long in the MSPM0 I2C module. So, the valid range should be 0x00-0x7f. However, in some cases, it will add the R/W bit and combine to a 8-bits long byte. So in your case, if the EEPROM is 0xa0. You can try move one bit right 0xa0 ->0x50 as the 7-bits long target address.

Best regards,

Cash Hao

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MSPM0G3507: MSPM0G3507 IIC problem