MSPM0G3507: I2C read operation exception

?? ??

Part Number: MSPM0G3507

一：Individual I2C write operations without problems

二：I2C read operation exception, written according to the underlying case of tii, a TRANSACTION SEND EXCEPTION.

But looking at it with a logic analyzer, I see that none of the written registers match the 0X0F register I passed in, and there are no read operations.

三：By write operation and then read operation, the first read is fine, the second re-read is abnormal.

normal：

abnormal：

Why is it an exception after a read operation? I have a sensor that is NACK after a read operation.

Is it necessary to do something to restore the I2C state after a read operation

over 1 year ago

0 Sal Ye over 1 year ago

TI__Mastermind 24095 points

Hi,

SDK gives several IIC related projects for user reference, you can download it from www.ti.com.

Below is a screenshot for your reference:

B.R.

Sal

0 ?? ?? over 1 year ago in reply to Sal Ye

Prodigy 75 points

Hi,

I'm currently using the TI-DRIVER case demo, using the function interface bool I2C_transfer(I2C_Handle handle, I2C_Transaction *transaction)

Can you explain about the case of ti-driver, why the exception after the read operation.

dev.ti.com/.../_i2_c_8h.html

0 Sal Ye over 1 year ago in reply to ?? ??

TI__Mastermind 24095 points

Hi,

I am not familiar with this demo project. I think I can't help more with the issue.

It seems a example project for RTOS, if you do not need RTOS, I will suggest you use the driverlib project showed before.

If this is what you application requirement, I suggest you can check the low level of IIC transfer code, it should set the transfer behavior of "target address, read/write, ACK. STOP, ,,,".

B.R.

Sal

0 ?? ?? over 1 year ago in reply to Sal Ye

Prodigy 75 points

We are currently running on top of freertos, and the I2C_transfer function underneath doesn't see much about the I2C status registers

0 Sal Ye over 1 year ago in reply to ?? ??

TI__Mastermind 24095 points

Hi,

?? ?? said:
We are currently running on top of freertos, and the I2C_transfer function underneath doesn't see much about the I2C status registers

It will call below function to process IIC register:

B.R.

Sal

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MSPM0G3507: I2C read operation exception