MSPM0L1306: Arm-based microcontrollers forum

Sourabh Devarmani

Part Number: MSPM0L1306

Tool/software:

Hi,

I am working on SOFT I2C with MCU MSPM0L1306 (Custom board). In SOFT I2C I want to check for BUS lock condition for that I need to monitor SDA (PA0 with High-Z state configuration used as SDA pin ) line during write operation.

To check bus lock condition, configuring SDA pin as input to read SDA line, the spikes are observed as shown in below image.

This is because of SDA pin when made as input and output again.

How to avoid spikes during configuration of SDA (PA0 pin) pin as output and then again as input?

over 1 year ago

0 Sal Ye over 1 year ago

TI__Mastermind 24485 points

Hi Sourabh,

So you means that when configure the an GPIO from Hi-Z output to input status, then it will have some spikes, right?

Could you check disable Hi-Z mode for PA0, actually PA0 is a ODIO, which is default Hi-Z. Whether has the issue also?

I will also check with this scenarios and see what happens.

B.R.

Sal

0 Sourabh Devarmani over 1 year ago in reply to Sal Ye

Prodigy 90 points

Hi Sal,

I checked by disabling Hi-Z mode for PA0, but still facing the same issue .

Please provide the input on same.

0 Sal Ye over 1 year ago in reply to Sourabh Devarmani

TI__Mastermind 24485 points

Hi Sourabh,

Too busy to to some verification.

While, I find one workaround for this: you can enable output and input simultaneously, then not switch operation is required. I suppose the issues should be fixed.

B.R.

Sal

0 Sourabh Devarmani over 1 year ago in reply to Sal Ye

Prodigy 90 points

How to enable input and output simultaneously?

0 Sourabh Devarmani over 1 year ago

Prodigy 90 points

Hi Sal,

So, you mean that when configure an GPIO from Hi-Z output to input status, then it will have some spikes, right?

--> Yes, correct

Could you check disable Hi-Z mode for PA0, actually PA0 is an ODIO, which is default Hi-Z. Whether has the issue also?

--> Yes, I will check. and update

Thanks

0 Sal Ye over 1 year ago in reply to Sourabh Devarmani

TI__Mastermind 24485 points

Hi Sourabh,

Just after you enable GPIO as output, then enable its input by INENA bit.

Due to input works as Hi-Z, so it won't make impact on output.

Please let me know whether this could solve the issue.

B.R.

Sal

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

TI__Mastermind 24485 points

Hi Sourabh,

Update a demo for enable input and output simultaneously.

mspm0l1306_output_input_demo

It is used with CCS12.8 and SDK 2.02. You can refer to it and modify your SDK example code if your version is not the same.

B.R.

Sal

+1 Sourabh Devarmani over 1 year ago in reply to Sal Ye

Prodigy 90 points

Hi Sal,

Thank you for your reply.

We tried this configuration before and its working, now there is no spikes on I2C communication. We were doing final testing so there was delay to respond.

We checked this mspm0l1306_output_input_demo software, it looks exactly the same what we tried.