TPS65988DJEVM: I2C communication for TPS65988

Victor Hansen

Prodigy 80 points

Part Number: TPS65988DJEVM
Other Parts Discussed in Thread: TPS65988, TPS65987

Tool/software:

Hello TI forum.

I have been struggling for some time to solve this issue, but without success.

I want to use an Arduino Uno connected through the I2C pins to the TPS65988 evaluation board for two purposes:

One scenario where the Arduino will act as external memory and wait for the TPS to request data at startup
One scenario where the Arduino will actively tries to write the configuration data to the TPS65988 registers

Unfortunately I have had several issues:

Attempts at writing to registers did not cause the register data to change when reading back
I have tried to understand the use of 4CC, but didn't get any significant results in this regard
When using the customization tool, I don't seem to be able to export my configuration to the device RAM, see pictures below for use with TIVA. Note, this was attempted with the Arduino removed from the system in order to avoid any possible interference.

This is in spite of when I use the adapter settings, everything seems fine. Below is a picture of the Adapter Settings and a picture of what I read out with my current code running on the Arduino Uno.

I hope you can help me resolve this issue.

Thanks in advance,

Best regards
Victor

7 months ago

0 Victor Hansen 7 months ago

Prodigy 80 points

An update to this, it seems that my Arduino code for writing register values over I2C is working better, but the data I write to the TPS65988 does not match what the TPS65988 then sets as its configuration, when I read the device settings through the GUI (I still can't export settings in the GUI, but it seems I am able to extract data).
I have attached my code here for reference.

main.cpp TPS_config.h

0 Chris Sterzik 7 months ago in reply to Victor Hansen

TI__Guru 63391 points

Hello Victor,

I am not seeing how you use the Patch Bundle Update tasks to update the memory. Please refer to these documents:

/cfs-file/__key/communityserver-discussions-components-files/196/SPI_5F00_Less_5F00_EC_5F00_Based_5F00_Host_5F00_Programming_5F00_Over_5F00_I2C_5F00_slva972a.pdf

https://www.ti.com/lit/ug/slvubh2b/slvubh2b.pdf

https://www.ti.com/lit/an/slvae21a/slvae21a.pdf

Regards,

Chris

0 Victor Hansen 7 months ago in reply to Chris Sterzik

Prodigy 80 points

Thank you very much, I was unaware of the "TPS65987 and TPS65988 SPI Less Host Programming Over I2C" document, this has helped me out a lot. However, I am wondering what the difference between primary and secondary command/data interface is used for? Can they be used interchangeably or are they dedicated to certain commands and data?

0 Chris Sterzik 7 months ago in reply to Victor Hansen

TI__Guru 63391 points

Hello,

The I2C1 and I2C2 can be used interchangeably. The I2C1 can be configured as a controller.

https://www.ti.com/lit/ds/symlink/tps65988.pdf#page=38

Regards,

Chris

0 Victor Hansen 7 months ago in reply to Chris Sterzik

Prodigy 80 points

Hello again Chris.

If you have time to review my code for a moment to see if there is anything I am missing I would be very grateful as it part of my final masters project :). It seems to me that there is an issue when I try to load the code into the data register, but I can't figure out what goes wrong. Is it an issue with how the registers are treated as little endian?

Thanks in advance.

Regards,
Victor

config_image.h 7534.TPS_config.h 7534.main.cpp

0 Victor Hansen 7 months ago in reply to Victor Hansen

Prodigy 80 points

So, a bit more context to focus on where my code does not work.
First of, a memory issue caused the issue with the data register, which should now be solved. However, it does not seem to me that my code has the intended effect.

As I understand the 4CC flow, if the eval board is in "APP " mode, which it is when I power it on, I cannot send a new configuration file over I2C, as it needs to be in "PTCH" mode to do this.
So I start by sending a PTCr command to reset the patch firmware, where I write to the data register as shown here

I then try to read register 0x03, which returns "APP ", where I would have expected "PTCH".

The code then continuous and tries to start PTCs, which it attempts for 100 times with a 5ms delay in between. As the IC does not seem to be in the right mode, this naturally fails.

Is there any way for me to do further checks for debugging or is it related to how I upload the data to the DataX register before sending the command?
Revised code with solved memory issue attached.
6663.main.cpp 0486.config_image.h

Thanks in advance.

Kind regards,
Victor

0 Chris Sterzik 7 months ago in reply to Victor Hansen

TI__Guru 63391 points

Hello,

I will need some time to review the code but will try to close by the end of the week. Will that be in time?

Chris

0 Victor Hansen 7 months ago in reply to Chris Sterzik

Prodigy 80 points

Hi Chris, that sounds great, I would be very grateful for the assistance.

Victor

0 Chris Sterzik 7 months ago in reply to Victor Hansen

TI__Guru 63391 points

Victor Hansen said:
Hi Chris, that sounds great, I would be very grateful for the assistance.

ok. will do.

0 Chris Sterzik 7 months ago in reply to Chris Sterzik

TI__Guru 63391 points

Hello,

Victor Hansen said:
So I start by sending a PTCr command to reset the patch firmware, where I write to the data register as shown here

I do not believe that is correct: AppConfigReset (1), DevicePatchReset (1), DevicePatchResetKe (0xBE) and AppConfigResetKey (0xEF). Please refer to the device TRM and also this example:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1177970/tps65988-problems-with-applying-patch-bundle-i2c-spi-less

Victor Hansen said:
I then try to read register 0x03, which returns "APP ", where I would have expected "PTCH".

Confirm the operation of the 4CC commands with the corresponding output.

Please find the attached:

/cfs-file/__key/communityserver-discussions-components-files/196/main_5F00_comments.cpp

Victor Hansen said:
"TPS65987 and TPS65988 SPI Less Host Programming Over I2C" document,

Please see section 3.1.3 Example Code and how the Patch Ready interrupt as well as the 4CC command output data is used to confirm operation.

Regards,
Chris

0 Victor Hansen 7 months ago in reply to Chris Sterzik

Prodigy 80 points

Hello Chris

Thank you for the support.
Unfortunately, I am still facing issues. I do not know if this issue is related to my original issue, which is still an issue, but it seems to me that the first byte when reading back is not correct when I inspect the serial monitor, see attached picture. Is there a timing requirement I am missing since I keep reading back incorrect data, which in many cases seems to be 04?

What I have changed:
The repeated lines comes from a while loop that waits for ReadyForPatch.
I added the reset keys in the data register write
I have used the minimum header as by the suggestion of the other thread.

I have attached the edited code.

Thanks in advance.

Kind regards,
Victor

3113.main.cpp min_header.h

0 Aya Khedr 7 months ago in reply to Victor Hansen

TI__Mastermind 30092 points

Hi,

TI U.S. is on Holiday today. Please expect some delay in responses.

Best Regards,

Aya Khedr

0 Chris Sterzik 7 months ago in reply to Victor Hansen

TI__Guru 63391 points

Hello Victor,

The first byte is typically the size of the register, read back 5 bytes, byte 0 is the size and bytes 1-4 are the payload.

Regards,
Chris

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TPS65988DJEVM: I2C communication for TPS65988