DS90UB954-Q1: Continues I2C reading with ALP in Python? Decreasing of SCL frequency

Torsten Dr. Kilias

Intellectual 475 points

Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: ALP, USB2ANY

Hi,

we intend to read back EEPROM data with ALP as a Python script.

The syntax seems to be correct:

print " EEPROM Scan ",board.ReadI2C(addr,0x00,0x0f)

leads to

EEPROM Scan [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

But we do not get any ACK, may be the SCL frequency (almost 400kHz) is to high.

How to decrease (standard I2C frequency should be 100kHz)?

regards

Torsten

over 5 years ago

0 Vishy Viswanathan over 5 years ago

TI__Mastermind 21685 points

Torsten,

ALP scripting does not support a command to change I2C communication bit rate. It is set as 400kHz. Are you using UB954 EVM? Or is it custom hardware with UB954 and EEPOM on the same I2C bus? One option would be use the USB2ANY explorer software tool. You can find it by the link below

http://www.ti.com/tool/USB2ANY

Instead of ALP, you can connect to EEPROM through this tool, select i2c speed, and access the data. You have to quit ALP to successfully connect with this tool.

Thanks,

Vishy

0 Torsten Dr. Kilias over 5 years ago in reply to Vishy Viswanathan

Intellectual 475 points

Hi, Vishy,

thanks for your answer.

We use an inhouse developed board with 960 and 934 ...

In most cases fixed I2C rate is completely sufficient.

Good idea to apply explorer of USB2ANY (I installed it month before).

It should work!

Regards

Torsten

0 Vishy Viswanathan over 5 years ago in reply to Torsten Dr. Kilias

TI__Mastermind 21685 points

Torsten,

Thanks for update. I have seen this tool asking you update to the latest firmware 2.8. You don't have to update just leave it with the current version 2.7.

Thanks,

Vishy

0 Torsten Dr. Kilias over 5 years ago in reply to Vishy Viswanathan

Intellectual 475 points

Hi, Vishy,

yes, I was asked to update USB2ANY firmware and I did it.

But there could be a buck, because all the time I start USB2ANY or ALP again, I will be informed to update again.

Regards

Torsten

0 Torsten Dr. Kilias over 5 years ago in reply to Torsten Dr. Kilias

Intellectual 475 points

Sorry, I meant "bug" - buck was soldered to our pcb!

0 Vishy Viswanathan over 5 years ago in reply to Torsten Dr. Kilias

TI__Mastermind 21685 points

Torsten,

The USB2ANY tool firmware (2.8) uses latest DLL that does firmware version checking. See if you can roll back the firmware version to 2.7. You can find the older firmware under the following folder

C:\Program Files (x86)\Texas Instruments\Analog LaunchPAD v1.57.0010\Drivers\i2c_controllers\usb2any\Firmware

Note this folder is available when you update to latest ALP_PROFILE_UPDATE (version v06) from TI.com.

http://www.ti.com/tool/ALP

ALP uses firmware v2.7 and USB2ANY.dll (v2.7.0). If the messages doesn't go away, you might have to uninstall the USB2ANY software so that ALP's USB2ANY DLL becomes default.

Thanks,

Vishy

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DS90UB954-Q1: Continues I2C reading with ALP in Python? Decreasing of SCL frequency