AM335x compiling example code from the sdk

Jenny Liew

Hi all,

I have installed ti-sdk-am335x-evm-08.00.00.00 and AM335X_StarterWare_02_00_01_01 on my ubuntu machine. Also I have gone through the lab exercise from http://processors.wiki.ti.com/index.php/Linux_Training:Introduction_to_Cross_Compiling. I can build the MPEG audio decoder library from the exercise. But I don't know how to compile the example code provided by the SDK. I'm interested on the I2C example code.

So i thought I try and check my sdk and my pc has been configured correct, then I have create a new project on the eclipse and I have add all the paths but on my eclipse, it still complains the functions call cannot be resolve.

Any advice please?

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Jenny Liew said:
But I don't know how to compile the example code provided by the SDK

Which SDK? Linux SDK has no example code. It includes drivers for I2C. Starterware is not supported on this forum. There is a dedicated forum for it: https://e2e.ti.com/support/embedded/starterware/f/790

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Hi Biser,

Sorry, I should have explain more. I have the am335x starter kit and installed ti-sdk-am335x-evm-08.00.00.00 and AM335X_StarterWare_02_00_01_01. I have connect a device to this board at J8 (which is the I2C) and I try to read some data from the device.

The ti-sdk-am335x-evm-08.00.00.00 isn't the SDK for the am335x? I'm trying to figure about how to use the I2C driver from the SDK. Does it mean I can use the I2C library from the SDK do all work (such as #include <linux/i2c-dev.h>)? sorry for all the silly question, i'm kind of new on all this.

Thanks.

Regards,
jenny

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

This wiki gives a description of the Linux I2C interface: http://elinux.org/Interfacing_with_I2C_Devices

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Hi Biser,

Thank you so much for the link. I did try the partial code from the example, but couldn't read from my device. The problem is i don't know what address of my device is.
"Opened /dev/i2c-1 successfully
success to acquire bus access
Failed to read from the i2c bus.
Remote I/O error"

I tried to run i2cdetect -y -r 1, i got this result,

root@am335x-evm:/test# i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- UU -- -- UU -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- UU -- --
30: -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- --
40: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: UU UU -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@am335x-evm:/test#

I tried to googled around, some people says UU means is a device conflict. I have solder my device (electronic configuration plug, it store some data on to it) to the 4 pins of J8 on the am335x board, and my device is attached to it. Is there any where I can find out the address of the device?

Thanks.

regards,
jenny

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

Status "UU" means "Probing was skipped, because this address is currently in use by a driver. This strongly suggests that there is a chip at this address." As for the exact physical I2C address, this can be found only in the device datasheet.

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Hi Biser,

I did manage to work the I2C work but I think I accidentally corrucpted the Baeboard ID memory (which I wrote to the EEPROM Baseboard ID Memory with a testing data). After rebooting my AM335x board, I couldn't boot up the board. Is there any way to reset the EEPROM to the default settings to boot up with the SD card?

Thanks.

Regards,
jenny

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

What is the revision on your AM335X GP EVM baseboard? The ID EEPROM should be write-protected on all revisions before 1.6. You can find the EEPROM contents here: http://processors.wiki.ti.com/index.php/AM335x_General_Purpose_EVM_HW_User_Guide#I2C_ID_Memory

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Not sure, I saw there's a serial code sticker on the board and it shows ver1.2D. The board couldn't boot up and the LCD is not show any thing on the screen, only LED D5 PWR ON is flashing when i press the power on button. What should I do to get the board boot up again?

Thanks.

jenny

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

What board is this? GP EVM or Starter Kit?

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

It's the AM355x Starter Kit.

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

Do you see a "CCCCC..." string on your terminal? If you don't, probably the board has failed.

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Hi Biser,

No "CCCC.." string but I have some error message which I got the print screen from my hyperterminal.

Looks like my EEPROM got corrupted, is there any way to resolve it? It said Reset the board, How could I do it?

Do i need to send back to reprogram the EEPROM on this board?

Thanks

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

Yes, that's EEPROM corruption. You can reprogram yourself. Follow these instructions: processors.wiki.ti.com/.../AM335x_Starter_Kit_ID_Memory_Programming

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Thanks Biser. I managed reprogram the EEPROM.

However, I did manage to read the data from my I2C device but it read from register address randomly. How can I always read from the beginning of the register address?

I noticed there's I2C driver like you said previously, ti-sdk-am335x-evm-08.00.00.00/board-support/linux-3.14.26-g2489c02/drivers/i2c/i2c-dev.c
and ti-sdk-am335x-evm-08.00.00.00/board-support/linux-3.14.26-g2489c02/drivers/i2c/i2c-core.c etc. How can I use all these for my code?

Thanks.

Regards,
jenny

0 Biser Gatchev-XID over 8 years ago in reply to Jenny Liew

TI__Guru**** 393215 points

Check this article: http://elinux.org/Interfacing_with_I2C_Devices

0 Jenny Liew over 8 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Thanks Biser! it works.

Best Regards,
jenny

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AM335x compiling example code from the sdk