28069 control suite eeprom example

Brent Williams

Hello,

I currently have a 28069 control card that I have wired up a eeprom to via I2C. I am using CC5 version 5.5.0.00077.

I can run the example and it passes (i.e. it writes 2 bytes and reads 2 bytes successfully from the eeprom).

When I change the number of bytes to anything larger than 2 (via the I2C_NUMBYTES #define at the top of the file) it does not complete the transactions and the reported status is I2C_MSGSTAT_WRITE_BUSY.

Any idea what I could be doing wrong?

Thanks,

Brent

over 9 years ago

0 Gautam Iyer over 9 years ago

Guru 192875 points

Hi Brent,

If you check the comment section of the code: "This program will write 1-14 words to EEPROM and read them back."
Hence, it means that you should be able to write more than 2 words. I hope you're not missing any configuration.
Check this thread: e2e.ti.com/.../69739

Regards,
Gautam

0 Brent Williams over 9 years ago

Expert 1065 points

Hi Gautam,

Thanks for the response. I will take a look at the link.

The only changes I am making to the example are changing the #define I2C_NUMBYTES from 2 to another number and adding the extra data bytes I want to send to I2cMsgOut1. Other than that the example code is not changed.

Thanks again,

Brent

0 Fulano de Tal over 9 years ago

Expert 2090 points

Check these
e2e.ti.com/.../395001
e2e.ti.com/.../396644

0 Brent Williams over 9 years ago in reply to Fulano de Tal

Expert 1065 points

Thank you the second has the answer =>

Unfortunately you have hit on a limitation of the I2C FIFO. There is a misleading comment in the header file example leftover from another device that has a 16 byte FIFO. The number 14 below should say 2.

// Global variables
// Two bytes will be used for the outgoing address,
// thus only setup 14 bytes maximum
struct I2CMSG I2cMsgOut1={I2C_MSGSTAT_SEND_WITHSTOP,
I2C_SLAVE_ADDR,
I2C_NUMBYTES,
I2C_EEPROM_HIGH_ADDR,
I2C_EEPROM_LOW_ADDR,
0x12, // Msg Byte 1
0x34}; // Msg Byte 2

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28069 control suite eeprom example