FAQs
English (US) 日本語 | Japanese 中文 | Chinese (Simplified)

FRDM-KL25Z I2C0 doesn't Work

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

FRDM-KL25Z I2C0 doesn't Work

‎08-22-2015 02:59 AM
742 Views
rutvijtrivedi
Contributor III

Hii all,

 

I am working on frdm-kl25z EVM and i need I2C0 communication protocol for my task.

I need to communicate with CAT24M01 EEPROM which is I2C based using KEIL IDE.

I used PORTB0 - SCL and PORTB1 - SDA line for my task.

EEPROM has been configured with 4.7k Pull-Up at Vcc side .(I also tried 10k and 1k)

I have configured I2C to work with 100Khz then i tried 400Khz and 1Mhz , my clock freq. is 24 Mhz .

i configured I2Cx_F register to get above baud rate as following.

 

I2C_F = 0X1E // For 100 Khz

I2C_F = 0x0E // For 400Khz

I2C_F = 0X02 // For 1Mhz respectively.

 

Now my problem is as below,

 

I observed following results in my implementation.

1) Sometime it works and writes one byte properly.

2) Sometime it works only after unplugging the power cable of FRDM-KL25Z.

3) Sometime it gets stuck into the getting acknowledgement phase in which i m polling for IICIF flag from I2C_S to be reset (0 value) (The brief is given into code).

 

I measured the voltages at pin MCU side and EEPROM side and i got 3.3V .

 

the brief code is attached here.

Please go through it.

 

Any help on this would be great appreciable.

 

Thanks & Regards,

Rutvij.

Original Attachment has been moved to: I2C_sample.c.zip

Tags (2)
0 Kudos
Reply
1 Reply

‎08-25-2015 03:11 PM
532 Views
Jorge_Gonzalez
NXP Employee
NXP Employee

Hello Rutvij:

I checked your code and it seems OK to me, except for the Pause() calls. EEPROM memories have a write cycle time and it seems that you are not providing enough time for it to finish the write process before sending a new command.

Try increasing the pause between write and read.

If this does not work, then it would be useful if you have a scope or logic analyzer to inspect what is going on in the I2C bus. That is the easiest way to debug I2C problems.


Regards!,
Jorge Gonzalez

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

0 Kudos
Reply