AnsweredAssumed Answered

FRDM-KL25Z I2C0 doesn't Work

Question asked by Rutvij Trivedi on Aug 22, 2015
Latest reply on Aug 25, 2015 by Jorge_Gonzalez

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,


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