FRDM-KL25Z I2C0 doesn't Work

rutvijtrivedi — Sat, 22 Aug 2015 09:59:11 GMT

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

Re: FRDM-KL25Z I2C0 doesn't Work

Jorge_Gonzalez — Tue, 25 Aug 2015 22:11:19 GMT

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

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Kinetis MicrocontrollersのトピックFRDM-KL25Z I2C0 doesn't Work

FRDM-KL25Z I2C0 doesn't Work

Re: FRDM-KL25Z I2C0 doesn't Work