topic Re: I2C_LDD clock problem in Kinetis Microcontrollers

I2C_LDD clock problem

gianlucap_ — Wed, 02 Jul 2014 08:15:15 GMT

Hi,

I'm using KL05 micro and I've a problem with setting of "Internal frequency" on I2C_LDD.

I've 2 clock path:

-CLOCK_CONFIG0: MCGIRCLK =20Mhz, bus 10Mhz FEI

-CLOCK_CONFIG1: MCGIRCLK =2Mhz, bus 667khz BLPI

On my code I need to use I2C in both configuration.

When I try to set init. value on "Timing dialog window" I can't choose a valid value because one value could be right for one clock and wrong for the other.

This is the message

"Timing setting failed in Clock configuration 0 - it is impossible to set the following items: initialization value"

"Timing setting failed in Clock configuration 1 - it is impossible to set the following items: initialization value"

My question is, is it possible to use I2C with both config?

Many thanks

Re: I2C_LDD clock problem

adriancano — Mon, 07 Jul 2014 21:06:52 GMT

Hi,

I am afraid that the dividers of these two configuration do not allow to have a common frequency for the I2C module to work with. You can work with the FEE mode and use a external crystal or external reference clock which allows you to use the dividers to set a common frequency for the I2C module to work with both configurations.

I hope this information can help you.

Regards,

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