topic Re: KL25Z ADC PORT MUX PCR (0x07) in Kinetis Microcontrollers

KL25Z ADC PORT MUX PCR (0x07)

Edrianocarlos — Fri, 07 Nov 2014 17:25:58 GMT

Hi.

I am a little bit confusing with this.

I am using processor expert to configure the ADC and it came up with

PORTB_PCR0 &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07)));

why the mux is 07? i have read the manual and the adc would be ALT(0). is this 07 right?

thanks in advance.

Re: KL25Z ADC PORT MUX PCR (0x07)

Jorge_Gonzalez — Fri, 07 Nov 2014 17:46:32 GMT

Hello Edriano:

Yes, the option for ADC in PTB0 is 0x0. Actually the 0x07 is just a mask for the AND operation ( &= ~(...)). So the written value to PORTB_PCR0[MUX] is 000.

Regards!,
Jorge Gonzalez

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Re: KL25Z ADC PORT MUX PCR (0x07)

adriancano — Fri, 07 Nov 2014 18:00:59 GMT

Hi,

What Jorge is saying is just right. Sometimes the code generated by Processor Expert is not easy to understand and you may think that there is a lot of code for a simple PORTB_PCR0 = 0x00; or nothing because this Pin is by default in its Analog alternative.

Regards,

Adrian

Re: KL25Z ADC PORT MUX PCR (0x07)

Edrianocarlos — Mon, 10 Nov 2014 13:22:21 GMT

Hi thanks.

Ok they like to complicate things. know i see they are doing an & and then inverting everything in order to fit.

why can't they just write thinks like we can follow the manual.