ADC in atmega16 or 32

[Uttam Dutta]

Please help me to understand,

 

First 3 bits og ADCMUX   are for ADC channel selection and if it is 000 means channel 0

         001 means channel 1

         010 means channel 2

 

……

…..

and  111 means channel 7

These thinngs are mentioned in ADC tutorial in

“

How to use inbuilt ADC of AVR microcontroller (ATmega16)“- Description

Also matching with Atmega32 datasheet.

So if I want select channle for ADC then

  ch= ch & 0b00000111; // channel must be b/w 0 to 7

  ADMUX |= ch;

is OK because  0000 0000 AND 0000 0111

 will give 0000 0000

ADMUX  bit pattern will be 0000 0000 – means only channel 0 is selected

 but if we want to use more than 1 channel ,

suppose want to use  ADC channel  0,1,2,3 then

how this can be done, one thing written in many other program

 that ch=ch&0b00000111;
   ADMUX&=0b11100000;
   ADMUX|=ch;

but how it works for all 0 to 7  channel

can anybody please explain it or any other way to use more than 1 channel

of ADC port.

 

 

 

 

 

[Adwaitanand]

I think you should use each channel separately and store it in an Array.

[Author]

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