[SOLVED] Problem with reading the ADCH value when using the ADC of ATmega32

[jayanthyk192]

Hi,

I was trying to use the adc of my atmega32 MC.i wrote a code in which the a/d conversion was being done and value sent serially to computer.adc not in free running but continuously converting.the serial data transmitted was only of the ADCL and i did'nt read the ADCH value at all.due to this the serial data(adcl) was not updated.but then i read the adch value along with adcl value.now the serial data started to change according to input and updated continuously.can anyone please tell me if they are designed in such a way that only after both registers are read the next value is updated or is it any other problem?

Thank you.

 

[alexan_e]

Re: atmega32 adc problem

Please read https://www.edaboard.com/threads/242404/#post1037049

Alex

 

[jayanthyk192]

Re: atmega32 adc problem

Please read https://www.edaboard.com/threads/242404/#post1037049

Alex

Thank you,that was the same problem i had. can you please attach the datasheet you mentioned in the link. it might help me later.

 

[alexan_e]

Re: atmega32 adc problem

This is mentioned in every datasheet of AVR, in your case for mega32 it is http://www.atmel.com/Images/doc2503.pdf at the end of page 217.
There is also a section in page 203

Alex

 

[jayanthyk192]

Re: atmega32 adc problem

This is mentioned in every datasheet of AVR, in your case for mega32 it is http://www.atmel.com/Images/doc2503.pdf at the end of page 217.
There is also a section in page 203

Alex

thank you.