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ADC and DAC of a sine wave in PIC18f452

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kakar133

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hi all,
I want to do adc in pic18f452. For verification i am applying a sine wave(amplitude=1v and frequency=2Hz) as an analog input to the pic and want to convert the digital output of pic again to analog sine wave using a dac0808
pic18f452 has a 10bit adc but i have adjusted the input voltage and Vref in such a way that digital output is in 8 bits.
I am using a 11Mhz crystal and MPLAB to build a hex file.
I tried to simulate it in proteus but the wave is not correctly reconstructed at the output.
Kindly help to identify the bug.
Attached are the files: 1) c code for adc(text file) 2)hex file 3)proteus design 4)MPLAB project and workspace
 

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  • adc files.rar
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Hello kakar133
I don't know if you waiting for answer yet. I have the same problem. Try to change the right justified ->Left Justified.
And then replace
Code: 
PORTC=ADRESL;
with
Code: 
PORTC=ADRESH;
With this you will lost the 2 LSB of the 10 bit (of pic ADC).

I hope this will solve your problem. I still have problem because i want to display the result to the LCD and the Left justified make me more problems.
 

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