adc issue

[rverm]

The newest version has a adc issue. It displays data in 16 bit but the adc is only 10 bit. I dont why its doing this problem. I have tried declaring it ,like in the examples in the manual but it still comes up as 16 value. up in a 16 bit value. I have emailed the proteaus people about this issue but there in denial about it. A 16 bit value is good just wished the chip had one. Im using a 18f2420 in my simulation. Let me if anyone else has this problem.

Hi, its great to see you visiting our forum. Why not try Proton Compiler for FREE? Download the FREE version of Proton Compiler, Its called Amicus18 and its available from HERE Already using proton Compiler??? Get rid of these pesky messages... get LICENSED USER STATUS

[wastrix]

Please post code, but I'm sure this is not an issue, rather if you look at the number in binary you will see that it is a 10-bit number that is left-justified. You will need to consult the datasheet to right-justify the result and get a 10 bit value, or, shift the value right 6 places.

Has the same code worked in older versions of Proteus and/or real life?

[rverm]

No it goes from 0 to 65500 on the lcd display. I will post code later.

[glenlivet]

Sounds to me that you should DECLARE your ADC variable as a WORD which is 16-bits wide.
Even though your ADC is only 10 bits you have to DECLARE it as a WORD. When you do a conversion the upper 6 most significant bits will be zero's by default. Hope this helps

[rverm]

Ill put the program in a chipand see if it is proton or isis .

[wastrix]

When you do a conversion the upper 6 most significant bits will be zero's by default.

Not if the ADC result format is left-justified, in which case the 6 least significant bits would be 0; you will get a 16 bit number with 10 bit accuracy.

The following code works perfectly in ISIS:

Device = 18F2420

Dim result As Word

ADCON2.7 = 1

result = ADIn 1

Cls

Print Dec result, $FE, $C0, Bin16 result

The following code gives problems like you describe:

Device = 18F2420

Dim result As Word

result = ADIn 1

Cls

Print Dec result, $FE, $C0, Bin16 result

Are you sure you have right justified the data?

[rverm]

That nailed right on head. I guess i better go back and look over all the registers again. I used set them up that way.
Thanks again.