ADC.bas

be80be · Post by **be80be** » Thu Dec 13, 2012 5:52 am

Been trying to use the ADC.bas in 8 bits reading ADRESL but i get 255 to 0 from VDD to middle of the pot then it jumps to 255 to 0 middle to grd.

The 10 reading work fine

I tested it with this code

Code: Select all

Dim Variable As Word
Dim Variable1 As Word

SetBaudrate(br19200)
Variable = 0
While True
  ADC.Read (0)
  DelayMS(500)
  Variable = ADResult    // 10 bit reading
  Variable1 = ADRESL  //8 bit reading
  
 
 USART.Write("Decimal : ", DecToStr(Variable), 13, 10)  // decimal number
 USART.Write("Decimal : ", DecToStr(Variable1), 13, 10)  // decimal number
 
 DelayMS(500)
Wend

RangerBob · Post by **RangerBob** » Thu Dec 13, 2012 9:54 am

What device are you using?

Some of the newer devices have some really funky ADC set-ups which I imagine the standard ADC.bas module can struggle with.

be80be · Post by **be80be** » Thu Dec 13, 2012 1:46 pm

Pic18f2550 I want the 8 bit reading but i get double.

I'm thinking i've gone crazy can't see where it's reading wrong the adc bas has the right setting

Senacharim · Post by **Senacharim** » Thu Dec 13, 2012 3:02 pm

What does the spec for the 18f2550 say the ADC returns? If it's a 10-bit number, then you'll just need to scale it down to 8 bits if you need 8 bits.

You can do it!

be80be · Post by **be80be** » Thu Dec 13, 2012 4:12 pm

Ok I feel like a nut I set rightjustify to false that puts the right 8 bits in ADRESH 0 to 255 It reads like I should

Thanks for waking me up Senacharim they put me on some med's for diabetes I think it's slowed my thinking way down.