' Name        : adcin8x.pbp
' Compiler    : PICBASIC PRO Compiler 2.60
' Assembler   : PM or MPASM
' Target PIC  : 40-pin 16F887
' Hardware    : Lab-X1
' Oscillator  : 4MHz external crystal
' Keywords    : ADC, ADCIN, ANALOG, LCDOUT, LCD
' Description : PICBASIC PRO program to display result of 
' 8-bit A/D conversion on LCD
'
' Connect analog input to channel-0 (RA0)


' Define LCD registers and bits
Define  LCD_DREG  PORTD
Define  LCD_DBIT  4
Define  LCD_RSREG PORTE
Define  LCD_RSBIT 0
Define  LCD_EREG  PORTE
Define  LCD_EBIT  1

' Define ADCIN parameters ********************************
Define ADC_BITS     8  ' Set number of bits in result
Define ADC_SAMPLEUS 50 ' Set sampling time in uS
'Define ADC_CLOCK    3 ' This define is inoperative on 16F88x
ADCON0 = %11000000     ' Set ADC_CLOCK to RC (DEFINE ACD_CLOCK inoperative on the 16F88x)
ADCON1 = %00000000     ' Left-Justify result in ADRESH:ADRESL registers
ANSEL = %00000001      ' Set AN0-AN7 to digital with the exeption of AN0
ANSELH = %00000000     ' Set AN8 and higher channels to digital operation
'**********************************************************

adval Var Byte            ' Create adval to store result


  TRISA = %11111111       ' Set PORTA to all input
  Low PORTE.2             ' LCD R/W line low (W)

  Pause 500               ' Wait .5 second

mainloop: 
  ADCIN 0, adval          ' Read channel 0 to adval

  Lcdout $fe, 1           ' Clear LCD
  Lcdout "Value: ", DEC adval ' Display the decimal value  

  Pause 100               ' Wait .1 second

  Goto mainloop           ' Do it forever

  End