' Name        : ADCIN1934X.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : MPASM
' Target PIC  : 40-pin 16F1934 or similar
' Hardware    : LAB-X1 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : ADCIN, LCDOUT
' Description : PICBASIC PRO program to display result of
' 8-bit A/D conversion on LCD. Connect analog inputs to
' channels 0, 1, 3 (RA0, 1, 3).
'


' 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_CLOCK    4   ' Set clock source Fosc/4
Define ADC_SAMPLEUS 50  ' Set sampling time in uS

adval Var Byte          ' Create adval to store result

   Gosub Init           ' Hardware initialization routine

mainloop:
   Lcdout $fe, 1        ' Clear the LCD

   Adcin 0, adval	    ' Read the first ADC channel
   Lcdout "0=", #adval	' Send it to the LCD

   Adcin 1, adval	    ' Read the second ADC channel
   Lcdout " 1=", #adval	' Send it to the LCD

   Adcin 3, adval	    ' Read the third ADC channel
   Lcdout " 3=", #adval	' Send it to the LCD

   Pause 200            ' Delay for time to read the display
   Goto mainloop        ' Do it forever
   
 Init:
   ANSELA = 11   ' Set PortA 0, 1, 3 to analog POT inputs
   ANSELB = 0    ' portb all digital
   ANSELD = 0    ' portd all digital
   ANSELE = 0    ' porte all digital
   
   ADCON1 = %01000000  ' Left justify for 8-bit, Fosc/4, +Vref/-Vref = Vdd/gnd
   
   OPTION_REG.7 = 1 ' Disable PORTB pullups
   TRISD = 0        ' PORTD all outputs
   
   Pause 100        ' Wait for LCD to start
   Return  

   End