simple_piano.bas

PICBASIC program for PIC16F876A. This is the code for piano.

'Program: Simple_piano.bas
'Description: Use Pushbutton unit and speaker unit to build a simple piano
'             which plays "Do" note when Button 0 is pressed. Similarly for
'             other "Re", "Mi" and "Fa" notes.

Define LOADER_USED 1    'Required for bootloader to program the MCU
' ---[ Ports and Variables initialisation]------------------------- 
ADCON1 = 7              'All digital input for Port A 
TrisA = %11111111       ' which used for pushbutton
TrisC = %00010000       'Configure I/O pins for Port C. 
PortC = %00000000       'Initialise Port C 
cl  var byte

' ---[ Main Code ]----------------------
Main:                   'Label. Main program starts here
    BUTTON porta.2,1,255,1,cl,1,playdo   'Check the Button 0. If pressed, then goto playdo
    BUTTON porta.3,1,255,1,cl,1,playre   'Similarly do the same check for other buttons
    BUTTON porta.4,1,255,1,cl,1,playmi   '  i.e. Re, Mi, and Fa
    BUTTON porta.5,1,255,1,cl,1,playfa
    goto main

playdo:
    freqout PortC.5, 500, 1047
    goto Main                                          

playre:
    freqout PortC.5, 500, 1175
    goto Main                                          

playmi:
    freqout PortC.5, 500, 1319
    goto Main                                          

playfa:
    freqout PortC.5, 500, 1396
    goto Main                                              
end