Basic help for 12F629

[BobK]

Hi Gene,

I was looking at the PBC manual on the MElabs website. Here are some examples of setting the ports. You will also need to have a copy of the 12F629 datasheet to get the register information.

Symbol PortA = 5 'Define PortA register location 
Symbol TrisA = $85  'Define PortA direction register location  
 Poke TrisA,0  'Make all PortA pins outputs 
 
 
 Peek PortA,B0  'Get current PortA pin states to variable B0  
 Bit1 = 1  'Set Bit1 in B0 which will become PortA pin 1 high  
 Bit3 = 0  'Set Bit3 in B0 which will become PortA pin 3 low  
  'Bit0, 2 and 4 will remain unchanged  
 Poke PortA,B0  'Send the new byte to PortA to complete the change
 
 End   

5.23. POKE

POKE Address, Value

Writes Value to the PICmicro MCU register at the specified Address. Special PICmicro MCU features such as A/D converters and additional I/O ports may be written using POKE. POKE is a PICBASIC™ Compiler statement and is not supported on the BASIC Stamp. (See PEEK for more information.)

Poke $85,0 'Write 0 to register hexadecimal 85 (Sets PortA to all outputs)

I also just finished looking for some older examples of programs I wrote in PBC but they are at home on my older computer so I don't have access to them until this coming weekend.

You need to look at the READ.ME file that came with your compiler program to check and see if the 12F629 will work with PBC. I didn't see it in the manual's list. You may be wasting your time with this chip if its not supported!

HTH,

BobK

[Gene Choin]

Thanks for looking. I have the latest Microcode Studio and programming sw and it handles the 12F629 fine.
I've programmed it to do all kinds of functions, but it just won't read the input.

First, I do address the ports, not as TRIS0, but as each port GP1, ... directing them to be inputs or outputs.
I did add the CMCON,7 statement
And SYMBOL CMCON $1f (that was from Another advice).
The programs proceeds through the light flasing, but doesn't change when I ground GP1.
I did have one error Letting B0 = 1. It should be B0=0 to clear register.
BUTTON claims to look at pin 1, what state is is to be when pressed and when it's pressed, what to goto.
It does that but tHe BUTTON command just follows whatever I set B0 at. No update by the BUTTON command from GP1 (pin1).

I tried the "Button.BAS in the examples and it did the same. No workee! BUT, they give you only the code snippet without any setup.

' BUTTON Command
'
' Demonstrate BUTTON command. Prints working variable (in this case B0) to
' show how auto-repeat works. Prints "PRESS" when button is pressed or
' repeated.

Symbol CMCON = $1f
SYMBOL B = pin1 ' Button Input
poke CMCON,7 'all digital
'symbol GPIO=$00001000
'symbol TRISIO=$00001000
Output 0 'Make GPIO0 the Strike output
Input 1 'Make GPIO1 the Run Sense in
Output 2 'Make GPIO2 the Filament Drive out
Input 3 'Make GPIO3 the MCLR in
Output 4 'Make GPIO4 the START LED out
Output 5

Let B0 = 0 ' Zero Button Working Buffer
Loop:
Button B,0,10,5,B0,0,Skip ' Check Button (Skip if Not Pressed)
Pulsout 5, 2000
Goto Loop
Skip:

PULSOUT 4,2000 ' Indicates Button Pressed
Pause 100 ' Visual Pause
Goto Loop ' Forever