Switch in PIC BASIC HELP!!!!

[HenrikOlsson]

Hello again,
I'm sorry but I missed the fact that you wasn't using PBP. In that case it get's a little more complicated, the Select Case (which I don't think PBC supports) can be substitutes with some If Then lines. But the reading and writing of the various register will have to be done with PEEK and POKE and you need to use the datasheet for your particular PIC to figure out which physical adresses the various registers are at.

/Henrik.

[dragan77]

Thanks, a lot Henrik,
but when I try compile your program,I have syntax error!
I am new in programing,can you write me some new code,
about PEEK OR POKE,how you write me last time,
because I do no,t now how I do that!
Thanks a lot again!!!

[dragan77]

One question more!
What you mean line
OPTION.5=1
AND
OPTION.4=0

WHAT I MUST WRITE IN THIS 2 LINES?
Because I have syntax error.

[HenrikOlsson]

Hello,
OPTION.5 = 1 simply sets bit 5 in the option register but like I said in my previous post PBC doesn't support direct register access like that so you'll have to use POKE to write the registers and PEEK to read them. Look at the memory map of the device you're working with. You'll find at which adresses the various registers are. On the 16F628 the OPTION register is at location 80h for example.

Look in the PBC manual on how to use POKE and PEEK.

Why did I want to set bit5 in the option register? That's because it is the bit that select if TMR0 is a timer or counter and I found that information in the section of datasheet dedicated to TMR0.

/Henrik.

[dragan77]

Hello,
I don.t understood how I do that.
I use device PIC16f628,

I just need when I PUSH BUTTON ONE TIME,
then working program 1,
when I push button next time,
go to next program 2,
when I push button next time,
go to next program 3,......

Can you write me code in PIC BASIC code for that,
if you cant,
thanks anyway!!!

[mackrackit]

I have not used Pic Basic so I can not help much but here is a "not very good idea" you might play with while you are working out the register reading Henrik is pointing you to.


Setup a BUT_CHECK routine with a RETURN at the end of it.
In each of the program loops have a GOSUB BUT_CHECK.
The BUT_CHECK routine will check if the button IS pressed and if it is increment a variable by one.
When the code returns to the program running the next line will have something like.
IF BUT_VAR = 2 GOTO PROG 2

Lots of problems with doing it this way but if things are not critical....
When you figure out the registers with Pic Basic you should see how bad of an idea this is.

[BrianT]

Try this idea, it works with PBP in a PIC18F4620 and should work with any PIC that has EEPROM.

I set a byte variable "ProgramState" to 1 in a data statement and write this to EEPROM when the program is loaded into the PIC.

At power up, the code reads the value stored in ProgramState, here set to 1, and jumps to the appropriate code block.

MAIN:
READ 0, ProgramState
If ProgramState = 1 then RunCode1
If ProgramState = 2 then RunCode2
If ProgramState = 3 then RunCode3

If ProgramState > 3 then
write 0, 1 'reset ProgramState to first code block
goto MAIN
endif

RunCode1:
execute codeblock 1
if ButtonDown = 1 then
write 0, 2
endif
goto MAIN

RunCode2:
execute codeblock 2
if ButtonDown = 1 then
write 0, 3
endif
goto MAIN

etc

HTH
BrianT