push button algorithm using PIC

[herry2]

hello guys

I'm design a circuit which have 6 input of ADC, each value of input ADC will be display in LCD, so for that purpose I use 1 push button which have function has selector ( when I push the button one time LCD will display value on first ADC input, when I push the button twice LCD will display value on second ADC, and so on). but I don't have a clue for the algorithm. I'm just a newbie in PIC, btw I'm using assembler languange for program this PIC.

can you help me guys

cheers
raka

 

[Gordz]

If you merely want to cycle through the values then you could

disp1
read adc1
display value 1
is button pressed ?
no = goto disp1
yes
disp2
read adc2
display value 2
wait for button release
is button pressed ?
no = goto disp2
yes
~
disp6
read adc6
display value 6
wait for button release
is button pressed ?
no = goto disp6
yes
goto disp1 ;start from 1 again

There are many ways to do the same thing but as a newbie it may be easier to do it like this to understand the flow you require.

 

[herry2]

thanks, i'll try that algoritm

 

[philba]

That's a lot of code replication. In C like pseudo code

disp = 1
for(;;) {  // this is a loop
    sample disp
    display disp
    if(button pressed)
        disp = disp + 1
        if(disp> 6)
            disp = 1
}

you will need to debounce the switch.

 

[herry2]

thanks philba, but I'm using assembler languange. How to use that C algorithm in assembler languange?

regards
raka

 

[ericgibbs]

thanks philba, but I'm using assembler languange. How to use that C algorithm in assembler languange?

regards
raka

hi,
The algorithm that 'Gordz' has posted will give the result you want.

Are you now saying you want it coded in assembler language.?

 

[herry2]

hi
I'm still working out on 'Gordz' algorithm using assembler languange. Philba give me a new algorithm, so I'm confuse which algorithm I can use? I'm still newbie in programming so if you give me the sample code it will helpfull.

regards
raka

 

[ericgibbs]

hi
I'm still working out on 'Gordz' algorithm using assembler languange. Philba give me a new algorithm, so I'm confuse which algorithm I can use? I'm still newbie in programming so if you give me the sample code it will helpfull.

regards
raka

hi,
As you are using assembler here is a sample program for 3 keys.

To enable you to follow it, its written in Basic, which creates the assembler code, so the annotation may help a little.

EDIT: added the *.bas

 

[Arnold007]

Hi

Thanks, I will try that algorithm.
There are many ways to do the same thing but as a newbie it may be easier to do it like this to understand the flow you require.

__________________________________________________________________
Arnold
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[herry2]

Hii
thanks Gordz, I have try your algorithm and succedd. Btw does anyone who now to set pwm frekwency? I have written assembler but the max frekwency just 71 kHZ, how to increase frekwency pwm to more than 100 kHz ?

init_pwm
bsf STATUS,RP0;
movlw 0x0E;
movwf PR2;
bcf TRISC,0x02;
bcf STATUS,RP0;
movlw 0x2F;
movwf CCPR1L;
movlw 0x1C;
movwf T2CON;
movlw 0x0C;
movwf CCP1CON;
return

 

[CCD]

Hi,
if someone wants my version of the same project using AVR ATmega32, it can be found here along with code in C:

Design with Microcontrollers: 8-Channel ADC Project with ATmega32

Thanks!