is there a better way to do this

[pdl]

Hi Guys

is there a better way to do this.

i echo the 4 inputs from port a to 4 outputs on portb a button selects which half of port be the outputs.

Pete

#include <16F627A.h>
#fuses NOWDT,INTRC_IO, NOPUT, NOPROTECT, BROWNOUT, NOMCLR, LVP, NOCPD
#use delay(clock=4000000)

int axis = 0;
int1 but = 0;

zaaxis(void) {
axis = input_a() &0xf;
output_b(axis);
}


xyaxis(void) {
axis = input_a() &0xf;
output_b(axis << 4);
}

butpress(void){
if (input(PIN_A4))
{
while (!input(PIN_A4));
but=1;
delay_us(500);
}
}

butpress1(void){
if (input(PIN_A4))
{
while (!input(PIN_A4));
but=0;
delay_us(500);
}
}


void main(void)
{
while(1)
{
butpress();
butpress1();
delay_us(500);
if (but==0)
{
output_low(PIN_A6);
xyaxis();
}
else
if (but==1)
{
output_high(PIN_A6);
zaaxis();
}
}
}

[ckielstra]

When posting code please use the Code button to preserve the layout of your program. Press this button just before pasting your code and once again after pasting your code.

[pdl]

ok new to all this but am trying. Very some times

when i press the button to select the lower or upper bits on port b it doesnt move the bits.

Pete

[ckielstra]

Which compiler version are you using? You can find this in the header of the *.lst file.

Pins on the PIC processor can be used for multiple functions, for example the pins on port A are multiplexed with the A/D converter and comperator modules. Try disabling the other functions by adding the following lines to the start of your main():

[pdl]

Hi i am using 3.222

Pete

[ckielstra]

Have you tried my suggested modifications?
- Changing LVP fuse to NOLVP
- Adding the code for disabling a/d converter and comparators
- Testing the pin A6 for changing logic level when you press the button.

And what are the results?

Sorry, but we can't read your mind so give as much information as you can.

[pdl]

Hi ckielstra

i have done the mods that you stated the 627 has no ADC's only comparators.

the code works like this what ever is on lower 4 bits of portA are echoed to the lower 4 bits of portB if you press the button on port a and release the button the 4 bits should move to portB upper 4 bits.

it does not switch from the lower 4 bits to the upper 4 bits reliably

Pete

[Humberto]

Hi Pete,

Pls could you describe the hardware of your circuit ?
- how did you connect the buttons.
- how did you connect the inputs in PA
- how do you read the outputs in PB
- did you tested your hardware with a simple led blinking test to be sure that the micro is alive and running ?
- did you make ALL the suggested changes ?


Humberto

[ckielstra]

I looked again at your code and the error is in the way you detect the button pressed. Do some cleaning up because right now your code is very confusing. Try adding some comment and look at the notes I added below.

1)

[pdl]

Hi Humberto

my code is in the first post

PA are 5 switch tide low with a 10k resistor pulled to 5v+ when switch pressed and 1 led to tell me if the lower bits or higher bits of PB is selected


PB outputs have 8 leds on them when the port gose high the leds lights

yes all changes have been done

hope this helps

Pete

[pdl]

Hi Guys

Here is the code with all mods

Pete

[pdl]

This code sort of works the only thing with it is the selector button on PortA Ra4 is unreliable.

This button should be one click to select the lower 4 bits and another click to select to upper 4 bits on Port B

Pete

[rwyoung]

Your method of debouncing the button press seems a bit dodgy.

[pdl]

Hi Guys

The button PortA works every time but i have to hold it in.

i need 1 press to select lower 4 bits of portb and press the same button again to select the upper 4 bits.

Pete

The state of the code at the minute is

[Humberto]