P8X32A Resistive Touch Buttons Problem

crispycret

This is my first elctro-device I am playing with. I have no experience in STAMP obviously but i do in C. I went through the propeller tutorials with no problem until i got to the Simple Circuts tutorial. I am having trouble programming the Resistive Touch Pad. I can set the the I/O Pin to High and Low, but only in code.


How do I detect if the Touch Pad has been, well touched.

I took a look at this page that has an example of how to use the Touch Pads but I need one in C.

http://microcontrollershop.com/product_info.php?products_id=4872

I also skimmed through the simpletools.h info page from the SimpleIDE Reference Page.

Sawmiller

here's one i'm playing with. have to dampen my finger thou

/*
  robo lights....
 
*/

#include "simpletools.h"                      // Include simple tools


int  testbuttons();


int i;
volatile int temp = 0;

int main()    // Main function
{
                                                                             
  //cog_run(&testbuttons, 40);  
                                    
  while (1)
  {
                         
    
    if(testbuttons())                  // check the buttons, if P7 is pressed, blink the lights
    {
      for(i=16;i<=23;i++)
      {
        high(i);
        pause(50);
      }
    
      for(i=23;i>=16;i--)
      {
        low(i);
        pause(50);
      }
      pause(100); 
    } 
    temp = 0;
              
  }    
             
}

int testbuttons()      // test the 7 button on quickstart board
{
   
  high(7);
  reverse(7);  
  if(input(7)== 0)
    temp = 1;
    return temp;
}

hope it helps
dan

jazzed

The preferred way to read the touch buttons is with getButtons() in the SimpleIDE workspace folder file:

~Documents\SimpleIDE\Propeller GCC Demos\QuickStart\Whack-a-mole\qswam.c

/*
 * Get all buttons at once
 * Run this function from HUB if compiled for LMM.
 */
int getButtons()
{
    int n = 16;
    int result  = -1;
    int reading =  0;
    int pins = 0xFF;
    OUTA |= pins;               //output high to buttons


    while(n--)
    {
        DIRA |= pins;           //output high to buttons
        DIRA ^= pins;           //switch to input
        reading = pins;
        msleep(2);              //wait for RC time pause(2) using simpletools.h
        reading &= INA;          //return button states
        result  &= reading;
    }
    result = ~result & 0xFF;
    return result;
}

Still, "finger licking good" works best.

Sawmiller

Hey those look like spin!
Great, didn't know I could use those.
I do need a reference manual on all these commands
Dan

Sawmiller

ok on my first code up there " robo lights" if you insert a pause(10); in the testbuttons() function right after reverse(7);
it will work with a ordinary finger. i guess the time lets the voltage die off a little.
anyways, fun playing with .
dan

NWCCTV

have to dampen my finger thou

Works without doing this for me. If I dampen my finger the LED seems to stay on.