Hello,
I am using an HCS08 MC9S08QG8 and I am having some issues that appear to be timing issues.
I have written the following code: it is just designed to wait for the push of an external switch (attached to PTAD3), and then toggle an LED and increment a counter.
It works fine when I single step through the code, but when I just run it normally, the counter does not increment (when I am watching it in the true time simulator), although the LED toggles off and on. I set breakpoints inside the endless loop but I never hit them. Also, I get a message “Frequency change to ~xxxxxxx”.
Do I need to initialize the clock frequency somehow? Can you let me know what’s wrong with my timing?
Thanks,
Tim
#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */
#include <MC9S08QG8.h>
int counter1=0;
int x=0;
void main(void) {
// Set Port A Pin 3 (external Pin 11, connected to pushbutton SW) to input
PTADD_PTADD3 = 0;
// Set Port B Pin 6 (connected to LED1) to output
PTBDD_PTBDD6 = 1;
for(;
{
// Spin until a high signal is detected
while (PTAD_PTAD3 == 0){};
// Then increment counter...
counter1 = counter1 + 1;
// And toggle LED1
if (PTBD_PTBD6 == 1){
PTBD_PTBD6 = 0;
}
else {
PTBD_PTBD6 = 1;
}
// Spin until while signal is high
while (PTAD_PTAD3 == 1){};
}
}
