S12 / MagniV MicrocontrollersのトピックRe: MC9S12NE64 timers

MC9S12NE64 timers

Mampaey — Mon, 22 Feb 2010 00:12:56 GMT

Hi everyone,

I have many problems with timers.

could someone tell me what I have to do to have a timer wich reset and works forever, with interrupts.

Thanks.

Re: MC9S12NE64 timers

isionous — Mon, 22 Feb 2010 00:16:59 GMT

You should probably post your code in order for us to help you. Also, you might want to look at http://users.ece.utexas.edu/~valvano/Starterfiles/ which has plenty of starter code for timers if you search for "output compare" on the page.

Re: MC9S12NE64 timers

Mampaey — Thu, 29 Oct 2020 09:27:05 GMT

#include <MC9S12NE64.h>     /* derivative information */#include "lib.h"#include "Cpu.h"static long absoluteTime = 0;static long absoluteTimeUp = 0;static long msDelai = 0;static int b=1;static void startTimeBase(void){  absoluteTime = 0;  msDelai=500;  absoluteTimeUp=absoluteTime+msDelai;  }volatile unsigned int count;#pragma CODE_SEG NON_BANKEDinterrupt void _Vtimovf (void) { int i =0; absoluteTime++;                  //i=setPortPinValue('g', 0, ON); TFLG2 = 0x80;// clear the interrupt flag   count++; //increment counter   }   #pragma CODE_SEG DEFAULTvoid main(void) {int i =0;  /* put your own code here */   TSCR1=0X80;//enable timer   TSCR2=0x85;  //select prescler bus clock/32  TFLG2=0x80;// clear timer flag    i=setPortPinDirection('g', 0, OUTPUT);  i=setPortPinDirection('h', 0, INPUT);  PTG_PTG0 =1;  //i=setPortPinValue('g', 0, OFF);  startTimeBase();  EnableInterrupts;   while(1)   {    while(absoluteTimeUp>absoluteTime)    {   }         absoluteTime=0;      if(b==0)       {        b=1;                i=setPortPinValue('g', 0, OFF);      }      else       {        b=0;                i=setPortPinValue('g', 0, ON);      }               } /* wait forever */}

here is my code

Re: MC9S12NE64 timers

isionous — Mon, 22 Feb 2010 15:48:55 GMT

What do you want the code to do and what does the code actually do?

One suggestion so far, make your global variables volatile since they are being used by more than one thread.

Re: MC9S12NE64 timers

Mampaey — Mon, 22 Feb 2010 17:05:45 GMT

This code should make a LED twinkle.

In fact, the LED isn't.

Thanks.

Re: MC9S12NE64 timers

kef — Mon, 22 Feb 2010 18:12:57 GMT

Why then i=setPortPinValue('g', 0, ON); line is commented out?

Did you initialize interrupt vectors table properly? Is there some dedicated *.c module with interrupts table defined? Maybe set interrupt vectors in *.prm file? If not then you should change timer overflow ISR like this:

interrupt VectorNumber_Vtimovf void _Vtimovf (void)

{

...

}