MC9S08DN16

vikassubramani — Wed, 11 Jun 2014 18:10:44 GMT

Hi every body i am a new bie to MC9S08DN16 controller and i am facing problem in toggling the port the code is as below.

/* [sample program to toggle the port D of the micro controller ] */

#include <hidef.h> /* for EnableInterrupts macro */

#include "derivative.h" /* include peripheral declarations */

void port_initialize(void);

void delay(void);

void main(void)

{

EnableInterrupts;

/* include your code here */

port_initialize();

while(1)

{

PTED = 0x00; /* flashing 0's on to port D */

delay(); /* delay function */

PTED = 0xff; /* flashing 1's on to port D */

delay(); /* delay function */

}

/* loop forever */

/* please make sure that you never leave main */

}

void port_initialize(void )

{

PTEDD = 0xff; /* port D data direction register configured as output */

PTEPE = 0x00; /* Internal pull-up/pull-down device disabled for port D */

PTESE = 0x00; /* Output slew rate control disabled for port D */

// PTEPE = 0x00; /* Port disabled as interrupt */

}

void delay()

{

unsigned int i,j;

for(i=0; i<255; i++)

for(j=0; j<255;j++);

}

The problem i am facing is that although the code is in infinate loop. when i run the program after few seconds the code will exit unexpectedly and will lead to a new window and displays the following.

#pragma NO_EXIT

__EXTERN_C void _Startup(void) {

/* set the reset vector to _Startup in the linker parameter file (*.prm):

'VECTOR 0 _Startup'

purpose: 1) initialize the stack

2) initialize run-time, ...

initialize the RAM, copy down init data, etc (Init)

3) call main;

called from: _PRESTART-code generated by the Linker

INIT_SP_FROM_STARTUP_DESC(); /*lint !e960 MISRA 14.3 REQ, not a null statement (instead: several HLI statements) */

#ifndef __ONLY_INIT_SP

Init(); /*lint !e522 function 'Init' contains inline assembly */

#endif

#ifndef __BANKED__

__asm JMP main; /* with a C style main(); we would push the return address on the stack wasting 2 RAM bytes */

#else

__asm CALL main;

#endif

}

Re: MC9S08DN16

ZhangJennie — Thu, 12 Jun 2014 02:05:46 GMT

hi Vikas,

from your description, your program got reset when running in loop.

I wonder the reset was caused by COP. please try to add feed dog code inside for() loop:

for example:;

for(;;) {

... ...

__RESET_WATCHDOG(); /* feeds the dog */

... ...

} /* loop forever */

this can avoid watchdog reset.

=====================================================

this answer is for you. if it helps, please click on "correct answer " button. thanks!

Best Regards,

Jennie

Re: MC9S08DN16

vikassubramani — Thu, 12 Jun 2014 15:53:51 GMT

thanks zhang jennie the problem was solved

Re: MC9S08DN16

ZhangJennie — Fri, 13 Jun 2014 03:16:17 GMT

you are welcome.

Best Regards,

Jennie

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