8-bit Microcontrollers中的主题 MC9S08QG8 and strange reset while debugging

MC9S08QG8 and strange reset while debugging

neocronos — Thu, 29 Oct 2020 09:27:13 GMT

Hello,

I've been getting a strange reset. Here is when it happens:

From the main I'm calling ejectarea():

Code:

void ejectarea(void){ byte categ;  byte tarea;    categ = concatenar(msgTipRcv[0], msgTipRcv[1]);  tarea = concatenar(msgRecRcv[0], msgRecRcv[1]);...

The program does the first concatenar() but the reset ocurrs in the second.

concatenar() has:

Code:

byte concatenar(char char1, char char2){ byte num12;  char char12[2] = "";     char12[0] = char1;  strcat(&char12, &char2);  num12 = atoi(&char12);

...

The reset ocurrs inside strcat() (of string.c) at this part of the code:

Code:

LIBDEF_StringPtr strcat(LIBDEF_StringPtr str_d, LIBDEF_ConstStringPtr str_s) {  LIBDEF_StringPtr sd = str_d;  str_d += strlen(str_d);  while(*str_d++ = *str_s++) {}  return (sd);}

Screenshot before the reset.

Screenshot after the reset.

It says: "Error: Unable to go into background mode."

Not sure if it is due to the debugger or what but the hardware is not working well and the only way to check for errors is debuggin the code.

Any ideas?

Thanks a lot

Re: MC9S08QG8 and strange reset while debugging

CompilerGuru — Thu, 29 Oct 2020 09:27:14 GMT

The usage of the ANSI function strcat is incorrect. The strcat function expects as second parameter a pointer to
a zero terminated string, and here a pointer to a single char is passed instead.
Actually just noted that the first argument is incorrect too , the result is probably a 3 byte string (2 char's and a 0 byte), but the dest buffer is only 2 bytes.
So should probably be:

Code:

byte concatenar(char char1, char char2){  char char12[3];  char12[0] = char1;  char12[1] = char2;  char12[2] = 0;

Using atoi should work, although I would not actually use it due to its lack of
error reporting.

Daniel

Re: MC9S08QG8 and strange reset while debugging

JimDon — Mon, 04 Aug 2008 09:10:26 GMT

It would also appear from your before shot that neither char1 or char2 are numbers.

Any time you end with a reset or otherwise in the weeds, think stack crash and look for bad pointer use.

Re: MC9S08QG8 and strange reset while debugging

neocronos — Mon, 04 Aug 2008 10:43:09 GMT

Thanks.

Why did I use strcat() in first place? ...