8-bit MicrocontrollersのトピックRe: Passed Variables Getting scrambled Take Two

Passed Variables Getting scrambled Take Two

mjcoury — Sat, 26 May 2007 01:41:03 GMT

I'm still looking for some ideas for this problem...

I enter a routine with passed variables....

Code:

int iTVI_LCDPing(char cBouy){    iTVI_AddQueue(TVI_CLEAR   , TVI_CLEAR_ALL, TVI_DELAY);  iTVI_AddQueue(TVI_FONT_SEL, TVI_FONT_MED , TVI_DELAY);    iTVI_AddQueue(TVI_COLUMN_START, 0x01         , TVI_DELAY);  iTVI_AddQueue(TVI_PAGE_START  , 0x01         , TVI_DELAY);  iTVI_TransmitStr("Watch the display and press '#' to ping the ");  switch(cMyStupidGlobal)  {    case SCI_A:      iTVI_TransmitStr("Pin");    break;    case SCI_B:      iTVI_TransmitStr("Boat");    break;  }  iTVI_TransmitStr(" Bouy");    return ERROR_NONE;}

after the 5 routines, CBouy is lost and gone forever and the switch command is performend on random data.... any ideas where to start looking?

Re: Passed Variables Getting scrambled Take Two

mjcoury — Sat, 26 May 2007 02:06:55 GMT

Update

I changed the code like this:

Code:

int iTVI_LCDPing(char cBouy){    char cMyTemp = (cBouy & 0xFF);    iTVI_AddQueue(TVI_CLEAR   , TVI_CLEAR_ALL, TVI_DELAY);  iTVI_AddQueue(TVI_FONT_SEL, TVI_FONT_MED , TVI_DELAY);    iTVI_AddQueue(TVI_COLUMN_START, 0x01         , TVI_DELAY);  iTVI_AddQueue(TVI_PAGE_START  , 0x01         , TVI_DELAY);  iTVI_TransmitStr("Watch the display and press '#' to ping the ");  switch(cMyTemp)  {    case SCI_A:      iTVI_TransmitStr("Pin");    break;    case SCI_B:      iTVI_TransmitStr("Boat");    break;  }  iTVI_TransmitStr(" Bouy");    return ERROR_NONE;}

and the problem goes away... according to the Debugging enviroment cMyTemp is never "assigned" and the problem has vanished....

Re: Passed Variables Getting scrambled Take Two

alejmrm — Sat, 26 May 2007 04:47:58 GMT

Per you first implementation, the arg and the switch arg doesn't match... so I guess that the compiler optimaze your function argument, but the switch var must give you an error when compiling due it hasn't been declared... just my 2 cents.

Re: Passed Variables Getting scrambled Take Two

mjcoury — Tue, 29 May 2007 21:39:11 GMT

Sorry - was changed for debugging

int iTVI_LCDPing(char cBouy)
{
 
  iTVI_AddQueue(TVI_CLEAR   , TVI_CLEAR_ALL, TVI_DELAY);
  iTVI_AddQueue(TVI_FONT_SEL, TVI_FONT_MED , TVI_DELAY);
 
  iTVI_AddQueue(TVI_COLUMN_START, 0x01         , TVI_DELAY);
  iTVI_AddQueue(TVI_PAGE_START  , 0x01         , TVI_DELAY);
  iTVI_TransmitStr("Watch the display and press '#' to ping the ");

  switch(cBouy)
  {
    case SCI_A:
      iTVI_TransmitStr("Pin");
    break;
    case SCI_B:
      iTVI_TransmitStr("Boat");
    break;
  }
  iTVI_TransmitStr(" Bouy");
 
  return ERROR_NONE;

}

Re: Passed Variables Getting scrambled Take Two

CrasyCat — Wed, 30 May 2007 17:36:43 GMT

Hello

Do you have a prototype for the function iTVI_LCDPing before it gets called?

Otherwise, you may want to get one of our support engineer looking into that. I would recommend you submit a service request for that.

Click here to submit a service request.

Make sure to attach a project reproducing the issue and installed product information to the SR.
To make sure you provide all necessary project information, you can use the Pack and Go wizard.
- Start the IDE
- Open the Project
- Select Help -> "Pack and Go"
- Follow the instruction on the screen. That will generate a zip file containing all necessary
information (including the installed product information).

CrasyCat

Re: Passed Variables Getting scrambled Take Two

mjcoury — Wed, 30 May 2007 20:05:13 GMT

if you mean by prototype....

i have in

tvi_lcd.h

int iTVI_LCDPing(char cBouy);

like that?

Re: Passed Variables Getting scrambled Take Two

CrasyCat — Thu, 31 May 2007 17:31:41 GMT

Hello

Yep. That is a prototype.

CrasyCat