CODE analysis

usbdmjm60 — Tue, 30 Aug 2011 12:06:43 GMT

HI ... i have tryed to analysed code of usbdm V4.6 for jm60 but i am not able to understand some of them please help me in this the codes sentance which i have not understood are #pragma DATA_SEG DEFAULT

#if (DEBUG&RESET_DEBUG)---------------------------------------------------------not understood
   DEBUG_PIN   = 1;
   DEBUG_PIN   = 0;
#endif---------------------------------------------------------not understood

   if (RESET_IN==0)      // RESET failed to rise
      return(BDM_RC_RESET_TIMEOUT_RISE);

   CLEAR_RESET_SENSE_FLAG(); // Clear RESET IC Event
   ENABLE_RESET_SENSE_INT(); // Enable RESET IC interrupts

   return(BDM_RC_OK);
}

#endif //(HW_CAPABILITY&CAP_RST_IO)---------------------------------------------------------not understood

#if (DEBUG&SYNC_DEBUG))---------------------------------------------------------not understood
DEBUG_PIN = 1;
DEBUG_PIN = 0;
#end)---------------------------------------------------------not understood

#pragma MESSAGE DEFAULT C4003

Re: CODE analysis

pgo — Wed, 31 Aug 2011 09:58:51 GMT

Hi,

Some description:

#if (DEBUG&RESET_DEBUG)-

There is a #defined constant DEBUG which is used to control various debug features in the code. It is a bit vector with each bit representing a different debug feature. These are used to control condition code generation and would usually be disabled in the release version (by setting DEBUG to 0)

HW_CAPABILITY&CAP_RST_IO

The same code is used to build for various versions of the hardware. These have different features which are controlled by

HW_CAPABILITY bit vector in a similar fashion to above.

If you are having trouble understanding #if in general you would be advised to have a look at almost any C programming book for a discussion of preprocessing macros etc.

#pragma DATA_SEG ....

This controls in which segment data are allocated. This is specific to the Codewarrior C compiler. More information can be found in the Codewarrior help files. The USBDM uses it mostly to control BOOT area code & data along with making sure some critical data is allocated in the near segment for fast access.

bye

topic CODE analysis in OSBDM and TBDML

CODE analysis

Re: CODE analysis