μVISION DEBUGGER: HOW CAN I LOG VARIABLE VALUES TO A FILE

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Information in this article applies to:

• μVision Version 2 and Later

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QUESTION

I run my microcontroller application in the μVisionsimulator andon the target debugger. This application fills an arraywith data. Is it possible to write the values of this array to a fileon my PC? Every time I modify my application, I want to compare thedata with the previous version.

ANSWER

Yes, this is possible. Let's assume that the application definesan array like this:

unsigned char testarray[100];

Depending on the format you need, there are many ways to log thesevalues to a file:

• Use the μVision save command to save the data in a hex file:

  save MyValues.hex &testarray[0], &testarray[99]

  The file MyValues.hex then contains the values and the address information. Although viewing the values in this file may not be easy, this hex file may be loaded back into μVision to restore the values.

• You can display the values in the command window and log them to a file:

  log > MyValues.logd &testarray[0], &testarray[99]0x00C240: 00 01 02 03 04 05 06 07 - 08 09 0A 0B 0C 0D 0E 0F ................0x00C250: 10 11 12 13 14 15 16 17 - 18 19 1A 1B 1C 1D 1E 1F ................0x00C260: 20 21 22 23 24 25 26 27 - 28 29 2A 2B 2C 2D 2E 2F  !"#$%&'()*+,-./0x00C270: 30 31 32 33 34 35 36 37 - 38 39 3A 3B 3C 3D 3E 3F 0123456789:;<=>?0x00C280: 40 41 42 43 44 45 46 47 - 48 49 4A 4B 4C 4D 4E 4F @ABCDEFGHIJKLMNO0x00C290: 50 51 52 53 54 55 56 57 - 58 59 5A 5B 5C 5D 5E 5F PQRSTUVWXYZ[\]^_0x00C2A0: 60 61 62 63                                       'abclog off

  You will see the same text output in the file that wasspecified with the μVision LOG command (MyValues.log in thisexample).
• You can log the values in any other format to a file by using user defined functions in the simulator or target debugger. The function can be invoked from the μVision command line or from a button in the toolbox.

  Define a user defined function in the μVision function editor.

  FUNC void displayvalues(void) {  int idx;  exec("log > MyValues.log");  for (idx = 0; idx < 100; idx++) {    printf ("testarray[idx] = %02X\n", idx, testarray[idx]);  }  exec("log off");}

  When the simulator is stopped, the function can be invoked in the μVision command line

  displayvalues()   // function invocation

  or you can define a button in the toolbox to start the function

  define button "Log Array", "displayvalues()"

  The values can be viewed in the command window and they are logged to the specified file:

  testarray[idx] = 00testarray[idx] = 01testarray[idx] = 02testarray[idx] = 03testarray[idx] = 04testarray[idx] = 05testarray[idx] = 06testarray[idx] = 07testarray[idx] = 08testarray[idx] = 09:testarray[idx] = 60testarray[idx] = 61testarray[idx] = 62testarray[idx] = 63

SEE ALSO

• μVision DEBUGGER: LOGGING MEMORY CONTENTS TO A FILE

FORUM THREADS

The following Discussion Forum threads mayprovide information related to this topic.

• File IO
• uVision Debugger - how to export watch variable