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sprintf causing a hardfault exception

Dan Curran

Had to add some data logging in a hurry to diagnose an issue.

A function is passed a pointer to data that is then used to assemble a readable string that's then stored on a SD card

the RTOS task that does this has a 8K stack and typically runs at 10% loading up to 80%
(Crude observations of the debug options window)

The first version of the code version cause a Hardfault exception at the sprintf
instruction.

I do not use the micro Lib and have included retarget.c in the project

unit8_t baBuf[100];
/*******************************
*       Create the Data
********************************/
sprintf((char *)&baBuf[0],"%08d,%08d,%02d,%02d,%02d,%02d,%02d,%02d,%04d,%04d\r\n",
     psLIN->lMillsecTimePerDay,
     psLIN->lDataId,
      psLIN->bData1,psLIN->bData2,psLIN->bData3,psLIN->bData4,
        psLIN->bData5,psLIN->bData6,psLIN->wData1,psLIN->wData2);

The second version of the code works as expected

unit8_t baBuf[100];
/*******************************
*       Create the Data
********************************/
sprintf((char *)&baBuf[0],"%08d,",psLIN->lMillsecTimePerDay);
wDataLength = strlen((const char *)&baBuf[0]);

sprintf((char *)&baBuf[wDataLength],"%08d,%02d,%02d,%02d,%02d,%02d,%02d,%04d,%04d\r\n",
     psLIN->lDataId,
      psLIN->bData1,psLIN->bData2,psLIN->bData3,psLIN->bData4,
        psLIN->bData5,psLIN->bData6,psLIN->wData1,psLIN->wData2);

Any one have an view on why the first version of the code should be failing ?
or is it a case of Please read the manual

thanks Dan

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