CMSIS: DSP Lib - Frequency Bin Example (strange behavior)

Estimated colleagues,

following I explain the strange behavior:

• I am working the STM32F407 ARM processor,
• compiling with the GNU Tools ARM (4_9-2014q4) ,
• use the HAL provided by STM32CubeF4 v1.5.0,
• using the DSPLib provided CMSIS Version 1.4.4 2014/07/31 ,
• UPDATE 2015-05-22:
  • I also tried this with the last MDK-ARM version (uVIsion V5.14.0.0) and ITS CMSIS / DSP_Lib examples and found the same effect!!

During testing my board with the "Frequency Bin Example" provided with the DSP Lib I found following effects:

A) The example test program provided by CMSIS works fine. That is testIndex equals to refIndex (which is 213) and goes to infinite loop.

B) But when I modify the program e.g. with a while() in order to execute cyclically like this

...global and extern variables...

void main(void)

{

  arm_status status;

  float32_t maxValue;

     while(1)

   {

       status = ARM_MATH_SUCCESS;

       /* Process the data through the CFFT/CIFFT module */

       arm_cfft_f32(&arm_cfft_sR_f32_len1024, testInput_f32_10khz, ifftFlag, doBitReverse);

       /* Process the data through the Complex Magnitude Module for

       calculating the magnitude at each bin */

       arm_cmplx_mag_f32(testInput_f32_10khz, testOutput, fftSize);

       /* Calculates maxValue and returns corresponding BIN value */

       arm_max_f32(testOutput, fftSize, &maxValue, &testIndex);

        if(testIndex !=  refIndex)

      {

         status = ARM_MATH_TEST_FAILURE;

       }

     }

}

the program throws ARM_MATH_TEST_FAILURE the second time.

C) If I define testInput_f32_10khz[] as a constant array on the flash then the program throws ARM_MATH_TEST_FAILURE always.

• The problem does not have to do with the bit reversal problem of old versions (so much as I could see from other discussions).
• I am using the sources not the library (because only the ARM library is provided with STMCube.

Hopefully someone can help me or give me some tip.

Thank you in advance!.