Problem with CRC module on touchgfx in stm32h7 ?

[Agran.1]

Hello, I'm working with the STM32H7B3I-DK.

Info:

1- STM32H7B3I-DK (STM32H7B3LIH6QU)

2-STM32CUBEIDE rev: 1.6.1

3- TouchGfx rev: 4.16.1

I want to use the CRC module for data verification (16 bit).

Problem:

when I use the CRC default version everything works fine

 hcrc.Instance = CRC;

 hcrc.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;

 hcrc.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE;

 hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;

 hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;

 hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;

 if (HAL_CRC_Init(&hcrc) != HAL_OK)

 {

   Error_Handler();

 }

But when I use this version of CRC to calculate my crc on my data, there is a problem with touchgfx (touchgfx_init)

 hcrc.Init.DefaultPolynomialUse   = DEFAULT_POLYNOMIAL_DISABLE;

 hcrc.Init.GeneratingPolynomial   = CRC_POLYNOMIAL_VALUE;

 hcrc.Init.CRCLength              = CRC_POLYLENGTH_16B;

 hcrc.Init.DefaultInitValueUse    = DEFAULT_INIT_VALUE_ENABLE;

 hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;

 hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;

 hcrc.InputDataFormat             = CRC_INPUTDATA_FORMAT_BYTES;

 if (HAL_CRC_Init(&hcrc) != HAL_OK)

 {

   Error_Handler();

 }

Error :

in touchgfx_init function

   FrontendHeap::getInstance()

   touchgfx::Screen::draw()

   "<signal handler called>() at 0xffffffe9"

   HardFault_Handler

I do not understand why.

Is there a problem with touchgfx and CRC module?

Thanks in advanced to all your replies

[Tesla DeLorean]

It is used to authenticate STM32 hardware. You should reset the CRC peripheral at a bus level​ once you are done with it.

[Agran.1]

thank you for the answer

This authentication is done only at startup ?

This means that I have to reset the CRC peripheral each time I use it.

[Tesla DeLorean]

I'd hope its a once and done thing at initialization, but this isn't my circus...

You could perhaps test the hypothesis, or turn the clock off occasionally and see if it is used again.

[ADal .2]

Hi,

I have the exact problem: with default CRC poly all is ok, but if I try to change the poly, the execution go in hard fault after MX_TouchGFX_Init().

Is there a solution?

[Tesla DeLorean]

>>Is there a solution?

Patch the libraries/object...

[ADal .2]

I think I have resolve the problem: I leave the default poly and, after all initializations, I re-init the CRC peripheral. Now it work

[JLojo]

+1

Same for me!

Jyl