CRYP issue when Timer is used as Timebase Source

[MattCZ]

Hi, I have nucleo-h753ZI and I want to use CRYP in a project that also uses FREERTOS. I set Timer 6 as Timebase Source (recommended due to FREERTOS) and as a result, program goes to HardFault every time I use HAL_CRYP_Encrypt function.

HAL_CRYP_Decrypt(&hcryp, (uint32_t *)AES_input, 48, (uint32_t *)encrypted, 100);

I configured CRYP to AES CBC with 256bit key and 8bit data and my array size is 48.

When I change Timebase Source to systick, it works without any issues.

Does anyone know what is the issue here?

Thanks.

[CMYL]

Hello MattCZ,

I will check to reproduce the issue once I got the board, could you give me more details about your settings.

• Is it the default one generated by the CubeMx?
• What is the version of CMSIS FreeRTOS APIs, V1 or V2 ?
• MPU disabled or enabled ?
• How many tasks ? One task calling HAL_CRYP_Decrypt(&hcryp, (uint32_t *)AES_input, 48, (uint32_t *)encrypted, 100); ?
• What is the Tick period used ?

Best Regards,

Younes

[CMYL]

Hi,

Attached a main.c file running STM32H7B3I-DK as the nucleo-h753ZI is not available for me. It is easy to migrate it to nucleo-h753ZI.

The freeRTOS project contains 2 Tasks, one for encrypt and the second for Decrypt. The default settings of FreeRTOS are used.

 

To reuse the project, you can generate a new one for nucleo-h753ZI by CubeMx enabling the TIM6 as source of Tick. Then use this main.c file instead of the generated one.

Best Regards,

Younes

[MattCZ]

Hi Younes,

thank you for your reply. I found out that there is some relation to data width you use for crypto. When I was trying 8bit data, it was not working. When I switched to 32bit, it is working fine with Timer 6 as timebase source. I have no idea why.

My original test was with default Cube MX project for H753ZI, no MPU, CMSIS V2, 1 task in freertos and 1msec period.

I was able to continue with 32 bit data, so it is not stop condition. Since you used 16bit, maybe the problem is only with 8bit data width.

Martin

[CMYL]

Hi Martin,

I will check also the 8bits data size 🙂

Younes