internal temperatur sensor calibration value with TZEN

[martinhaefner9]

Hello together,

i have an application running with TZEN, unfortunately the readings of the internal temperature sensor calibration values are always zero.

Is there a secure address where the values are stored ?

Or any chance to get the values out in TZEN mode ?

As @Jocelyn RICARD knows i had to enable the trust zone to do the embeddeed provisioning

Kind regards

Martin 

[Jocelyn RICARD]

Hello @martinhaefner9 ,

this issue should not be related to TrustZone.

The access to system memory where calibration values is located is constrained.

You need to either disable ICache or add a MPU region to disable the cache only on this area.

You can find this in example: 

STM32Cube_FW_H5_V1.5.0\Projects\NUCLEO-H563ZI\Examples_LL\UTILS\UTILS_ReadDeviceInfo\

I made the test on non secure side of a TrustZone project

Here is the simple MPU configuration I added:

void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct = {0};
  MPU_Attributes_InitTypeDef MPU_AttributesInit = {0};

  /* Disables the MPU */
  HAL_MPU_Disable();

  /** Initializes and configures the Region 0 and the memory to be protected
  */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.BaseAddress = 0x08FFF000;
  MPU_InitStruct.LimitAddress = 0x08FFFFFFU;
  MPU_InitStruct.AttributesIndex = MPU_ATTRIBUTES_NUMBER0;
  MPU_InitStruct.AccessPermission = MPU_REGION_ALL_RO;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /** Initializes and configures the Attribute 0 and the memory to be protected
  */
  MPU_AttributesInit.Number = MPU_ATTRIBUTES_NUMBER0;
  MPU_AttributesInit.Attributes = INNER_OUTER(MPU_NOT_CACHEABLE);

  HAL_MPU_ConfigMemoryAttributes(&MPU_AttributesInit);
  /* Enables the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);

}

Best regards

Jocelyn