STM32H7 MPU Configuration

mpu.c

/**
  * @brief  Configure the MPU attributes as Write Through for External SDRAM.
  * @note   The Base Address is 0xD0000000 .
  *         The Configured Region Size is 32MB because same as SDRAM size.
  * @param  None
  * @retval None
  */
void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct;

  /* Disable the MPU */
  HAL_MPU_Disable();

#if 1
  /* Configure SDRAM as Write through, no write allocate (WT-NWA) */
  MPU_InitStruct.Enable           = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress      = 0xD0000000;
  MPU_InitStruct.Size             = MPU_REGION_SIZE_32MB;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.IsBufferable     = MPU_ACCESS_NOT_BUFFERABLE;
  MPU_InitStruct.IsCacheable      = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsShareable      = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.Number           = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField     = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x00;
  MPU_InitStruct.DisableExec      = MPU_INSTRUCTION_ACCESS_ENABLE;
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
#elif 0
  /* Configure SDRAM as Write-back, no write allocate (WB-NWA) */
  MPU_InitStruct.Enable           = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress      = 0xD0000000;
  MPU_InitStruct.Size             = MPU_REGION_SIZE_32MB;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.IsBufferable     = MPU_ACCESS_BUFFERABLE;
  MPU_InitStruct.IsCacheable      = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsShareable      = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.Number           = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField     = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x00;
  MPU_InitStruct.DisableExec      = MPU_INSTRUCTION_ACCESS_ENABLE;
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
#else
  /* Configure SDRAM as Write-back, read and write allocate (WB-RWA) */
  MPU_InitStruct.Enable           = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress      = 0xD0000000;
  MPU_InitStruct.Size             = MPU_REGION_SIZE_32MB;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.IsBufferable     = MPU_ACCESS_BUFFERABLE;
  MPU_InitStruct.IsCacheable      = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsShareable      = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.Number           = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField     = MPU_TEX_LEVEL1;
  MPU_InitStruct.SubRegionDisable = 0x00;
  MPU_InitStruct.DisableExec      = MPU_INSTRUCTION_ACCESS_ENABLE;
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
#endif

  /* Enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}