コード例 #1
0
/**
 * @brief MPU region configuration function
 */
void MPU_Config(void)
{
  MPU_Disable();

  /* Configure FLASH region as REGION N0, 1MB of size and R/W region */
  MPU_Region_Config(0,FLASH_ADDRESS_START,FLASH_SIZE,MPU_REGION_PRIVILEGED_READ_WRITE);

  /* Configure RAM region as Region N1, 128kB of size and R/W region */
  MPU_Region_Config(1,RAM1_ADDRESS_START,RAM1_SIZE,MPU_REGION_PRIVILEGED_READ_WRITE);

  /* Configure small RAM region as REGION N2, 32Byte of size, no access region and Execute Never region */
  MPU_Region_Config(2,RAM2_ADDRESS_START,RAM2_SIZE,MPU_NO_ACCESS);

  /* Configure Peripheral region as REGION N3, 128KB of size, R/W region */
  MPU_Region_Config(3,PERIPH_ADDRESS_START,PERIPH_SIZE,MPU_REGION_PRIVILEGED_READ_WRITE);


  /* Enable the memory fault exception */
  SCB->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk;

  /* Enable MPU */
  MPU_Enable();
}
コード例 #2
0
ファイル: mpu.c プロジェクト: EnergyMicro/EFM32_Gxxx_STK
/**************************************************************************//**
 * @brief  Main function.
 *****************************************************************************/
int main( void )
{
  int i;
  MPU_RegionInit_TypeDef flashInit       = MPU_INIT_FLASH_DEFAULT;
  MPU_RegionInit_TypeDef sramInit        = MPU_INIT_SRAM_DEFAULT;
  MPU_RegionInit_TypeDef peripheralInit  = MPU_INIT_PERIPHERAL_DEFAULT;

  /* Chip alignment */
  CHIP_Init();

  /* If first word of user data page is non-zero, enable eA Profiler trace */
  BSP_TraceProfilerSetup();

  /* Enable LCD without voltage boost */
  SegmentLCD_Init( false );
  SegmentLCD_AllOff();
  SegmentLCD_Symbol(LCD_SYMBOL_GECKO, 1);
  SegmentLCD_Symbol(LCD_SYMBOL_EFM32, 1);

  GpioInit();

  RTCDRV_Setup( cmuSelect_LFXO, cmuClkDiv_32);

  ScrollText( "        MPU DEMO  PRESS Pb0 OR Pb1 "
              "TO GENERATE MPU EXCEPTIONS         " );

  MPU_Disable();

  /* Flash memory */
  MPU_ConfigureRegion( &flashInit );

  /* SRAM */
  MPU_ConfigureRegion( &sramInit );

  /* SRAM, a 4k part with priviledged only access, this regions settings  */
  /* will override those of the previous region                           */
  sramInit.regionNo         = 2;
  sramInit.baseAddress      = RAM_MEM_BASE + 0x2000;
  sramInit.size             = mpuRegionSize4Kb;
  sramInit.accessPermission = mpuRegionApPRw;
  MPU_ConfigureRegion( &sramInit );

  /* LCD, priviledged only access */
  peripheralInit.regionNo         = 3;
  peripheralInit.baseAddress      = LCD_BASE;
  peripheralInit.size             = mpuRegionSize128b;
  peripheralInit.accessPermission = mpuRegionApPRw;
  MPU_ConfigureRegion( &peripheralInit );

  MPU_Enable( MPU_CTRL_PRIVDEFENA ); /* Full access to default memory map */
                                     /* in priviledged state              */

  i = 0;
  while ( 1 )
  {
    SegmentLCD_Number( i );          /* Count on numeric diplay */
    i = ( i + 1 ) % 101;
    RTCDRV_Delay( 150 , false);

    if ( PB0_PUSHED() )
    {
      BullsEye( 1 );

      /* Generate an access violation in internal SRAM          */
      __set_CONTROL( 1 );   /* Enter User (unpriviledged) state */
      *(volatile uint32_t *)(RAM_MEM_BASE + 0x2000) = 1;

      BullsEye( 0 );
    }

    if ( PB1_PUSHED() )
    {
      BullsEye( 1 );

      /* Generate an access violation in LCD peripheral         */
      __set_CONTROL( 1 );   /* Enter User (unpriviledged) state */

      BullsEye( 0 );
    }
  }
}
コード例 #3
0
ファイル: mpu.c プロジェクト: SiliconLabs/Gecko_SDK
/**************************************************************************//**
 * @brief  Main function
 *****************************************************************************/
int main(void)
{
  int c;
  MPU_RegionInit_TypeDef flashInit       = MPU_INIT_FLASH_DEFAULT;
  MPU_RegionInit_TypeDef sramInit        = MPU_INIT_SRAM_DEFAULT;
  MPU_RegionInit_TypeDef peripheralInit  = MPU_INIT_PERIPHERAL_DEFAULT;

  /* Chip revision alignment and errata fixes */
  CHIP_Init();

  /* Initialize DK board register access */
  BSP_Init(BSP_INIT_DK_SPI);

  /* If first word of user data page is non-zero, enable eA Profiler trace */
  BSP_TraceProfilerSetup();

  /* Enable printf on RS232 port - this example only supports LEUART */
  RETARGET_SerialInit();
  RETARGET_SerialCrLf(1);

  printf("\nEFM32 MPU access violation example.\n"
           "Hit lowercase 'x' to force access violations.\n");

  MPU_Disable();

  /* Flash memory */
  MPU_ConfigureRegion( &flashInit );

  /* SRAM */
  MPU_ConfigureRegion( &sramInit );

  /* SRAM, a 4k part with priviledged only access, this regions settings  */
  /* will override those of the previous region                           */
  sramInit.regionNo         = 2;
  sramInit.baseAddress      = RAM_MEM_BASE + 0x2000;
  sramInit.size             = mpuRegionSize4Kb;
  sramInit.accessPermission = mpuRegionApPRw;
  MPU_ConfigureRegion( &sramInit );

  /* LEUART, priviledged only access */
  peripheralInit.regionNo         = 3;
  peripheralInit.baseAddress      = LEUART1_BASE;
  peripheralInit.size             = mpuRegionSize128b;
  peripheralInit.accessPermission = mpuRegionApPRw;
  MPU_ConfigureRegion( &peripheralInit );

  MPU_Enable( MPU_CTRL_PRIVDEFENA ); /* Full access to default memory map */
                                     /* in priviledged state              */

  while (1)
  {
    EMU_EnterEM2(true);

    /* Retrieve new character */
    c = getchar();
    if (c > 0)
    {
      if ( c == 'x' )
      {
        /* Generate an access violation in LEUART1 peripheral     */
        __set_CONTROL( 1 );   /* Enter User (unpriviledged) state */
        putchar( c );

        /* MemManage_Handler() will set back to priviledged state */

        /* Generate an access violation in internal SRAM          */
        __set_CONTROL( 1 );   /* Enter User (unpriviledged) state */
        *(volatile uint32_t *)(RAM_MEM_BASE + 0x2000) = 1;

        /* MemManage_Handler() will set back to priviledged state */
      }
    else
      {
      /* Echo character */
      putchar(c);
      }
    }

    /* Most terminals issue CR when pressing enter, add LF */
    if (c == '\r')
    {
      putchar('\n');
    }
  }
}