/**
* @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();
}
/**************************************************************************//**
* @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 );
}
}
}
/**************************************************************************//**
* @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');
}
}
}
