SMU - Security Management Unit#

Security Management Unit (SMU) Peripheral API.

SMU forms the control and status/reporting component of bus-level security in EFM32/EFR32 devices.

Peripheral-level protection is provided via the Peripheral Protection Unit (PPU). PPU provides hardware access barrier to any peripheral that is configured to be protected. When an attempt is made to access a peripheral without the required privilege/security level, PPU detects the fault and intercepts the access. No write or read of the peripheral register space occurs, and an all-zero value is returned if the access is a read.

Usage example

// SMU is always clocked, so no call to CMU_ClockEnable() is necessary

// Initialize SMU to prevent access to CMU, EMU, SMU and GPIO
SMU_Init_TypeDef init = SMU_INIT_DEFAULT;
init.ppu.access.privilegedCMU = true;
init.ppu.access.privilegedEMU = true;
init.ppu.access.privilegedSMU = true;
init.ppu.access.privilegedGPIO = true;
SMU_Init(&init);

Modules#

SMU_PrivilegedAccess_TypeDef

SMU_Init_TypeDef

Enumerations#

enum

SMU_Peripheral_TypeDef {

smuPeripheralACMP0 = _SMU_PPUPATD0_ACMP0_SHIFT

smuPeripheralACMP1 = _SMU_PPUPATD0_ACMP1_SHIFT

smuPeripheralACMP2 = _SMU_PPUPATD0_ACMP2_SHIFT

smuPeripheralADC0 = _SMU_PPUPATD0_ADC0_SHIFT

smuPeripheralADC1 = _SMU_PPUPATD0_ADC1_SHIFT

smuPeripheralCAN0 = _SMU_PPUPATD0_CAN0_SHIFT

smuPeripheralCAN1 = _SMU_PPUPATD0_CAN1_SHIFT

smuPeripheralCMU = _SMU_PPUPATD0_CMU_SHIFT

smuPeripheralCRYOTIMER = _SMU_PPUPATD0_CRYOTIMER_SHIFT

smuPeripheralCRYPTO0 = _SMU_PPUPATD0_CRYPTO0_SHIFT

smuPeripheralCSEN = _SMU_PPUPATD0_CSEN_SHIFT

smuPeripheralVDAC0 = _SMU_PPUPATD0_VDAC0_SHIFT

smuPeripheralPRS = _SMU_PPUPATD0_PRS_SHIFT

smuPeripheralEBI = _SMU_PPUPATD0_EBI_SHIFT

smuPeripheralEMU = _SMU_PPUPATD0_EMU_SHIFT

smuPeripheralFPUEH = _SMU_PPUPATD0_FPUEH_SHIFT

smuPeripheralGPCRC = _SMU_PPUPATD0_GPCRC_SHIFT

smuPeripheralGPIO = _SMU_PPUPATD0_GPIO_SHIFT

smuPeripheralI2C0 = _SMU_PPUPATD0_I2C0_SHIFT

smuPeripheralI2C1 = _SMU_PPUPATD0_I2C1_SHIFT

smuPeripheralIDAC0 = _SMU_PPUPATD0_IDAC0_SHIFT

smuPeripheralMSC = _SMU_PPUPATD0_MSC_SHIFT

smuPeripheralLCD = _SMU_PPUPATD0_LCD_SHIFT

smuPeripheralLDMA = _SMU_PPUPATD0_LDMA_SHIFT

smuPeripheralLESENSE = _SMU_PPUPATD0_LESENSE_SHIFT

smuPeripheralLETIMER0 = _SMU_PPUPATD0_LETIMER0_SHIFT

smuPeripheralLETIMER1 = _SMU_PPUPATD0_LETIMER1_SHIFT

smuPeripheralLEUART0 = _SMU_PPUPATD0_LEUART0_SHIFT

smuPeripheralLEUART1 = _SMU_PPUPATD0_LEUART1_SHIFT

smuPeripheralPCNT0 = 32 + _SMU_PPUPATD1_PCNT0_SHIFT

smuPeripheralPCNT1 = 32 + _SMU_PPUPATD1_PCNT1_SHIFT

smuPeripheralPCNT2 = 32 + _SMU_PPUPATD1_PCNT2_SHIFT

smuPeripheralQSPI0 = 32 + _SMU_PPUPATD1_QSPI0_SHIFT

smuPeripheralRMU = 32 + _SMU_PPUPATD1_RMU_SHIFT

smuPeripheralRTC = 32 + _SMU_PPUPATD1_RTC_SHIFT

smuPeripheralRTCC = 32 + _SMU_PPUPATD1_RTCC_SHIFT

smuPeripheralSDIO = 32 + _SMU_PPUPATD1_SDIO_SHIFT

smuPeripheralSMU = 32 + _SMU_PPUPATD1_SMU_SHIFT

smuPeripheralTIMER0 = 32 + _SMU_PPUPATD1_TIMER0_SHIFT

smuPeripheralTIMER1 = 32 + _SMU_PPUPATD1_TIMER1_SHIFT

smuPeripheralTIMER2 = 32 + _SMU_PPUPATD1_TIMER2_SHIFT

smuPeripheralTIMER3 = 32 + _SMU_PPUPATD1_TIMER3_SHIFT

smuPeripheralTRNG0 = 32 + _SMU_PPUPATD1_TRNG0_SHIFT

smuPeripheralUART0 = 32 + _SMU_PPUPATD1_UART0_SHIFT

smuPeripheralUART1 = 32 + _SMU_PPUPATD1_UART1_SHIFT

smuPeripheralUSART0 = 32 + _SMU_PPUPATD1_USART0_SHIFT

smuPeripheralUSART1 = 32 + _SMU_PPUPATD1_USART1_SHIFT

smuPeripheralUSART2 = 32 + _SMU_PPUPATD1_USART2_SHIFT

smuPeripheralUSART3 = 32 + _SMU_PPUPATD1_USART3_SHIFT

smuPeripheralUSART4 = 32 + _SMU_PPUPATD1_USART4_SHIFT

smuPeripheralUSB = 32 + _SMU_PPUPATD1_USB_SHIFT

smuPeripheralWDOG0 = 32 + _SMU_PPUPATD1_WDOG0_SHIFT

smuPeripheralWDOG1 = 32 + _SMU_PPUPATD1_WDOG1_SHIFT

smuPeripheralWTIMER0 = 32 + _SMU_PPUPATD1_WTIMER0_SHIFT

smuPeripheralWTIMER1 = 32 + _SMU_PPUPATD1_WTIMER1_SHIFT

smuPeripheralEnd

}

SMU peripheral identifiers.

Functions#

void

SMU_EnablePPU(bool enable)

Enable or disable PPU of SMU.

void

SMU_Init(const SMU_Init_TypeDef *init)

Initialize PPU of SMU.

void

SMU_SetPrivilegedAccess(SMU_Peripheral_TypeDef peripheral, bool privileged)

Change access settings for a peripheral.

SMU_Peripheral_TypeDef

SMU_GetFaultingPeripheral(void)

Get the ID of the peripheral that caused an access fault.

void

SMU_IntClear(uint32_t flags)

Clear one or more pending SMU interrupts.

void

SMU_IntDisable(uint32_t flags)

Disable one or more SMU interrupts.

void

SMU_IntEnable(uint32_t flags)

Enable one or more SMU interrupts.

uint32_t

SMU_IntGet(void)

Get pending SMU interrupts.

uint32_t

SMU_IntGetEnabled(void)

Get enabled and pending SMU interrupt flags.

void

SMU_IntSet(uint32_t flags)

Set one or more pending SMU interrupts from SW.

Macros#

#define

SMU_INIT_DEFAULT undefined

Default SMU initialization structure settings.

Enumeration Documentation#

SMU_Peripheral_TypeDef#

SMU_Peripheral_TypeDef

SMU peripheral identifiers.

Enumerator
smuPeripheralACMP0	SMU peripheral identifier for ACMP0.
smuPeripheralACMP1	SMU peripheral identifier for ACMP1.
smuPeripheralACMP2	SMU peripheral identifier for ACMP2.
smuPeripheralADC0	SMU peripheral identifier for ADC0.
smuPeripheralADC1	SMU peripheral identifier for ADC1.
smuPeripheralCAN0	SMU peripheral identifier for CAN0.
smuPeripheralCAN1	SMU peripheral identifier for CAN1.
smuPeripheralCMU	SMU peripheral identifier for CMU.
smuPeripheralCRYOTIMER	SMU peripheral identifier for CRYOTIMER.
smuPeripheralCRYPTO0	SMU peripheral identifier for CRYPTO0.
smuPeripheralCSEN	SMU peripheral identifier for CSEN.
smuPeripheralVDAC0	SMU peripheral identifier for VDAC0.
smuPeripheralPRS	SMU peripheral identifier for PRS.
smuPeripheralEBI	SMU peripheral identifier for EBI.
smuPeripheralEMU	SMU peripheral identifier for EMU.
smuPeripheralFPUEH	SMU peripheral identifier for FPUEH.
smuPeripheralGPCRC	SMU peripheral identifier for GPCRC.
smuPeripheralGPIO	SMU peripheral identifier for GPIO.
smuPeripheralI2C0	SMU peripheral identifier for I2C0.
smuPeripheralI2C1	SMU peripheral identifier for I2C1.
smuPeripheralIDAC0	SMU peripheral identifier for IDAC0.
smuPeripheralMSC	SMU peripheral identifier for MAC.
smuPeripheralLCD	SMU peripheral identifier for LCD.
smuPeripheralLDMA	SMU peripheral identifier for LDMA.
smuPeripheralLESENSE	SMU peripheral identifier for LESENSE.
smuPeripheralLETIMER0	SMU peripheral identifier for LETIMER0.
smuPeripheralLETIMER1	SMU peripheral identifier for LETIMER1.
smuPeripheralLEUART0	SMU peripheral identifier for LEUART0.
smuPeripheralLEUART1	SMU peripheral identifier for LEUART1.
smuPeripheralPCNT0	SMU peripheral identifier for PCNT0.
smuPeripheralPCNT1	SMU peripheral identifier for PCNT1.
smuPeripheralPCNT2	SMU peripheral identifier for PCNT2.
smuPeripheralQSPI0	SMU peripheral identifier for QSPI0.
smuPeripheralRMU	SMU peripheral identifier for RMU.
smuPeripheralRTC	SMU peripheral identifier for RTC.
smuPeripheralRTCC	SMU peripheral identifier for RTCC.
smuPeripheralSDIO	SMU peripheral identifier for SDIO.
smuPeripheralSMU	SMU peripheral identifier for SMU.
smuPeripheralTIMER0	SMU peripheral identifier for TIMER0.
smuPeripheralTIMER1	SMU peripheral identifier for TIMER1.
smuPeripheralTIMER2	SMU peripheral identifier for TIMER2.
smuPeripheralTIMER3	SMU peripheral identifier for TIMER3.
smuPeripheralTRNG0	SMU peripheral identifier for TRNG0.
smuPeripheralUART0	SMU peripheral identifier for UART0.
smuPeripheralUART1	SMU peripheral identifier for UART1.
smuPeripheralUSART0	SMU peripheral identifier for USART0.
smuPeripheralUSART1	SMU peripheral identifier for USART1.
smuPeripheralUSART2	SMU peripheral identifier for USART2.
smuPeripheralUSART3	SMU peripheral identifier for USART3.
smuPeripheralUSART4	SMU peripheral identifier for USART4.
smuPeripheralUSB	SMU peripheral identifier for USB.
smuPeripheralWDOG0	SMU peripheral identifier for WDOG0.
smuPeripheralWDOG1	SMU peripheral identifier for WDOG1.
smuPeripheralWTIMER0	SMU peripheral identifier for WTIMER0.
smuPeripheralWTIMER1	SMU peripheral identifier for WTIMER1.
smuPeripheralEnd	SMU peripheral end.

Definition at line 72 of file platform/emlib/inc/em_smu.h

Function Documentation#

SMU_EnablePPU#

void SMU_EnablePPU (bool enable)

Enable or disable PPU of SMU.

Parameters

[in]

enable

Set to true to enable PPU; set to false otherwise.

Definition at line 1339 of file platform/emlib/inc/em_smu.h

SMU_Init#

void SMU_Init (const SMU_Init_TypeDef * init)

Initialize PPU of SMU.

Parameters

[in]

init

Pointer to initialization structure that defines which peripherals should only be accessed from privileged mode, and if PPU should be enabled.

Definition at line 1356 of file platform/emlib/inc/em_smu.h

SMU_SetPrivilegedAccess#

void SMU_SetPrivilegedAccess (SMU_Peripheral_TypeDef peripheral, bool privileged)

Change access settings for a peripheral.

Parameters

[in]	peripheral	ID of the peripheral to change access settings for.
[in]	privileged	Set to true if the peripheral should only be accessed from privileged mode; set to false otherwise.

Set to limit access of a peripheral from privileged mode.

Definition at line 1383 of file platform/emlib/inc/em_smu.h

SMU_GetFaultingPeripheral#

SMU_Peripheral_TypeDef SMU_GetFaultingPeripheral (void )

Get the ID of the peripheral that caused an access fault.

Parameters

N/A

Note

The return value is only valid if SMU_IF_PPUPRIV interrupt flag is set.

Returns

ID of the peripheral that caused an access fault.

Definition at line 1415 of file platform/emlib/inc/em_smu.h

SMU_IntClear#

void SMU_IntClear (uint32_t flags)

Clear one or more pending SMU interrupts.

Parameters

[in]

flags

Bitwise logic OR of SMU interrupt sources to clear.

Definition at line 1432 of file platform/emlib/inc/em_smu.h

SMU_IntDisable#

void SMU_IntDisable (uint32_t flags)

Disable one or more SMU interrupts.

Parameters

[in]

flags

SMU interrupt sources to disable.

Definition at line 1453 of file platform/emlib/inc/em_smu.h

SMU_IntEnable#

void SMU_IntEnable (uint32_t flags)

Enable one or more SMU interrupts.

Parameters

[in]

flags

SMU interrupt sources to enable.

Note

Depending on the use, a pending interrupt may already be set prior to enabling the interrupt. To ignore a pending interrupt, consider using SMU_IntClear() prior to enabling the interrupt.

Definition at line 1479 of file platform/emlib/inc/em_smu.h

SMU_IntGet#

uint32_t SMU_IntGet (void )

Get pending SMU interrupts.

Parameters

N/A

Returns

SMU interrupt sources pending.

Definition at line 1500 of file platform/emlib/inc/em_smu.h

SMU_IntGetEnabled#

uint32_t SMU_IntGetEnabled (void )

Get enabled and pending SMU interrupt flags.

Parameters

N/A

Useful for handling more interrupt sources in the same interrupt handler.

Note

Interrupt flags are not cleared by this function.

Returns

Pending and enabled SMU interrupt sources. The return value is the bitwise AND combination of
- the OR combination of enabled interrupt sources in SMU_IEN register and
- the OR combination of valid interrupt flags in SMU_IF register.

Definition at line 1525 of file platform/emlib/inc/em_smu.h

SMU_IntSet#

void SMU_IntSet (uint32_t flags)

Set one or more pending SMU interrupts from SW.

Parameters

[in]

flags

SMU interrupt sources to set to pending.

Definition at line 1554 of file platform/emlib/inc/em_smu.h

Macro Definition Documentation#

SMU_INIT_DEFAULT#

#define SMU_INIT_DEFAULT

Value:

{ \

{ { 0 } }, /* No peripherals access protected. */ \

true /* Enable SMU.*/ \

}

Default SMU initialization structure settings.

Definition at line 1323 of file platform/emlib/inc/em_smu.h