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
smuPeripheralADC0 = _SMU_PPUPATD0_ADC0_SHIFT
smuPeripheralCAN0 = _SMU_PPUPATD0_CAN0_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
smuPeripheralEMU = _SMU_PPUPATD0_EMU_SHIFT
smuPeripheralGPCRC = _SMU_PPUPATD0_GPCRC_SHIFT
smuPeripheralGPIO = _SMU_PPUPATD0_GPIO_SHIFT
smuPeripheralI2C0 = _SMU_PPUPATD0_I2C0_SHIFT
smuPeripheralI2C1 = _SMU_PPUPATD0_I2C1_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
smuPeripheralLEUART0 = _SMU_PPUPATD0_LEUART0_SHIFT
smuPeripheralPCNT0 = _SMU_PPUPATD0_PCNT0_SHIFT
smuPeripheralRMU = _SMU_PPUPATD0_RMU_SHIFT
smuPeripheralRTCC = _SMU_PPUPATD0_RTCC_SHIFT
smuPeripheralSMU = _SMU_PPUPATD0_SMU_SHIFT
smuPeripheralTIMER0 = _SMU_PPUPATD0_TIMER0_SHIFT
smuPeripheralTIMER1 = _SMU_PPUPATD0_TIMER1_SHIFT
smuPeripheralTRNG0 = _SMU_PPUPATD0_TRNG0_SHIFT
smuPeripheralUART0 = _SMU_PPUPATD0_UART0_SHIFT
smuPeripheralUSART0 = _SMU_PPUPATD0_USART0_SHIFT
smuPeripheralUSART1 = _SMU_PPUPATD0_USART1_SHIFT
smuPeripheralUSART2 = _SMU_PPUPATD0_USART2_SHIFT
smuPeripheralUSART3 = 32 + _SMU_PPUPATD1_USART3_SHIFT
smuPeripheralWDOG0 = 32 + _SMU_PPUPATD1_WDOG0_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.

smuPeripheralADC0

SMU peripheral identifier for ADC0.

smuPeripheralCAN0

SMU peripheral identifier for CAN0.

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.

smuPeripheralEMU

SMU peripheral identifier for EMU.

smuPeripheralGPCRC

SMU peripheral identifier for GPCRC.

smuPeripheralGPIO

SMU peripheral identifier for GPIO.

smuPeripheralI2C0

SMU peripheral identifier for I2C0.

smuPeripheralI2C1

SMU peripheral identifier for I2C1.

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.

smuPeripheralLEUART0

SMU peripheral identifier for LEUART0.

smuPeripheralPCNT0

SMU peripheral identifier for PCNT0.

smuPeripheralRMU

SMU peripheral identifier for RMU.

smuPeripheralRTCC

SMU peripheral identifier for RTCC.

smuPeripheralSMU

SMU peripheral identifier for SMU.

smuPeripheralTIMER0

SMU peripheral identifier for TIMER0.

smuPeripheralTIMER1

SMU peripheral identifier for TIMER0.

smuPeripheralTRNG0

SMU peripheral identifier for TRNG0.

smuPeripheralUART0

SMU peripheral identifier for UART0.

smuPeripheralUSART0

SMU peripheral identifier for USART0.

smuPeripheralUSART1

SMU peripheral identifier for USART1.

smuPeripheralUSART2

SMU peripheral identifier for USART2.

smuPeripheralUSART3

SMU peripheral identifier for USART3.

smuPeripheralWDOG0

SMU peripheral identifier for WDOG0.

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 1425 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 1442 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 1475 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 1519 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 1536 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 1557 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 1583 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 1604 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 1629 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 1658 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 1409 of file platform/emlib/inc/em_smu.h