CORE
EMLIB

Detailed Description

Core interrupt handling API.


Introduction

CORE interrupt API provides a simple and safe means to disable and enable interrupts to protect sections of code.

This is often referred to as "critical sections". This module provides support for three types of critical sections, each with different interrupt blocking capabilities.

  • CRITICAL section: Inside a critical section, all interrupts are disabled (except for fault handlers). The PRIMASK register is always used for interrupt disable/enable.
  • ATOMIC section: This type of section is configurable and the default method is to use PRIMASK. With BASEPRI configuration, interrupts with priority equal to or lower than a given configurable level are disabled. The interrupt disable priority level is defined at compile time. The BASEPRI register is not available for all architectures.
  • NVIC mask section: Disable NVIC (external interrupts) on an individual manner.

em_core also has an API for manipulating RAM-based interrupt vector tables.


Compile-time Configuration

The following #defines are used to configure em_core:

// The interrupt priority level used inside ATOMIC sections.
#define CORE_ATOMIC_BASE_PRIORITY_LEVEL 3
// A method used for interrupt disable/enable within ATOMIC sections.
#define CORE_ATOMIC_METHOD CORE_ATOMIC_METHOD_PRIMASK

If the default values do not support your needs, they can be overridden by supplying -D compiler flags on the compiler command line or by collecting all macro redefinitions in a file named emlib_config.h and then supplying -DEMLIB_USER_CONFIG on a compiler command line.

Note
The default emlib configuration for ATOMIC section interrupt disable method is using PRIMASK, i.e., ATOMIC sections are implemented as CRITICAL sections.
Due to architectural limitations Cortex-M0+ devices do not support ATOMIC type critical sections using the BASEPRI register. On M0+ devices ATOMIC section helper macros are available but they are implemented as CRITICAL sections using PRIMASK register.


Macro API

The primary em_core API is the macro API. Macro API will map to correct CORE functions according to the selected CORE_ATOMIC_METHOD and similar configurations (the full CORE API is of course also available). The most useful macros are as follows:

CORE_DECLARE_IRQ_STATE
CORE_ENTER_ATOMIC()
CORE_EXIT_ATOMIC()
Used together to implement an ATOMIC section.

{
CORE_DECLARE_IRQ_STATE ; // Storage for saving IRQ state prior to
// atomic section entry.
CORE_ENTER_ATOMIC (); // Enter atomic section.
...
... your code goes here ...
...
CORE_EXIT_ATOMIC (); // Exit atomic section, IRQ state is restored.
}


CORE_ATOMIC_SECTION(yourcode)
A concatenation of all three macros above.

{
CORE_ATOMIC_SECTION (
...
... your code goes here ...
...
)
}


CORE_DECLARE_IRQ_STATE
CORE_ENTER_CRITICAL()
CORE_EXIT_CRITICAL()
CORE_CRITICAL_SECTION(yourcode)
These macros implement CRITICAL sections in a similar fashion as described above for ATOMIC sections.


CORE_DECLARE_NVIC_STATE
CORE_ENTER_NVIC()
CORE_EXIT_NVIC()
CORE_NVIC_SECTION(yourcode)
These macros implement NVIC mask sections in a similar fashion as described above for ATOMIC sections. See Examples for an example.

Refer to Macros or Macro Definition Documentation below for a full list of macros.


API reimplementation

Most of the functions in the API are implemented as weak functions. This means that it is easy to reimplement when special needs arise. Shown below is a reimplementation of CRITICAL sections suitable if FreeRTOS OS is used:

CORE_irqState_t CORE_EnterCritical ( void )
{
vPortEnterCritical();
return 0;
}
void CORE_ExitCritical ( CORE_irqState_t irqState)
{
(void)irqState;
vPortExitCritical();
}

Also note that CORE_Enter/ExitCritical() are not implemented as inline functions. As a result, reimplementations will be possible even when original implementations are inside a linked library.

Some RTOSes must be notified on interrupt handler entry and exit. Macros CORE_INTERRUPT_ENTRY() and CORE_INTERRUPT_EXIT() are suitable placeholders for inserting such code. Insert these macros in all your interrupt handlers and then override the default macro implementations. This is an example if uC/OS is used:

// In emlib_config.h:
#define CORE_INTERRUPT_ENTRY() OSIntEnter()
#define CORE_INTERRUPT_EXIT() OSIntExit()


Interrupt vector tables

When using RAM based interrupt vector tables it is the user's responsibility to allocate the table space correctly. The tables must be aligned as specified in the CPU reference manual.

CORE_InitNvicVectorTable()
Initialize a RAM based vector table by copying table entries from a source vector table to a target table. VTOR is set to the address of the target vector table.


CORE_GetNvicRamTableHandler()
CORE_SetNvicRamTableHandler()
Use these functions to get or set the interrupt handler for a specific IRQn. They both use the interrupt vector table defined by the current VTOR register value.


Examples

Implement an NVIC critical section:

{
CORE_DECLARE_NVIC_ZEROMASK (mask); // A zero initialized NVIC disable mask
// Set mask bits for IRQs to block in the NVIC critical section.
// In many cases, you can create the disable mask once upon application
// startup and use the mask globally throughout the application lifetime.
CORE_NvicMaskSetIRQ (LEUART0_IRQn, &mask);
CORE_NvicMaskSetIRQ (VCMP_IRQn, &mask);
// Enter NVIC critical section with the disable mask
CORE_NVIC_SECTION (&mask,
...
... your code goes here ...
...
)
}


Porting from em_int

Existing code using INT_Enable() and INT_Disable() must be ported to the em_core API. While em_int used, a global counter to store the interrupt state, em_core uses a local variable. Any usage of INT_Disable() , therefore, needs to be replaced with a declaration of the interrupt state variable before entering the critical section.

Since the state variable is in local scope, the critical section exit needs to occur within the scope of the variable. If multiple nested critical sections are used, each needs to have its own state variable in its own scope.

In many cases, completely disabling all interrupts using CRITICAL sections might be more heavy-handed than needed. When porting, consider whether other types of sections, such as ATOMIC or NVIC mask, can be used to only disable a subset of the interrupts.

Replacing em_int calls with em_core function calls:

void func( void )
{
// INT_Disable();
CORE_DECLARE_IRQ_STATE ;
CORE_ENTER_ATOMIC ();
.
.
.
// INT_Enable();
CORE_EXIT_ATOMIC ();
}

Data Structures

struct CORE_nvicMask_t

Macros

#define CORE_ATOMIC_BASE_PRIORITY_LEVEL 3
#define CORE_ATOMIC_IRQ_DISABLE () CORE_AtomicDisableIrq ()
#define CORE_ATOMIC_IRQ_ENABLE () CORE_AtomicEnableIrq ()
#define CORE_ATOMIC_METHOD CORE_ATOMIC_METHOD_PRIMASK
#define CORE_ATOMIC_METHOD_BASEPRI 1
#define CORE_ATOMIC_METHOD_PRIMASK 0
#define CORE_ATOMIC_SECTION (yourcode)
#define CORE_CRITICAL_IRQ_DISABLE () CORE_CriticalDisableIrq ()
#define CORE_CRITICAL_IRQ_ENABLE () CORE_CriticalEnableIrq ()
#define CORE_CRITICAL_SECTION (yourcode)
#define CORE_DECLARE_IRQ_STATE CORE_irqState_t irqState
#define CORE_DECLARE_NVIC_MASK (x) CORE_nvicMask_t x
#define CORE_DECLARE_NVIC_STATE CORE_nvicMask_t nvicState
#define CORE_DECLARE_NVIC_ZEROMASK (x) CORE_nvicMask_t x = { { 0 } }
#define CORE_DEFAULT_VECTOR_TABLE_ENTRIES (EXT_IRQ_COUNT + 16)
#define CORE_ENTER_ATOMIC ()    irqState = CORE_EnterAtomic ()
#define CORE_ENTER_CRITICAL ()    irqState = CORE_EnterCritical ()
#define CORE_ENTER_NVIC (disable) CORE_EnterNvicMask (&nvicState, disable)
#define CORE_EXIT_ATOMIC () CORE_ExitAtomic (irqState)
#define CORE_EXIT_CRITICAL () CORE_ExitCritical (irqState)
#define CORE_EXIT_NVIC () CORE_NvicEnableMask (&nvicState)
#define CORE_IN_IRQ_CONTEXT () CORE_InIrqContext ()
#define CORE_INTERRUPT_ENTRY ()
#define CORE_INTERRUPT_EXIT ()
#define CORE_IRQ_DISABLED () CORE_IrqIsDisabled ()
#define CORE_NVIC_DISABLE (mask) CORE_NvicDisableMask (mask)
#define CORE_NVIC_ENABLE (mask) CORE_NvicEnableMask (mask)
#define CORE_NVIC_REG_WORDS ((EXT_IRQ_COUNT + 31) / 32)
#define CORE_NVIC_SECTION (mask, yourcode)
#define CORE_YIELD_ATOMIC () CORE_YieldAtomic ()
#define CORE_YIELD_CRITICAL () CORE_YieldCritical ()
#define CORE_YIELD_NVIC (enable) CORE_YieldNvicMask (enable)

Typedefs

typedef uint32_t CORE_irqState_t

Functions

void CORE_AtomicDisableIrq (void)
Disable interrupts.
void CORE_AtomicEnableIrq (void)
Enable interrupts.
void CORE_CriticalDisableIrq (void)
Disable interrupts.
void CORE_CriticalEnableIrq (void)
Enable interrupts.
CORE_irqState_t CORE_EnterAtomic (void)
Enter an ATOMIC section.
CORE_irqState_t CORE_EnterCritical (void)
Enter a CRITICAL section.
void CORE_EnterNvicMask ( CORE_nvicMask_t *nvicState, const CORE_nvicMask_t *disable)
Enter a NVIC mask section.
void CORE_ExitAtomic ( CORE_irqState_t irqState)
Exit an ATOMIC section.
void CORE_ExitCritical ( CORE_irqState_t irqState)
Exit a CRITICAL section.
void CORE_GetNvicEnabledMask ( CORE_nvicMask_t *mask)
Get the current NVIC enable mask state.
bool CORE_GetNvicMaskDisableState (const CORE_nvicMask_t *mask)
Get NVIC disable state for a given mask.
void * CORE_GetNvicRamTableHandler (IRQn_Type irqN)
Utility function to get the handler for a specific interrupt.
bool CORE_InIrqContext (void)
Check whether the current CPU operation mode is handler mode.
void CORE_InitNvicVectorTable (uint32_t *sourceTable, uint32_t sourceSize, uint32_t *targetTable, uint32_t targetSize, void *defaultHandler, bool overwriteActive)
Initialize an interrupt vector table by copying table entries from a source to a target table.
bool CORE_IrqIsBlocked (IRQn_Type irqN)
Check if a specific interrupt is disabled or blocked.
bool CORE_IrqIsDisabled (void)
Check if interrupts are disabled.
void CORE_NvicDisableMask (const CORE_nvicMask_t *disable)
Disable NVIC interrupts.
void CORE_NvicEnableMask (const CORE_nvicMask_t *enable)
Set current NVIC interrupt enable mask.
bool CORE_NvicIRQDisabled (IRQn_Type irqN)
Check if an NVIC interrupt is disabled.
void CORE_NvicMaskClearIRQ (IRQn_Type irqN, CORE_nvicMask_t *mask)
Utility function to clear an IRQn bit in a NVIC enable/disable mask.
void CORE_NvicMaskSetIRQ (IRQn_Type irqN, CORE_nvicMask_t *mask)
Utility function to set an IRQn bit in a NVIC enable/disable mask.
void CORE_SetNvicRamTableHandler (IRQn_Type irqN, void *handler)
Utility function to set the handler for a specific interrupt.
void CORE_YieldAtomic (void)
Brief interrupt enable/disable sequence to allow handling of pending interrupts.
void CORE_YieldCritical (void)
Brief interrupt enable/disable sequence to allow handling of pending interrupts.
void CORE_YieldNvicMask (const CORE_nvicMask_t *enable)
Brief NVIC interrupt enable/disable sequence to allow handling of pending interrupts.

Macro Definition Documentation

#define CORE_ATOMIC_BASE_PRIORITY_LEVEL   3

The interrupt priority level disabled within ATOMIC regions. Interrupts with priority level equal to or lower than this definition will be disabled within ATOMIC regions.

Definition at line 267 of file em_core.c .

Referenced by CORE_AtomicDisableIrq() , CORE_EnterAtomic() , CORE_IrqIsDisabled() , and CORE_YieldAtomic() .

#define CORE_ATOMIC_IRQ_DISABLE ( ) CORE_AtomicDisableIrq ()

ATOMIC style interrupt disable.

Definition at line 118 of file em_core.h .

#define CORE_ATOMIC_IRQ_ENABLE ( ) CORE_AtomicEnableIrq ()

ATOMIC style interrupt enable.

Definition at line 121 of file em_core.h .

#define CORE_ATOMIC_METHOD CORE_ATOMIC_METHOD_PRIMASK

Specify which method to use when implementing ATOMIC sections. You can select between BASEPRI or PRIMASK method.

Note
On Cortex-M0+ devices only PRIMASK can be used.

Definition at line 274 of file em_core.c .

#define CORE_ATOMIC_METHOD_BASEPRI   1

Use BASEPRI register to disable interrupts in ATOMIC sections.

Definition at line 56 of file em_core.h .

#define CORE_ATOMIC_METHOD_PRIMASK   0

Use PRIMASK register to disable interrupts in ATOMIC sections.

Definition at line 53 of file em_core.h .

#define CORE_ATOMIC_SECTION ( yourcode )
Value:
{ \
CORE_DECLARE_IRQ_STATE; \
CORE_ENTER_ATOMIC(); \
{ \
yourcode \
} \
CORE_EXIT_ATOMIC(); \
}

Convenience macro for implementing an ATOMIC section.

Definition at line 124 of file em_core.h .

Referenced by DMADRV_TransferDone() , DMADRV_TransferRemainingCount() , GPIOINT_CallbackRegister() , RTCDRV_FreeTimer() , SPIDRV_GetTransferStatus() , UARTDRV_Transmit() , USBD_AbortAllTransfers() , USBD_Connect() , USBD_Disconnect() , USBD_StallEp() , and USBD_UnStallEp() .

#define CORE_CRITICAL_IRQ_DISABLE ( ) CORE_CriticalDisableIrq ()

CRITICAL style interrupt disable.

Definition at line 86 of file em_core.h .

#define CORE_CRITICAL_IRQ_ENABLE ( ) CORE_CriticalEnableIrq ()

CRITICAL style interrupt enable.

Definition at line 89 of file em_core.h .

#define CORE_CRITICAL_SECTION ( yourcode )
Value:
{ \
CORE_DECLARE_IRQ_STATE; \
CORE_ENTER_CRITICAL(); \
{ \
yourcode \
} \
CORE_EXIT_CRITICAL(); \
}

Convenience macro for implementing a CRITICAL section.

Definition at line 92 of file em_core.h .

Referenced by CORE_EnterNvicMask() , CORE_GetNvicEnabledMask() , CORE_GetNvicMaskDisableState() , CORE_NvicDisableMask() , CORE_NvicEnableMask() , CORE_YieldNvicMask() , EMU_EnterEM2() , and EMU_EnterEM3() .

#define CORE_DECLARE_IRQ_STATE CORE_irqState_t irqState

Allocate storage for PRIMASK or BASEPRI value for use by CORE_ENTER/EXIT_ATOMIC() and CORE_ENTER/EXIT_CRITICAL() macros.

Definition at line 83 of file em_core.h .

Referenced by CAPLESENSE_Init() , DMADRV_AllocateChannel() , DMADRV_DeInit() , DMADRV_FreeChannel() , DMADRV_Init() , RETARGET_ReadChar() , RTC_IRQHandler() , RTCDRV_AllocateTimer() , RTCDRV_GetWallClockTicks32() , RTCDRV_GetWallClockTicks64() , RTCDRV_IsRunning() , RTCDRV_StartTimer() , RTCDRV_StopTimer() , RTCDRV_TimeRemaining() , sl_sleeptimer_get_remaining_time_of_first_timer() , sl_sleeptimer_get_tick_count64() , sl_sleeptimer_get_time() , sl_sleeptimer_get_timer_time_remaining() , sl_sleeptimer_get_tz() , sl_sleeptimer_init() , sl_sleeptimer_is_timer_running() , sl_sleeptimer_set_time() , sl_sleeptimer_set_tz() , sl_sleeptimer_stop_timer() , SLEEP_Sleep() , SPIDRV_AbortTransfer() , SPIDRV_Init() , SPIDRV_MTransferSingleItemB() , SPIDRV_SetBitrate() , SPIDRV_SetFramelength() , UARTDRV_Abort() , UARTDRV_InitLeuart() , UARTDRV_InitUart() , UDELAY_Calibrate() , USBD_AbortTransfer() , USBD_Init() , USBD_Read() , USBD_RemoteWakeup() , USBD_Write() , USBTIMER_Start() , USBTIMER_Stop() , and WDOGn_Feed() .

#define CORE_DECLARE_NVIC_MASK ( x ) CORE_nvicMask_t x

Allocate storage for NVIC interrupt masks.

Parameters
[in] x The storage variable name to use.

Definition at line 156 of file em_core.h .

#define CORE_DECLARE_NVIC_STATE CORE_nvicMask_t nvicState

Allocate storage for NVIC interrupt masks for use by CORE_ENTER/EXIT_NVIC() macros.

Definition at line 151 of file em_core.h .

#define CORE_DECLARE_NVIC_ZEROMASK ( x ) CORE_nvicMask_t x = { { 0 } }

Allocate storage for and zero initialize NVIC interrupt mask.

Parameters
[in] x The storage variable name to use.

Definition at line 161 of file em_core.h .

#define CORE_DEFAULT_VECTOR_TABLE_ENTRIES   (EXT_IRQ_COUNT + 16)

Number of entries in a default interrupt vector table.

Definition at line 62 of file em_core.h .

#define CORE_ENTER_ATOMIC ( ) irqState = CORE_EnterAtomic ()

Enter ATOMIC section. Assumes that a CORE_DECLARE_IRQ_STATE exist in scope.

Definition at line 136 of file em_core.h .

Referenced by CAPLESENSE_Init() , DMADRV_AllocateChannel() , DMADRV_DeInit() , DMADRV_FreeChannel() , DMADRV_Init() , RETARGET_ReadChar() , RTC_IRQHandler() , RTCDRV_AllocateTimer() , RTCDRV_GetWallClockTicks32() , RTCDRV_GetWallClockTicks64() , RTCDRV_IsRunning() , RTCDRV_StartTimer() , RTCDRV_StopTimer() , RTCDRV_TimeRemaining() , sl_sleeptimer_get_remaining_time_of_first_timer() , sl_sleeptimer_get_tick_count64() , sl_sleeptimer_get_time() , sl_sleeptimer_get_timer_time_remaining() , sl_sleeptimer_get_tz() , sl_sleeptimer_init() , sl_sleeptimer_is_timer_running() , sl_sleeptimer_set_time() , sl_sleeptimer_set_tz() , sl_sleeptimer_stop_timer() , SPIDRV_AbortTransfer() , SPIDRV_Init() , SPIDRV_MTransferSingleItemB() , SPIDRV_SetBitrate() , SPIDRV_SetFramelength() , UARTDRV_Abort() , UARTDRV_InitLeuart() , UARTDRV_InitUart() , UDELAY_Calibrate() , USBD_AbortTransfer() , USBD_Init() , USBD_Read() , USBD_RemoteWakeup() , USBD_Write() , USBTIMER_Start() , USBTIMER_Stop() , and WDOGn_Feed() .

#define CORE_ENTER_CRITICAL ( ) irqState = CORE_EnterCritical ()

Enter CRITICAL section. Assumes that a CORE_DECLARE_IRQ_STATE exist in scope.

Definition at line 104 of file em_core.h .

Referenced by EMU_EM23PresleepHook() , nvm3_lockBegin() , and SLEEP_Sleep() .

#define CORE_ENTER_NVIC ( disable ) CORE_EnterNvicMask (&nvicState, disable)

Enter NVIC mask section. Assumes that a CORE_DECLARE_NVIC_STATE exist in scope.

Parameters
[in] disable Mask specifying which NVIC interrupts to disable within the section.

Definition at line 192 of file em_core.h .

#define CORE_EXIT_ATOMIC ( ) CORE_ExitAtomic (irqState)

Exit ATOMIC section. Assumes that a CORE_DECLARE_IRQ_STATE exist in scope.

Definition at line 140 of file em_core.h .

Referenced by CAPLESENSE_Init() , DMADRV_AllocateChannel() , DMADRV_DeInit() , DMADRV_FreeChannel() , DMADRV_Init() , RETARGET_ReadChar() , RTC_IRQHandler() , RTCDRV_AllocateTimer() , RTCDRV_GetWallClockTicks32() , RTCDRV_GetWallClockTicks64() , RTCDRV_IsRunning() , RTCDRV_StartTimer() , RTCDRV_StopTimer() , RTCDRV_TimeRemaining() , sl_sleeptimer_get_remaining_time_of_first_timer() , sl_sleeptimer_get_tick_count64() , sl_sleeptimer_get_time() , sl_sleeptimer_get_timer_time_remaining() , sl_sleeptimer_get_tz() , sl_sleeptimer_init() , sl_sleeptimer_is_timer_running() , sl_sleeptimer_set_time() , sl_sleeptimer_set_tz() , sl_sleeptimer_stop_timer() , SPIDRV_AbortTransfer() , SPIDRV_Init() , SPIDRV_MTransferSingleItemB() , SPIDRV_SetBitrate() , SPIDRV_SetFramelength() , UARTDRV_Abort() , UARTDRV_InitLeuart() , UARTDRV_InitUart() , UDELAY_Calibrate() , USBD_AbortTransfer() , USBD_Init() , USBD_Read() , USBD_RemoteWakeup() , USBD_Write() , USBTIMER_Start() , USBTIMER_Stop() , and WDOGn_Feed() .

#define CORE_EXIT_CRITICAL ( ) CORE_ExitCritical (irqState)

Exit CRITICAL section. Assumes that a CORE_DECLARE_IRQ_STATE exist in scope.

Definition at line 108 of file em_core.h .

Referenced by EMU_EM23PostsleepHook() , nvm3_lockEnd() , and SLEEP_Sleep() .

#define CORE_EXIT_NVIC ( ) CORE_NvicEnableMask (&nvicState)

Exit NVIC mask section. Assumes that a CORE_DECLARE_NVIC_STATE exist in scope.

Definition at line 196 of file em_core.h .

#define CORE_IN_IRQ_CONTEXT ( ) CORE_InIrqContext ()

Check if inside an IRQ handler.

Definition at line 211 of file em_core.h .

#define CORE_INTERRUPT_ENTRY ( )

Placeholder for optional interrupt handler entry code. This might be needed when working with an RTOS.

Definition at line 283 of file em_core.c .

#define CORE_INTERRUPT_EXIT ( )

Placeholder for optional interrupt handler exit code. This might be needed when working with an RTOS.

Definition at line 289 of file em_core.c .

#define CORE_IRQ_DISABLED ( ) CORE_IrqIsDisabled ()

Check if IRQ is disabled.

Definition at line 208 of file em_core.h .

#define CORE_NVIC_DISABLE ( mask ) CORE_NvicDisableMask (mask)

NVIC mask style interrupt disable.

Parameters
[in] mask Mask specifying which NVIC interrupts to disable.

Definition at line 166 of file em_core.h .

#define CORE_NVIC_ENABLE ( mask ) CORE_NvicEnableMask (mask)

NVIC mask style interrupt enable.

Parameters
[in] mask Mask specifying which NVIC interrupts to enable.

Definition at line 171 of file em_core.h .

#define CORE_NVIC_REG_WORDS   ((EXT_IRQ_COUNT + 31) / 32)

Number of words in a NVIC mask set.

Definition at line 59 of file em_core.h .

#define CORE_NVIC_SECTION ( mask,
yourcode
)
Value:
{ \
CORE_DECLARE_NVIC_STATE; \
CORE_ENTER_NVIC(mask); \
{ \
yourcode \
} \
CORE_EXIT_NVIC(); \
}

Convenience macro for implementing a NVIC mask section.

Parameters
[in] mask Mask specifying which NVIC interrupts to disable within the section.
[in] yourcode The code for the section.

Definition at line 178 of file em_core.h .

#define CORE_YIELD_ATOMIC ( ) CORE_YieldAtomic ()

ATOMIC style yield.

Definition at line 143 of file em_core.h .

#define CORE_YIELD_CRITICAL ( ) CORE_YieldCritical ()

CRITICAL style yield.

Definition at line 111 of file em_core.h .

#define CORE_YIELD_NVIC ( enable ) CORE_YieldNvicMask (enable)

NVIC maks style yield.

Parameters
[in] enable Mask specifying which NVIC interrupts to briefly enable.

Definition at line 201 of file em_core.h .

Typedef Documentation

typedef uint32_t CORE_irqState_t

Storage for PRIMASK or BASEPRI value.

Definition at line 218 of file em_core.h .

Function Documentation

SL_WEAK void CORE_AtomicDisableIrq ( void )

Disable interrupts.

Disable interrupts with a priority lower or equal to CORE_ATOMIC_BASE_PRIORITY_LEVEL . Sets core BASEPRI register to CORE_ATOMIC_BASE_PRIORITY_LEVEL.

Note
If CORE_ATOMIC_METHOD is CORE_ATOMIC_METHOD_PRIMASK , this function is identical to CORE_CriticalDisableIrq() .

Definition at line 387 of file em_core.c .

References CORE_ATOMIC_BASE_PRIORITY_LEVEL .

SL_WEAK void CORE_AtomicEnableIrq ( void )

Enable interrupts.

Enable interrupts by setting core BASEPRI register to 0.

Note
If CORE_ATOMIC_METHOD is CORE_ATOMIC_METHOD_BASEPRI and PRIMASK is set (CPU is inside a CRITICAL section), interrupts will still be disabled after calling this function.
If CORE_ATOMIC_METHOD is CORE_ATOMIC_METHOD_PRIMASK , this function is identical to CORE_CriticalEnableIrq() .

Definition at line 411 of file em_core.c .

SL_WEAK void CORE_CriticalDisableIrq ( void )

Disable interrupts.

Disable all interrupts by setting PRIMASK. (Fault exception handlers will still be enabled).

Definition at line 309 of file em_core.c .

SL_WEAK void CORE_CriticalEnableIrq ( void )

Enable interrupts.

Enable interrupts by clearing PRIMASK.

Definition at line 320 of file em_core.c .

SL_WEAK CORE_irqState_t CORE_EnterAtomic ( void )

Enter an ATOMIC section.

When an ATOMIC section is entered, interrupts with priority lower or equal to CORE_ATOMIC_BASE_PRIORITY_LEVEL are disabled.

Note
If CORE_ATOMIC_METHOD is CORE_ATOMIC_METHOD_PRIMASK , this function is identical to CORE_EnterCritical() .
Returns
The value of BASEPRI register prior to ATOMIC section entry.

Definition at line 434 of file em_core.c .

References CORE_ATOMIC_BASE_PRIORITY_LEVEL .

SL_WEAK CORE_irqState_t CORE_EnterCritical ( void )

Enter a CRITICAL section.

When a CRITICAL section is entered, all interrupts (except fault handlers) are disabled.

Returns
The value of PRIMASK register prior to the CRITICAL section entry.

Definition at line 335 of file em_core.c .

void CORE_EnterNvicMask ( CORE_nvicMask_t * nvicState,
const CORE_nvicMask_t * disable
)

Enter a NVIC mask section.

When a NVIC mask section is entered, specified NVIC interrupts are disabled.

Parameters
[out] nvicState Return NVIC interrupts enable mask prior to section entry.
[in] disable A mask specifying which NVIC interrupts to disable within the section.

Definition at line 514 of file em_core.c .

References CORE_CRITICAL_SECTION .

SL_WEAK void CORE_ExitAtomic ( CORE_irqState_t irqState )

Exit an ATOMIC section.

Parameters
[in] irqState The interrupt priority blocking level to restore to BASEPRI when exiting the ATOMIC section. This value is usually the one returned by a prior call to CORE_EnterAtomic() .
Note
If CORE_ATOMIC_METHOD is set to CORE_ATOMIC_METHOD_PRIMASK , this function is identical to CORE_ExitCritical() .

Definition at line 460 of file em_core.c .

SL_WEAK void CORE_ExitCritical ( CORE_irqState_t irqState )

Exit a CRITICAL section.

Parameters
[in] irqState The interrupt priority blocking level to restore to PRIMASK when exiting the CRITICAL section. This value is usually the one returned by a prior call to CORE_EnterCritical() .

Definition at line 351 of file em_core.c .

void CORE_GetNvicEnabledMask ( CORE_nvicMask_t * mask )

Get the current NVIC enable mask state.

Parameters
[out] mask The current NVIC enable mask.

Definition at line 727 of file em_core.c .

References CORE_CRITICAL_SECTION .

bool CORE_GetNvicMaskDisableState ( const CORE_nvicMask_t * mask )

Get NVIC disable state for a given mask.

Parameters
[in] mask An NVIC mask to check.
Returns
True if all NVIC interrupt mask bits are clear.

Definition at line 744 of file em_core.c .

References CORE_nvicMask_t::a , and CORE_CRITICAL_SECTION .

void * CORE_GetNvicRamTableHandler ( IRQn_Type irqN )

Utility function to get the handler for a specific interrupt.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt.
Returns
The handler address.
Note
Uses the interrupt vector table defined by the current VTOR register value.

Definition at line 799 of file em_core.c .

SL_WEAK bool CORE_InIrqContext ( void )

Check whether the current CPU operation mode is handler mode.

Returns
True if the CPU is in handler mode (currently executing an interrupt handler).
False if the CPU is in thread mode.

Definition at line 644 of file em_core.c .

void CORE_InitNvicVectorTable ( uint32_t * sourceTable,
uint32_t sourceSize,
uint32_t * targetTable,
uint32_t targetSize,
void * defaultHandler,
bool overwriteActive
)

Initialize an interrupt vector table by copying table entries from a source to a target table.

Note
This function will set a new VTOR register value.
Parameters
[in] sourceTable The address of the source vector table.
[in] sourceSize A number of entries in the source vector table.
[in] targetTable The address of the target (new) vector table.
[in] targetSize A number of entries in the target vector table.
[in] defaultHandler An address of the interrupt handler used for target entries for which where there is no corresponding source entry (i.e., the target table is larger than the source table).
[in] overwriteActive When true, a target table entry is always overwritten with the corresponding source entry. If false, a target table entry is only overwritten if it is zero. This makes it possible for an application to partly initialize a target table before passing it to this function.

Definition at line 855 of file em_core.c .

SL_WEAK bool CORE_IrqIsBlocked ( IRQn_Type irqN )

Check if a specific interrupt is disabled or blocked.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt to check.
Returns
True if the interrupt is disabled or blocked.

Definition at line 659 of file em_core.c .

References CORE_NvicIRQDisabled() .

Referenced by UARTDRV_ForceTransmit() .

SL_WEAK bool CORE_IrqIsDisabled ( void )

Check if interrupts are disabled.

Returns
True if interrupts are disabled.

Definition at line 708 of file em_core.c .

References CORE_ATOMIC_BASE_PRIORITY_LEVEL .

void CORE_NvicDisableMask ( const CORE_nvicMask_t * disable )

Disable NVIC interrupts.

Parameters
[in] disable A mask specifying which NVIC interrupts to disable.

Definition at line 530 of file em_core.c .

References CORE_CRITICAL_SECTION .

void CORE_NvicEnableMask ( const CORE_nvicMask_t * enable )

Set current NVIC interrupt enable mask.

Parameters
[out] enable A mask specifying which NVIC interrupts are currently enabled.

Definition at line 544 of file em_core.c .

References CORE_CRITICAL_SECTION .

bool CORE_NvicIRQDisabled ( IRQn_Type irqN )

Check if an NVIC interrupt is disabled.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt to check.
Returns
True if the interrupt is disabled.

Definition at line 776 of file em_core.c .

References CORE_nvicMask_t::a .

Referenced by CORE_IrqIsBlocked() .

void CORE_NvicMaskClearIRQ ( IRQn_Type irqN,
CORE_nvicMask_t * mask
)

Utility function to clear an IRQn bit in a NVIC enable/disable mask.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt.
[in,out] mask The mask to clear the interrupt bit in.

Definition at line 630 of file em_core.c .

References CORE_nvicMask_t::a .

void CORE_NvicMaskSetIRQ ( IRQn_Type irqN,
CORE_nvicMask_t * mask
)

Utility function to set an IRQn bit in a NVIC enable/disable mask.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt.
[in,out] mask The mask to set the interrupt bit in.

Definition at line 614 of file em_core.c .

References CORE_nvicMask_t::a .

void CORE_SetNvicRamTableHandler ( IRQn_Type irqN,
void * handler
)

Utility function to set the handler for a specific interrupt.

Parameters
[in] irqN The IRQn_Type enumerator for the interrupt.
[in] handler The handler address.
Note
Uses the interrupt vector table defined by the current VTOR register value.

Definition at line 818 of file em_core.c .

SL_WEAK void CORE_YieldAtomic ( void )

Brief interrupt enable/disable sequence to allow handling of pending interrupts.

Note
Usully used within an ATOMIC section.
If CORE_ATOMIC_METHOD is CORE_ATOMIC_METHOD_PRIMASK , this function is identical to CORE_YieldCritical() .

Definition at line 483 of file em_core.c .

References CORE_ATOMIC_BASE_PRIORITY_LEVEL .

SL_WEAK void CORE_YieldCritical ( void )

Brief interrupt enable/disable sequence to allow handling of pending interrupts.

Note
Usually used within a CRITICAL section.

Definition at line 366 of file em_core.c .

void CORE_YieldNvicMask ( const CORE_nvicMask_t * enable )

Brief NVIC interrupt enable/disable sequence to allow handling of pending interrupts.

Parameters
[in] enable A mask specifying which NVIC interrupts to briefly enable.
Note
Usually used within an NVIC mask section.

Definition at line 562 of file em_core.c .

References CORE_nvicMask_t::a , and CORE_CRITICAL_SECTION .