Global interrupt management

This is a driver for global enabling and disabling of interrupts.

Modules
	Deprecated interrupt definitions

Macros
#define	CONFIG_INTERRUPT_FORCE_INTC
	Force usage of the ASF INTC driver. More...

Functions
void	cpu_irq_enter_critical (void)
void	cpu_irq_leave_critical (void)

Variables
static volatile uint32_t	cpu_irq_critical_section_counter
static volatile bool	cpu_irq_prev_interrupt_state

Global interrupt flags
typedef uint32_t	irqflags_t
	Type used for holding state of interrupt flag. More...
static irqflags_t	cpu_irq_save (void)
	Get and clear the global interrupt flags. More...
static bool	cpu_irq_is_enabled_flags (irqflags_t flags)
	Check if interrupts are globally enabled in supplied flags. More...
static void	cpu_irq_restore (irqflags_t flags)
	Restore global interrupt flags. More...
#define	cpu_irq_enable()
	Enable interrupts globally. More...
#define	cpu_irq_disable()
	Disable interrupts globally. More...
#define	cpu_irq_is_enabled()   (__get_PRIMASK() == 0)
	Check if interrupts are globally enabled. More...

Interrupt Service Routine definition
#define	ISR(func)   void func (void)
	Define service routine. More...
#define	irq_initialize_vectors()
	Initialize interrupt vectors. More...
#define	irq_register_handler(int_num, int_prio)
	Register handler for interrupt. More...

#define CONFIG_INTERRUPT_FORCE_INTC

Force usage of the ASF INTC driver.

Predefine this symbol when preprocessing to force the use of the ASF INTC driver. This is useful to ensure compatibility across compilers and shall be used only when required by the application needs.

#define cpu_irq_disable

(

)

Value:

do {                                       \
        __disable_irq();                       \
        __DMB();                               \
        g_interrupt_enabled = false;           \
    } while (0)

Disable interrupts globally.

Referenced by cpu_irq_enter_critical(), cpu_irq_save(), system_interrupt_disable_global(), and USART_HOST_ISR_VECT().

#define cpu_irq_enable

(

)

Value:

do {                                       \
        g_interrupt_enabled = true;            \
        __DMB();                               \
        __enable_irq();                        \
    } while (0)

Enable interrupts globally.

Referenced by cpu_irq_leave_critical(), cpu_irq_restore(), main(), system_interrupt_enable_global(), and USART_HOST_ISR_VECT().

#define cpu_irq_is_enabled

(

)

(__get_PRIMASK() == 0)

Check if interrupts are globally enabled.

Returns

True if interrupts are enabled.

Referenced by cpu_irq_enter_critical(), cpu_irq_save(), and system_interrupt_is_global_enabled().

#define irq_initialize_vectors

(

)

Value:

do {                             \
    } while(0)

Initialize interrupt vectors.

For NVIC the interrupt vectors are put in vector table. So nothing to do to initialize them, except defined the vector function with right name.

This must be called prior to irq_register_handler.

Referenced by main().

#define irq_register_handler	(		int_num,
			int_prio
	)

Value:

NVIC_ClearPendingIRQ(    (IRQn_Type)int_num);                      \
    NVIC_SetPriority(    (IRQn_Type)int_num, int_prio);                \
    NVIC_EnableIRQ(      (IRQn_Type)int_num);                          \

Register handler for interrupt.

For NVIC the interrupt vectors are put in vector table. So nothing to do to register them, except defined the vector function with right name.

Usage:

irq_initialize_vectors();
irq_register_handler(foo_irq_handler);

Note

The function func must be defined with the ISR macro.

The functions prototypes can be found in the device exception header files (exceptions.h).

#define ISR

(

func

)

void func (void)

Define service routine.

Note

For NVIC devices the interrupt service routines are predefined to add to vector table in binary generation, so there is no service register at run time. The routine collections are in exceptions.h.

Usage:

ISR(foo_irq_handler)
{
     // Function definition
     ...
}

Parameters

func	Name for the function.

irqflags_t

Type used for holding state of interrupt flag.

void cpu_irq_enter_critical

(

void

)

References cpu_irq_critical_section_counter, cpu_irq_disable, cpu_irq_is_enabled, and cpu_irq_prev_interrupt_state.

Referenced by system_interrupt_enter_critical_section().

bool cpu_irq_is_enabled_flags ( irqflags_t  flags )

inlinestatic

Check if interrupts are globally enabled in supplied flags.

Parameters

flags

Currents state of interrupt flags.

Returns

True if interrupts are enabled.

Referenced by cpu_irq_restore().

void cpu_irq_leave_critical

(

void

)

References Assert, cpu_irq_critical_section_counter, cpu_irq_enable, and cpu_irq_prev_interrupt_state.

Referenced by system_interrupt_leave_critical_section().

void cpu_irq_restore ( irqflags_t  flags )

inlinestatic

Restore global interrupt flags.

Use in conjunction with cpu_irq_save.

Parameters

flags

State to set interrupt flag to.

References cpu_irq_enable, and cpu_irq_is_enabled_flags().

Referenced by prog_ocr(), restore_cpu_interrupt(), start_absolute_timer(), sw_timer_service(), and sw_timer_stop().

irqflags_t cpu_irq_save ( void  )

inlinestatic

Get and clear the global interrupt flags.

Use in conjunction with cpu_irq_restore.

Returns

Current state of interrupt flags.

Note

This function leaves interrupts disabled.

References cpu_irq_disable, and cpu_irq_is_enabled.

Referenced by prog_ocr(), save_cpu_interrupt(), start_absolute_timer(), sw_timer_service(), and sw_timer_stop().

volatile uint32_t cpu_irq_critical_section_counter

static

Referenced by cpu_irq_enter_critical(), and cpu_irq_leave_critical().

volatile bool cpu_irq_prev_interrupt_state

static

Referenced by cpu_irq_enter_critical(), and cpu_irq_leave_critical().