system_funcs.h File Reference

This header files contains kernel functions that help control system behvaior. More...

#include <stdint.h>

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Functions
void	systemENTER_CRITICAL ()
	Enter a critical section by disabling all interrupts.
void	systemEXIT_CRITICAL ()
	Exit a critical section by enabling all interrupts.

Detailed Description

This header files contains kernel functions that help control system behvaior.

Warning

Only low-level system components and startup code should include this file.

Definition in file system_funcs.h.

Function Documentation

systemENTER_CRITICAL()

void systemENTER_CRITICAL

(

)

Enter a critical section by disabling all interrupts.

Warning

This function should not be called by user code.

Definition at line 16 of file system_funcs.c.

{
  /* Mask priorities 0xE0 to 0xFF, which includes
   * SysTick_Handler and PendSV_Handler
   */
  __asm volatile ("MOV r0, #0xE0\n"
                  "MSR BASEPRI, r0\n"
                  "ISB\n");
}

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systemEXIT_CRITICAL()

void systemEXIT_CRITICAL

(

)

Exit a critical section by enabling all interrupts.

Warning

This function should not be called by user code.

Definition at line 32 of file system_funcs.c.

{
  __asm volatile ("MOV r0, #0x00\n"
                  "MSR BASEPRI, r0\n"
                  "ISB\n");
}

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