system_funcs.c

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#include "system_funcs.h"

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

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