__inline void enable_IRQ(void)
{
 int tmp;
 __asm
 {
    MRS tmp, CPSR
    BIC tmp, tmp, #0x80
    MSR CPSR_c, tmp
 }
}
__inline void disable_IRQ(void)
{
int tmp;
  __asm
 {
   MRS tmp, CPSR
   ORR tmp, tmp, #0x80
   MSR CPSR_c, tmp
  }
}