01_const_to_sfrb.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 20 行

/* { dg-options { -nostartfiles below100.o -Tbelow100.ld -O2 } } */
/* { dg-final { scan-assembler "mov.b 32532,#18" } } */

#define SFR (*((volatile unsigned char*)0x7f14))
unsigned char *p = (unsigned char *) 0x7f14;

void
Do (void)
{
  SFR = 0x12;
}

int
main (void)
{
  *p = 0x34;
  Do ();
  return (*p == 0x12) ? 0 : 1;
}