xgate中定义非中断函数问题

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hars19790220| 实习生

楼主 | 2015-5-19 08:38 | 只看该作者回帖奖励

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中断函数, XGATE, TI, volatile, AN

#include <hidef.h>    /* common defines and macros */
#include "xgate.h"
#include "MC9S12XEP100.h"
#pragma push
#pragma DATA_SEG SHARED_DATA  /* allocate the following variables in the segment SHARED_DATA */
extern volatile word NumOfSDBuff1;
extern volatile word NumOfSDBuff2;
extern volatile  word NumOfNetBuff1;
extern volatile  word NumOfNetBuff2;
extern volatile  byte DataValid;
extern volatile  byte BuffSelect;
extern volatile  byte SDBuff1[2048];
extern volatile  byte SDBuff2[2048];
extern volatile  byte NetBuff1[1024];
extern volatile  byte NetBuff2[1024];
#pragma pop

#pragma DATA_SEG DEFAULT
volatile static byte CurrentBuff;
volatile static byte AddTime;

static
byte geth4bit(byte candata) /* 取字节高4位转为对应字符*/
{
if((candata>>4 + 0x30) > 0x39) return (byte)(candata>>4 + 0x07);
return (byte)(candata>>4);
}
static
byte getl4bit(byte candata) /* 取字节低4位转为对应字符*/
{
  return ((candata&0x0F + 0x30)> 0x39) ? (candata>>4 + 0x07) : (candata&0x0F);
}

两个函数在编译时提示，返回值恒为0，这是怎么回事？

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