MSP430学习小记~~~~关于在IAR环境下使用MSP的中断。

只看该作者 · 2012-3-19 17:02

前段时间一直用CCS，但是机器太差（06 年的笔记本），启动一次CCS的调试需要近2分钟。。。。。:funk: 于是换IAR5.10,速度确实提升不少。。。。。

今天使用IAR新建的工程调试MSP430的IO中断程序。整个中断程序如下：

//#include "msp430.h"
//#include "io430.h"
#include "io430G2211.h"
#include "in430.h"
void delay()
{
  int i;
  for(i=0;i<6553;i++);
  for(i=0;i<6553;i++);
}
void blink(void)
{
         P2OUT = 0x00;
         delay();
   P2OUT = 0xFF;
         delay();
}
int main( void )
{
  // Stop watchdog timer to prevent time out reset

  WDTCTL = WDTPW + WDTHOLD;
  P2SEL = 0x00;                      // P1.0 = TACLK input, P1.7 = CAOUT
  P2DIR = 0xc0;

  P2OUT = 0x00;

  P1DIR = 0x00;
  P1SEL = 0x00;
  P1REN = 0x08;
  P1OUT = 0x08;

  P1IE  = 0xff; //interrupt enable
  P1IES = 0xff; //set the high to low interrupt the P1.3
  P1IFG=0;//CLEAR INTERRUPT AT P1.3
  _BIS_SR(LPM0_bits+GIE);

  //GIE = aa;;
while(1);
}

#pragma vector=PORT1_VECTOR
__interrupt void P1VECTOR(void)
{
  //if(P1IFG&0x08!=0)
// {
unsigned j=0;
while(j<30)
{
blink();
j++;
}
P1IFG=0;//CLEAR INTERRUPT AT P1.3
}

简单说来，该程序使用P1.3作为IO中断输入，当有按键触发中断时跳入到中断处理函数中，使LED灯闪烁30次。。。。

P1IE  = 0xff; //interrupt enable
  P1IES = 0xff; //set the high to low interrupt the P1.3
  P1IFG=0;//CLEAR INTERRUPT AT P1.3
  _BIS_SR(LPM0_bits+GIE); //open interrupt flag in SR reg.

最关键的也就是这4句话，前面三句表示的是打开对应的IO中断，最后一句是置SR寄存器中的GIE位，打开430的中断总开关。

也就是这句话出问题了，IAR弹出错误：

Error[e46]: Undefined external "_BIS_SR" referred in main ( F:\temp\iarbegin\Debug\Obj\main.r43 )

也就是说_BIS_SR没有定义。。。但是很多官方的例子里面都是使用_BIS_SR的啊！问题出在哪呢？？看到工程上部的4个头文件

//#include "msp430.h"
//#include "io430.h"
#include "io430G2211.h"
#include "in430.h"

IAR新建工程时，默认使用的头文件是IO430.h，当我们把这个头文件换成msp430.h上述错误就消失了，中断正常响应。。。
于是我们继续查找这两个头文件的不同，发现msp430.h中会包含IN430.H头文件，而IO430.H中没有包含IN430.H这个文件。打开IN430.H,哈哈，我们要找的东西全在里面，除了刚才说的_BIS_SR外，我们还可以使用_EINT()  等CCS中常用的函数了。。

#ifndef __IN430_H
#define __IN430_H
#ifndef _SYSTEM_BUILD
  #pragma system_include
#endif
#include "intrinsics.h"
#pragma language=save
#pragma language=extended

/*
* Deprecated intrinsic functions.
*/
#ifdef __cplusplus
extern "C"
{
#endif
  /* Deprecated, please use "__bis_SR_register" instead. (If the
* return value of this intrinsic is used, you can also use
* "__get_SR_register".) */
  __intrinsic unsigned short _BIS_SR(unsigned short);
  /* Deprecated, please use "__bic_SR_register" instead. (If the
* return value of this intrinsic is used, you can also use
* "__get_SR_register".) */
  __intrinsic unsigned short _BIC_SR(unsigned short);
  /* Deprecated, please use "__bis_SR_register_on_exit" instead. (If
* the return value of this intrinsic is used, you can also use
* "__get_SR_register".) */
  __intrinsic unsigned short _BIS_SR_IRQ(unsigned short);
  /* Deprecated, please use "__bic_SR_register_on_exit" instead. (If
* the return value of this intrinsic is used, you can also use
* "__get_SR_register".) */
  __intrinsic unsigned short _BIC_SR_IRQ(unsigned short);
  /* Deprecated, please use the #pragma directive "bis_nmi_ie1"
* instead. */
  __intrinsic unsigned short _BIS_NMI_IE1(unsigned short);
#ifdef __cplusplus
}
#endif

/*
* Convenience macros mapping old names to new.
*/
/* Deprecated, please use "__disable_interrupt" instead. */
#define _DINT()       __disable_interrupt()
/* Deprecated, please use "__enable_interrupt" instead. */
#define _EINT()       __enable_interrupt()
/* Deprecated, please use "__no_operation" instead. */
#define _NOP()       __no_operation()
/* Deprecated, please use "__op_code" instead. */
#define _OPC(x)       __op_code(x)
/* Deprecated, please use "__swap_bytes" instead. */
#define _SWAP_BYTES(x) __swap_bytes(x)

/* Deprecated, please use the keyword "__monitor" instead. */
#define monitor       __monitor
/* Deprecated, please use the keyword "__no_init" instead. */
#define no_init       __no_init
#pragma language=restore
#endif /* __IN430_H */