int254.c

基于dsp5416d 外部中断实验

/*
;***********************************************************************
;*				  						 北京达盛科技有限公司
;*                                     	    研    发    部
;*
;*                                 	http://www.techshine.com
;*
;*--------------------------------------------- 文件信息 ---------------                                      
;*
;* 文件名称 : INT254.C	
;* 文件功能 : 该文件为测试外部中断2的测试程序,CPU=TMS320VC5402
;* 接口说明： NE555产生_|-|_正脉冲-----CPLD----反向-----VC5402的XINT2  
*/
//------------------头文件--------------------------------------

#include "DspRegDefine.h"   //VC5402 寄存器定义
//---------------------------------------------------------------
/*    ****************** 宏定义 ***************
************************************************************
*/

#define UCHAR  				unsigned char
#define UINT16 				unsigned int
#define UINT32 				unsigned long

#define TRUE     			1
#define FALSE    			0

//---------------------------------------------------------------

//---------------------------------------------------------
/*   端口定义 */
//---------------------------------------------------------
ioport UINT16 port8001;       //定义输出io端口为0x8001;
//----------------------------------------------------------
/*   全局变量定义 */
//---------------------------------------------------------

UINT16  show = 0x000f;                           
/*
**********************************************************************
          *************** 所使用的函数原型 *****************
**********************************************************************
*/

void cpu_init(void); //初始化CPU

void Delay(UINT16 numbers);       //延迟

void xint2_init(void);            //外部中断2初始化子程序

interrupt void ExtInt2();        //中断2中断子程序


//-------------------------------------------------------------------
/*
************************************************************************
			*********************** 函数定义 ******************
************************************************************************
*/

//--------------------------------------------------------------------
// 函数名称 : void cpu_init(void)
// 函数说明 : 初始化CPU
// 输入参数 : 无
// 输出参数 : 无
//--------------------------------------------------------------------
void cpu_init(void)

{

	asm(" nop ");
	asm(" nop ");
	asm(" nop ");
//-------------------------------------------------------------------	
//CLKMD DEFINITIONS:	
//    PLLMUL (bit 15-12) - 0000             PLL multiplier = 0 (mult by 1)
//    PLLDIV (bit 11)    -     0            PLL divider = 0 (div by 1)
//    PLLCOUNT (bit 10-3)-      11111111    PLL counter set to max
//    PLLONOFF (bit 2)   -              1   PLL on
//    PLLNDIV (bit 1)    -               1  Select PLL mode
//    PLLSTATUS (bit 1)  -                x PLL Status (read only)
//    ------------------
//                          0000011111111111 = 0x07ff CLKMD=1 X CLKIN
//--------------------------------------------------------------------	
   *(unsigned int*)CLKMD=0x0;         //switch to DIV mode clkout= 1/2 clkin
     while(((*(unsigned int*)CLKMD)&01)!=0);
   *(unsigned int*)CLKMD=0x07ff;      //switch to PLL X 1 mode
   
//--------------------------------------------------------------------
// ST0  DEFINITIONS:
//  ARP  (bit 15-13) - 000              Auxiliary register pointer
//  TC   (bit 12)    -    1             Test/control flag
//  C    (bit 11)    -     1            Carry is set to 1 if the result of an addition generates a carry; it is cleared to 0 if the
//                                     result of a subtraction generates a borrow.
//  OVA  (bit 10)    -      0           Overflow flag for accumulator A
//  OVB  (bit 9)     -       0          Overflow flag for accumulator B
//  DP   (bit 8-0)   -        00000000  Data-memory page pointer
//    --------------------
//                          0001 1000 0000 0000 =0x1800 Reset value
//--------------------------------------------------------------------
//   *(unsigned int*)ST0=0x1800; 
//--------------------------------------------------------------------
// ST1  DEFINITIONS:
//  BRAF  (bit 15)  - 0                 Block-repeat active flag     
//  CPL   (bit 14)  -  1                Compiler mode   CPL=0 DP;CPL=1 SP
//  XF    (bit 13)  -   1               XF status
//  HM    (bit 12)  -    0              Hold mode
//  INTM  (bit 11)  -     1             Interrupt mode INTM=0,All unmasked interrupts are enabled
//  Reser (bit 10)  -      0            Always read as 0
//  OVM   (bit 9)   -       0           Overflow mode
//  SXM   (bit 8)   -        1          Sign-extension mode
//  C16   (bit 7)   -         0         Dual 16-Bit/double-precision arithmetic mode
//  FRCT  (bit 6)   -          0        Fractional mode
//  CMPT  (bit 5)   -           0       Compatibility mode
//  ASM   (bit 4-0) -            00000  Accumulator shift mode
//    --------------------
//                          0110 1001 0000 0000 =0x2900 Reset value
//--------------------------------------------------------------------
//   *(unsigned int*)ST1=0x6900;
//--------------------------------------------------------------------  
 
//IPTR DEFINITIONS