main.c

C32中C语言中嵌入汇编程序示例.包括中断程序中调用C参数

/*LED ioport address 810050h,810040h-81005fh*/
/*void c_int99();   /*声明中断处理函数*/  
/*volatile int *io_in=(volatile int*)0x810050;
                  /*定义LED接口地址指针*/     
/*volatile int *io_add=(volatile int*)0x808000;  
                  /*定义C32控制器表表首 */      

volatile int *intvec=(volatile int*)0x87fe00;

#define vec_addr  (volatile int)0x87fe00;    /*定义中断向量表表首*/

int send;                  

asm("ctrstr0 .word 0f10f8h");
asm("ctrstr1 .word 0010f8h");

void timer0();   

void timer1();

void DR0();  

void send8251();

main()
 {
 /*int i;*/
 /*for (i=0;i<=9;i++)*/
 send=0x55;  
 
 asm(" LDI 87feh,R0");   /*87feH送R0*/  
 asm(" LSH 16,R0");      /*左移16位，变成87fe0000*/
 asm(" LDI R0,IF");      /*87fe0000H送IF，定位中断向量表，并清除所有的中断标志*/ 
 asm(" AND 09h,IE");     /*timer interrupt disable*/
 asm(" OR 09h,IE");      /*int0,int3 interrupt enable*/
 asm(" OR 6000h,ST");    /*全局中断使能,边缘触发。GIE＝1*/ 

 asm(" ldp @800000h");      /*iostrb=00f8h,strb0=0f10f8h,srrb1=010f8h,*/
 asm(" ldi 00F8h,r1");
 asm(" sti r1,@8060h");
 asm(" ldi @ctrstr0,r1");
 asm(" sti r1,@8064h");
 asm(" ldi @ctrstr1,r1");
 asm(" sti r1,@8068h"); 
  
 asm(" LDP @900000h");      /*8251 initialize*/
 asm(" LDI 0eh,r0");
 asm(" sti r0,@0004h");
 asm(" ldi 14h,r0");
 asm(" sti r0,@0004h");
 
 

timer0();

timer1();
 
DR0(); 
 
send8251();
 
 
/*  while(1)
 {
 
 
    asm(" LDP @900000h");
    asm(" LDI 0aah,r1");
    asm(" STI r1,@01h");}  */
 
 
 
  while(1)
   {  
   asm(" LDI 02h,IOF");
   asm(" nop ");
   asm(" nop ");
   asm(" nop ");
   asm(" nop ");
   asm(" OR 06h,IOF");    
   }
}  

/*void c_int09()
 {
    *io_in=~(*io_in);  }  /*取反，LED闪烁*/

void c_int99()
 {
   /*空操作*/
 }