comm_try.c

是用于开关磁阻电机的位置伺服控制的C语言源代码,基于CCS的开发环境.希望可以对你有所帮助.

/************************************/
/* down level DSP communication */ 
/************************************/
#include "c240.h" 
unsigned int TX_data,RX_data;  
void dsp_setup() 
{
 unsigned int temp;
 /*********************************************/
 /* Disable watchdog timer */
 /*********************************************/
 temp = WDCR;
 temp = temp|0x68;
 WDCR = temp;
 /*********************************************/
 /* initialize PLL module (20 MHz XTAL1) */
 /*********************************************/
 CKCR1 = 0x60;      	             /* crystal=20MHz CPUCLK = 20MHz */
                    	             /* and 1x PLL mult ratio */
 CKCR0 = 0xc3;      	             /* low–power mode 0, */
                    	             /* ACLK enabled, */
                                 	 /* PLL enabled, */
                    	             /* SYSCLK=CPUCLK/2 */
 SYSCR = 0x40c0;  
 
}
 
/*****************************/
 
/*初始化SCI*/
void SCI_init() 
{SCICCR=0x0017;                 /* 1 stop bit,no odd check,8 data bits，
                                   asynchronism mode,idle line */
 SCICTL1=0x0013;                /* inner clock，enable recive and transmit，disable 
                                   receive erro int ,sleep and woke */
 SCICTL2=0x0002;                /* enable recive int and disable transmit int */
 SCILBAUD=0x0000; 
 SCILBAUD=0x0082;               /* Baud rate=9600 kbps */
 SCIPC2=0x0022;                 /* enable recive port and transmit port */
 SCICTL1=0x0033;                /* let SCI return from reset state */ 
 SCIPRI=0x0000;                 /* RX int is high-priority int */ 
 } 
void disable_interrupts()
{
 asm(" SETC INTM");
}  
void enable_interrupts() 
{
 IFR  = 0xffff;                      /* Clear pending interrupts */ 
 IMR  = 0x0001 ;                      /* Enable CPU Interrupts:INT 1 */ 
 asm(" CLRC INTM");                  /* Global interrupt enable */
} 
void c_int1()
{   unsigned int y1,y2,y3;
	unsigned int x3,x4; 
	IFR=0x0001 ;
	y1=SYSIVR; 
	if (y1==0x0006)                  /* have a RX int */ 
	{ 
	  y2=SCIRXST; 	           
	  if (y2&0x80)              /* receive wrongly */  
	   { SCI_init();
	     y3=SCIRXST;
	            
	    } 
	  else 
	   {x3=SCIRXST;      
	     if (x3&0x40)                /* when RXREADY=1 read SCIRXBUF */      
	     {x4=SCIRXEMU;
	      x3=x3&0x0000;
	       TX_data='a';
      SCITXBUF=TX_data;}   
	     } 
	 } 
}
                
main ()
{unsigned int x1,x2,x5;  
 int i,k;
 char x;
 disable_interrupts();
 dsp_setup();
 SCI_init(); 
 enable_interrupts();
  for(;;)
   {
    for (;SCICTL2&0x80==0;);
    if (SCICTL2&0x80)
     {k=k+1;
      TX_data='m';
      SCITXBUF=TX_data;
      x1= SCITXBUF; }
    for (;SCIRXST&0x40==0;);            /* ready to receive data */          
    if (SCIRXST&0x40)                     
     x2=SCIRXEMU; 
     x=SCIRXBUF;                        /* when RXREADY=1 read SCIRXBUF */         
    }                           
     
}