main.c

TMS320LF2407的SPI控制程序

/*Main.c*/ 
/*SPI-TLC5620 DA转换程序*/
#include "global.c" 
#define	  	SetCS		PEDATDIR = PEDATDIR | 0x40
#define	  	ClrCS		PEDATDIR = PEDATDIR & 0xFFBF

void SystemInit();
void Timer1Init(); 
void KickDog();  
void SPI_Init(); 
const	unsigned int	LedCode[]={0xC0C0,0xF9F9,0xA4A4,0xB0B0,0x9999,0x9292,0x8282,0xF8F8,0x8080,0x9090,0x8888,0x8383,0xC6C6,0xA1A1,0x8686,0x8E8E,0xFFFF};
//const	unsigned char	LedCode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF};

int numled0=200;   
int LedCount = 0;


main()
{  

   SystemInit();         		//系统初始化
   MCRC=MCRC & 0xFF00; 	    //IOPE0-7设为IO口模式
   PEDATDIR=0xFF00;   	    //所有LED=0, 
   SPI_Init();      
   Timer1Init();          	/*定时器初始化*/
   asm(" CLRC INTM ");
   while(1);
   
}


void SystemInit() 
{  
 
	asm(" SETC	INTM ");	/* 关闭总中断 */
	asm(" CLRC  SXM  ");	/* 禁止符号位扩展 */ 
	asm(" CLRC  CNF  ");    /* B0块映射为 on-chip DARAM*/
	asm(" CLRC  OVM  ");    /* 累加器结果正常溢出*/
	SCSR1=0x87FE;         	/* 系统时钟CLKOUT=20*2=40M */
	   						/* 打开ADC,EVA,EVB,CAN和SCI的时钟*/
	WDCR=0x006F;			/* 禁止看门狗,看门狗时钟64分频 */ 
	KickDog();    			/* 初始化看门狗 */  
    IFR=0xFFFF;				/* 清除中断标志 */
    IMR=0x0003;				/* 打开中断2*/      
    
}  

void Timer1Init()           
{ 

    EVAIMRA=0x0080;			//  定时器1周期中断使能 
    EVAIFRA=0xFFFF;			//  清除中断标志 
    GPTCONA=0x0000;
	T1PR=2500;				//  定时器1初值,定时0.4us*2500=1ms 			
	T1CNT=0;
	T1CON=0x144E;           //增模式, TPS系数40M/16=2.5M,T1使能
				
} 

void SPI_Init()             //SPI-DA初始化
{
    MCRB=MCRB | 0x0014;     //SPISIMO,SPICLK特殊功能方式 
	SetCS;
    SPICCR=0x004F;          //8bit数据
    SPICTL=0x0006;          //禁止中断
    SPIBRR=0x0027;          //1M波特率,40M/40=1M
    SPICCR=SPICCR | 0x80;   

}

void c_int2()               /*定时器1中断服务程序*/
{
    unsigned char flag=0;
    unsigned char i;
			
    if(PIVR!=0x27)
		{  	asm(" CLRC INTM ");
			return;
		}
	T1CNT=0; 
	
	numled0--;
	if(numled0==0)
	{
		numled0=200;
		if((PEDATDIR & 0x0002)==0x0002) 
			PEDATDIR=PEDATDIR & 0xFFE0;    	//LED灭  
		else
			PEDATDIR=PEDATDIR |0x001F;     	//LED亮 

		SPITXBUF = LedCode[LedCount];
    	while(1)
    	{
    		flag=SPISTS & 0x40;
    		if(flag==0x40)     break;
    	}
    	SPIRXBUF=SPIRXBUF;/*虚读寄存器以清除中断标志*/      
		ClrCS;
		SetCS;
		LedCount++;
   		if (LedCount>15)   LedCount = 0;
	}

    
	EVAIFRA=0x80; 
	asm(" CLRC	INTM ");   
	
}  

void KickDog()					/*踢除看门狗 */
{
	WDKEY=0x5555;
	WDKEY=0xAAAA;
}