SPI.zip_DSP spi

/*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; }