SPI初始化程序

//SPI初始化子程序，用于数码管显示void spi_intial(){SpiaRegs.SPICCR.all =0x0047; // 使SPI处于复位方式, 下降沿, 八位数据SpiaRegs.SPICTL.all =0x0006; //主控模式,般时钟模式,使能talk,闭SPI中断SpiaRegs.SPIBRR =0x007F; //配置波特率SpiaRegs.SPICCR.all =SpiaRegs.SPICCR.all|0x0080; // 退出复位状态EALLOW;GpioMuxRegs.GPFMUX.all=0x000F;// 设置通用引脚为SPI引脚EDIS;}//IO初始化子程序void gpio_init(){EALLOW;GpioMuxRegs.GPAMUX.bit.TDIRA_GPIOA11=0; //GPIOA11设置为一般I/O口GpioMuxRegs.GPADIR.bit.GPIOA11=1; //把GPIOA11设置为输出//将GPIOE0~GPIOE2配置为一般I/O口输出,作138译码GpioMuxRegs.GPEMUX.all = GpioMuxRegs.GPEMUX.all&0xfff8; GpioMuxRegs.GPEDIR.all = GpioMuxRegs.GPEDIR.all|0x0007;//将GPIOB8~GPIOB15配置为一般I/O口,D0~D7GpioMuxRegs.GPBMUX.all = GpioMuxRegs.GPBMUX.all&0x00ff;EDIS;GpioDataRegs.GPADAT.bit.GPIOA11=0; //GPIOA11=0;该端口为74HC595锁存信号}//键扫描子程序K1~K8int Keyscan1(void){EALLOW;//将GPIOB8~GPIOB15配置为输入,D0~D7GpioMuxRegs.GPBDIR.all = GpioMuxRegs.GPBDIR.all&0x00ff;EDIS;GpioDataRegs.GPEDAT.all = 0xfff8; //选通KEY低8位for (i=0; i<100; i++){} //延时//判K1~K8是否按下if ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff){for (i=0; i<30000; i++){} //延时消抖if ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff){KeyReg1=GpioDataRegs.GPBDAT.all ; //读键值while ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff) //判K1~K8是否松开{GpioDataRegs.GPDDAT.bit.GPIOD1 = !GpioDataRegs.GPDDAT.bit.GPIOD1;for (i=0; i<1000; i++){}}return (1);}}return (0);}//键扫描子程序K9~K16int Keyscan2(void){EALLOW;//将GPIOB8~GPIOB15配置为输入,D0~D7GpioMuxRegs.GPBDIR.all = GpioMuxRegs.GPBDIR.all&0x00ff;EDIS;GpioDataRegs.GPEDAT.all = 0xfff9; //选通KEY高8位for (i=0; i<100; i++){} //延时//判K8~K16是否按下if ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff){for (i=0; i<30000; i++){} //延时消抖if ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff){KeyReg2=GpioDataRegs.GPBDAT.all ; //读键值while ((GpioDataRegs.GPBDAT.all|0x00ff)!=0xffff) //判K8~K16是否松开{GpioDataRegs.GPDDAT.bit.GPIOD1 = !GpioDataRegs.GPDDAT.bit.GPIOD1; for (i=0; i<1000; i++){}}return (1);}}return (0);}//按键记录次数，显示在16个LED上void LedOut(Uint16 led){EALLOW;//将GPIOB8~GPIOB15配置为输出,D0~D7GpioMuxRegs.GPBDIR.all = GpioMuxRegs.GPBDIR.all|0xff00;EDIS;GpioDataRegs.GPEDAT.all = 0xfffb; //LEDB选通GpioDataRegs.GPBDAT.all = ~led; //显示高8位for (i=0; i<100; i++){} //延时GpioDataRegs.GPEDAT.all = 0xffff; //锁存高8位GpioDataRegs.GPEDAT.all = 0xfffa; //LEDA选通GpioDataRegs.GPBDAT.all = ~(led<<8); //显示低8位for (i=0; i<100; i++){}GpioDataRegs.GPEDAT.all = 0xffff; //锁存低8位}//键散转子程序K1~K8void KeyFunction1(unsigned int KeyReg1){switch(KeyReg1){case K1: {LEDReg= 0x00; //键号0}break;case K2: {LEDReg= 0x01; //键号1}break;case K3: {LEDReg= 0x02; //键号2}break;case K4: {LEDReg= 0x03; //键号3}break;case K5: {LEDReg= 0x04; //键号4}break;case K6: {LEDReg= 0x05; //键号5}break;case K7: {LEDReg= 0x06; //键号6}break;case K8: {LEDReg= 0x07; //键号7}break;default:break;}}//键散转子程序K9~K16void KeyFunction2(unsigned int KeyReg2) {switch(KeyReg2){case K9: {LEDReg= 0x08; //键号8}break;case K10: {LEDReg= 0x09; //键号9}break;case K11: {LEDReg= 0x0A; //键号A}break;case K12: {LEDReg= 0x0B; //键号B}break;case K13: {LEDReg= 0x0C; //键号C}break;case K14: {LEDReg= 0x0D; //键号D}break;case K15: {LEDReg= 0x0E; //键号E}break;case K16: {LEDReg= 0x0F; //键号F}break;default:break;}}void display (LEDReg) //显示子程序{GpioDataRegs.GPADAT.bit.GPIOA11=0; //给LACK信号一个低电平SpiaRegs.SPITXBUF =LEDCode[LEDReg]; //给数码管送数while(SpiaRegs.SPISTS.bit.INT_FLAG != 1){}SpiaRegs.SPIRXBUF = SpiaRegs.SPIRXBUF;GpioDataRegs.GPADAT.bit.GPIOA11=1; //给LACK信号一个高电平为锁存74HC595 for(i=0;i<10;i++){} //延时}void main(void){Uint16 keyNum = 0x0000; //按键次数初始化InitSysCtrl(); // 系统初始化程序，该子程序存放在DSP281x_sysctrl.c中DINT; //关闭总中断spi_intial(); //SPI初始化子程序gpio_init(); // I/O初始化子程序IER = 0x0000; // 关闭外围中断IFR = 0x0000; // 清中断标志LedOut(keyNum); // LED指示灯初始化for(i=0;i<8;i++)// 8个数码管清0{SpiaRegs.SPITXBUF =LEDCode[0]; //给数码管送数while(SpiaRegs.SPISTS.bit.INT_FLAG != 1){}SpiaRegs.SPIRXBUF = SpiaRegs.SPIRXBUF;}GpioDataRegs.GPADAT.bit.GPIOA11=1; //给LACK信号一个高电平为锁存74HC595 for(i=0;i<10;i++){}while (1){if (Keyscan1() == 1) // 调用键扫描K1~K8子程序{keyNum=keyNum+1; // 按键记数KeyFunction1(KeyReg1);display (LEDReg); //显示键值LedOut(keyNum); //显示按键次数}if (Keyscan2() == 1) // 调用键扫描K8~K16子程序{keyNum=keyNum+1;KeyFunction2(KeyReg2);display (LEDReg); //显示键值LedOut(keyNum); //显示按键次数}}}。