shumaguan.rar_msp430数码管_shumaguan

#include <msp430x14x.h> #define uchar unsigned char #define uint unsigned int #define led BIT7 const uchar segment[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; void int_clk() { uchar i; BCSCTL1&=~XT2OFF; //打开XT振荡器 BCSCTL2|=SELM1+SELS;//MCLK 8M and SMCLK 1M do { IFG1 &= ~OFIFG; //清除振荡错误标志 for(i = 0; i < 100; i++) _NOP(); //延时等待 } while ((IFG1 & OFIFG) != 0); //如果标志为1继续循环等待 IFG1&=~OFIFG; } void int_spi() { U0CTL|=SWRST; U0CTL|=CHAR+SYNC+MM; U0TCTL|=SSEL1+SSEL0+STC; //3 BIT AND SMCLK AS SPI CLOCK U0TCTL|=CKPH; U0TCTL&=~CKPL; //CKPL CKPH:01 上升沿写数据 U0BR0=0X02; U0BR1=0X00; U0MCTL=0X00; ME1|=USPIE0; //使能SPI U0CTL&=~SWRST; IE1&=~UTXIE0; IE1&=~URXIE0; //禁止中断 P3SEL|=0x0E; P3DIR|=BIT2+BIT4; //选择第二功能和I/O方向 } write_byte(uchar byte) { U0TXBUF=byte; while((IFG1&UTXIFG0)==0);//UTXIFG0=0，表示数据从发送 IFG1&=~UTXIFG0; } display(uchar data) { P2DIR|=led; P2OUT|=led;//使能164CLK write_byte(segment[data]);//写数据 P2OUT&=~led; //禁止164CLK } delay() { uint i,j; for(i=0;i<=1000;i++) { for(j=0;j<=1000;j++) ; } } int main( void ) { uchar i; WDTCTL=WDTPW+WDTHOLD;//关闭看门狗 int_clk();//初始化时钟 int_spi(); //初始化SPI while(1) { for(i=0;i<=9;i++) { delay(); display(i);//循环显示0-9 } } }