//****************电子园PIC16F877A开发板 数码管动态扫描实验**************** // // //mcu: PIC16F877A 4MHz //2010年12月22日9:36:29 //************************************************************************* #include <pic.h> #include "../head/config.h" __CONFIG(HS&WDTDIS&LVPDIS&PWRTEN); //HS振荡,禁止看门狗,低压编程关闭,启动延时定时器 #define srclk RC3 //移位寄存器时钟 (74595:11脚) #define rclk RC4 //存储寄存器时钟 (74595:12脚) #define ser RC5 //串行数据口 (74595:14脚) //oe:输出允许 L:允许输出;H:禁止输出; (74595:13脚) //srclr:移位寄存器清零 (L:清零) (74595:10脚) const uchar smg_text[]={0xbf,0xfe,0xfb,0xef,0xdf,0x7f,0xfd,0xf7,}; const uchar smg[]={0x0a,0xfa,0x8c,0xa8,0x78,0x29,0x09,0xba,0x08,0x28,0x00,}; // 0 1 2 3 4 5 6 7 8 9 all const uchar smg_bit[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0xff,}; uchar c; uchar d; //********************函数定义********************* void delay1ms(uint DelayTime); void senddata_74595(uchar SendData); //*************** 主程序 ******************** void main(void) { TRISC3=0; //srclk 引脚设为输出 TRISC5=0; //ser 引脚设为输出 TRISC4=0; //rclk 引脚设为输出 rclk=0; delay1ms(10); rclk=0; //产生锁存时钟 senddata_74595(0x00); senddata_74595(0x00); rclk=1; delay1ms(500); while(1) { for(c=0;c<10;c++) { for(d=0;d<30;d++) { rclk=0; senddata_74595(smg_bit[0]); senddata_74595(smg[c]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[1]); senddata_74595(smg[(c+1)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[2]); senddata_74595(smg[(c+2)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[3]); senddata_74595(smg[(c+3)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[4]); senddata_74595(smg[(c+4)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[5]); senddata_74595(smg[(c+5)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[6]); senddata_74595(smg[(c+6)%10]); rclk=1; delay1ms(1); rclk=0; senddata_74595(smg_bit[7]); senddata_74595(smg[(c+7)%10]); rclk=1; delay1ms(1); } } } } //***********************74595发送函数************************ void senddata_74595(uchar SendData) { uchar i; for(i=0;i<8;i++) { if((SendData&0x80)==0) //先发送高位,后发送低位 { ser=0; } else { ser=1; } srclk=0; srclk=1; SendData=SendData<<1; //数据左移一位 } } //*****************延时 n*1ms 12MHz***************** void delay1ms(uint DelayTime) { uint temp; for(;DelayTime>0;DelayTime--) { for(temp=0;temp<270;temp++) {;} } }