2023年01月13日 | 用C语言写一个驱动数码管程序

/****** 本程序功能说明 *****用STC的MCU的IO方式控制74HC595驱动8位数码管。显示效果为: 数码时钟。使用Timer0的16位自动重装来产生1ms节拍,程序运行于这个节拍下, 用户修改MCU主时钟频率时,自动定时于1ms.*****/

#define MAIN_Fosc 22118400L //定义主时钟

#include "STC15Fxxxx.H"

#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中断频率, 1000次/秒

#define DIS_DOT 0x20

#define DIS_BLACK 0x10

#define DIS_ 0x11

u8 code t_display[]={ //标准字库

// 0 1 2 3 4 5 6 7 8 9 A B C D E F

0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,

//black - H J K L N o P U t G Q r M y

0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,

0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46}; //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

u8 code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; //位码

sbit P_HC595_SER = P4^0; //pin 14 SER data input

sbit P_HC595_RCLK = P5^4; //pin 12 RCLk store (latch) clock

sbit P_HC595_SRCLK = P4^3; //pin 11 SRCLK Shift data clock

u8 LED8[8]; //显示缓冲

u8 display_index; //显示位索引

bit B_1ms; //1ms标志

u8 hour,minute,second;

u16 msecond;

/******* 显示时钟函数 ********/

void DisplayRTC(void)

{

if(hour >= 10) LED8[0] = hour / 10;

else LED8[0] = DIS_BLACK;

LED8[1] = hour % 10;

LED8[2] = DIS_;

LED8[3] = minute / 10;

LED8[4] = minute % 10;

LED8[5] = DIS_;

LED8[6] = second / 10;

LED8[7] = second % 10;

}

/***** RTC演示函数 *****/

void RTC(void)

{

if(++second >= 60)

{

second = 0;

if(++minute >= 60)

{

minute = 0;

if(++hour >= 24) hour = 0;

}

}

}

/**** 主函数 *******/

void main(void)

{

u8 i,k;

P0M1 = 0; P0M0 = 0; //设置为准双向口

P1M1 = 0; P1M0 = 0; //设置为准双向口

P2M1 = 0; P2M0 = 0; //设置为准双向口

P3M1 = 0; P3M0 = 0; //设置为准双向口

P4M1 = 0; P4M0 = 0; //设置为准双向口

P5M1 = 0; P5M0 = 0; //设置为准双向口

P6M1 = 0; P6M0 = 0; //设置为准双向口

P7M1 = 0; P7M0 = 0; //设置为准双向口

AUXR = 0x80; //Timer0 set as 1T, 16 bits timer auto-reload,

TH0 = (u8)(Timer0_Reload / 256);

TL0 = (u8)(Timer0_Reload % 256);

ET0 = 1; //Timer0 interrupt enable

TR0 = 1; //Tiner0 run

EA = 1; //打开总中断

display_index = 0;

hour = 11; //初始化时间值

minute = 59;

second = 58;

RTC();

DisplayRTC();

// for(i=0; i<8; i++) LED8[i] = DIS_BLACK; //上电消隐

for(i=0; i<8; i++) LED8[i] = i; //显示01234567

k = 0;

while(1)

{

if(B_1ms) //1ms到

{

B_1ms = 0;

if(++msecond >= 1000) //1秒到

{

msecond = 0;

RTC();

DisplayRTC();

}

}

}

}

/*** 向HC595发送一个字节函数 *******/

void Send_595(u8 dat)

{

u8 i;

for(i=0; i<8; i++)

{

dat <<= 1;

P_HC595_SER = CY;

P_HC595_SRCLK = 1;

P_HC595_SRCLK = 0;

}

}

/******** 显示扫描函数 **********/

void DisplayScan(void)

{

Send_595(~T_COM[display_index]); //输出位码

Send_595(t_display[LED8[display_index]]); //输出段码

P_HC595_RCLK = 1;

P_HC595_RCLK = 0; //锁存输出数据

if(++display_index >= 8) display_index = 0; //8位结束回0

}

/***** Timer0 1ms中断函数 ********/

void timer0 (void) interrupt TIMER0_VECTOR

{

DisplayScan(); //1ms扫描显示一位

B_1ms = 1; //1ms标志

}