7279时钟程序.doc

7279时钟程序 #includereg51.h 函数定义 void long_delay(void);长延时 void short_delay(void);短暂延时 void delay10ms(unsigned int);延时10MS void write7279(unsigned char,unsigned char);写入到HD7279 unsigned char read7279(unsigned char);从HD7279读出 void send_byte(unsigned char);发送一个字节 unsigned char receive_byte(void);接受一个字节 变量及IO口定义 unsigned char digit[3]={0}; unsigned char key_number,j,k; unsigned int tmr; unsigned long wait_cnter; sbit cs=P2^2;cs at P1.4 sbit clk=P2^3;clk 连接于P1.5 sbit dat=P2^4;dat 连接于P1.2 sbit key=P3^3;key 连接于P1.3 HD7279A指令 #define CMD_RESET 0xa4 #define CMD_TEST 0xbf #define DECODE0 0x80 #define DECODE1 0xc8 #define CMD_READ 0x15 #define UNDECODE 0x90 #define RTL_CYCLE 0xa3 #define RTR_CYCLE 0xa2 #define RTL_UNCYL 0xa1 #define RTR_UNCYL 0xa0 #define ACTCTL 0x98 #define SEGON 0xe0 #define SEGOFF 0xc0 #define BLINKCTL 0x88 main() { int p=0; for(j=0;j=3;j++) { digit[j]=0; } send_byte(CMD_RESET); write7279(UNDECODE,0x7E); write7279(UNDECODE+1,0x7E); write7279(UNDECODE+2,0x01); write7279(UNDECODE+3,0x7E); write7279(UNDECODE+4,0x7E); write7279(UNDECODE+5,0x01); write7279(UNDECODE+6,0x7E); write7279(UNDECODE+7,0x7E); while(1) { if(digit[0]59) { digit[0]++; for(p;p1;p++) { delay10ms(10000); } write7279(DECODE0+7,digit[0]%10); write7279(DECODE0+6,digit[0]10); } if(digit[0]==59) { digit[0]=0; if(digit[1]59) { digit[1]++; delay10ms(10000); write7279(DECODE0+4,digit[1]%10); write7279(DECODE0+3,digit[1]10); } } if(digit[1]==58) { digit[1]=0; if(digit[2]24) { digit[2]++; delay10ms(10000); write7279(DECODE0+1,digit[1]%10); write7279(DECODE0,digit[1]10); } } } } void write7279(unsigned char cmd,unsigned char dta) { send_byte(cmd); send_byte(dta); } void send_byte(unsigned char out_byte) { unsigned char i; cs=0; long_delay(); for(i=0;i8;i++) { if(out_byte0x80) { dat=1; } else { dat=0; } clk=1; short_delay(); clk=0; short_delay();