text1.c

HD7279

#include <reg51.h>

//*** oˉêy?¨ò? ***
void long_delay(void);						  //延时程序1
void short_delay(void);							// ?ì?Y?óê±
void delay10ms(unsigned char);					// ?óê±10MS
void write7279(unsigned char, unsigned char);	// 写入到HD7279
unsigned char read7279(unsigned char);			// 从7279读出
void send_byte(unsigned char);					// 写入一个字节
unsigned char receive_byte(void);				//读出一个字节

//*** ±?á??°I/O?ú?¨ò? ***
unsigned char digit[5];
unsigned char key_number, j, k;
unsigned int tmr;
unsigned long wait_cnter;
//****************************
sbit cs=P1^5;					// 6cs at P1.4
sbit clk=P1^6;					// 7clk á??óóú P1.5
sbit dat=P1^7;					// 8dat á??óóú P1.2
sbit key=P1^4;					// 9key á??óóú 
//****** HD7279A ??á? ******
#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

//*** ?÷3ìDò ***
main()
{
	while (1)
	{
		for (tmr=0;tmr<0x2000;tmr++);   	//上电延时
		send_byte(CMD_RESET);				//复位HD7279
		
//******************************************
//              2aê???á??Yê?
//******************************************
		send_byte(CMD_TEST);				//测试指令
		for (j=0;j<3;j++)					//延时约3秒
		{
			delay10ms(100);
		}
		send_byte(CMD_RESET);				//清除显示
      write7279(144,1);   //第一位G亮
      write7279(144,2);   //第一位F亮
      write7279(144,4);   //第一位E亮
	}
}
	
void write7279(unsigned char cmd, unsigned char dta)
{
	send_byte (cmd);
	send_byte (dta);
}	

unsigned char read7279(unsigned char command)
{
	send_byte(command);
	return(receive_byte());
}

void send_byte(	unsigned char out_byte)
{
	unsigned char i;
	cs=0;
	long_delay();
	for (i=0;i<8;i++)
	{
		if (out_byte&0x80)
		{	
			dat=1;
		}
		else
		{
			dat=0;
		}
		clk=1;
		short_delay();
		clk=0;
		short_delay();
		out_byte=out_byte*2;
	}
	dat=0;
}

unsigned char receive_byte(void)
{
	unsigned char i, in_byte;
	dat=1;				// set to input mode
	long_delay();
	for (i=0;i<8;i++)
	{
		clk=1;
		short_delay();
		in_byte=in_byte*2;
		if (dat)
		{
			in_byte=in_byte|0x01;
		}
		clk=0;
		short_delay();
	}
	dat=0;
	return (in_byte);
}

void long_delay(void)
{
	unsigned char i;
	for (i=0;i<0x30;i++);
}

void short_delay(void)
{
	unsigned char i;
	for (i=0;i<8;i++);
}

// ************************* ?óê± n*10ms *************************
void delay10ms(unsigned char time)
{
	unsigned char i;
	unsigned int j;
	for (i=0;i<time;i++)
	{
		for(j=0;j<0x390;j++)
		{
		}
	}
}