source7279.h

本代码为一个相位控制器的源程序

//******************* 函数定义 *********************
void long_delay(void); //长延时
void short_delay(void); //短延时
void delay10ms(unsigned char); //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); //接收一个字节
void initial_7279(void);  //7279上电初始化


//************* 变量及I/O口定义 ******************
unsigned char key_number, j, k;
unsigned int tmr;

sbit cs=P1^3;  // cs at P1.4
sbit clk=P1^2; // clk连接于 P1.5
sbit dat=P1^0; // dat连接于 P1.2
sbit key=P1^1; // 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


//*********************7279子程序START*********************

void initial_7279()
{
 for (tmr=0;tmr<0x2000;tmr++);                 //上电延时
 send_byte(CMD_RESET);                         //复位HD7279A
 cs=1;
}

void write7279(unsigned char cmd, unsigned char dta)
{   send_byte (cmd);
    send_byte (dta);
cs=1;}

unsigned char read7279(unsigned char command)
{  send_byte(command);
cs=1;
return(receive_byte()); }

void send_byte( unsigned char out_byte)//发送一个命令字
{    unsigned char i;
clk=0;
cs=0;
short_delay();
for (i=0;i<8;i++)
{  clk=0;
if (out_byte&0x80){dat=1;}
else {dat=0;}
clk=1;
short_delay();
out_byte=out_byte*2; }
dat=1;}

unsigned char receive_byte(void) //接收一个命令字
{   unsigned char i, in_byte;
 cs=0;
    clk=0;
     dat=1; //设为输入状态
     short_delay();
for (i=0;i<8;i++)
{   clk=0;
in_byte=in_byte*2;
clk=1;
if (dat==1)
{ in_byte=in_byte|0x01;}
 }
dat=1;
//cs=1;
return (in_byte);}

//******************************7279子程序END**********************

//*****************************延时程序***************************

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

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

void delay10ms(unsigned char time)
{unsigned char i;
unsigned int j;
for(i=0;i<time;i++)
{  for(j=0;j<0x390;j++);
}
}

//*************************延时程序END*******************************