7279c.c

2051控制7279转换+led输出

//用于MCS51的C语言例子程序
//这是用于7279A评估板的C51子程序
#include<reg51.h>
#include<absacc.h>
#define uchar unsigned char
#define uint  unsigned int  

//***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

//**定义变量及I/O口**

unsigned char digit[5];

unsigned char key_number, j, k;



unsigned int tmr;



unsigned long wait_cnter;

sbit cs=P1^3; // cs at P1.0
sbit clk=P1^2; // clk 连接于P1.1
sbit dat=P1^1; // data 连接于P1.2
sbit key=P3^2; // key 连接于P1.3

 //****** HD7279A指令 ******
#define CMD_RESET 0xa4  //复位（清除）指令
#define CMD_TEST 0xbf   //测试指令
#define RTL_CYCLE 0xa3  //循环左移指令
#define RTR_CYCLE 0xa2	//循环右移指令
#define RTL_UNCYL 0xa1	//左移指令
#define RTR_UNCYL 0xa0	//右移指令

#define DECODE0 0x80	//方式0译码
#define DECODE1 0xc8	//方式1译码
#define UNDECODE 0x90   //不译码方式

#define CMD_READ 0x15	//读键盘指令
#define ACTCTL 0x98		 //消隐指令
#define SEGON 0xe0		 //段点亮指令
#define SEGOFF 0xc0		 //段关闭指令
#define BLINKCTL 0x88	 //闪烁控制

//***主程序***
main()
{  uchar key_num;
   //send_byte(CMD_RESET);
  while(!key)
  {
     key_num=read7279(CMD_READ);
     switch(key_num)
         {
           case 0x00:
               { send_byte(CMD_RESET);
                 write7279(DECODE0,key_num);
                 send_byte(RTL_CYCLE);
                 break;
               }
           case 0x01:
                 send_byte(RTL_CYCLE);
           case 0x02:      
                 send_byte(RTR_CYCLE);
           case 0x03:
                 send_byte(BLINKCTL);
        }
   } 
}  



//****写****
void write7279(unsigned char cmd, unsigned char dta)
{
send_byte (cmd);
send_byte (dta);
}

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

//***发送***
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;
}

//***接收***
unsigned char receive_byte(void)
{
  unsigned char i, in_byte;
  dat=1;             //设为输入状态
  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);
}

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

//***短延时***
void short_delay(void)
{
unsigned char i;
for (i=0;i<8;i++);
}
// ********************* 延时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++)
{
if (!key)
{
//key_int();
}
}
}
}