//-----------------------------------------------------------------
//  名稱: 74HC595串入并出芯片應(yīng)用
//-----------------------------------------------------------------
//  說(shuō)明: 74HC595具有一個(gè)8位串入并出的移位寄存器和一個(gè)8位輸出鎖存器,
//        本例使用74HC595，通過(guò)串行輸入數(shù)據(jù)來(lái)控制數(shù)碼管顯示.
//
//-----------------------------------------------------------------
#include <iom16v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int

#define F_CPU  8000000UL

/*-----------------------------------------------------------------------
延時(shí)函數(shù)
系統(tǒng)時(shí)鐘：8M
-----------------------------------------------------------------------*/
void delay_1us(void) ;
void delay_nus(unsigned int n);
void delay_1ms(void);
void delay_nms(unsigned int n);

void delay_1us(void)                 //1us延時(shí)函數(shù)
  {
   asm("nop");
  }

void delay_nus(unsigned int n)       //N us延時(shí)函數(shù)
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1us();
  }
  
void delay_1ms(void)                 //1ms延時(shí)函數(shù)
  {
   unsigned int i;
   for (i=0;i<1140;i++);
  }
  
void delay_nms(unsigned int n)       //N ms延時(shí)函數(shù)
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }

//74595引腳定義
#define ST_CP  PC3   //輸出鎖存器控制脈沖
#define DS     PC1   //串行數(shù)據(jù)輸入
#define SH_CP  PC0   //移位時(shí)鐘脈沖

//74595引腳操作定義
#define ST_CP_1()  PORTC |=BIT(ST_CP)
#define ST_CP_0()  PORTC &=~BIT(ST_CP)
#define DS_1()  PORTC |=BIT(DS)
#define DS_0()  PORTC &=~BIT(DS)
#define SH_CP_1()  PORTC |=BIT(SH_CP)
#define SH_CP_0()  PORTC &=~BIT(SH_CP)
//數(shù)碼管段碼表
const uchar SEG_CODE[] = 
{0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
//-----------------------------------------------------------------
// 串行輸入子程序
//-----------------------------------------------------------------
void Serial_Input_595(uchar dat)
{
  uchar i;
  for(i=0;i<8;i++)
  {
    if(dat&0x80) DS_1();else DS_0();  //發(fā)送高位
    dat<<=1    //次高位左移到高位
    SH_CP_0();delay_nus(2);  //移位時(shí)鐘線拉低
    SH_CP_1();delay_nus(2);  //放在DS線的0或1在移位時(shí)鐘脈沖上升沿被移入595
   
  }
}

//-----------------------------------------------------------------
// 并行輸出子程序
//-----------------------------------------------------------------
void Parallel_Output_595()
{
  ST_CP_0();delay_nus(1);
  ST_CP_1();delay_nus(1);   //上升沿將數(shù)據(jù)送到輸出鎖存器
}

//------------------------------------------------------------------
// 主程序
//------------------------------------------------------------------
int main() 
{ 
  uchar i=0;
  DDRC=0xFF;
  while(1)
  {
    //將數(shù)字i的段碼字節(jié)串行輸入595
    Serial_Input_595(SEG_CODE[i]);
    //595移位寄存器數(shù)據(jù)傳輸?shù)酱鎯?chǔ)器并出現(xiàn)在輸出端
    Parallel_Output_595();
    delay_nms(300);
  }
}