[轉載]74HC595驅動

原創

2020-02-20 16:25

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit SDA =     P1^1;
sbit SHIFT_CP  =  P1^2;
sbit ST_CP     =  P1^0;
#define NOP     _nop_()
uchar ledcode[] = {0x3f,0x06,0x5b,0x4f,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
uchar ledbitselect[] = {0x0fe,0xfd,0xfb,0xf7};
uchar i;
void InitSerialPort(void)
{
  SDA = 0;
  SHIFT_CP = 0;
  ST_CP = 0;
}
void delay(void)
{
uchar jj;
for(jj=0;jj<200;jj++);
while(jj--);
}
void SerialSendData(uchar dat)
{
  uchar ii;
  uchar sdata=dat;
  for(ii=0;ii<8;ii++)
  {
    if(sdata&0x80)SDA=1;
else SDA = 0;
    sdata<<=1;
    SHIFT_CP =0;
    NOP;
    NOP;
    SHIFT_CP = 1;
    NOP;
    NOP;
  }
  ST_CP = 1;
  NOP;
  NOP;
  ST_CP = 0;
}

//LED 共陰
void main()
{
  InitSerialPort();
  while(1){
  delay();
  delay();
  P2 = ledbitselect;
  SerialSendData(ledcode);
  i=(i+1)%4;
  }
}