arm7 Litian Electronics lpc2148 GPIO pattern water light

The LPC2148 development board of Litian Electronics has four running lights. They are connected to the SN74HC595D and then connected to the 2148 processor. First light up the two on the sides (16, 19), then light up the two in the middle (17, 18). When turning off, turn off the two on the sides first, then the one in the middle. The program is shown in the figure below:

#include

#define SCLK 0x01<<24

#define MISO 0x01<<5

#define MOSI 0x01<<6

#define RCK 0x01<<7

void Delayn(unsigned long n);

void HC595_Init(void);

void Write595(void);

unsigned int HC595_DATA = 0;

//Initialize 595 interface

void HC595_Init(void)

{

  IO0DIR |= MOSI|RCK;

  IO1DIR |= SCLK;

  IO1CLR |= SCLK;

  IO0DIR |= RCK;

  HC595_DATA = 0xFFFFFFFF; Write595();

}

//Write bytes

void WriteByte(unsigned char data)

{

  unsigned char i;

  //IO0CLR = RCK;

  for(i=0;i<8;i++)

  {

    if(data&0x01) IO0SET=MOSI;

    else IO0CLR=MOSI;

    IO1SET=SCLK;

    data>>=1;

    IO1CLR=SCLK;

  }

  //IO0SET = RCK;

}

//Refresh 595 data

void Write595(void)

{

  IO0CLR = RCK;

  WriteByte(HC595_DATA&0xff);

  WriteByte((HC595_DATA&0xff00)>>8);

  WriteByte((HC595_DATA&0xff0000)>>16);

  WriteByte((HC595_DATA&0xff000000)>>24);

  IO0SET = RCK;

}

main(void)

{

  // Initialize 74HC595

  HC595_Init();

  //Main loop

  while(1)

  {

    HC595_DATA &=~(1<<16);Write595();

    HC595_DATA &=~(1<<19);Write595();

    Delayn(1000000);

    HC595_DATA &=~(1<<17);Write595();

    HC595_DATA &=~(1<<18);Write595();

    Delayn(1000000);

    HC595_DATA |=(1<<16);Write595();

    HC595_DATA |=(1<<19);Write595();

    Delayn(1000000);

    HC595_DATA |=(1<<17);Write595();

    HC595_DATA |=(1<<18);Write595();

    Delayn(1000000);  

  }

}

//Delay cycle number

void Delayn(unsigned long n)

{

  while(n--);

}