MCU Program - Dot Matrix LED Display I LVOE U

Download the schematic used in this program:  click here.  The microcontroller chip used is stc89c52; just find the schematic diagram of the dot matrix part. This is the circuit diagram of the entire microcontroller development board. Ignore the others.

The following is the program source code:
/******Dot matrix LED displays I LVOE U**************/
/**
*Function: The dot matrix LED delays one second to display I heart-shaped U (I LOVE YOU)
*Author: Xu Ran
*Date: 2013-06-12
*Remarks: The program was successfully debugged
**/
/*************AT89C52-RC MCU*******************/
/**************51hei development board********************/
#include
typedef unsigned int uint;
typedef unsigned char uchar;
sbit din = P2^0;//Data input end
sbit cs = P2^1;//Chip select end
sbit clk = P2^2; //Clock signal end
//Word module encoding
uchar code dis[][8] = {
{0x00,0x3C,0x18,0x18,0x18,0x18,0x3C,0x00}, // 'I'
{0x00,0x6C,0xFE,0xFE,0x7C,0x38,0x10,0x00}, // 'Heart'
{0x00,0xC3,0xC3,0xC3,0xC3,0xC3, 0x7E,0x3C} // 'U'
  }; // delay
:xms
void delay(uint xms) {
uint x
, y;   for (x = 0 ; x <
xms ; 8; i++) { clk = 0; din = (dat & 0x80); dat <<= 1; clk = 1; } } //Write MAX7219 data void write_max7219(uchar address, uchar date) { cs = 0; write_byte(address);//write address write_byte(date); //write data cs = 1; } //MAX7219 initialization void max7219_init() { write_max7219(0x0c, 0x01); write_max7219(0x09, 0x00); write_max7219(0x0a, 0x04); write_max7219(0x0b, 0x07); write_max7219(0x0f, 0x00); } //Main program void main(void) { uchar i, j; max7219_init(); while(1) { for(j = 0; j < 3; j++) { for(i = 0; i < 8; i++) { write_max7219(i+1, dis[j][i]); delay(1); } delay(1000); } } }