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PDF 利用9021开发多功能彩灯，改变b1，b2，b3，b4可以控制彩灯(PDF to use 9021 to develop multi-function lantern, change b1, b2, b3, b4 can control lantern)

说明：  C51入门教程 代码 含编译文件 第3章 (C51 Getting Started Tutorial to compile the file containing the code in Chapter 3)

本例程实现一个简单的AM FM收音机功能。本程序无显示，通过串口打印信息。程序固定预设了武汉地区的FM电台和AM电台列表。上电缺省是FM模式，通过按键可以切换AM和FM。(This routine implements a simple AM FM radio. The program no display, print information through the serial port. Program fixed preset FM radio stations in Wuhan and AM station list. On power-up default mode is FM, AM and through the key switch FM.)

FAT的C语言原代码,没有底层驱动,支持打开文件,读写文件,不支持长文件名.(FAT C language source code, there is no bottom-driven support to open the document, read and write documents, do not support long file names.)

说明：  一个本人编写的时钟程序，用stc芯片，四位数码管，74ls164译码器。(I prepared a clock procedures, using STC chips, four digital tube, 74ls164 decoder.)

FM2404铁电存储器 的历程，与AT2404有点区别，按资料上的说读写速度会比AT2404(FM2404 FRAM process, and the AT2404 a little difference, according to data read and write speed on that than the AT2404)

用于在通讯协议中生成crc校验码，保证通讯数据的完整性(Used to generate crc check code in communication protocol to ensure the integrity of communication data)

MAXplus抢答器课程设计做了很久的验证通过(MAXplus Responder course design a long time ago passed the test)

说明：  TLC5615产生各种波形，dac处理芯片，精度为十位的DAC，产生方波 正弦波 三角波等(TLC5615Produce various waveform形)

/*EEPROM24C02,程序将对存储器进行读和写，因此涉及到键盘程序，比较复杂，耐心学，*/#include <reg51.h>#include <intrins.h>#define W24C020xA0//存储器的写地址 #define R24C02 0xA1 //存储器的读地址 #define MSB 0x80 //8位二进制最高位置1 #define LSB 0x01 //8位二进制最低位置1 (/* EEPROM24C02, program will read and write memory, it involves the keyboard program, more complex, patient study,* /# include <reg51.h># Include <intrins.h># Define W24C020xA0// write the memory address# define R24C02 0xA1// read memory address# define MSB 0x80// 8 bit binary highest position 1# define LSB 0x01// 8 bit binary lowest 1)