dtmf

24位高精度模数转换器ADS1258的原理及应用 用例子讲解如何使用以及要注意的问题(ADC ADS1258 24-bit high-precision application of the principle and explain with examples how to use and pay attention to the problem)

I2C总线协议应用,利用单片机中断实现可以记忆的时钟,程序自己已经调试过，绝对能用(I2C bus protocol applications, the use of the microcontroller interrupt memory clock, program debugging, and absolutely can)

飞思卡尔智能车竞赛11年完整版程序，速度可上2.7m/s(freescale )

说明：  使用超声波测量距离，可以参考一下这个代码，适用于32。(Using ultrasonic to measure distance, you can refer to this code, which is suitable for 32.)

DS1990A的C51读写程序(DS1990A read and write procedures for the C51)

说明：  硬件资源: 1,DS0(连接在PA8)，DS1(连接在PD2上) 2,串口1(波特率:115200,PA9/PA10连接在板载USB转串口芯片CH340上面) 3,ALIENTEK 2.8/3.5/4.3寸LCD模块(仅支持MCU屏) 4,按键KEY0(PC5)/KEY1(PA15)/KEY_UP(PA0,也称之为WK_UP) 实验现象: 通过按键KEY_UP可以控制定时器AutoReloadTimer_Handle的开启，这个是 周期定时器，一旦开启就会不断的运行，直到按下KEY1将其关闭。按下KEY0 可以打开定时器OneShotTimer_Handle，这是个单次定时器，只会运行一次， 运行周期到了以后就会停止运行，除非按下按键KEY0将其再次开启。(Hardware resources: 1, DS0 (connected to PA8), DS1 (connected to PD2) 2. Serial port 1 (baud rate: 115200, PA9/PA10 connected on board USB to serial chip CH340) 3, ALIENTEK 2.8/3.5/4.3 inch LCD module (only supporting MCU screen) 4. Keyboard KEY0 (PC5)/KEY1 (PA15)/KEY_UP (PA0, also known as WK_UP) Experimental phenomena: The timer AutoReloadTimer_Handle can be turned on by keying KEY_UP. This is The periodic timer will run continuously once it is turned on until KEY1 is pressed to turn it off. Press KEY0 You can turn on the timer OneShotTimer_Handle, which is a single timer and only runs once. The run cycle will stop after that unless KEY0 is pressed to turn it on again.)

基于51单片机的PT2314音频功放程序，可实现MIC和音频输入切换及音量音调控制，并用5110显示(Based on 51 single-chip audio amplifier PT2314 program can achieve MIC and audio input switching and volume tone control and display with 5110)

查询式矩阵键盘，可以用数码管显示也可以用液晶显示屏显示，我用了lcd1602显示！(Inquiry matrix keyboard, can be displayed by digital tube, can also be displayed with LCD display, I used the LCD1602 display!)

说明：  8051 练习项目，包含串口、定时器、红外遥控、LCD1602、SMI串行总线读写等功能。(8051 exercise items, including serial port, timer, infrared remote control, LCD1602, SMI serial bus reading and writing functions.)

风河编写的用于pc104板can接口的驱动代码(Wind River prepared for pc104 board can interface driver code)