iv_4_20ma

freescale单片机DFLASH应用例程源码(freescale microcontroller DFLASH application source code routines )

说明：  此应用笔记收集了用软件实现的主模式SPI程序。提供了8 个不同的SPI 主模式传输例。示例中包含SPI时钟相位和极性两个子例程：一个是用C 语言编写的例程，一个是为了提高速度用汇编语言编写的可被C 语言调用的例程。一个例子是在“C”程序中如何调用汇编同时提供了EEPROM接口例子。SPI是摩托罗拉商标。 此文档中描述的SPI功能使SPI处理的软件 最小化。在系统中使用C8051F30X 器件作为 总线上的SPI 主器件。(This application note collection implemented in software SPI master mode procedures. Provides 8 different SPI master mode transfer cases. Examples include SPI clock phase and polarity of the two sub-routines: one is written in C language routines, one is to increase the speed of assembly language written in C language can be called routine. One example is in the &quot C&quot programs how to call assembly also provides examples of EEPROM Interface. SPI is a Motorola trademark. SPI described in this document processing software capabilities to minimize the SPI. In the system C8051F30X SPI device as the primary device on the bus.)

实现基本C语言命令,帮助初学者掌握代码，老手路过(c language help study)

weiss所著的data structure in c的部分课后题答案。高清。(data structure in c answer)

矩阵按键，数码管显示状态及选手，蜂鸣器提示音(Matrix keys, digital display status and player, buzzer prompt sound)

通过AD模块采集电压，并经液晶1602显示，其包括1602的显示代码以及AD模块的IIC协议(Collected through the AD module voltage, and by 1602 the LCD display, which includes 1602 AD module display code and the IIC protocol)

使用51单片机和HTTP通信,运用AT指令实现，每一次发送指令都会返回OK否则不执行下一步。(Use 51 single chip microcomputer and HTTP communication, use AT instruction to achieve, each time send instruction will return OK or not to execute the next step)

将正负5v电压 转换成对应 pwm信号(The positive and negative voltage into the corresponding 5v pwm signal)

最新的低功耗传感器网络操作系统-contiki，支持文件系统，动态代码更新(The latest low-power sensor network operating system-contiki, supports file systems, dynamic code update)

1.由上位机发送1给单片机时，蜂鸣器以400ms频率发声，发2时以200ms频率发声，发3时以100ms频率发声，发4时关闲蜂鸣器。 1.以2400bps从计算机发送任一字节数据，当单片机收到该数据后，在此数据前加上一序号然后连同此数据一起发送至计算机，当序号超过255时归零。 2.以16进制发送一个0-65536之间的任一数，当单片机收到后在数码管上动态显示出来，波特率自定。 3. 用AD以1HZ的频率采集模拟信号，然后转换成数字量，再将其以1200bps发送到计算机，在计算机上显示。 4.按下矩阵键盘第一行时以1200bps发送，1，2，3，4，第二行时以2400bps发送5，6，7，8，第三行以4800bps发送，9，10，11，12，第四行以9600pbs 发送，13，14，15，16. (1. From the PC to send a single chip, the buzzer to 400ms frequency of sound, made 2 to 200ms frequency sound, made from 3 to 100ms frequency sound, made 4 free buzzer off. 1. To 2400bps from the computer to send any byte of data, when the microcontroller receives the data in this data with a serial number before then sent along with the data to the computer, the serial numbers when more than 255 zero. 2. To send a 16-hexadecimal any number between 0-65536, when the microcontroller in the digital receipt is displayed on a dynamic, custom baud rate. 3. 1HZ with the frequency of AD in order to capture analog signals, then converted to digital, and then send it to 1200bps to the computer, the computer display. 4. Press to 1200bps matrix keyboard to send the first row, 1,2,3,4, 5,6,7,8 the second row to 2400bps send the third line to 4800bps send, 9,10,11,12 , the fourth line to 9600pbs send, 13,14,15,16. )