STM32 MODBUS

DOS下采用中断接收数据的串口通讯的例子,很难找到的好东西!-DOS interrupt receiving serial data communications example, it is difficult to find the good stuff!

用于对udma控制器的编程，采用C语言-right UDMA controllers for programming using C language

本源代码是基于keil环境下的，可以进行modbus协议之间的转换，例如：modbus rtu，modbus tcp，modbus ascll等等，对初学者都有很好的作用

sharp触摸屏测试代码-sharp touch screen test code

嵌入式linux平台下串口芯片st16c554的驱动，处理器为s3c2410，四路串口共享中断，外接时钟信号-Embedded linux platform serial chip st16c554 driven processor s3c2410, four serial ports share the interrupt, external clock signal

下面是一个超声波测距的程序，硬件电路由于电脑格盘已丢失，下面的代码是从样机上复制的。 硬件电路包括液晶显示、超声波的发射、超声波的接受、滤波、单片机处理。 液晶显示采用LCD1602模块，下面的代码里有液晶的驱动，可以拷贝用于它处。 超声波发射电路包括压电换能器及其支持电路，发射约44KHz的超声波。 超声波的接收电路包含一块CD40106处理芯片。技术指标大约是测距范围在三米左右，测量精度约在厘米级别。大量用于倒车雷达的测距中。-The following is a range of ultrasound procedures, the hardware circuit as a result of the computer grid plate has been lost, the following code is copied from the prototype. Hardware circuit including liquid crystal display, ultrasonic transmitter, ultrasonic acceptance filtering, single-chip processing. LCD1602 LCD module used, the following code, there are LCD drivers, you can use it to copy. Firing circuit including the piezoelectric ultrasonic transducer and its support circuitry, fired about 44KHz ultrasound. Ultrasonic receiver circuit includes a processing chip CD40106. Technical indicators for a range of about 3 meters range around the measurement precision level of about cm. Reversing a large number for the location of the radar.

39sf040驱动-39sf040 Drivers

嵌入式Linux设计（相当不错的资料）-embedded Linux design (good information)

HART协议由Rosemount公司开发且已向每个使用者开放HART协议采用标准的Bell 202频移键控信号以1200波特通信以低电平加载于4mA~20mA模拟信号上，由于载波信号的平均值为零所以它对模拟信号没有影响。-HART agreement develops by Rosemount Corporation also opened the HART agreement to each user to use the standard the Bell 202 frequency-shift keying signal increase by 1,200 bauds correspondences by the low level on the 4mA~20mA simulated signal, because intelligence signal mean value for zero therefore it has not affected to the simulated signal.

a=b+c；