VB上位机控制LED灯程序

intel pxa255 平台 bootloader 源代码包-Bootloader source code

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.

南描述了如何在AT90S1200上实现轮询(polled)软件UART-South describes how to achieve the AT90S1200 Polling (polled) software UART

these all are the rtos32 example code

使用STC15W4K系列MCU发出带死区的PWM波，占空比可调，可用于驱动半桥电路，BUCk，BOOST带同步整流的驱动。使用本代码前，请到STC官网下载STC15W4K系列的头文件，这里不给出。使用函数set_pwm()可设置占空比，使用前要先初始化init_pwm().在初始化函数里涉及到PWM引脚，PWM周期，初始电位，是否在二分之一duty处触发ADC，初始占空比设置，使用时可以参照数据手册按需求修改，这里只是一个实际的应用例程，希望有所帮助。

基于STH75温湿度模块的采集系统。程序采用状态机。安全有效。单片机采用C8051F311，内附串口，I2C，片内FLASH编程操作。采用消息机制。满足快速响应。

基于linux2.4内核下,外接于AT91RM9200处理器IO上的DS18B20驱动及测试程序。硬件平台为：中嵌科技的CE9200-1开发板-Based on linux2.4 core, the external IO in the AT91RM9200 processor

一个不错的需求分析实例！希望对大家有帮助-A good example of the needs analysis! Hope everyone has to help

气体报警程序,外部给出干接点.发光管闪烁报警-gas alarm procedures, external contact is dry. Blinking LED Alarm

用OV7720制作摄像头的详细电路原理图 ，以及初始化代码，使用范例。-OV7720 camera with the production of a detailed circuit schematic diagram, as well as initialization code, the use of examples.