CAN_BUS_Protocol_V2.0

STM32之CAN过滤器分析。在CAN协议里，报文的标识符不代表节点的地址，而是跟报文的内容相关的。为了让大家更加了解CAN接受过滤机制，本文主要讲解过滤器概念、寄存器及相关寄存器的配置。(CAN filter analysis of STM32.)

51单片机控制SD卡，并将SD卡中的字符分割存入数组，为下一步开发做准备。(51 MCU control SD card and SD card characters split into an array, to prepare for the next development.)

实现5110液晶图像、文字、字符 、反转、数字显示(5110 LCD achieve images, text, characters, reverse, digital display)

说明：  点阵显示原代码，上传的为c语言，也有原理图。(Dot matrix display of the original code, upload the c language, but also schematic.)

说明：  1602在STM32103上的实现，经过Protues和实体板子上运行，有用(Implementation of 1602 on STM 32103)

说明：  pcf8591 AD转换程序，可以实现电压表功能，四路模拟输入，一路输出DA输出。(pcf8591 AD conversion process, you can achieve the voltmeter function, four analog inputs, one output DA output.)

可控步进电机程序 msp430 tb6560(Controlled stepper motor program msp430 tb6560)

滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)

网上很多都是英语的，现在把CAN2.0规范中文版的分享出来，有需要的朋友可以下载下来学习了。(Chinese version of the CAN2.0 specification,)

4路pwm步进电机控制源代码，基于STM32f103芯片开发，自测可用(4 stepper motor pwm_ stm32)