Elevator_controller_based_on_74

通过IO口控制两路24V电压输出，一路24V转两路24V(Two 24V voltage outputs are controlled by IO port, one 24V is converted to two 24V.)

说明：  提供一个基于瑞昱RTL8382L24口交换芯片的24口+2光口的千兆交换参考设计。包括基于Cadence平台设计的原理图、PCB和RTL8382L、RTL8281B的技术手册。(A Gigabit switching reference design based on 24 + 2 optical ports of Ruiyu RTL8382L24 switch chip is provided. Including the schematic design based on the Cardence platform, PCB and RTL8382L, RTL8281B technical manual.)

说明：  Basic principle of LDPC code and FPGA implementation of LDPC code

说明：  DAC7811驱动，好用的，测试电路是芯片手册12页给出的电路(The driver of DAC7811,I tested it and it could work well.)

AD9914是一款直接数字频率合成器(DDS)，内置一个12位数模转换器，目标工作速率最高达3.5 GSPS，产生单音信号，双音信号以及调幅调相信号(AD9914 is a direct digital frequency synthesizer (DDS) with a 12 digit analog converter with a target operating rate of up to 3.5 GSPS, producing a single tone signal, a dual tone signal and a phase modulation signal.)

说明：  DDR4原理图 PCB参考。 pdf版本原理图以及allegro PCB文件。(cadence ddr4 allegro pdf)

FPGA和STM32F103的多轴控制硬件设计，包含原理图，PCB(FPGA and STM32F103 multi-axis control hardware design, including schematics, PCB)

说明：  FloTHERM的使用入门手册，写的很好(FloTHERM Introduction Manual, well written)

BK4815模块基本功能，对讲机最小模块(The basic functions of the BK4815 module)

说明：  使用DCDC电源驱动步进电机正转和反转，PWM波控制转速(DCDC power supply is used to drive forward and reverse rotation of stepping motor, and PWM wave is used to control speed)