DE2-70 camera

FPGA做VGA视频显示的详细资料，我找了很久才收集起的，有四篇文章，很有用(FPGA do VGA video display detailed information, I found a long time before they start collecting, with four articles, very useful)

FPGA上的VERILOG语言编程。通过查找表实现直接数字频率合成。在主控部分通过键盘选择正弦波，方波，三角波，斜波，以及四种波形的任意两种的叠加，以及四种波形的叠加；通过控制频率控制字C的大小，以控制输出波形频率，实现1Hz的微调；通过地址变换实现波形相位256级可调；通过DAC0832使波形幅值256级可调；通过FPGA内部RAM实现波形存储回放；并实现了每秒100HZ扫频。(FPGA on the verilog language programming. Lookup table through direct digital frequency synthesis. In part through the control of the keyboard to choose sine, square, triangle wave, sloping wave, and four arbitrary waveform two superposed and the stack of four waveform; by controlling the frequency control word on the size, in order to control the output waveform frequency, 1 Hz to achieve the fine-tuning; Address transform through waveform phase adjustable 256; DAC0832 so through waveform amplitude adjustable 256; FPGA through internal RAM to the waveform storage intervals; and achieve a 100 per second sweep 9999.)

加法器，输入两个整数，用电路图形式将其逻辑原理呈现出来，该加法器为8位运算，每一位都对应一张电路图，可展示其完整过程(Adder, input two integer, with circuit diagram form its logical principle appear, this adder is 8 bit arithmetic, each corresponding to a circuit diagram, can show the complete process)

说明：  之前一直找不到自学编写了一个，PID案例，分享下(I have been unable to find a self-taught, compiled a PID case, share under)

说明：  DDS的基本原理主要由五部分组成，分别是；相位累加器，正弦波形存储器，数模转换器，低通滤波器和时钟，将相位累加器输出的数据作为地址，用来查询表的数据，将取出的正弦数据通过数模转换器输出模拟信号，模拟信号再通过一个低通滤波器输出纯净的正弦波信号。(The basic principle of DDS is mainly composed of five parts: phase accumulator, sinusoidal waveform memory, digital to analog converter, low-pass filter and clock. The output data of phase accumulator is used as address to query the data of table. The extracted sinusoidal data is output analog signal through digital analog converter, and the analog signal is output pure sine through a low-pass filter Wave signal.)

可以产生正弦波，三角波、锯齿波、方波，要求频率1Hz-100kHz，步进1Hz，具有自动扫频功能； 正弦波的相位可调，方波的占空比可调； (Can generate sine wave, triangle wave, sawtooth wave and square wave, the required frequency of 1 hz- 100 KHZ, step 1 hz, with functions of automatic frequency sweep The phase adjustable sine wave, square wave duty ratio is adjustable )

七段数码管显示的时钟程序VHDL代码 ISE编译环境(SEVEN seg VHDL ISE CLOCK)

基于PID 控制算法的直流电机控制，输出PWM波，很容易用(motor control)

EDA/VHDL数字频率计，可编程逻辑门阵列，EDA课程设计(EDA/VHDL digital frequency meter, programmable logic gate array, EDA curriculum design)

本代码是异步FIFO的VERILOG HDL代码，代码除了实现基本的异步FIFO跨时钟域数据传输以外，代码简单易读，可以作为笔试或者面试手写代码的备考代码，本人华为FPGA逻辑开发工程师岗位面试手写的异步FIFO程序就是出自本代码