verilog digital stopwatch to achieve accurate to 10ms

用Verilog实现的脉冲宽度调制程序，在quartus平台上测试成功。(Using Verilog implementation of pulse width modulation, in quartus platform test successfully.)

verilog例子，有130多个，值得参考，新手很有帮助-Verilog example, there are more than 130, it is also useful, very helpful to novice

说明：  一种基于FPGA的调频连续波方位向多通道 FMCW SAR的实时成像信号处理方法及FPGA，包 括：步骤一、计算重构矩阵；步骤二、重构方位向 多通道数据，包括：步骤2 .1、对各个通道的回波 数据沿方位向分别间隔补零，并进行方位向傅里 叶变换；步骤2 .2、将方位向傅里叶变换之后各个 通道方位向相同位置的点组合为一个向量并与 重构矩阵相乘，得到重构完成的方位向数据；(An azimuth multichannel FMCW based on FPGA FMCW SAR real-time imaging signal processing method and FPGA, package Including: Step 1: calculate the reconstruction matrix; step 2: reconstruct the orientation Multichannel data, including: step 2.1, echo of each channel The data is compensated with zero along the azimuth direction respectively, and the azimuth Fourier is carried out Step 2.2, after the azimuth Fourier transform The points of the same position in the channel azimuth are combined into a vector and are connected withThe reconstruction matrix is multiplied to get the reconstructed azimuth data Step 2.3. Repeat step 2.3 for the data of different distance gates)

说明：  使用FPGA实现RGB图像转灰度图像的算法，下载入自己的电路板可直接将摄像头拍摄到的图像实时转换成灰度图像(FPGA is used to realize the algorithm of transforming RGB image into gray image. The image captured by the camera can be converted into gray image in real time by downloading it into its own circuit board)

VGA驱动及显示程序，用Verilog编写代码实现VGA的驱动和显示，并且提供了测试程序Testbench通过测试能得到正确的时序波形。(the source code for driving VGA and displaying the images,the testbench was offered.)

用于ATmega128的一些通讯程序，包含I2C　UART，SPI等接口，用ICCAVR编译(for ATmega128 some communications procedures, including UART I2C, SPI interfaces with ICCAVR compiler)

使用FPGA实现三相直流无刷电机换相，该程序可以使用(Use FPGA to realize the three-phase brushless DC motor commutation, the program can use)

VHDL常用实例，适合初学者，有计时器等常用例子-Common examples of VHDL, suitable for beginners, there are examples of commonly used timer, etc.

本文利用FPGA 可以弥补硬件插补器的不足，是执行速度提高，且可与运动控制部分很好的集成，制成运动控制器，实现高速运动控制

使用spi模式初始化w5100，实现了快速以太网的初步建立(Using the spi mode initialization w5100, to achieve the initial establishment of a Fast Ethernet)