3_9PSCAD

此程序为4*4矩阵键盘，键盘自身不带电源电阻，八个接线，在程序中进行需进行软件拉高拉低以便按键扫描。 应用单片机为MSP430F5529。(4* 4 matrix keyboard without power resistors MSP430F5529)

可实现有源功率因数校正功能，可以保证交流输入电压电流同相位，采用的是boost主电路拓扑(Active Power Factor Correction )

将每2片74595做级联，然后再将级联之后的所有时钟线与数据再并联在一起最后对每一组的锁存控制线做单独控制.(Application to do a project, the more I/O, applied to the 74,595 to do the extension, but you want to mount multi-chip 74595, is bound to have a lot to use the I/O port, in order to solve this problem, I will be every 2 sheet 74595 do cascade, and then cascade after all the clock line and the data in parallel and then together (i.e., all 74595 communal clock and data lines, it only occupies two I/O port lines) Finally, for each group latch control lines do individually controlled (equivalent to Chip Select), so that a hardware circuit by a great degree of simplification, both procedures can also share a driving subroutine 74595, to control the type of lock inventory control line, serial data is sent to the port 74595 cascade module. As a result of the hardware and software have a large degree of optimization.)

Program that simulates in C ++ with Proteus for a matrix decoder 16F84A

液晶例程， 包括画点画线画缓冲条，在液晶上printf的算法(LCD program world，you can study LCD draw points )

STM32F746 FSMC-SDRAM 编程示例 采用HAL库实现 内含STM32CubeMX 配置(the sample for STM32F746 FSMC-SDRAM the code contains the settings for the HAL_Drivers)

基于pic16f676 EEPROM的问题 用软件仿真没问题，但烧到片子里，不能正常运行。情况是这样的：假如循环向EEPROM中写数据，9，8，7，6，5，4，3，2，1，然后读，发现每一位读出的都一样，是写循环中第一个写进去的字节，也就是9。其他的并没有写进去。 EEPROM的写通过判断标志位就可以，但是在下一次写之前要清除上一次写完成的标志位。也就是说，每次写完要清除完成标志位，否则下一次写不进去。(Based on pic16f676 EEPROM problem With the software simulation no problem, but burn to film, not normal operation. The fact of the matter is: if cycle to write the data of EEPROM, 9,8,7,6,5,4,3,2,1, then read, and found that each of the read, write the first cycle is written in bytes, also is 9. The other are not written in. Write through the judgement of EEPROM sign a can, but in the next write to remove the last completed before writing the sign of a. That is, every time to remove the written finish marks a, or the next write in. )

基于MSP430舵机控制程序，SG90舵机，由PWM进行控制(MSP430-based steering control procedure, SG90 servos controlled by the PWM)

high speed pcb design spicification, the book is very useful.

说明：  基于51单片机的简易交通灯的设计，能够实现简易交通灯功能。(Design of Simple Traffic Light Based on 51 Single Chip Microcomputer)