516790

说明：  PORT 在线通讯源代码，用于串口通讯。(PORT online communications source code for serial communication.)

说明：  自己编写的变异的modbus，先分享给大家(the modbus by myself,now give all)

hdlc设计，包括flag检测，插0、串并转换等设计，采用verilog编程。(hdlc design, using verilog)

Ymodem传输，基于VC6，可以当串口调试(about Ymodem)

串口发送modbus协议CRC校验低字节（若为查表所得数据为高字节，其实为CRC的低字节）(serial modbus connection agreement low byte CRC (if available for look-up table for the high-byte data, In fact, for low-byte CRC))

说明：  串口通讯实验： 本实验得到的结果为，打开超级终端，设置波特率为115200，数据流控制位为无。运行系统，就会显示“UART & Interrupt Experiment,Please Input from the keyboard”，我们就可以通过写串口操作。 在flash调试时，需要修改RO BASE为0x00000000，其他不用修改，重新编译下载就可运行。 注意：由于系统产生中断，程序计数器就会跳到0x18处执行中断服务子程序，所以不能在SDRAM调试。 (Serial communication experiment: the results of this experiment, open HyperTerminal, set the baud rate to 115200, data flow control bit is not. Operating system, it will display &quot UART &amp Interrupt Experiment, Please Input from the keyboard&quot , we can write the serial port operation. Debug in flash, you need to modify the RO BASE is 0x00000000, the other not modify, recompile download can run. Note: Due to system interrupt, the program counter will jump to 0x18 Department execute the interrupt service routine, it can not debug the SDRAM.)

说明：  压力传感器xgzp6867iic读取程序(Pressure sensor xgzp6867iic reading program)

DLT645的数据读取,设置串口，后期可能通过数据库读取(read for DLT645 electric)

基于VC实现的串口通信，可以实现串口的数据读取。(Based on the VC serial communications)

调试使用的串口助手，程序源码，功能齐全，可以调试程序(Serial Port Assistant for Debugging, Program Source Code, Full-featured, Debugging Program)