串口通信

[rainit2006]

---

[rainit2006]

• Serial Port Sample https://code.msdn.microsoft.com/windowsdesktop/Serial-Port-Sample-e8accf30

• Serial UART Basics http://gopinaths.gitlab.io/post/serial_uart/

Windows CreateFile : opens a communications port.

hPort1 = CreateFile (TEXT("COM5"),                      // Name of the port 
                        GENERIC_READ | GENERIC_WRITE,     // Access (read-write) mode 
                        0,                                  
                        NULL,                             
                        OPEN_EXISTING,
                        FILE_ATTRIBUTE_NORMAL,                     
                        NULL);                 

Writefile： transmitting data out the communications port . ReadFile: Reading Data from the Port. CloseHandle(hComm): close the serial port,

There are number of factors effecting read and write behaviours baud-rate, time-outs,Software flow control etc. These all values should be properly configured before read and write operations. ex. COMMTIMEOUTS,

• UART uart(Universal Asynchronous Receiver/Transmitter)是一种异步通信协议。

• GetCommState函数 Retrieves the current control settings for a specified communications device.

• GetCommTimeouts (hPort2, &CommTimeouts); Retrieves the time-out parameters for all read and write operations on a specified communications device.