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| /* This file is part of MoteCtrl |
| http://www.mikrokopter.de/ucwiki/en/MoteCtrl |
| */ |
| |
| //Include header files, which provide resources, pc_serial_port.c needs: |
| #include <windows.h> //Windows API, to interface with the serial port |
| #include <stdio.h> //Standard I/O (printf for instance) |
| |
| #include "pc_serial_port.h" |
| |
| |
| /* |
| Compiler & Linker Porperties: |
| Set "Character Set"-CompilerFlag to "Not Set" or "Multi Byte Character Set" to |
| avoid Errors about Windows API functions that can handle Unicode paramters. |
| In Visual Studio: Properties of Project -> Configuration Properties -> General |
| */ |
| |
| |
| HANDLE hCom; //Handle, which contains inf about the opened Device File |
| //(the opened COM-Port, returned by CreateFile function) |
| |
| //Initialize & Configure COMx-Port |
| //return value: EXIT_FAILURE=1, EXIT_SUCCESS=0 (stdlib macros) |
| int init_com_port(int comNumber) { |
| |
| DCB dcb; //Device Control Block, contains Configuration for COM-Port |
| char comPort[5] = {'C','O','M'}; //Number and String Terminator to be added |
| int fSuccess; //Stores inf about file-actions (action succeeded or failed) |
| COMMTIMEOUTS timeouts; //Struct, which stores inf about the timeout |
| //behaviour of the COM-Port |
| |
| //Get the Com-Port Number: |
| comPort[3] = 48 + comNumber; //COMx (x is ASCII coded) |
| comPort[4] = 0; //add string Terminator 'NUL' |
| |
| //Create Device File, initialize serial Port: |
| hCom = CreateFile( comPort, //open COMx Device (pointer to comPort-String) |
| GENERIC_READ | GENERIC_WRITE, //write/read permisions |
| 0, // must be opened with exclusive-access |
| NULL, // default security |
| OPEN_EXISTING, // must use OPEN_EXISTING |
| 0, // no overlapping |
| NULL // hTemplate must be NULL for comm devices |
| ); |
| |
| //Check, if CreateFile succeeded: |
| if (hCom == INVALID_HANDLE_VALUE) { |
| printf ("***ERR: CreateFile failed with error %d.\n", GetLastError()); |
| return EXIT_FAILURE; |
| } |
| |
| //Get the currently active Device Control Block (DCB) for the COMx: |
| SecureZeroMemory(&dcb, sizeof(DCB)); //initialize entire dcb-struct with zeros |
| dcb.DCBlength = sizeof(DCB); |
| fSuccess = GetCommState(hCom, &dcb); //write the current configuration to |
| //our dcb-struct |
| |
| //GetCommState returns 0, if error occured while getting the DCB |
| if (!fSuccess) { |
| printf ("***ERR: GetCommState failed with error %d.\n", GetLastError()); |
| return EXIT_FAILURE; |
| } |
| |
| /*Change the values of the obtained dcb-struct to match the config of the |
| *Mikrokopter. Currently the FlightControl communicates at: |
| *57600 Baud (bps), 8 Data bits, no parity bit, 1 stop bit */ |
| |
| dcb.BaudRate = CBR_57600; // Set Baudrate |
| dcb.ByteSize = 8; // data size, transmit and receive |
| dcb.Parity = NOPARITY; // no parity bit |
| dcb.StopBits = ONESTOPBIT; // one stop bit |
| |
| //Send reconfigured dcb back to COMx Device-File: |
| fSuccess = SetCommState(hCom, &dcb); |
| |
| //SetCommState returns a 0, if error occured while setting the DCB for COMx |
| if (!fSuccess) { |
| printf ("***ERR: SetCommState failed with error %d.\n", GetLastError()); |
| return EXIT_FAILURE; |
| } |
| |
| //Configure the Read-Timeout behaviour of the initialized COMx-Port: |
| |
| /* The following Read-Timeout config determines the behaviour of the |
| ReadFile cmd (applied to the initialized COMx-Port): |
| If a Byte is in the Hardware UART-Buffer of the initialized COM-Port and |
| the ReadFile function is called, this byte is read. If theres no byte in |
| the UART-InputBuffer and the ReadFile function is called, the ReadFile |
| function will return *immediatly* (BytesRead parameter is zero then). |
| */ |
| timeouts.ReadIntervalTimeout = MAXDWORD; |
| timeouts.ReadTotalTimeoutMultiplier = 0; |
| timeouts.ReadTotalTimeoutConstant = 0; |
| |
| //Send the Timeout-Config to the COM-Port: |
| fSuccess = SetCommTimeouts (hCom, &timeouts); |
| |
| //Check, if setting the timeout-settings was successfull: |
| if(!fSuccess) { |
| printf("***ERR: SetCommTimeouts failed with error %d.\n", GetLastError()); |
| return EXIT_FAILURE; |
| } |
| |
| |
| //Initialization & Configuration of COMx done! |
| return EXIT_SUCCESS; |
| } |
| |
| |
| //Function which reads 1 Byte of the Rx-Buffer of the initialized COM-Port: |
| //Return value: Number of the bytes read (should be 0 or 1) |
| int getCharFromCom (char* inputBuffer) { |
| |
| int numOfBytesRead; |
| ReadFile (hCom, inputBuffer, 1, &numOfBytesRead, NULL); |
| //read char is stored in the passed char-buffer |
| |
| return numOfBytesRead; |
| |
| } |
| |
| |
| //Function which writes [length] Byte to the Tx-Buffer of the initialized COM-Port: |
| //Returns something>0 if write failed, 0 if successfull |
| int sendStringToCom (char* toSend, int length) { |
| |
| int numOfBytesWritten; |
| |
| //write char to which the passed char-pointer points to |
| return WriteFile (hCom, toSend, length, &numOfBytesWritten, NULL); |
| } |