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231 lines
6.9 KiB
C
231 lines
6.9 KiB
C
/*
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* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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*/
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#include <lwip/opt.h>
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#include <lwip/sys.h>
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#include <lwip/sio.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <windows.h>
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/** If SIO_USE_COMPORT==1, use COMx, if 0, use a pipe (default) */
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#if SIO_USE_COMPORT
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#define SIO_DEVICENAME "\\\\.\\COM"
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#else
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#define SIO_DEVICENAME "\\\\.\\pipe\\lwip"
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#endif
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static int sio_abort=0;
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/* \\.\pipe\lwip0 */
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/* pppd /dev/ttyS0 logfile mylog debug nocrtscts local noauth noccp ms-dns 212.27.54.252 192.168.0.4:192.168.0.5
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*/
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/**
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* SIO_DEBUG: Enable debugging for SIO.
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*/
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#ifndef SIO_DEBUG
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#define SIO_DEBUG LWIP_DBG_OFF
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#endif
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#if SIO_USE_COMPORT
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/** When using a real COM port, set up the
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* serial line settings (baudrate etc.)
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*/
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static BOOL
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sio_setup(HANDLE fd)
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{
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COMMTIMEOUTS cto;
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DCB dcb;
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memset(&cto, 0, sizeof(cto));
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if(!GetCommTimeouts(fd, &cto))
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{
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return FALSE;
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}
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/* change read timeout, leave write timeout as it is */
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cto.ReadIntervalTimeout = 1;
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cto.ReadTotalTimeoutMultiplier = 0;
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cto.ReadTotalTimeoutConstant = 100; /* 10 ms */
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if(!SetCommTimeouts(fd, &cto)) {
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return FALSE;
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}
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/* set up baudrate and other communication settings */
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memset(&dcb, 0, sizeof(dcb));
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/* Obtain the DCB structure for the device */
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if (!GetCommState(fd, &dcb)) {
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return FALSE;
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}
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/* Set the new data */
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dcb.BaudRate = 115200;
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dcb.ByteSize = 8;
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dcb.StopBits = 0; /* ONESTOPBIT */
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dcb.Parity = 0; /* NOPARITY */
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dcb.fParity = 0; /* parity is not used */
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/* do not use flow control */
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dcb.fOutxDsrFlow = dcb.fDtrControl = 0;
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dcb.fOutxCtsFlow = dcb.fRtsControl = 0;
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dcb.fErrorChar = dcb.fNull = 0;
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dcb.fInX = dcb.fOutX = 0;
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dcb.XonChar = dcb.XoffChar = 0;
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dcb.XonLim = dcb.XoffLim = 100;
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/* Set the new DCB structure */
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if (!SetCommState(fd, &dcb)) {
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return FALSE;
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}
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return TRUE;
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}
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#endif /* SIO_USE_COMPORT */
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/**
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* Opens a serial device for communication.
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*
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* @param devnum device number
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* @return handle to serial device if successful, NULL otherwise
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*/
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sio_fd_t sio_open(u8_t devnum)
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{
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HANDLE fileHandle = INVALID_HANDLE_VALUE;
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CHAR fileName[256];
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LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu)\n", (DWORD)devnum));
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_snprintf(fileName, 255, SIO_DEVICENAME"%lu", (DWORD)(devnum));
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fileHandle = CreateFile(fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (fileHandle != INVALID_HANDLE_VALUE) {
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sio_abort = 0;
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FlushFileBuffers(fileHandle);
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#if SIO_USE_COMPORT
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if(!sio_setup(fileHandle)) {
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LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu): sio_setup. GetLastError() returns %d\n",
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(DWORD)devnum, GetLastError()));
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CloseHandle(fileHandle);
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return NULL;
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}
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#endif /* SIO_USE_COMPORT */
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LWIP_DEBUGF(SIO_DEBUG, ("sio_open: file \"%s\" successfully opened.\n", fileName));
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return (sio_fd_t)(fileHandle);
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}
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LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu) failed. GetLastError() returns %d\n",
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(DWORD)devnum, GetLastError()));
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return NULL;
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}
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/**
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* Sends a single character to the serial device.
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*
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* @param c character to send
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* @param fd serial device handle
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*
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* @note This function will block until the character can be sent.
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*/
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void sio_send(u8_t c, sio_fd_t fd)
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{
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DWORD dwNbBytesWritten = 0;
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LWIP_DEBUGF(SIO_DEBUG, ("sio_send(%lu)\n", (DWORD)c));
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while ((!WriteFile((HANDLE)(fd), &c, 1, &dwNbBytesWritten, NULL)) || (dwNbBytesWritten < 1));
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return;
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}
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/**
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* Receives a single character from the serial device.
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*
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* @param fd serial device handle
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*
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* @note This function will block until a character is received.
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*/
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u8_t sio_recv(sio_fd_t fd)
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{
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DWORD dwNbBytesReadden = 0;
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u8_t byte = 0;
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LWIP_DEBUGF(SIO_DEBUG, ("sio_recv()\n"));
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while ((sio_abort == 0) && ((!ReadFile((HANDLE)(fd), &byte, 1, &dwNbBytesReadden, NULL)) || (dwNbBytesReadden < 1)));
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LWIP_DEBUGF(SIO_DEBUG, ("sio_recv()=%lu\n", (DWORD)byte));
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return byte;
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}
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/**
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* Reads from the serial device.
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*
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* @param fd serial device handle
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* @param data pointer to data buffer for receiving
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* @param len maximum length (in bytes) of data to receive
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* @return number of bytes actually received - may be 0 if aborted by sio_read_abort
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*
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* @note This function will block until data can be received. The blocking
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* can be cancelled by calling sio_read_abort().
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*/
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u32_t sio_read(sio_fd_t fd, u8_t* data, u32_t len)
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{
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BOOL ret;
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DWORD dwNbBytesReadden = 0;
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LWIP_DEBUGF(SIO_DEBUG, ("sio_read()...\n"));
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ret = ReadFile((HANDLE)(fd), data, len, &dwNbBytesReadden, NULL);
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LWIP_DEBUGF(SIO_DEBUG, ("sio_read()=%lu bytes -> \n", dwNbBytesReadden, ret));
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return dwNbBytesReadden;
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}
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/**
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* Writes to the serial device.
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*
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* @param fd serial device handle
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* @param data pointer to data to send
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* @param len length (in bytes) of data to send
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* @return number of bytes actually sent
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*
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* @note This function will block until all data can be sent.
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*/
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u32_t sio_write(sio_fd_t fd, u8_t* data, u32_t len)
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{
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BOOL ret;
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DWORD dwNbBytesWritten = 0;
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LWIP_DEBUGF(SIO_DEBUG, ("sio_write()...\n"));
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ret = WriteFile((HANDLE)(fd), data, len, &dwNbBytesWritten, NULL);
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LWIP_DEBUGF(SIO_DEBUG, ("sio_write()=%lu bytes -> %d\n", dwNbBytesWritten, ret));
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return dwNbBytesWritten;
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}
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/**
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* Aborts a blocking sio_read() call.
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* @todo: This currently ignores fd and aborts all reads
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*
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* @param fd serial device handle
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*/
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void sio_read_abort(sio_fd_t fd)
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{
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LWIP_UNUSED_ARG(fd);
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LWIP_DEBUGF(SIO_DEBUG, ("sio_read_abort() !!!!!...\n"));
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sio_abort = 1;
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return;
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}
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