lwip-contrib-mac/ports/win32/sio.c

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