[proxmark3-svn] / client / uart.c

/*
 * Proxmark3 generic uart / rs232/ serial port library
 *
 * Copyright (c) 2012, Roel Verdult
 * 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. Neither the name of the copyright holders nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''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 COPYRIGHT HOLDERS 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.
 *
 * @file uart.c
 * @brief
 *
 * Partly based on uart-code written by Teunis van Beelen, available:
 * http://www.teuniz.net/RS-232/index.html
 *
 */

#include "uart.h"
#include "messages.h"

// Test if we are dealing with unix operating systems
#ifndef _WIN32

#include <termios.h>
typedef struct termios term_info;
typedef struct {
  int fd;           // Serial port file descriptor
  term_info tiOld;  // Terminal info before using the port
  term_info tiNew;  // Terminal info during the transaction
} serial_port_unix;

// Set time-out on 30 miliseconds
const struct timeval timeout = { 
  .tv_sec  =     0, // 0 second
  .tv_usec = 30000  // 30000 micro seconds
};

// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
#define CCLAIMED 0x80000000

serial_port uart_open(const char* pcPortName)
{
  serial_port_unix* sp = malloc(sizeof(serial_port_unix));

  if (sp == 0) return INVALID_SERIAL_PORT;

  sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
  if(sp->fd == -1)
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  if(tcgetattr(sp->fd,&sp->tiOld) == -1)
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  // Make sure the port is not claimed already
  if (sp->tiOld.c_iflag & CCLAIMED)
  {
    uart_close(sp);
    return CLAIMED_SERIAL_PORT;
  }

  // Copy the old terminal info struct
  sp->tiNew = sp->tiOld;

  sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
  sp->tiNew.c_iflag = CCLAIMED | IGNPAR;
  sp->tiNew.c_oflag = 0;
  sp->tiNew.c_lflag = 0;

  sp->tiNew.c_cc[VMIN] = 0;      // block until n bytes are received
  sp->tiNew.c_cc[VTIME] = 0;     // block until a timer expires (n * 100 mSec.)

  if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1)
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  tcflush(sp->fd, TCIFLUSH);
  return sp;
}

void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
{
  DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
  // Set port speed (Input and Output)
  speed_t stPortSpeed = B9600;
  switch(uiPortSpeed) {
    case 9600: stPortSpeed = B9600;
    break;
    case 19200: stPortSpeed = B19200;
    break;
    case 38400: stPortSpeed = B38400;
    break;
    case 57600: stPortSpeed = B57600;
    break;
    case 115200: stPortSpeed = B115200;
    break;
    case 230400: stPortSpeed = B230400;
    break;
#ifdef B460800
    case 460800: stPortSpeed = B460800;
    break;
#endif
    default:
#ifdef B460800
      ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
#else
      ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200 or 230400.", uiPortSpeed);
#endif
  };
  const serial_port_unix* spu = (serial_port_unix*)sp;
  cfsetispeed((struct termios*)&spu->tiNew, stPortSpeed);
  cfsetospeed((struct termios*)&spu->tiNew, stPortSpeed);
  if( tcsetattr(spu->fd, TCSADRAIN, &spu->tiNew)  == -1)
  {
    ERR("Unable to apply new speed settings.");
  }
}

uint32_t uart_get_speed(const serial_port sp)
{
  uint32_t uiPortSpeed = 0;
  const serial_port_unix* spu = (serial_port_unix*)sp;
  switch (cfgetispeed(&spu->tiNew))
  {
    case B9600: uiPortSpeed = 9600;
    break;
    case B19200: uiPortSpeed = 19200;
    break;
    case B38400: uiPortSpeed = 38400;
    break;
    case B57600: uiPortSpeed = 57600;
    break;
    case B115200: uiPortSpeed = 115200;
    break;
    case B230400: uiPortSpeed = 230400;
    break;
#ifdef B460800
    case B460800: uiPortSpeed = 460800;
    break;
#endif
  }

  return uiPortSpeed;
}

void uart_close(const serial_port sp)
{
  tcsetattr(((serial_port_unix*)sp)->fd,TCSANOW,&((serial_port_unix*)sp)->tiOld);
  close(((serial_port_unix*)sp)->fd);
  free(sp);
}

bool uart_cts(const serial_port sp)
{
  char status;
  if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
  return (status & TIOCM_CTS);
}

bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
{
  int res;
  int byteCount;
  fd_set rfds;
  struct timeval tv;

  // Reset the output count  
  *pszRxLen = 0;

  do {
    // Reset file descriptor
    FD_ZERO(&rfds);
    FD_SET(((serial_port_unix*)sp)->fd,&rfds);
    tv = timeout;
    res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);

    // Read error
    if (res < 0) {
      DBG("RX error.");
      return false;
    }

    // Read time-out
    if (res == 0) {
      if (*pszRxLen == 0) {
        // Error, we received no data
        DBG("RX time-out, buffer empty.");
        return false;
      } else {
        // We received some data, but nothing more is available
        return true;
      }
    }

    // Retrieve the count of the incoming bytes
    res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
    if (res < 0) return false;

    // There is something available, read the data
    res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);

    // Stop if the OS has some troubles reading the data
    if (res <= 0) return false;

    *pszRxLen += res;

  } while (byteCount);

  return true;
}

bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
{
  int32_t res;
  size_t szPos = 0;
  fd_set rfds;
  struct timeval tv;

  while (szPos < szTxLen)
  {
    // Reset file descriptor
    FD_ZERO(&rfds);
    FD_SET(((serial_port_unix*)sp)->fd,&rfds);
    tv = timeout;
    res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);

    // Write error
    if (res < 0) {
      DBG("TX error.");
      return false;
    }

    // Write time-out
    if (res == 0) {
      DBG("TX time-out.");
      return false;
    }

    // Send away the bytes
    res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
    
    // Stop if the OS has some troubles sending the data
    if (res <= 0) return false;

    szPos += res;
  }
  return true;
}

#else
// The windows serial port implementation

typedef struct { 
  HANDLE hPort;     // Serial port handle
  DCB dcb;          // Device control settings
  COMMTIMEOUTS ct;  // Serial port time-out configuration
} serial_port_windows;

void upcase(char *p) {
	while(*p != '\0') {
		if(*p >= 97 && *p <= 122) {
			*p -= 32;
    }
		++p;
	}
}

serial_port uart_open(const char* pcPortName)
{
  char acPortName[255];
  serial_port_windows* sp = malloc(sizeof(serial_port_windows));

  // Copy the input "com?" to "\\.\COM?" format
  sprintf(acPortName,"\\\\.\\%s",pcPortName);
  upcase(acPortName);

  // Try to open the serial port
  sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
  if (sp->hPort == INVALID_HANDLE_VALUE)
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  // Prepare the device control
  memset(&sp->dcb, 0, sizeof(DCB));
  sp->dcb.DCBlength = sizeof(DCB);
  if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb))
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  // Update the active serial port
  if(!SetCommState(sp->hPort,&sp->dcb))
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  sp->ct.ReadIntervalTimeout         = 0;
  sp->ct.ReadTotalTimeoutMultiplier  = 0;
  sp->ct.ReadTotalTimeoutConstant    = 30;
  sp->ct.WriteTotalTimeoutMultiplier = 0;
  sp->ct.WriteTotalTimeoutConstant   = 30;

  if(!SetCommTimeouts(sp->hPort,&sp->ct))
  {
    uart_close(sp);
    return INVALID_SERIAL_PORT;
  }

  PurgeComm(sp->hPort, PURGE_RXABORT | PURGE_RXCLEAR);

  return sp;
}

void uart_close(const serial_port sp)
{
  CloseHandle(((serial_port_windows*)sp)->hPort);
  free(sp);
}

void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
{
  serial_port_windows* spw;

  DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
  // Set port speed (Input and Output)
  switch(uiPortSpeed) {
    case 9600:
    case 19200:
    case 38400:
    case 57600:
    case 115200:
    case 230400:
    case 460800:
    break;
    default:
      ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
  };

  spw = (serial_port_windows*)sp;
  spw->dcb.BaudRate = uiPortSpeed;
  if (!SetCommState(spw->hPort, &spw->dcb))
  {
    ERR("Unable to apply new speed settings.");
  }
}

uint32_t uart_get_speed(const serial_port sp)
{
  const serial_port_windows* spw = (serial_port_windows*)sp;
  if (!GetCommState(spw->hPort, (serial_port)&spw->dcb))
    return spw->dcb.BaudRate;
  
  return 0;
}

bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
{
  ReadFile(((serial_port_windows*)sp)->hPort,pbtRx,*pszRxLen,(LPDWORD)pszRxLen,NULL);
  return (*pszRxLen != 0);
}

bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
{
  DWORD dwTxLen = 0;
  return WriteFile(((serial_port_windows*)sp)->hPort,pbtTx,szTxLen,&dwTxLen,NULL);
  return (dwTxLen != 0);
}

#endif
Commit	Line	Data
5bcc76c4	1	/*
	2	* Proxmark3 generic uart / rs232/ serial port library
	3	*
	4	* Copyright (c) 2012, Roel Verdult
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. Neither the name of the copyright holders nor the
	15	* names of its contributors may be used to endorse or promote products
	16	* derived from this software without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
	19	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	20	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	21	* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
	22	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	23	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	24	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	25	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	27	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	28	*
	29	* @file uart.c
	30	* @brief
	31	*
	32	* Partly based on uart-code written by Teunis van Beelen, available:
	33	* http://www.teuniz.net/RS-232/index.html
	34	*
	35	*/
	36
	37	#include "uart.h"
	38	#include "messages.h"
	39
	40	// Test if we are dealing with unix operating systems
	41	#ifndef _WIN32
	42
	43	#include <termios.h>
	44	typedef struct termios term_info;
	45	typedef struct {
	46	int fd; // Serial port file descriptor
	47	term_info tiOld; // Terminal info before using the port
	48	term_info tiNew; // Terminal info during the transaction
	49	} serial_port_unix;
	50
	51	// Set time-out on 30 miliseconds
	52	const struct timeval timeout = {
	53	.tv_sec = 0, // 0 second
	54	.tv_usec = 30000 // 30000 micro seconds
	55	};
	56
	57	// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
	58	#define CCLAIMED 0x80000000
	59
	60	serial_port uart_open(const char* pcPortName)
	61	{
	62	serial_port_unix* sp = malloc(sizeof(serial_port_unix));
	63
	64	if (sp == 0) return INVALID_SERIAL_PORT;
65
66	sp->fd = open(pcPortName, O_RDWR \| O_NOCTTY \| O_NDELAY \| O_NONBLOCK);
67	if(sp->fd == -1)
68	{
69	uart_close(sp);
70	return INVALID_SERIAL_PORT;
71	}
72
73	if(tcgetattr(sp->fd,&sp->tiOld) == -1)
74	{
75	uart_close(sp);
76	return INVALID_SERIAL_PORT;
77	}
78
79	// Make sure the port is not claimed already
80	if (sp->tiOld.c_iflag & CCLAIMED)
81	{
82	uart_close(sp);
83	return CLAIMED_SERIAL_PORT;
84	}
85
86	// Copy the old terminal info struct
87	sp->tiNew = sp->tiOld;
88
89	sp->tiNew.c_cflag = CS8 \| CLOCAL \| CREAD;
90	sp->tiNew.c_iflag = CCLAIMED \| IGNPAR;
91	sp->tiNew.c_oflag = 0;
92	sp->tiNew.c_lflag = 0;
93
94	sp->tiNew.c_cc[VMIN] = 0; // block until n bytes are received
95	sp->tiNew.c_cc[VTIME] = 0; // block until a timer expires (n * 100 mSec.)
96
97	if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1)
98	{
99	uart_close(sp);
100	return INVALID_SERIAL_PORT;
101	}
102
103	tcflush(sp->fd, TCIFLUSH);
104	return sp;
105	}
106
107	void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
108	{
109	DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
110	// Set port speed (Input and Output)
111	speed_t stPortSpeed = B9600;
112	switch(uiPortSpeed) {
113	case 9600: stPortSpeed = B9600;
114	break;
115	case 19200: stPortSpeed = B19200;
116	break;
117	case 38400: stPortSpeed = B38400;
118	break;
119	case 57600: stPortSpeed = B57600;
120	break;
121	case 115200: stPortSpeed = B115200;
122	break;
123	case 230400: stPortSpeed = B230400;
124	break;
125	#ifdef B460800
126	case 460800: stPortSpeed = B460800;
127	break;
128	#endif
129	default:
130	#ifdef B460800
131	ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
132	#else
133	ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200 or 230400.", uiPortSpeed);
134	#endif
135	};
136	const serial_port_unix* spu = (serial_port_unix*)sp;
137	cfsetispeed((struct termios*)&spu->tiNew, stPortSpeed);
138	cfsetospeed((struct termios*)&spu->tiNew, stPortSpeed);
139	if( tcsetattr(spu->fd, TCSADRAIN, &spu->tiNew) == -1)
140	{
141	ERR("Unable to apply new speed settings.");
142	}
143	}
144
145	uint32_t uart_get_speed(const serial_port sp)
146	{
147	uint32_t uiPortSpeed = 0;
148	const serial_port_unix* spu = (serial_port_unix*)sp;
149	switch (cfgetispeed(&spu->tiNew))
150	{
151	case B9600: uiPortSpeed = 9600;
152	break;
153	case B19200: uiPortSpeed = 19200;
154	break;
155	case B38400: uiPortSpeed = 38400;
156	break;
157	case B57600: uiPortSpeed = 57600;
158	break;
159	case B115200: uiPortSpeed = 115200;
160	break;
161	case B230400: uiPortSpeed = 230400;
162	break;
163	#ifdef B460800
164	case B460800: uiPortSpeed = 460800;
165	break;
166	#endif
167	}
168
169	return uiPortSpeed;
170	}
171
172	void uart_close(const serial_port sp)
173	{
174	tcsetattr(((serial_port_unix)sp)->fd,TCSANOW,&((serial_port_unix)sp)->tiOld);
175	close(((serial_port_unix*)sp)->fd);
176	free(sp);
177	}
178
179	bool uart_cts(const serial_port sp)
180	{
181	char status;
182	if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
183	return (status & TIOCM_CTS);
184	}
185
186	bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
187	{
188	int res;
189	int byteCount;
190	fd_set rfds;
191	struct timeval tv;
192
193	// Reset the output count
194	*pszRxLen = 0;
195
196	do {
197	// Reset file descriptor
198	FD_ZERO(&rfds);
199	FD_SET(((serial_port_unix*)sp)->fd,&rfds);
200	tv = timeout;
201	res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
202
203	// Read error
204	if (res < 0) {
205	DBG("RX error.");
206	return false;
207	}
208
209	// Read time-out
210	if (res == 0) {
211	if (*pszRxLen == 0) {
212	// Error, we received no data
213	DBG("RX time-out, buffer empty.");
214	return false;
215	} else {
216	// We received some data, but nothing more is available
217	return true;
218	}
219	}
220
221	// Retrieve the count of the incoming bytes
222	res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
223	if (res < 0) return false;
224
225	// There is something available, read the data
226	res = read(((serial_port_unix)sp)->fd,pbtRx+(pszRxLen),byteCount);
227
228	// Stop if the OS has some troubles reading the data
229	if (res <= 0) return false;
230
231	*pszRxLen += res;
232
233	} while (byteCount);
234
235	return true;
236	}
237
238	bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
239	{
240	int32_t res;
241	size_t szPos = 0;
242	fd_set rfds;
243	struct timeval tv;
244
245	while (szPos < szTxLen)
246	{
247	// Reset file descriptor
248	FD_ZERO(&rfds);
249	FD_SET(((serial_port_unix*)sp)->fd,&rfds);
250	tv = timeout;
251	res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
252
253	// Write error
254	if (res < 0) {
255	DBG("TX error.");
256	return false;
257	}
258
259	// Write time-out
260	if (res == 0) {
261	DBG("TX time-out.");
262	return false;
263	}
264
265	// Send away the bytes
266	res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
267
268	// Stop if the OS has some troubles sending the data
269	if (res <= 0) return false;
270
271	szPos += res;
272	}
273	return true;
274	}
275
276	#else
277	// The windows serial port implementation
278
279	typedef struct {
280	HANDLE hPort; // Serial port handle
281	DCB dcb; // Device control settings
282	COMMTIMEOUTS ct; // Serial port time-out configuration
283	} serial_port_windows;
284
a0bbdb76	285	void upcase(char *p) {
	286	while(*p != '\0') {
	287	if(p >= 97 && p <= 122) {
	288	*p -= 32;
	289	}
	290	++p;
	291	}
	292	}
	293
5bcc76c4	294	serial_port uart_open(const char* pcPortName)
	295	{
	296	char acPortName[255];
	297	serial_port_windows* sp = malloc(sizeof(serial_port_windows));
	298
	299	// Copy the input "com?" to "\\.\COM?" format
	300	sprintf(acPortName,"\\\\.\\%s",pcPortName);
a0bbdb76	301	upcase(acPortName);
5bcc76c4	302
	303	// Try to open the serial port
	304	sp->hPort = CreateFileA(acPortName,GENERIC_READ\|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
	305	if (sp->hPort == INVALID_HANDLE_VALUE)
	306	{
	307	uart_close(sp);
	308	return INVALID_SERIAL_PORT;
	309	}
	310
	311	// Prepare the device control
	312	memset(&sp->dcb, 0, sizeof(DCB));
	313	sp->dcb.DCBlength = sizeof(DCB);
	314	if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb))
	315	{
	316	uart_close(sp);
	317	return INVALID_SERIAL_PORT;
	318	}
	319
	320	// Update the active serial port
	321	if(!SetCommState(sp->hPort,&sp->dcb))
	322	{
	323	uart_close(sp);
	324	return INVALID_SERIAL_PORT;
	325	}
	326
	327	sp->ct.ReadIntervalTimeout = 0;
	328	sp->ct.ReadTotalTimeoutMultiplier = 0;
	329	sp->ct.ReadTotalTimeoutConstant = 30;
	330	sp->ct.WriteTotalTimeoutMultiplier = 0;
	331	sp->ct.WriteTotalTimeoutConstant = 30;
	332
	333	if(!SetCommTimeouts(sp->hPort,&sp->ct))
	334	{
	335	uart_close(sp);
	336	return INVALID_SERIAL_PORT;
	337	}
	338
	339	PurgeComm(sp->hPort, PURGE_RXABORT \| PURGE_RXCLEAR);
	340
	341	return sp;
	342	}
	343
	344	void uart_close(const serial_port sp)
	345	{
	346	CloseHandle(((serial_port_windows*)sp)->hPort);
	347	free(sp);
	348	}
	349
	350	void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
	351	{
	352	serial_port_windows* spw;
	353
	354	DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
	355	// Set port speed (Input and Output)
	356	switch(uiPortSpeed) {
	357	case 9600:
	358	case 19200:
	359	case 38400:
	360	case 57600:
	361	case 115200:
	362	case 230400:
	363	case 460800:
	364	break;
	365	default:
366	ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
367	};
368
369	spw = (serial_port_windows*)sp;
370	spw->dcb.BaudRate = uiPortSpeed;
371	if (!SetCommState(spw->hPort, &spw->dcb))
372	{
373	ERR("Unable to apply new speed settings.");
374	}
375	}
376
377	uint32_t uart_get_speed(const serial_port sp)
378	{
379	const serial_port_windows* spw = (serial_port_windows*)sp;
380	if (!GetCommState(spw->hPort, (serial_port)&spw->dcb))
381	return spw->dcb.BaudRate;
382
383	return 0;
384	}
385
386	bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
387	{
388	ReadFile(((serial_port_windows)sp)->hPort,pbtRx,pszRxLen,(LPDWORD)pszRxLen,NULL);
389	return (*pszRxLen != 0);
390	}
391
392	bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
393	{
394	DWORD dwTxLen = 0;
395	return WriteFile(((serial_port_windows*)sp)->hPort,pbtTx,szTxLen,&dwTxLen,NULL);
396	return (dwTxLen != 0);
397	}
398
399	#endif