2 * Generic uart / rs232/ serial port library
4 * Copyright (c) 2013, Roel Verdult
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.
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.
31 * Note: the win32 version of this library has also been seen under the GPLv3+
32 * license as part of the libnfc project, which appears to have additional
35 * This version of the library has functionality removed which was not used by
41 // The windows serial port implementation
46 HANDLE hPort
; // Serial port handle
47 DCB dcb
; // Device control settings
48 COMMTIMEOUTS ct
; // Serial port time-out configuration
49 } serial_port_windows
;
51 void upcase(char *p
) {
53 if(*p
>= 97 && *p
<= 122) {
60 serial_port
uart_open(const char* pcPortName
) {
62 serial_port_windows
* sp
= malloc(sizeof(serial_port_windows
));
64 // Copy the input "com?" to "\\.\COM?" format
65 sprintf(acPortName
,"\\\\.\\%s",pcPortName
);
68 // Try to open the serial port
69 sp
->hPort
= CreateFileA(acPortName
,GENERIC_READ
|GENERIC_WRITE
,0,NULL
,OPEN_EXISTING
,0,NULL
);
70 if (sp
->hPort
== INVALID_HANDLE_VALUE
) {
72 return INVALID_SERIAL_PORT
;
75 // Prepare the device control
76 memset(&sp
->dcb
, 0, sizeof(DCB
));
77 sp
->dcb
.DCBlength
= sizeof(DCB
);
78 if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp
->dcb
)) {
80 return INVALID_SERIAL_PORT
;
83 // Update the active serial port
84 if(!SetCommState(sp
->hPort
,&sp
->dcb
)) {
86 return INVALID_SERIAL_PORT
;
89 sp
->ct
.ReadIntervalTimeout
= 0;
90 sp
->ct
.ReadTotalTimeoutMultiplier
= 0;
91 sp
->ct
.ReadTotalTimeoutConstant
= 30;
92 sp
->ct
.WriteTotalTimeoutMultiplier
= 0;
93 sp
->ct
.WriteTotalTimeoutConstant
= 30;
95 if(!SetCommTimeouts(sp
->hPort
,&sp
->ct
)) {
97 return INVALID_SERIAL_PORT
;
100 PurgeComm(sp
->hPort
, PURGE_RXABORT
| PURGE_RXCLEAR
);
105 void uart_close(const serial_port sp
) {
106 CloseHandle(((serial_port_windows
*)sp
)->hPort
);
110 bool uart_receive(const serial_port sp
, byte_t
*pbtRx
, size_t pszMaxRxLen
, size_t *pszRxLen
) {
111 return ReadFile(((serial_port_windows
*)sp
)->hPort
, pbtRx
, pszMaxRxLen
, (LPDWORD
)pszRxLen
, NULL
);
114 bool uart_send(const serial_port sp
, const byte_t
* pbtTx
, const size_t szTxLen
) {
116 return WriteFile(((serial_port_windows
*)sp
)->hPort
, pbtTx
, szTxLen
, &dwTxLen
, NULL
);
119 bool uart_set_speed(serial_port sp
, const uint32_t uiPortSpeed
) {
120 serial_port_windows
* spw
;
121 spw
= (serial_port_windows
*)sp
;
122 spw
->dcb
.BaudRate
= uiPortSpeed
;
123 return SetCommState(spw
->hPort
, &spw
->dcb
);
126 uint32_t uart_get_speed(const serial_port sp
) {
127 const serial_port_windows
* spw
= (serial_port_windows
*)sp
;
128 if (!GetCommState(spw
->hPort
, (serial_port
)&spw
->dcb
)) {
129 return spw
->dcb
.BaudRate
;