1 /*
2  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without modification,
6  * are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  *    this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  *    this list of conditions and the following disclaimer in the documentation
12  *    and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25  * OF SUCH DAMAGE.
26  *
27  * This file is part of the lwIP TCP/IP stack.
28  */
29 
30 /*
31  * This is the interface to the platform specific serial IO module
32  * It needs to be implemented by those platforms which need SLIP or PPP
33  */
34 
35 #ifndef __SIO_H__
36 #define __SIO_H__
37 
38 #include "lwip/arch.h"
39 
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43 
44 /* If you want to define sio_fd_t elsewhere or differently,
45    define this in your cc.h file. */
46 #ifndef __sio_fd_t_defined
47 typedef void * sio_fd_t;
48 #endif
49 
50 /* The following functions can be defined to something else in your cc.h file
51    or be implemented in your custom sio.c file. */
52 
53 #ifndef sio_open
54 /**
55  * Opens a serial device for communication.
56  *
57  * @param devnum device number
58  * @return handle to serial device if successful, NULL otherwise
59  */
60 sio_fd_t sio_open(u8_t devnum);
61 #endif
62 
63 #ifndef sio_send
64 /**
65  * Sends a single character to the serial device.
66  *
67  * @param c character to send
68  * @param fd serial device handle
69  *
70  * @note This function will block until the character can be sent.
71  */
72 void sio_send(u8_t c, sio_fd_t fd);
73 #endif
74 
75 #ifndef sio_recv
76 /**
77  * Receives a single character from the serial device.
78  *
79  * @param fd serial device handle
80  *
81  * @note This function will block until a character is received.
82  */
83 u8_t sio_recv(sio_fd_t fd);
84 #endif
85 
86 #ifndef sio_read
87 /**
88  * Reads from the serial device.
89  *
90  * @param fd serial device handle
91  * @param data pointer to data buffer for receiving
92  * @param len maximum length (in bytes) of data to receive
93  * @return number of bytes actually received - may be 0 if aborted by sio_read_abort
94  *
95  * @note This function will block until data can be received. The blocking
96  * can be cancelled by calling sio_read_abort().
97  */
98 u32_t sio_read(sio_fd_t fd, u8_t *data, u32_t len);
99 #endif
100 
101 #ifndef sio_tryread
102 /**
103  * Tries to read from the serial device. Same as sio_read but returns
104  * immediately if no data is available and never blocks.
105  *
106  * @param fd serial device handle
107  * @param data pointer to data buffer for receiving
108  * @param len maximum length (in bytes) of data to receive
109  * @return number of bytes actually received
110  */
111 u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len);
112 #endif
113 
114 #ifndef sio_write
115 /**
116  * Writes to the serial device.
117  *
118  * @param fd serial device handle
119  * @param data pointer to data to send
120  * @param len length (in bytes) of data to send
121  * @return number of bytes actually sent
122  *
123  * @note This function will block until all data can be sent.
124  */
125 u32_t sio_write(sio_fd_t fd, u8_t *data, u32_t len);
126 #endif
127 
128 #ifndef sio_read_abort
129 /**
130  * Aborts a blocking sio_read() call.
131  *
132  * @param fd serial device handle
133  */
134 void sio_read_abort(sio_fd_t fd);
135 #endif
136 
137 #ifdef __cplusplus
138 }
139 #endif
140 
141 #endif /* __SIO_H__ */
142