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4c938fc2 AJ |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Aurelien Jacobs <aurel@gnuage.org> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
6ec6c43b | 20 | #include <config.h> |
4c938fc2 AJ |
21 | #include <glib.h> |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
c1aae900 | 24 | #include <libsigrok/libsigrok.h> |
f54ebe0c | 25 | #include "libsigrok-internal.h" |
4c938fc2 AJ |
26 | |
27 | #define LOG_PREFIX "modbus_serial" | |
28 | ||
48b7c346 GS |
29 | #ifdef HAVE_SERIAL_COMM |
30 | ||
4c938fc2 AJ |
31 | #define BUFFER_SIZE 1024 |
32 | ||
33 | struct modbus_serial_rtu { | |
34 | struct sr_serial_dev_inst *serial; | |
35 | uint8_t slave_addr; | |
36 | uint16_t crc; | |
37 | }; | |
38 | ||
39 | static int modbus_serial_rtu_dev_inst_new(void *priv, const char *resource, | |
40 | char **params, const char *serialcomm, int modbusaddr) | |
41 | { | |
42 | struct modbus_serial_rtu *modbus = priv; | |
43 | ||
f54ebe0c | 44 | (void)params; |
4c938fc2 AJ |
45 | |
46 | modbus->serial = sr_serial_dev_inst_new(resource, serialcomm); | |
47 | modbus->slave_addr = modbusaddr; | |
48 | ||
49 | return SR_OK; | |
50 | } | |
51 | ||
52 | static int modbus_serial_rtu_open(void *priv) | |
53 | { | |
54 | struct modbus_serial_rtu *modbus = priv; | |
55 | struct sr_serial_dev_inst *serial = modbus->serial; | |
56 | ||
57 | if (serial_open(serial, SERIAL_RDWR) != SR_OK) | |
58 | return SR_ERR; | |
59 | ||
60 | if (serial_flush(serial) != SR_OK) | |
61 | return SR_ERR; | |
62 | ||
63 | return SR_OK; | |
64 | } | |
65 | ||
66 | static int modbus_serial_rtu_source_add(struct sr_session *session, void *priv, | |
67 | int events, int timeout, sr_receive_data_callback cb, void *cb_data) | |
68 | { | |
69 | struct modbus_serial_rtu *modbus = priv; | |
70 | struct sr_serial_dev_inst *serial = modbus->serial; | |
71 | ||
72 | return serial_source_add(session, serial, events, timeout, cb, cb_data); | |
73 | } | |
74 | ||
75 | static int modbus_serial_rtu_source_remove(struct sr_session *session, | |
76 | void *priv) | |
77 | { | |
78 | struct modbus_serial_rtu *modbus = priv; | |
79 | struct sr_serial_dev_inst *serial = modbus->serial; | |
80 | ||
81 | return serial_source_remove(session, serial); | |
82 | } | |
83 | ||
4c938fc2 AJ |
84 | static int modbus_serial_rtu_send(void *priv, |
85 | const uint8_t *buffer, int buffer_size) | |
86 | { | |
87 | int result; | |
88 | struct modbus_serial_rtu *modbus = priv; | |
89 | struct sr_serial_dev_inst *serial = modbus->serial; | |
90 | uint8_t slave_addr = modbus->slave_addr; | |
91 | uint16_t crc; | |
92 | ||
379e95c5 | 93 | result = serial_write_blocking(serial, &slave_addr, sizeof(slave_addr), 0); |
4c938fc2 | 94 | if (result < 0) |
7b50a9b8 | 95 | return SR_ERR; |
4c938fc2 | 96 | |
379e95c5 | 97 | result = serial_write_blocking(serial, buffer, buffer_size, 0); |
4c938fc2 | 98 | if (result < 0) |
7b50a9b8 | 99 | return SR_ERR; |
4c938fc2 | 100 | |
4ea012bd AS |
101 | crc = sr_crc16(SR_CRC16_DEFAULT_INIT, &slave_addr, sizeof(slave_addr)); |
102 | crc = sr_crc16(crc, buffer, buffer_size); | |
4c938fc2 | 103 | |
379e95c5 | 104 | result = serial_write_blocking(serial, &crc, sizeof(crc), 0); |
4c938fc2 | 105 | if (result < 0) |
7b50a9b8 | 106 | return SR_ERR; |
4c938fc2 AJ |
107 | |
108 | return SR_OK; | |
109 | } | |
110 | ||
111 | static int modbus_serial_rtu_read_begin(void *priv, uint8_t *function_code) | |
112 | { | |
113 | struct modbus_serial_rtu *modbus = priv; | |
114 | uint8_t slave_addr; | |
115 | int ret; | |
116 | ||
d4e07017 | 117 | ret = serial_read_blocking(modbus->serial, &slave_addr, 1, 500); |
4c938fc2 | 118 | if (ret != 1 || slave_addr != modbus->slave_addr) |
7b50a9b8 | 119 | return SR_ERR; |
4c938fc2 AJ |
120 | |
121 | ret = serial_read_blocking(modbus->serial, function_code, 1, 100); | |
122 | if (ret != 1) | |
7b50a9b8 | 123 | return SR_ERR; |
4c938fc2 | 124 | |
4ea012bd AS |
125 | modbus->crc = sr_crc16(SR_CRC16_DEFAULT_INIT, &slave_addr, sizeof(slave_addr)); |
126 | modbus->crc = sr_crc16(modbus->crc, function_code, 1); | |
4c938fc2 AJ |
127 | |
128 | return SR_OK; | |
129 | } | |
130 | ||
131 | static int modbus_serial_rtu_read_data(void *priv, uint8_t *buf, int maxlen) | |
132 | { | |
133 | struct modbus_serial_rtu *modbus = priv; | |
134 | int ret; | |
135 | ||
176d785d | 136 | ret = serial_read_nonblocking(modbus->serial, buf, maxlen); |
4c938fc2 AJ |
137 | if (ret < 0) |
138 | return ret; | |
4ea012bd | 139 | modbus->crc = sr_crc16(modbus->crc, buf, ret); |
176d785d | 140 | return ret; |
4c938fc2 AJ |
141 | } |
142 | ||
143 | static int modbus_serial_rtu_read_end(void *priv) | |
144 | { | |
145 | struct modbus_serial_rtu *modbus = priv; | |
146 | uint16_t crc; | |
147 | int ret; | |
148 | ||
149 | ret = serial_read_blocking(modbus->serial, &crc, sizeof(crc), 100); | |
150 | if (ret != 2) | |
7b50a9b8 | 151 | return SR_ERR; |
4c938fc2 AJ |
152 | |
153 | if (crc != modbus->crc) { | |
154 | sr_err("CRC error (0x%04X vs 0x%04X).", crc, modbus->crc); | |
155 | return SR_ERR_DATA; | |
156 | } | |
157 | ||
158 | return SR_OK; | |
159 | } | |
160 | ||
161 | static int modbus_serial_rtu_close(void *priv) | |
162 | { | |
163 | struct modbus_serial_rtu *modbus = priv; | |
164 | ||
165 | return serial_close(modbus->serial); | |
166 | } | |
167 | ||
168 | static void modbus_serial_rtu_free(void *priv) | |
169 | { | |
170 | struct modbus_serial_rtu *modbus = priv; | |
171 | ||
172 | sr_serial_dev_inst_free(modbus->serial); | |
173 | } | |
174 | ||
175 | SR_PRIV const struct sr_modbus_dev_inst modbus_serial_rtu_dev = { | |
176 | .name = "serial_rtu", | |
177 | .prefix = "", | |
178 | .priv_size = sizeof(struct modbus_serial_rtu), | |
179 | .scan = NULL, | |
180 | .dev_inst_new = modbus_serial_rtu_dev_inst_new, | |
181 | .open = modbus_serial_rtu_open, | |
182 | .source_add = modbus_serial_rtu_source_add, | |
183 | .source_remove = modbus_serial_rtu_source_remove, | |
184 | .send = modbus_serial_rtu_send, | |
185 | .read_begin = modbus_serial_rtu_read_begin, | |
186 | .read_data = modbus_serial_rtu_read_data, | |
187 | .read_end = modbus_serial_rtu_read_end, | |
188 | .close = modbus_serial_rtu_close, | |
189 | .free = modbus_serial_rtu_free, | |
190 | }; | |
48b7c346 GS |
191 | |
192 | #endif |