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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com> | |
5 | * Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include "libsigrok.h" | |
22 | #include "libsigrok-internal.h" | |
23 | ||
24 | #include <glib.h> | |
25 | #include <string.h> | |
26 | ||
27 | #define LOG_PREFIX "scpi_serial" | |
28 | ||
29 | #define BUFFER_SIZE 1024 | |
30 | ||
31 | struct scpi_serial { | |
32 | struct sr_serial_dev_inst *serial; | |
33 | char buffer[BUFFER_SIZE]; | |
34 | size_t count; | |
35 | size_t read; | |
36 | }; | |
37 | ||
38 | static int scpi_serial_dev_inst_new(void *priv, struct drv_context *drvc, | |
39 | const char *resource, char **params, const char *serialcomm) | |
40 | { | |
41 | struct scpi_serial *sscpi = priv; | |
42 | ||
43 | (void)drvc; | |
44 | (void)params; | |
45 | ||
46 | if (!(sscpi->serial = sr_serial_dev_inst_new(resource, serialcomm))) | |
47 | return SR_ERR; | |
48 | ||
49 | return SR_OK; | |
50 | } | |
51 | ||
52 | static int scpi_serial_open(void *priv) | |
53 | { | |
54 | struct scpi_serial *sscpi = priv; | |
55 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
56 | ||
57 | if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK) | |
58 | return SR_ERR; | |
59 | ||
60 | if (serial_flush(serial) != SR_OK) | |
61 | return SR_ERR; | |
62 | ||
63 | sscpi->count = 0; | |
64 | sscpi->read = 0; | |
65 | ||
66 | return SR_OK; | |
67 | } | |
68 | ||
69 | static int scpi_serial_source_add(void *priv, int events, int timeout, | |
70 | sr_receive_data_callback_t cb, void *cb_data) | |
71 | { | |
72 | struct scpi_serial *sscpi = priv; | |
73 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
74 | ||
75 | return serial_source_add(serial, events, timeout, cb, cb_data); | |
76 | } | |
77 | ||
78 | static int scpi_serial_source_remove(void *priv) | |
79 | { | |
80 | struct scpi_serial *sscpi = priv; | |
81 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
82 | ||
83 | return serial_source_remove(serial); | |
84 | } | |
85 | ||
86 | static int scpi_serial_send(void *priv, const char *command) | |
87 | { | |
88 | int len, result, written; | |
89 | gchar *terminated_command; | |
90 | struct scpi_serial *sscpi = priv; | |
91 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
92 | ||
93 | terminated_command = g_strconcat(command, "\n", NULL); | |
94 | len = strlen(terminated_command); | |
95 | written = 0; | |
96 | while (written < len) { | |
97 | result = serial_write(serial, terminated_command + written, len - written); | |
98 | if (result < 0) { | |
99 | sr_err("Error while sending SCPI command: '%s'.", command); | |
100 | g_free(terminated_command); | |
101 | return SR_ERR; | |
102 | } | |
103 | written += result; | |
104 | } | |
105 | ||
106 | g_free(terminated_command); | |
107 | ||
108 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
109 | ||
110 | return SR_OK; | |
111 | } | |
112 | ||
113 | static int scpi_serial_read_begin(void *priv) | |
114 | { | |
115 | (void) priv; | |
116 | ||
117 | return SR_OK; | |
118 | } | |
119 | ||
120 | static int scpi_serial_read_data(void *priv, char *buf, int maxlen) | |
121 | { | |
122 | struct scpi_serial *sscpi = priv; | |
123 | int len, ret; | |
124 | ||
125 | len = BUFFER_SIZE - sscpi->count; | |
126 | ||
127 | /* Try to read new data into the buffer if there is space. */ | |
128 | if (len > 0) { | |
129 | ret = serial_read(sscpi->serial, sscpi->buffer + sscpi->read, | |
130 | BUFFER_SIZE - sscpi->count); | |
131 | ||
132 | if (ret < 0) | |
133 | return ret; | |
134 | ||
135 | sscpi->count += ret; | |
136 | ||
137 | if (ret > 0) | |
138 | sr_spew("Read %d bytes into buffer.", ret); | |
139 | } | |
140 | ||
141 | /* Return as many bytes as possible from buffer, excluding any trailing newline. */ | |
142 | if (sscpi->read < sscpi->count) { | |
143 | len = sscpi->count - sscpi->read; | |
144 | if (len > maxlen) | |
145 | len = maxlen; | |
146 | if (sscpi->buffer[sscpi->read + len - 1] == '\n') | |
147 | len--; | |
148 | sr_spew("Returning %d bytes from buffer.", len); | |
149 | memcpy(buf, sscpi->buffer + sscpi->read, len); | |
150 | sscpi->read += len; | |
151 | if (sscpi->read == BUFFER_SIZE) { | |
152 | sr_spew("Resetting buffer."); | |
153 | sscpi->count = 0; | |
154 | sscpi->read = 0; | |
155 | } | |
156 | return len; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int scpi_serial_read_complete(void *priv) | |
163 | { | |
164 | struct scpi_serial *sscpi = priv; | |
165 | ||
166 | /* If the next character is a newline, discard it and report complete. */ | |
167 | if (sscpi->read < sscpi->count && sscpi->buffer[sscpi->read] == '\n') { | |
168 | sscpi->read++; | |
169 | return 1; | |
170 | } else { | |
171 | return 0; | |
172 | } | |
173 | } | |
174 | ||
175 | static int scpi_serial_close(void *priv) | |
176 | { | |
177 | struct scpi_serial *sscpi = priv; | |
178 | ||
179 | return serial_close(sscpi->serial); | |
180 | } | |
181 | ||
182 | static void scpi_serial_free(void *priv) | |
183 | { | |
184 | struct scpi_serial *sscpi = priv; | |
185 | ||
186 | sr_serial_dev_inst_free(sscpi->serial); | |
187 | } | |
188 | ||
189 | SR_PRIV const struct sr_scpi_dev_inst scpi_serial_dev = { | |
190 | .name = "serial", | |
191 | .prefix = "", | |
192 | .priv_size = sizeof(struct scpi_serial), | |
193 | .dev_inst_new = scpi_serial_dev_inst_new, | |
194 | .open = scpi_serial_open, | |
195 | .source_add = scpi_serial_source_add, | |
196 | .source_remove = scpi_serial_source_remove, | |
197 | .send = scpi_serial_send, | |
198 | .read_begin = scpi_serial_read_begin, | |
199 | .read_data = scpi_serial_read_data, | |
200 | .read_complete = scpi_serial_read_complete, | |
201 | .close = scpi_serial_close, | |
202 | .free = scpi_serial_free, | |
203 | }; |