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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 <glib.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <libsigrok/libsigrok.h> | |
25 | #include "libsigrok-internal.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 const struct { | |
39 | uint16_t vendor_id; | |
40 | uint16_t product_id; | |
41 | const char *serialcomm; | |
42 | } scpi_serial_usb_ids[] = { | |
43 | { 0x0403, 0xed72, "115200/8n1/flow=1" }, /* Hameg HO720 */ | |
44 | { 0x0403, 0xed73, "115200/8n1/flow=1" }, /* Hameg HO730 */ | |
45 | }; | |
46 | ||
47 | static GSList *scpi_serial_scan(struct drv_context *drvc) | |
48 | { | |
49 | GSList *l, *r, *resources = NULL; | |
50 | gchar *res; | |
51 | unsigned i; | |
52 | ||
53 | (void)drvc; | |
54 | ||
55 | for (i = 0; i < ARRAY_SIZE(scpi_serial_usb_ids); i++) { | |
56 | if (!(l = sr_serial_find_usb(scpi_serial_usb_ids[i].vendor_id, | |
57 | scpi_serial_usb_ids[i].product_id))) | |
58 | continue; | |
59 | for (r = l; r; r = r->next) { | |
60 | if (scpi_serial_usb_ids[i].serialcomm) | |
61 | res = g_strdup_printf("%s:%s", (char *) r->data, | |
62 | scpi_serial_usb_ids[i].serialcomm); | |
63 | else | |
64 | res = g_strdup(r->data); | |
65 | resources = g_slist_append(resources, res); | |
66 | } | |
67 | g_slist_free_full(l, g_free); | |
68 | } | |
69 | ||
70 | return resources; | |
71 | } | |
72 | ||
73 | static int scpi_serial_dev_inst_new(void *priv, struct drv_context *drvc, | |
74 | const char *resource, char **params, const char *serialcomm) | |
75 | { | |
76 | struct scpi_serial *sscpi = priv; | |
77 | ||
78 | (void)drvc; | |
79 | (void)params; | |
80 | ||
81 | sscpi->serial = sr_serial_dev_inst_new(resource, serialcomm); | |
82 | ||
83 | return SR_OK; | |
84 | } | |
85 | ||
86 | static int scpi_serial_open(void *priv) | |
87 | { | |
88 | struct scpi_serial *sscpi = priv; | |
89 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
90 | ||
91 | if (serial_open(serial, SERIAL_RDWR) != SR_OK) | |
92 | return SR_ERR; | |
93 | ||
94 | if (serial_flush(serial) != SR_OK) | |
95 | return SR_ERR; | |
96 | ||
97 | sscpi->count = 0; | |
98 | sscpi->read = 0; | |
99 | ||
100 | return SR_OK; | |
101 | } | |
102 | ||
103 | static int scpi_serial_source_add(struct sr_session *session, void *priv, | |
104 | int events, int timeout, sr_receive_data_callback cb, void *cb_data) | |
105 | { | |
106 | struct scpi_serial *sscpi = priv; | |
107 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
108 | ||
109 | return serial_source_add(session, serial, events, timeout, cb, cb_data); | |
110 | } | |
111 | ||
112 | static int scpi_serial_source_remove(struct sr_session *session, void *priv) | |
113 | { | |
114 | struct scpi_serial *sscpi = priv; | |
115 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
116 | ||
117 | return serial_source_remove(session, serial); | |
118 | } | |
119 | ||
120 | static int scpi_serial_send(void *priv, const char *command) | |
121 | { | |
122 | int len, result, written; | |
123 | gchar *terminated_command; | |
124 | struct scpi_serial *sscpi = priv; | |
125 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
126 | ||
127 | terminated_command = g_strconcat(command, "\n", NULL); | |
128 | len = strlen(terminated_command); | |
129 | written = 0; | |
130 | while (written < len) { | |
131 | result = serial_write_nonblocking(serial, | |
132 | terminated_command + written, len - written); | |
133 | if (result < 0) { | |
134 | sr_err("Error while sending SCPI command: '%s'.", command); | |
135 | g_free(terminated_command); | |
136 | return SR_ERR; | |
137 | } | |
138 | written += result; | |
139 | } | |
140 | ||
141 | g_free(terminated_command); | |
142 | ||
143 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
144 | ||
145 | return SR_OK; | |
146 | } | |
147 | ||
148 | static int scpi_serial_read_begin(void *priv) | |
149 | { | |
150 | (void) priv; | |
151 | ||
152 | return SR_OK; | |
153 | } | |
154 | ||
155 | static int scpi_serial_read_data(void *priv, char *buf, int maxlen) | |
156 | { | |
157 | struct scpi_serial *sscpi = priv; | |
158 | int len, ret; | |
159 | ||
160 | len = BUFFER_SIZE - sscpi->count; | |
161 | ||
162 | /* Try to read new data into the buffer if there is space. */ | |
163 | if (len > 0) { | |
164 | ret = serial_read_nonblocking(sscpi->serial, sscpi->buffer + sscpi->read, | |
165 | BUFFER_SIZE - sscpi->count); | |
166 | ||
167 | if (ret < 0) | |
168 | return ret; | |
169 | ||
170 | sscpi->count += ret; | |
171 | ||
172 | if (ret > 0) | |
173 | sr_spew("Read %d bytes into buffer.", ret); | |
174 | } | |
175 | ||
176 | /* Return as many bytes as possible from buffer, excluding any trailing newline. */ | |
177 | if (sscpi->read < sscpi->count) { | |
178 | len = sscpi->count - sscpi->read; | |
179 | if (len > maxlen) | |
180 | len = maxlen; | |
181 | if (sscpi->buffer[sscpi->read + len - 1] == '\n') | |
182 | len--; | |
183 | sr_spew("Returning %d bytes from buffer.", len); | |
184 | memcpy(buf, sscpi->buffer + sscpi->read, len); | |
185 | sscpi->read += len; | |
186 | if (sscpi->read == BUFFER_SIZE) { | |
187 | sr_spew("Resetting buffer."); | |
188 | sscpi->count = 0; | |
189 | sscpi->read = 0; | |
190 | } | |
191 | return len; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int scpi_serial_read_complete(void *priv) | |
198 | { | |
199 | struct scpi_serial *sscpi = priv; | |
200 | ||
201 | /* If the next character is a newline, discard it and report complete. */ | |
202 | if (sscpi->read < sscpi->count && sscpi->buffer[sscpi->read] == '\n') { | |
203 | sscpi->read++; | |
204 | return 1; | |
205 | } else { | |
206 | return 0; | |
207 | } | |
208 | } | |
209 | ||
210 | static int scpi_serial_close(void *priv) | |
211 | { | |
212 | struct scpi_serial *sscpi = priv; | |
213 | ||
214 | return serial_close(sscpi->serial); | |
215 | } | |
216 | ||
217 | static void scpi_serial_free(void *priv) | |
218 | { | |
219 | struct scpi_serial *sscpi = priv; | |
220 | ||
221 | sr_serial_dev_inst_free(sscpi->serial); | |
222 | } | |
223 | ||
224 | SR_PRIV const struct sr_scpi_dev_inst scpi_serial_dev = { | |
225 | .name = "serial", | |
226 | .prefix = "", | |
227 | .priv_size = sizeof(struct scpi_serial), | |
228 | .scan = scpi_serial_scan, | |
229 | .dev_inst_new = scpi_serial_dev_inst_new, | |
230 | .open = scpi_serial_open, | |
231 | .source_add = scpi_serial_source_add, | |
232 | .source_remove = scpi_serial_source_remove, | |
233 | .send = scpi_serial_send, | |
234 | .read_begin = scpi_serial_read_begin, | |
235 | .read_data = scpi_serial_read_data, | |
236 | .read_complete = scpi_serial_read_complete, | |
237 | .close = scpi_serial_close, | |
238 | .free = scpi_serial_free, | |
239 | }; |