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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 <stdlib.h> | |
26 | #include <string.h> | |
27 | ||
28 | #define LOG_PREFIX "scpi_serial" | |
29 | ||
30 | #define BUFFER_SIZE 1024 | |
31 | ||
32 | struct scpi_serial { | |
33 | struct sr_serial_dev_inst *serial; | |
34 | char buffer[BUFFER_SIZE]; | |
35 | size_t count; | |
36 | size_t read; | |
37 | }; | |
38 | ||
39 | static struct { | |
40 | uint16_t vendor_id; | |
41 | uint16_t product_id; | |
42 | const char *serialcomm; | |
43 | } scpi_serial_usb_ids[] = { | |
44 | { 0x0403, 0xed72, "115200/8n1/flow=1" }, /* Hameg HO720 */ | |
45 | { 0x0403, 0xed73, "115200/8n1/flow=1" }, /* Hameg HO730 */ | |
46 | }; | |
47 | ||
48 | static GSList *scpi_serial_scan(struct drv_context *drvc) | |
49 | { | |
50 | GSList *l, *r, *resources = NULL; | |
51 | gchar *res; | |
52 | unsigned i; | |
53 | ||
54 | (void)drvc; | |
55 | ||
56 | for (i = 0; i < ARRAY_SIZE(scpi_serial_usb_ids); i++) { | |
57 | if ((l = sr_serial_find_usb(scpi_serial_usb_ids[i].vendor_id, | |
58 | scpi_serial_usb_ids[i].product_id)) == NULL) | |
59 | continue; | |
60 | for (r = l; r; r = r->next) { | |
61 | if (scpi_serial_usb_ids[i].serialcomm) | |
62 | res = g_strdup_printf("%s:%s", (char *) r->data, | |
63 | scpi_serial_usb_ids[i].serialcomm); | |
64 | else | |
65 | res = g_strdup(r->data); | |
66 | resources = g_slist_append(resources, res); | |
67 | } | |
68 | g_slist_free_full(l, g_free); | |
69 | } | |
70 | ||
71 | return resources; | |
72 | } | |
73 | ||
74 | static int scpi_serial_dev_inst_new(void *priv, struct drv_context *drvc, | |
75 | const char *resource, char **params, const char *serialcomm) | |
76 | { | |
77 | struct scpi_serial *sscpi = priv; | |
78 | ||
79 | (void)drvc; | |
80 | (void)params; | |
81 | ||
82 | if (!(sscpi->serial = sr_serial_dev_inst_new(resource, serialcomm))) | |
83 | return SR_ERR; | |
84 | ||
85 | return SR_OK; | |
86 | } | |
87 | ||
88 | static int scpi_serial_open(void *priv) | |
89 | { | |
90 | struct scpi_serial *sscpi = priv; | |
91 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
92 | ||
93 | if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK) | |
94 | return SR_ERR; | |
95 | ||
96 | if (serial_flush(serial) != SR_OK) | |
97 | return SR_ERR; | |
98 | ||
99 | sscpi->count = 0; | |
100 | sscpi->read = 0; | |
101 | ||
102 | return SR_OK; | |
103 | } | |
104 | ||
105 | static int scpi_serial_source_add(struct sr_session *session, void *priv, | |
106 | int events, int timeout, sr_receive_data_callback cb, void *cb_data) | |
107 | { | |
108 | struct scpi_serial *sscpi = priv; | |
109 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
110 | ||
111 | return serial_source_add(session, serial, events, timeout, cb, cb_data); | |
112 | } | |
113 | ||
114 | static int scpi_serial_source_remove(struct sr_session *session, void *priv) | |
115 | { | |
116 | struct scpi_serial *sscpi = priv; | |
117 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
118 | ||
119 | return serial_source_remove(session, serial); | |
120 | } | |
121 | ||
122 | static int scpi_serial_send(void *priv, const char *command) | |
123 | { | |
124 | int len, result, written; | |
125 | gchar *terminated_command; | |
126 | struct scpi_serial *sscpi = priv; | |
127 | struct sr_serial_dev_inst *serial = sscpi->serial; | |
128 | ||
129 | terminated_command = g_strconcat(command, "\n", NULL); | |
130 | len = strlen(terminated_command); | |
131 | written = 0; | |
132 | while (written < len) { | |
133 | result = serial_write(serial, terminated_command + written, len - written); | |
134 | if (result < 0) { | |
135 | sr_err("Error while sending SCPI command: '%s'.", command); | |
136 | g_free(terminated_command); | |
137 | return SR_ERR; | |
138 | } | |
139 | written += result; | |
140 | } | |
141 | ||
142 | g_free(terminated_command); | |
143 | ||
144 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
145 | ||
146 | return SR_OK; | |
147 | } | |
148 | ||
149 | static int scpi_serial_read_begin(void *priv) | |
150 | { | |
151 | (void) priv; | |
152 | ||
153 | return SR_OK; | |
154 | } | |
155 | ||
156 | static int scpi_serial_read_data(void *priv, char *buf, int maxlen) | |
157 | { | |
158 | struct scpi_serial *sscpi = priv; | |
159 | int len, ret; | |
160 | ||
161 | len = BUFFER_SIZE - sscpi->count; | |
162 | ||
163 | /* Try to read new data into the buffer if there is space. */ | |
164 | if (len > 0) { | |
165 | ret = serial_read(sscpi->serial, sscpi->buffer + sscpi->read, | |
166 | BUFFER_SIZE - sscpi->count); | |
167 | ||
168 | if (ret < 0) | |
169 | return ret; | |
170 | ||
171 | sscpi->count += ret; | |
172 | ||
173 | if (ret > 0) | |
174 | sr_spew("Read %d bytes into buffer.", ret); | |
175 | } | |
176 | ||
177 | /* Return as many bytes as possible from buffer, excluding any trailing newline. */ | |
178 | if (sscpi->read < sscpi->count) { | |
179 | len = sscpi->count - sscpi->read; | |
180 | if (len > maxlen) | |
181 | len = maxlen; | |
182 | if (sscpi->buffer[sscpi->read + len - 1] == '\n') | |
183 | len--; | |
184 | sr_spew("Returning %d bytes from buffer.", len); | |
185 | memcpy(buf, sscpi->buffer + sscpi->read, len); | |
186 | sscpi->read += len; | |
187 | if (sscpi->read == BUFFER_SIZE) { | |
188 | sr_spew("Resetting buffer."); | |
189 | sscpi->count = 0; | |
190 | sscpi->read = 0; | |
191 | } | |
192 | return len; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int scpi_serial_read_complete(void *priv) | |
199 | { | |
200 | struct scpi_serial *sscpi = priv; | |
201 | ||
202 | /* If the next character is a newline, discard it and report complete. */ | |
203 | if (sscpi->read < sscpi->count && sscpi->buffer[sscpi->read] == '\n') { | |
204 | sscpi->read++; | |
205 | return 1; | |
206 | } else { | |
207 | return 0; | |
208 | } | |
209 | } | |
210 | ||
211 | static int scpi_serial_close(void *priv) | |
212 | { | |
213 | struct scpi_serial *sscpi = priv; | |
214 | ||
215 | return serial_close(sscpi->serial); | |
216 | } | |
217 | ||
218 | static void scpi_serial_free(void *priv) | |
219 | { | |
220 | struct scpi_serial *sscpi = priv; | |
221 | ||
222 | sr_serial_dev_inst_free(sscpi->serial); | |
223 | } | |
224 | ||
225 | SR_PRIV const struct sr_scpi_dev_inst scpi_serial_dev = { | |
226 | .name = "serial", | |
227 | .prefix = "", | |
228 | .priv_size = sizeof(struct scpi_serial), | |
229 | .scan = scpi_serial_scan, | |
230 | .dev_inst_new = scpi_serial_dev_inst_new, | |
231 | .open = scpi_serial_open, | |
232 | .source_add = scpi_serial_source_add, | |
233 | .source_remove = scpi_serial_source_remove, | |
234 | .send = scpi_serial_send, | |
235 | .read_begin = scpi_serial_read_begin, | |
236 | .read_data = scpi_serial_read_data, | |
237 | .read_complete = scpi_serial_read_complete, | |
238 | .close = scpi_serial_close, | |
239 | .free = scpi_serial_free, | |
240 | }; |