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7b9d7320 DJ |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com> | |
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 | ||
20 | #include "libsigrok.h" | |
21 | #include "libsigrok-internal.h" | |
22 | ||
23 | #include <glib.h> | |
24 | #include <string.h> | |
25 | ||
26 | /* Message logging helpers with subsystem-specific prefix string. */ | |
27 | #define LOG_PREFIX "scpi: " | |
28 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
29 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
30 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
31 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
32 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
33 | ||
34 | #define SCPI_READ_RETRIES 100 | |
35 | #define SCPI_READ_RETRY_TIMEOUT 10000 | |
36 | ||
aa1e3b40 DJ |
37 | /** |
38 | * Parse a string representation of a boolean-like value into a gboolean. | |
39 | * Similar to sr_parse_boolstring but rejects strings which do not represent | |
40 | * a boolean-like value. | |
41 | * | |
42 | * @param str String to convert. | |
43 | * @param ret Pointer to a gboolean where the result of the conversion will be | |
44 | * stored. | |
45 | * | |
46 | * @return SR_OK on success, SR_ERR on failure. | |
47 | */ | |
48 | static int sr_parse_strict_bool(const char *str, gboolean *ret) | |
49 | { | |
50 | if (!str) | |
51 | return SR_ERR_ARG; | |
52 | ||
53 | if (!g_strcmp0(str, "1") || | |
54 | !g_ascii_strncasecmp(str, "y", 1) || | |
55 | !g_ascii_strncasecmp(str, "t", 1) || | |
56 | !g_ascii_strncasecmp(str, "yes", 3) || | |
57 | !g_ascii_strncasecmp(str, "true", 4) || | |
58 | !g_ascii_strncasecmp(str, "on", 2)) { | |
59 | ||
60 | *ret = TRUE; | |
61 | return SR_OK; | |
62 | ||
63 | } else if (!g_strcmp0(str, "0") || | |
64 | !g_ascii_strncasecmp(str, "n", 1) || | |
65 | !g_ascii_strncasecmp(str, "f", 1) || | |
66 | !g_ascii_strncasecmp(str, "no", 2) || | |
67 | !g_ascii_strncasecmp(str, "false", 5) || | |
68 | !g_ascii_strncasecmp(str, "off", 3)) { | |
69 | ||
70 | *ret = FALSE; | |
71 | return SR_OK; | |
72 | } | |
73 | ||
74 | return SR_ERR; | |
75 | } | |
76 | ||
7b9d7320 DJ |
77 | /** |
78 | * Send a SCPI command. | |
79 | * | |
80 | * @param serial Previously initialized serial port structure. | |
81 | * @param command The SCPI command to send to the device. | |
82 | * | |
83 | * @return SR_OK on success, SR_ERR on failure. | |
84 | */ | |
85 | SR_PRIV int sr_scpi_send(struct sr_serial_dev_inst *serial, | |
86 | const char *command) | |
87 | { | |
88 | int len; | |
89 | int out; | |
90 | gchar *terminated_command; | |
91 | ||
92 | terminated_command = g_strconcat(command, "\n", NULL); | |
93 | len = strlen(terminated_command); | |
94 | ||
95 | out = serial_write(serial, terminated_command, | |
96 | strlen(terminated_command)); | |
97 | ||
98 | g_free(terminated_command); | |
99 | ||
100 | if (out != len) { | |
101 | sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out, | |
102 | len, command); | |
103 | return SR_ERR; | |
104 | } | |
105 | ||
106 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
107 | ||
108 | return SR_OK; | |
109 | } | |
110 | ||
111 | /** | |
112 | * Send a SCPI command, receive the reply and store the reply in scpi_response. | |
113 | * | |
114 | * @param serial Previously initialized serial port structure. | |
115 | * @param command The SCPI command to send to the device (can be NULL). | |
116 | * @param scpi_response Pointer where to store the scpi response. | |
117 | * | |
118 | * @return SR_OK upon fetching a full SCPI response, SR_ERR upon fetching a | |
119 | * incomplete or no response. The allocated response must be freed by the caller | |
120 | * in the case of a full response as well in the case of an incomplete. | |
121 | */ | |
122 | SR_PRIV int sr_scpi_get_string(struct sr_serial_dev_inst *serial, | |
123 | const char *command, char **scpi_response) | |
124 | { | |
125 | int len; | |
126 | int ret; | |
127 | char buf[256]; | |
128 | unsigned int i; | |
129 | GString *response; | |
130 | ||
131 | if (command) | |
132 | if (sr_scpi_send(serial, command) != SR_OK) | |
133 | return SR_ERR; | |
134 | ||
135 | response = g_string_sized_new(1024); | |
136 | ||
137 | for (i = 0; i <= SCPI_READ_RETRIES; i++) { | |
138 | while ((len = serial_read(serial, buf, sizeof(buf))) > 0) | |
139 | response = g_string_append_len(response, buf, len); | |
140 | ||
141 | if (response->len > 0 && | |
142 | response->str[response->len-1] == '\n') { | |
143 | sr_spew("Fetched full SCPI response"); | |
144 | break; | |
145 | } | |
146 | ||
147 | g_usleep(SCPI_READ_RETRY_TIMEOUT); | |
148 | } | |
149 | ||
150 | if (response->len == 0) { | |
151 | sr_dbg("No SCPI response received"); | |
152 | g_string_free(response, TRUE); | |
153 | *scpi_response = NULL; | |
154 | return SR_ERR; | |
155 | ||
156 | } else if (response->str[response->len-1] == '\n') { | |
157 | /* | |
158 | * The SCPI response contains a LF ('\n') at the end and we | |
159 | * don't need this so replace it with a '\0' and decrement | |
160 | * the length. | |
161 | */ | |
162 | response->str[--response->len] = '\0'; | |
163 | ret = SR_OK; | |
164 | ||
165 | } else { | |
166 | sr_warn("Incomplete SCPI response received!"); | |
167 | ret = SR_ERR; | |
168 | } | |
169 | ||
170 | /* Minor optimization: steal the string instead of copying. */ | |
171 | *scpi_response = response->str; | |
172 | ||
173 | /* A SCPI response can be quite large, print at most 50 characters */ | |
174 | sr_dbg("SCPI response for command %s received (length %d): '%.50s'", | |
175 | command, response->len, response->str); | |
176 | ||
177 | g_string_free(response, FALSE); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | /** | |
183 | * Send the *IDN? SCPI command, receive the reply, parse it and store the | |
184 | * reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer. | |
185 | * | |
186 | * @param serial Previously initialized serial port structure. | |
187 | * @param scpi_response Pointer where to store the hw_info structure. | |
188 | * | |
189 | * @return SR_OK upon success, SR_ERR on failure. | |
190 | * The hw_info structure must be freed by the caller with sr_scpi_hw_info_free(). | |
191 | */ | |
192 | SR_PRIV int sr_scpi_get_hw_id(struct sr_serial_dev_inst *serial, | |
193 | struct sr_scpi_hw_info **scpi_response) | |
194 | { | |
195 | int num_tokens; | |
196 | char *response; | |
197 | gchar **tokens; | |
198 | ||
199 | struct sr_scpi_hw_info *hw_info; | |
200 | ||
201 | response = NULL; | |
202 | tokens = NULL; | |
203 | ||
204 | if (sr_scpi_get_string(serial, SCPI_CMD_IDN, &response) != SR_OK) | |
205 | if (!response) | |
206 | return SR_ERR; | |
207 | ||
208 | /* | |
209 | * The response to a '*IDN?' is specified by the SCPI spec. It contains | |
210 | * a comma-separated list containing the manufacturer name, instrument | |
211 | * model, serial number of the instrument and the firmware version. | |
212 | */ | |
213 | tokens = g_strsplit(response, ",", 0); | |
214 | ||
215 | for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++); | |
216 | ||
217 | if (num_tokens != 4) { | |
218 | sr_dbg("IDN response not according to spec: %80.s", response); | |
219 | g_strfreev(tokens); | |
220 | g_free(response); | |
221 | return SR_ERR; | |
222 | } | |
223 | g_free(response); | |
224 | ||
225 | hw_info = g_try_malloc(sizeof(struct sr_scpi_hw_info)); | |
226 | if (!hw_info) { | |
227 | g_strfreev(tokens); | |
228 | return SR_ERR_MALLOC; | |
229 | } | |
230 | ||
231 | hw_info->manufacturer = g_strdup(tokens[0]); | |
232 | hw_info->model = g_strdup(tokens[1]); | |
233 | hw_info->serial_number = g_strdup(tokens[2]); | |
234 | hw_info->firmware_version = g_strdup(tokens[3]); | |
235 | ||
236 | g_strfreev(tokens); | |
237 | ||
238 | *scpi_response = hw_info; | |
239 | ||
240 | return SR_OK; | |
241 | } | |
242 | ||
243 | /** | |
244 | * Free a sr_scpi_hw_info struct. | |
245 | * | |
246 | * @param hw_info Pointer to the struct to free. | |
247 | * | |
248 | * This function is safe to call with a NULL pointer. | |
249 | */ | |
250 | SR_PRIV void sr_scpi_hw_info_free(struct sr_scpi_hw_info *hw_info) | |
251 | { | |
252 | if (hw_info) { | |
253 | g_free(hw_info->manufacturer); | |
254 | g_free(hw_info->model); | |
255 | g_free(hw_info->serial_number); | |
256 | g_free(hw_info->firmware_version); | |
257 | g_free(hw_info); | |
258 | } | |
259 | } |