2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
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.
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.
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/>.
20 #include "libsigrok.h"
21 #include "libsigrok-internal.h"
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)
34 #define SCPI_READ_RETRIES 100
35 #define SCPI_READ_RETRY_TIMEOUT 10000
38 * Send a SCPI command.
40 * @param serial Previously initialized serial port structure.
41 * @param command The SCPI command to send to the device.
43 * @return SR_OK on success, SR_ERR on failure.
45 SR_PRIV int sr_scpi_send(struct sr_serial_dev_inst *serial,
50 gchar *terminated_command;
52 terminated_command = g_strconcat(command, "\n", NULL);
53 len = strlen(terminated_command);
55 out = serial_write(serial, terminated_command,
56 strlen(terminated_command));
58 g_free(terminated_command);
61 sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out,
66 sr_spew("Successfully sent SCPI command: '%s'.", command);
72 * Send a SCPI command, receive the reply and store the reply in scpi_response.
74 * @param serial Previously initialized serial port structure.
75 * @param command The SCPI command to send to the device (can be NULL).
76 * @param scpi_response Pointer where to store the scpi response.
78 * @return SR_OK upon fetching a full SCPI response, SR_ERR upon fetching a
79 * incomplete or no response. The allocated response must be freed by the caller
80 * in the case of a full response as well in the case of an incomplete.
82 SR_PRIV int sr_scpi_get_string(struct sr_serial_dev_inst *serial,
83 const char *command, char **scpi_response)
92 if (sr_scpi_send(serial, command) != SR_OK)
95 response = g_string_sized_new(1024);
97 for (i = 0; i <= SCPI_READ_RETRIES; i++) {
98 while ((len = serial_read(serial, buf, sizeof(buf))) > 0)
99 response = g_string_append_len(response, buf, len);
101 if (response->len > 0 &&
102 response->str[response->len-1] == '\n') {
103 sr_spew("Fetched full SCPI response");
107 g_usleep(SCPI_READ_RETRY_TIMEOUT);
110 if (response->len == 0) {
111 sr_dbg("No SCPI response received");
112 g_string_free(response, TRUE);
113 *scpi_response = NULL;
116 } else if (response->str[response->len-1] == '\n') {
118 * The SCPI response contains a LF ('\n') at the end and we
119 * don't need this so replace it with a '\0' and decrement
122 response->str[--response->len] = '\0';
126 sr_warn("Incomplete SCPI response received!");
130 /* Minor optimization: steal the string instead of copying. */
131 *scpi_response = response->str;
133 /* A SCPI response can be quite large, print at most 50 characters */
134 sr_dbg("SCPI response for command %s received (length %d): '%.50s'",
135 command, response->len, response->str);
137 g_string_free(response, FALSE);
143 * Send the *IDN? SCPI command, receive the reply, parse it and store the
144 * reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer.
146 * @param serial Previously initialized serial port structure.
147 * @param scpi_response Pointer where to store the hw_info structure.
149 * @return SR_OK upon success, SR_ERR on failure.
150 * The hw_info structure must be freed by the caller with sr_scpi_hw_info_free().
152 SR_PRIV int sr_scpi_get_hw_id(struct sr_serial_dev_inst *serial,
153 struct sr_scpi_hw_info **scpi_response)
159 struct sr_scpi_hw_info *hw_info;
164 if (sr_scpi_get_string(serial, SCPI_CMD_IDN, &response) != SR_OK)
169 * The response to a '*IDN?' is specified by the SCPI spec. It contains
170 * a comma-separated list containing the manufacturer name, instrument
171 * model, serial number of the instrument and the firmware version.
173 tokens = g_strsplit(response, ",", 0);
175 for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
177 if (num_tokens != 4) {
178 sr_dbg("IDN response not according to spec: %80.s", response);
185 hw_info = g_try_malloc(sizeof(struct sr_scpi_hw_info));
188 return SR_ERR_MALLOC;
191 hw_info->manufacturer = g_strdup(tokens[0]);
192 hw_info->model = g_strdup(tokens[1]);
193 hw_info->serial_number = g_strdup(tokens[2]);
194 hw_info->firmware_version = g_strdup(tokens[3]);
198 *scpi_response = hw_info;
204 * Free a sr_scpi_hw_info struct.
206 * @param hw_info Pointer to the struct to free.
208 * This function is safe to call with a NULL pointer.
210 SR_PRIV void sr_scpi_hw_info_free(struct sr_scpi_hw_info *hw_info)
213 g_free(hw_info->manufacturer);
214 g_free(hw_info->model);
215 g_free(hw_info->serial_number);
216 g_free(hw_info->firmware_version);