]>
Commit | Line | Data |
---|---|---|
8f4e922f UH |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "protocol.h" | |
22 | ||
b5e92647 UH |
23 | #define REQ_TIMEOUT_MS 500 |
24 | ||
25 | static int send_cmd(struct sr_serial_dev_inst *serial, const char *cmd) | |
26 | { | |
27 | int ret; | |
28 | char *cmd_esc; | |
29 | ||
30 | cmd_esc = g_strescape(cmd, NULL); | |
31 | sr_dbg("Sending '%s'.", cmd_esc); | |
32 | ||
33 | if ((ret = serial_write_blocking(serial, cmd, strlen(cmd))) < 0) { | |
34 | sr_err("Error sending command: %d.", ret); | |
35 | g_free(cmd_esc); | |
36 | return ret; | |
37 | } | |
38 | ||
39 | g_free(cmd_esc); | |
40 | ||
41 | return ret; | |
42 | } | |
43 | ||
44 | static int parse_volt_curr_mode(struct sr_dev_inst *sdi, char **tokens) | |
45 | { | |
46 | char *str; | |
47 | double val; | |
48 | struct dev_context *devc; | |
49 | ||
50 | devc = sdi->priv; | |
51 | ||
52 | /* Bytes 0-3: Voltage. */ | |
53 | str = g_strndup(tokens[0], 4); | |
54 | val = g_ascii_strtod(str, NULL) / 100; | |
55 | devc->voltage = val; | |
56 | g_free(str); | |
57 | ||
58 | /* Bytes 4-7: Current. */ | |
59 | str = g_strndup((tokens[0] + 4), 4); | |
60 | val = g_ascii_strtod(str, NULL) / 100; | |
61 | devc->current = val; | |
62 | g_free(str); | |
63 | ||
64 | /* Byte 8: Mode ('0' means CV, '1' means CC). */ | |
65 | devc->cc_mode = (tokens[0][8] == '1'); | |
66 | ||
67 | return SR_OK; | |
68 | } | |
69 | ||
70 | static void send_sample(struct sr_dev_inst *sdi) | |
8f4e922f | 71 | { |
8f4e922f | 72 | struct dev_context *devc; |
b5e92647 UH |
73 | struct sr_datafeed_packet packet; |
74 | struct sr_datafeed_analog analog; | |
75 | ||
76 | devc = sdi->priv; | |
77 | ||
78 | packet.type = SR_DF_ANALOG; | |
79 | packet.payload = &analog; | |
80 | analog.channels = sdi->channels; | |
81 | analog.num_samples = 1; | |
82 | ||
83 | analog.mq = SR_MQ_VOLTAGE; | |
84 | analog.unit = SR_UNIT_VOLT; | |
85 | analog.mqflags = SR_MQFLAG_DC; | |
86 | analog.data = &devc->voltage; | |
87 | sr_session_send(sdi, &packet); | |
88 | ||
89 | analog.mq = SR_MQ_CURRENT; | |
90 | analog.unit = SR_UNIT_AMPERE; | |
91 | analog.mqflags = 0; | |
92 | analog.data = &devc->current; | |
93 | sr_session_send(sdi, &packet); | |
94 | ||
95 | devc->num_samples++; | |
96 | } | |
97 | ||
98 | static int parse_reply(struct sr_dev_inst *sdi) | |
99 | { | |
100 | struct dev_context *devc; | |
101 | char *reply_esc, **tokens; | |
102 | ||
103 | devc = sdi->priv; | |
104 | ||
105 | reply_esc = g_strescape(devc->buf, NULL); | |
106 | sr_dbg("Received '%s'.", reply_esc); | |
107 | ||
108 | tokens = g_strsplit(devc->buf, "\r", 0); | |
109 | ||
110 | if (parse_volt_curr_mode(sdi, tokens) < 0) | |
111 | return SR_ERR; | |
112 | send_sample(sdi); | |
113 | ||
114 | g_free(reply_esc); | |
115 | g_strfreev(tokens); | |
116 | ||
117 | return SR_OK; | |
118 | } | |
119 | ||
120 | static int handle_new_data(struct sr_dev_inst *sdi) | |
121 | { | |
122 | int len; | |
123 | struct dev_context *devc; | |
124 | struct sr_serial_dev_inst *serial; | |
125 | ||
126 | devc = sdi->priv; | |
127 | serial = sdi->conn; | |
128 | ||
129 | len = serial_read(serial, devc->buf + devc->buflen, 1); | |
130 | if (len < 1) | |
131 | return SR_ERR; | |
132 | ||
133 | devc->buflen += len; | |
134 | devc->buf[devc->buflen] = '\0'; | |
135 | ||
136 | /* Wait until we received an "OK\r" (among other bytes). */ | |
137 | if (!g_str_has_suffix(devc->buf, "OK\r")) | |
138 | return SR_OK; | |
139 | ||
140 | parse_reply(sdi); | |
141 | ||
142 | devc->buf[0] = '\0'; | |
143 | devc->buflen = 0; | |
144 | ||
145 | devc->reply_pending = FALSE; | |
146 | ||
147 | return SR_OK; | |
148 | } | |
149 | ||
150 | SR_PRIV int hcs_receive_data(int fd, int revents, void *cb_data) | |
151 | { | |
152 | struct sr_dev_inst *sdi; | |
153 | struct dev_context *devc; | |
154 | struct sr_serial_dev_inst *serial; | |
155 | int64_t t, elapsed_us; | |
8f4e922f UH |
156 | |
157 | (void)fd; | |
158 | ||
159 | if (!(sdi = cb_data)) | |
160 | return TRUE; | |
161 | ||
162 | if (!(devc = sdi->priv)) | |
163 | return TRUE; | |
164 | ||
b5e92647 UH |
165 | serial = sdi->conn; |
166 | ||
8f4e922f | 167 | if (revents == G_IO_IN) { |
b5e92647 UH |
168 | /* New data arrived. */ |
169 | handle_new_data(sdi); | |
170 | } else { | |
171 | /* Timeout. */ | |
172 | } | |
173 | ||
174 | if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) { | |
175 | sr_info("Requested number of samples reached."); | |
176 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
177 | return TRUE; | |
178 | } | |
179 | ||
180 | if (devc->limit_msec) { | |
181 | t = (g_get_monotonic_time() - devc->starttime) / 1000; | |
182 | if (t > (int64_t)devc->limit_msec) { | |
183 | sr_info("Requested time limit reached."); | |
184 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
185 | return TRUE; | |
186 | } | |
187 | } | |
188 | ||
189 | /* Request next packet, if required. */ | |
190 | if (sdi->status == SR_ST_ACTIVE) { | |
191 | if (devc->reply_pending) { | |
192 | elapsed_us = g_get_monotonic_time() - devc->req_sent_at; | |
193 | if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) | |
194 | devc->reply_pending = FALSE; | |
195 | return TRUE; | |
196 | } | |
197 | ||
198 | /* Send command to get voltage, current, and mode (CC or CV). */ | |
199 | if (send_cmd(serial, "GETD\r") < 0) | |
200 | return TRUE; | |
201 | ||
202 | devc->req_sent_at = g_get_monotonic_time(); | |
203 | devc->reply_pending = TRUE; | |
8f4e922f UH |
204 | } |
205 | ||
206 | return TRUE; | |
207 | } |