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pce-322a: Initial driver implementation.
[libsigrok.git] / src / hardware / pce-322a / protocol.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2016 George Hopkins <george-hopkins@null.net>
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 <config.h>
21 #include "protocol.h"
22
23 static int send_command(const struct sr_dev_inst *sdi, uint16_t command)
24 {
25         struct sr_serial_dev_inst *serial;
26         uint8_t buffer[2];
27
28         buffer[0] = command >> 8;
29         buffer[1] = command;
30
31         if (!(serial = sdi->conn))
32                 return SR_ERR;
33
34         if (serial_write_nonblocking(serial, (const void *)buffer, 2) != 2)
35                 return SR_ERR;
36
37         return SR_OK;
38 }
39
40 static void send_data(const struct sr_dev_inst *sdi, float sample)
41 {
42         struct dev_context *devc;
43         struct sr_datafeed_packet packet;
44         struct sr_datafeed_analog analog;
45         struct sr_analog_encoding encoding;
46         struct sr_analog_meaning meaning;
47         struct sr_analog_spec spec;
48
49         devc = sdi->priv;
50
51         sr_analog_init(&analog, &encoding, &meaning, &spec, 1);
52         meaning.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
53         meaning.mqflags = devc->cur_mqflags;
54         meaning.unit = SR_UNIT_DECIBEL_SPL;
55         meaning.channels = sdi->channels;
56         analog.num_samples = 1;
57         analog.data = &sample;
58         packet.type = SR_DF_ANALOG;
59         packet.payload = &analog;
60         sr_session_send(sdi, &packet);
61
62         devc->num_samples++;
63         if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
64                 sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi);
65 }
66
67 static void process_measurement(const struct sr_dev_inst *sdi)
68 {
69         struct dev_context *devc;
70         unsigned short value;
71
72         devc = sdi->priv;
73
74         if (devc->buffer[3] & (1 << 0)) {
75                 devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
76                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
77         } else {
78                 devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
79                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
80         }
81
82         if (devc->buffer[3] & (1 << 1)) {
83                 devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
84                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
85         } else {
86                 devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
87                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
88         }
89
90         devc->cur_meas_range = devc->buffer[4] & 3;
91
92         if (devc->buffer[4] & (1 << 2)) {
93                 devc->cur_mqflags |= SR_MQFLAG_MAX;
94                 devc->cur_mqflags &= ~SR_MQFLAG_MIN;
95         } else if (devc->buffer[4] & (1 << 3)) {
96                 devc->cur_mqflags |= SR_MQFLAG_MIN;
97                 devc->cur_mqflags &= ~SR_MQFLAG_MAX;
98         } else {
99                 devc->cur_mqflags &= ~SR_MQFLAG_MIN;
100                 devc->cur_mqflags &= ~SR_MQFLAG_MAX;
101         }
102
103         value = devc->buffer[1] << 8 | devc->buffer[2];
104         send_data(sdi, value / 10.0);
105 }
106
107 static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c)
108 {
109         struct dev_context *devc;
110         unsigned int i;
111
112         devc = sdi->priv;
113
114         if (devc->buffer_len < BUFFER_SIZE) {
115                 devc->buffer[devc->buffer_len++] = c;
116         } else {
117                 for (i = 1; i < BUFFER_SIZE; i++)
118                         devc->buffer[i - 1] = devc->buffer[i];
119                 devc->buffer[BUFFER_SIZE - 1] = c;
120                 if (devc->buffer[0] == 0x7f && devc->buffer[BUFFER_SIZE - 1] == 0x00) {
121                         process_measurement(sdi);
122                         devc->buffer_len = 0;
123                 }
124         }
125 }
126
127 SR_PRIV int pce_322a_receive_data(int fd, int revents, void *cb_data)
128 {
129         const struct sr_dev_inst *sdi;
130         struct dev_context *devc;
131         struct sr_serial_dev_inst *serial;
132         unsigned char c;
133
134         (void)fd;
135
136         if (!(sdi = cb_data))
137                 return TRUE;
138
139         if (!(devc = sdi->priv))
140                 return TRUE;
141
142         if (!(serial = sdi->conn))
143                 return TRUE;
144
145         if (revents == G_IO_IN) {
146                 if (serial_read_nonblocking(serial, &c, 1) != 1)
147                         return TRUE;
148                 process_byte(sdi, c);
149         }
150
151         return TRUE;
152 }
153
154 SR_PRIV int pce_322a_connect(const struct sr_dev_inst *sdi)
155 {
156         return send_command(sdi, CMD_CONNECT);
157 }
158
159 SR_PRIV int pce_322a_disconnect(const struct sr_dev_inst *sdi)
160 {
161         return send_command(sdi, CMD_DISCONNECT);
162 }
163
164 SR_PRIV uint64_t pce_322a_weight_freq_get(const struct sr_dev_inst *sdi)
165 {
166         struct dev_context *devc;
167
168         devc = sdi->priv;
169
170         return devc->cur_mqflags & (SR_MQFLAG_SPL_FREQ_WEIGHT_A | SR_MQFLAG_SPL_FREQ_WEIGHT_C);
171 }
172
173 SR_PRIV int pce_322a_weight_freq_set(const struct sr_dev_inst *sdi, uint64_t freqw)
174 {
175         struct dev_context *devc;
176
177         devc = sdi->priv;
178
179         if (devc->cur_mqflags & freqw)
180                 return SR_OK;
181
182         return send_command(sdi, CMD_TOGGLE_WEIGHT_FREQ);
183 }
184
185 SR_PRIV uint64_t pce_322a_weight_time_get(const struct sr_dev_inst *sdi)
186 {
187         struct dev_context *devc;
188
189         devc = sdi->priv;
190
191         return devc->cur_mqflags & (SR_MQFLAG_SPL_TIME_WEIGHT_F | SR_MQFLAG_SPL_TIME_WEIGHT_S);
192 }
193
194 SR_PRIV int pce_322a_weight_time_set(const struct sr_dev_inst *sdi, uint64_t timew)
195 {
196         struct dev_context *devc;
197
198         devc = sdi->priv;
199
200         if (devc->cur_mqflags & timew)
201                 return SR_OK;
202
203         return send_command(sdi, CMD_TOGGLE_WEIGHT_TIME);
204 }
205
206 SR_PRIV int pce_322a_meas_range_get(const struct sr_dev_inst *sdi,
207                 uint64_t *low, uint64_t *high)
208 {
209         struct dev_context *devc;
210
211         devc = sdi->priv;
212
213         switch (devc->cur_meas_range) {
214         case MEAS_RANGE_30_130:
215                 *low = 30;
216                 *high = 130;
217                 break;
218         case MEAS_RANGE_30_80:
219                 *low = 30;
220                 *high = 80;
221                 break;
222         case MEAS_RANGE_50_100:
223                 *low = 50;
224                 *high = 100;
225                 break;
226         case MEAS_RANGE_80_130:
227                 *low = 80;
228                 *high = 130;
229                 break;
230         default:
231                 return SR_ERR;
232         }
233
234         return SR_OK;
235 }
236
237 SR_PRIV int pce_322a_meas_range_set(const struct sr_dev_inst *sdi,
238                 uint64_t low, uint64_t high)
239 {
240         struct dev_context *devc;
241         uint8_t range;
242         int ret = SR_OK;
243
244         devc = sdi->priv;
245
246         if (low == 30 && high == 130)
247                 range = MEAS_RANGE_30_130;
248         else if (low == 30 && high == 80)
249                 range = MEAS_RANGE_30_80;
250         else if (low == 50 && high == 100)
251                 range = MEAS_RANGE_50_100;
252         else if (low == 80 && high == 130)
253                 range = MEAS_RANGE_80_130;
254         else
255                 return SR_ERR;
256
257         while (range != devc->cur_meas_range) {
258                 ret = send_command(sdi, CMD_TOGGLE_MEAS_RANGE);
259                 if (ret != SR_OK)
260                         break;
261                 range = (range - 1) & 3;
262         }
263
264         return ret;
265 }
266
267 SR_PRIV int pce_322a_power_off(const struct sr_dev_inst *sdi)
268 {
269         return send_command(sdi, CMD_POWER_OFF);
270 }