2 * This file is part of the libsigrok project.
4 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
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.
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, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <libsigrok/libsigrok.h>
25 #include "libsigrok-internal.h"
36 static void parse_packet(const uint8_t *buf, float *floatval,
37 struct sr_datafeed_analog *analog)
39 gboolean is_a, is_fast;
41 uint8_t level = 0, level_bits;
43 /* Byte 0 [7:7]: 0 = A, 1 = C */
44 is_a = ((buf[0] & (1 << 7)) == 0);
46 /* Byte 0 [6:6]: Unknown/unused? */
48 /* Byte 0 [5:4]: Level (00 = 40, 01 = 60, 10 = 80, 11 = 100) */
49 level_bits = (buf[0] >> 4) & 0x03;
52 else if (level_bits == 1)
54 else if (level_bits == 2)
56 else if (level_bits == 3)
59 /* Byte 0 [3:3]: 0 = fast, 1 = slow */
60 is_fast = ((buf[0] & (1 << 3)) == 0);
62 /* Byte 0 [2:0]: value[10..8] */
63 /* Byte 1 [7:0]: value[7..0] */
64 intval = (buf[0] & 0x7) << 8;
67 *floatval = (float)intval;
69 /* The value on the display always has one digit after the comma. */
72 analog->meaning->mq = SR_MQ_SOUND_PRESSURE_LEVEL;
73 analog->meaning->unit = SR_UNIT_DECIBEL_SPL;
76 analog->meaning->mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
78 analog->meaning->mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
81 analog->meaning->mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
83 analog->meaning->mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
85 /* TODO: How to handle level? */
89 static void decode_packet(struct sr_dev_inst *sdi)
91 struct sr_datafeed_packet packet;
92 struct sr_datafeed_analog analog;
93 struct sr_analog_encoding encoding;
94 struct sr_analog_meaning meaning;
95 struct sr_analog_spec spec;
96 struct dev_context *devc;
101 sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
103 parse_packet(devc->buf, &floatval, &analog);
105 /* Send a sample packet with one analog value. */
106 analog.meaning->channels = sdi->channels;
107 analog.num_samples = 1;
108 analog.data = &floatval;
109 packet.type = SR_DF_ANALOG;
110 packet.payload = &analog;
111 sr_session_send(sdi, &packet);
113 sr_sw_limits_update_samples_read(&devc->limits, 1);
116 SR_PRIV int tondaj_sl_814_receive_data(int fd, int revents, void *cb_data)
118 struct sr_dev_inst *sdi;
119 struct dev_context *devc;
120 struct sr_serial_dev_inst *serial;
131 /* TODO: Parts of this code need to be improved later. */
134 if (devc->state == SEND_INIT) {
135 /* On the first run, send the "init" command. */
139 sr_spew("Sending init command: %02x %02x %02x.",
140 buf[0], buf[1], buf[2]);
141 if ((ret = serial_write_blocking(serial, buf, 3,
142 serial_timeout(serial, 3))) < 0) {
143 sr_err("Error sending init command: %d.", ret);
146 devc->state = GET_INIT_REPLY;
147 } else if (devc->state == GET_INIT_REPLY) {
148 /* If we just sent the "init" command, get its reply. */
149 if ((ret = serial_read_blocking(serial, buf, 2, 0)) < 0) {
150 sr_err("Error reading init reply: %d.", ret);
153 sr_spew("Received init reply: %02x %02x.", buf[0], buf[1]);
154 /* Expected reply: 0x05 0x0d */
155 if (buf[0] != 0x05 || buf[1] != 0x0d) {
156 sr_err("Received incorrect init reply, retrying.");
157 devc->state = SEND_INIT;
160 devc->state = SEND_PACKET_REQUEST;
161 } else if (devc->state == SEND_PACKET_REQUEST) {
162 /* Request a packet (send 0x30 ZZ 0x0d). */
164 buf[1] = 0x00; /* ZZ */
166 sr_spew("Sending data request command: %02x %02x %02x.",
167 buf[0], buf[1], buf[2]);
168 if ((ret = serial_write_blocking(serial, buf, 3,
169 serial_timeout(serial, 3))) < 0) {
170 sr_err("Error sending request command: %d.", ret);
174 devc->state = GET_PACKET;
175 } else if (devc->state == GET_PACKET) {
176 /* Read a packet from the device. */
177 ret = serial_read_nonblocking(serial, devc->buf + devc->buflen,
180 sr_err("Error reading packet: %d.", ret);
186 /* Didn't receive all 4 bytes, yet. */
187 if (devc->buflen != 4)
190 sr_spew("Received packet: %02x %02x %02x %02x.", devc->buf[0],
191 devc->buf[1], devc->buf[2], devc->buf[3]);
193 /* Expected reply: AA BB ZZ+1 0x0d */
194 if (devc->buf[2] != 0x01 || devc->buf[3] != 0x0d) {
195 sr_err("Received incorrect request reply, retrying.");
196 devc->state = SEND_PACKET_REQUEST;
202 devc->state = SEND_PACKET_REQUEST;
204 sr_err("Invalid state: %d.", devc->state);
208 if (sr_sw_limits_check(&devc->limits))
209 sdi->driver->dev_acquisition_stop(sdi);