libsigrok/hardware/colead-slm/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
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#include <errno.h>
#include <string.h>
static void process_packet(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
GString *dbg;
float fvalue;
int checksum, mode, i;
devc = sdi->priv;
if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
dbg = g_string_sized_new(128);
g_string_printf(dbg, "received packet:");
for (i = 0; i < 10; i++)
g_string_append_printf(dbg, " %.2x", (devc->buf)[i]);
sr_spew("%s", dbg->str);
g_string_free(dbg, TRUE);
}
if (devc->buf[0] != 0x08 || devc->buf[1] != 0x04) {
sr_dbg("invalid packet header.");
return;
}
if (devc->buf[8] != 0x01) {
sr_dbg("invalid measurement.");
return;
}
checksum = 0;
for (i = 0; i < 9; i++)
checksum += devc->buf[i];
if ((checksum & 0xff) != devc->buf[9]) {
sr_dbg("invalid packet checksum.");
return;
}
fvalue = 0.0;
for (i = 3; i < 8; i++) {
if (devc->buf[i] > 0x09)
continue;
fvalue *= 10;
fvalue += devc->buf[i];
}
fvalue /= 10;
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
analog.unit = SR_UNIT_DECIBEL_SPL;
analog.probes = sdi->probes;
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analog.num_samples = 1;
analog.data = &fvalue;
/* High nibble should only have 0x01 or 0x02. */
mode = (devc->buf[2] >> 4) & 0x0f;
if (mode == 0x02)
analog.mqflags |= SR_MQFLAG_HOLD;
else if (mode != 0x01) {
sr_dbg("unknown measurement mode 0x%.2x", mode);
return;
}
/* Low nibble has 14 combinations of direct/long-term average,
* time scale of that average, frequency weighting, and time
* weighting. */
mode = devc->buf[2] & 0x0f;
switch (mode) {
case 0x0:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0x1:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0x2:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0x3:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0x4:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0x5:
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0x6:
analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0x7:
analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0x8:
/* 10-second mean, but we don't have MQ flags to express it. */
analog.mqflags |= SR_MQFLAG_SPL_LAT \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0x9:
/* Mean over a time period between 11 seconds and 24 hours.
* Which is so silly that there's no point in expressing
* either this or the previous case. */
analog.mqflags |= SR_MQFLAG_SPL_LAT \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case 0xa:
/* 10-second mean. */
analog.mqflags |= SR_MQFLAG_SPL_LAT \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0xb:
/* Mean over a time period between 11 seconds and 24 hours. */
analog.mqflags |= SR_MQFLAG_SPL_LAT \
| SR_MQFLAG_SPL_FREQ_WEIGHT_A \
| SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case 0xc:
/* Internal calibration on 1kHz sine at 94dB, not useful
* to anything but the device. */
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT;
break;
case 0xd:
/* Internal calibration on 1kHz sine at 94dB, not useful
* to anything but the device. */
analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT;
break;
default:
sr_dbg("unknown configuration 0x%.2x", mode);
return;
break;
}
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
}
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SR_PRIV int colead_slm_receive_data(int fd, int revents, void *cb_data)
{
const struct sr_dev_inst *sdi;
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
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int len;
char buf[128];
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(void)fd;
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if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
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if (revents != G_IO_IN)
/* Timeout event. */
return TRUE;
serial = sdi->conn;
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if (devc->state == IDLE) {
if (serial_read(serial, buf, 128) != 1 || buf[0] != 0x10)
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/* Nothing there, or caught the tail end of a previous packet,
* or some garbage. Unless it's a single "data ready" byte,
* we don't want it. */
return TRUE;
/* Got 0x10, "measurement ready". */
if (serial_write(serial, "\x20", 1) == -1)
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sr_err("unable to send command: %s", strerror(errno));
else {
devc->state = COMMAND_SENT;
devc->buflen = 0;
}
} else {
len = serial_read(serial, devc->buf + devc->buflen,
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10 - devc->buflen);
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if (len < 1)
return TRUE;
devc->buflen += len;
if (devc->buflen > 10) {
sr_dbg("buffer overrun");
devc->state = IDLE;
return TRUE;
}
if (devc->buflen == 10) {
/* If we got here, we're sure the device sent a "data ready"
* notification, we asked for data, and got it. */
process_packet(sdi);
devc->state = IDLE;
}
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}
return TRUE;
}