275 lines
7.3 KiB
C
275 lines
7.3 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "protocol.h"
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/* Length of expected payload for each token. */
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static int token_payloads[][2] = {
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{ TOKEN_WEIGHT_TIME_FAST, 0 },
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{ TOKEN_WEIGHT_TIME_SLOW, 0 },
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{ TOKEN_HOLD_MAX, 0 },
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{ TOKEN_HOLD_MIN, 0 },
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{ TOKEN_TIME, 3 },
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{ TOKEN_MEAS_RANGE_OVER, 0 },
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{ TOKEN_MEAS_RANGE_UNDER, 0 },
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{ TOKEN_STORE_FULL, 0 },
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{ TOKEN_RECORDING_ON, 0 },
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{ TOKEN_MEAS_WAS_READOUT, 1 },
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{ TOKEN_MEAS_WAS_BARGRAPH, 0 },
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{ TOKEN_MEASUREMENT, 2 },
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{ TOKEN_HOLD_NONE, 0 },
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{ TOKEN_BATTERY_LOW, 0 },
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{ TOKEN_MEAS_RANGE_OK, 0 },
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{ TOKEN_STORE_OK, 0 },
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{ TOKEN_RECORDING_OFF, 0 },
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{ TOKEN_WEIGHT_FREQ_A, 1 },
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{ TOKEN_WEIGHT_FREQ_C, 1 },
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{ TOKEN_BATTERY_OK, 0 },
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{ TOKEN_MEAS_RANGE_30_80, 0 },
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{ TOKEN_MEAS_RANGE_30_130, 0 },
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{ TOKEN_MEAS_RANGE_50_100, 0 },
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{ TOKEN_MEAS_RANGE_80_130, 0 },
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};
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static int find_token_payload_len(unsigned char c)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(token_payloads); i++) {
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if (token_payloads[i][0] == c)
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return token_payloads[i][1];
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}
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return -1;
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}
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/* Process measurement or setting (0xa5 command). */
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static void process_mset(const struct sr_dev_inst *sdi)
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{
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struct dev_context *devc;
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog analog;
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GString *dbg;
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float fvalue;
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int i;
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devc = sdi->priv;
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if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
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dbg = g_string_sized_new(128);
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g_string_printf(dbg, "got command 0x%.2x token 0x%.2x",
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devc->cmd, devc->token);
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if (devc->buf_len) {
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g_string_append_printf(dbg, " payload");
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for (i = 0; i < devc->buf_len; i++)
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g_string_append_printf(dbg, " %.2x", devc->buf[i]);
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}
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sr_spew("%s", dbg->str);
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g_string_free(dbg, TRUE);
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}
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switch(devc->token) {
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case TOKEN_WEIGHT_TIME_FAST:
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devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
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devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
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break;
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case TOKEN_WEIGHT_TIME_SLOW:
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devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
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devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
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break;
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case TOKEN_WEIGHT_FREQ_A:
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devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
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devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
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break;
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case TOKEN_WEIGHT_FREQ_C:
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devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
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devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
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break;
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case TOKEN_HOLD_MAX:
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devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MAX;
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devc->cur_mqflags &= ~SR_MQFLAG_MIN;
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break;
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case TOKEN_HOLD_MIN:
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devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MIN;
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devc->cur_mqflags &= ~SR_MQFLAG_MAX;
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break;
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case TOKEN_HOLD_NONE:
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devc->cur_mqflags &= ~(SR_MQFLAG_MAX | SR_MQFLAG_MIN | SR_MQFLAG_HOLD);
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break;
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case TOKEN_MEASUREMENT:
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fvalue = ((devc->buf[0] & 0xf0) >> 4) * 100;
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fvalue += (devc->buf[0] & 0x0f) * 10;
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fvalue += ((devc->buf[1] & 0xf0) >> 4);
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fvalue += (devc->buf[1] & 0x0f) / 10.0;
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devc->last_spl = fvalue;
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break;
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case TOKEN_MEAS_WAS_READOUT:
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case TOKEN_MEAS_WAS_BARGRAPH:
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if (devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN)) {
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if (devc->token == TOKEN_MEAS_WAS_BARGRAPH) {
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/* The device still sends bargraph measurements even
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* when in max/min hold mode. Suppress them here, unless
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* they're readout values. This duplicates the behavior
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* of the device display exactly. */
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break;
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}
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}
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memset(&analog, 0, sizeof(struct sr_datafeed_analog));
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analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
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analog.mqflags = devc->cur_mqflags;
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analog.unit = SR_UNIT_DECIBEL_SPL;
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analog.probes = sdi->probes;
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analog.num_samples = 1;
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analog.data = &devc->last_spl;
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog;
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sr_session_send(devc->cb_data, &packet);
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devc->num_samples++;
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if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
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sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
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devc->cb_data);
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break;
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case TOKEN_TIME:
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case TOKEN_STORE_OK:
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case TOKEN_STORE_FULL:
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case TOKEN_RECORDING_ON:
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case TOKEN_RECORDING_OFF:
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case TOKEN_BATTERY_OK:
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case TOKEN_BATTERY_LOW:
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case TOKEN_MEAS_RANGE_OK:
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case TOKEN_MEAS_RANGE_OVER:
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case TOKEN_MEAS_RANGE_UNDER:
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case TOKEN_MEAS_RANGE_30_80:
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case TOKEN_MEAS_RANGE_30_130:
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case TOKEN_MEAS_RANGE_50_100:
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case TOKEN_MEAS_RANGE_80_130:
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/* Not useful, or not expressable in sigrok. */
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break;
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}
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}
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static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c)
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{
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struct dev_context *devc;
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gint64 cur_time;
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int len;
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if (!(devc = sdi->priv))
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return;
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if (c == 0xff) {
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/* Device is in hold mode */
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devc->cur_mqflags |= SR_MQFLAG_HOLD;
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if (devc->hold_last_sent == 0) {
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/* First hold notification. */
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devc->hold_last_sent = g_get_monotonic_time();
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/* When the device leaves hold mode, it starts from scratch. */
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devc->state = ST_INIT;
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} else {
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cur_time = g_get_monotonic_time();
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if (cur_time - devc->hold_last_sent > HOLD_REPEAT_INTERVAL) {
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/* Force the last measurement out again. */
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devc->cmd = 0xa5;
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devc->token = TOKEN_MEAS_WAS_READOUT;
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process_mset(sdi);
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devc->hold_last_sent = cur_time;
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}
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}
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return;
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}
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devc->cur_mqflags &= ~SR_MQFLAG_HOLD;
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devc->hold_last_sent = 0;
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if (devc->state == ST_INIT) {
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if (c == 0xa5) {
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devc->cmd = c;
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devc->token = 0x00;
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devc->state = ST_GET_TOKEN;
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} else if (c == 0xbb) {
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devc->cmd = c;
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devc->buf_len = 0;
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devc->state = ST_GET_LOG;
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}
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} else if (devc->state == ST_GET_TOKEN) {
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devc->token = c;
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devc->buf_len = 0;
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len = find_token_payload_len(devc->token);
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if (len == -1 || len > 0) {
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devc->buf_len = 0;
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devc->state = ST_GET_DATA;
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} else {
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process_mset(sdi);
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devc->state = ST_INIT;
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}
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} else if (devc->state == ST_GET_DATA) {
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len = find_token_payload_len(devc->token);
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if (len == -1) {
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/* We don't know this token. */
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sr_dbg("Unknown 0xa5 token 0x%.2x", devc->token);
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if (c == 0xa5 || c == 0xbb) {
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/* Looks like a new command however. */
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process_mset(sdi);
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devc->state = ST_INIT;
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} else {
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devc->buf[devc->buf_len++] = c;
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if (devc->buf_len > BUF_SIZE) {
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/* Shouldn't happen, ignore. */
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devc->state = ST_INIT;
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}
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}
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} else {
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devc->buf[devc->buf_len++] = c;
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if (devc->buf_len == len) {
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process_mset(sdi);
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devc->state = ST_INIT;
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} else if (devc->buf_len > BUF_SIZE) {
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/* Shouldn't happen, ignore. */
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devc->state = ST_INIT;
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}
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}
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} else if (devc->state == ST_GET_LOG) {
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}
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}
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SR_PRIV int cem_dt_885x_receive_data(int fd, int revents, void *cb_data)
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{
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const struct sr_dev_inst *sdi;
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struct sr_serial_dev_inst *serial;
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unsigned char c;
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(void)fd;
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if (!(sdi = cb_data))
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return TRUE;
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serial = sdi->conn;
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if (revents == G_IO_IN) {
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if (serial_read(serial, &c, 1) != 1)
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return TRUE;
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process_byte(sdi, c);
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}
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return TRUE;
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}
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