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libsigrok/hardware/cem-dt-885x/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 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 <string.h>
#include "protocol.h"
/* Length of expected payload for each token. */
static int token_payloads[][2] = {
{ TOKEN_WEIGHT_TIME_FAST, 0 },
{ TOKEN_WEIGHT_TIME_SLOW, 0 },
{ TOKEN_HOLD_MAX, 0 },
{ TOKEN_HOLD_MIN, 0 },
{ TOKEN_TIME, 3 },
{ TOKEN_MEAS_RANGE_OVER, 0 },
{ TOKEN_MEAS_RANGE_UNDER, 0 },
{ TOKEN_STORE_FULL, 0 },
{ TOKEN_RECORDING_ON, 0 },
{ TOKEN_MEAS_WAS_READOUT, 1 },
{ TOKEN_MEAS_WAS_BARGRAPH, 0 },
{ TOKEN_MEASUREMENT, 2 },
{ TOKEN_HOLD_NONE, 0 },
{ TOKEN_BATTERY_LOW, 0 },
{ TOKEN_MEAS_RANGE_OK, 0 },
{ TOKEN_STORE_OK, 0 },
{ TOKEN_RECORDING_OFF, 0 },
{ TOKEN_WEIGHT_FREQ_A, 1 },
{ TOKEN_WEIGHT_FREQ_C, 1 },
{ TOKEN_BATTERY_OK, 0 },
{ TOKEN_MEAS_RANGE_30_80, 0 },
{ TOKEN_MEAS_RANGE_30_130, 0 },
{ TOKEN_MEAS_RANGE_50_100, 0 },
{ TOKEN_MEAS_RANGE_80_130, 0 },
};
static int find_token_payload_len(unsigned char c)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(token_payloads); i++) {
if (token_payloads[i][0] == c)
return token_payloads[i][1];
}
return -1;
}
/* Process measurement or setting (0xa5 command). */
static void process_mset(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 i;
devc = sdi->priv;
if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
dbg = g_string_sized_new(128);
g_string_printf(dbg, "got command 0x%.2x token 0x%.2x",
devc->cmd, devc->token);
if (devc->buf_len) {
g_string_append_printf(dbg, " payload");
for (i = 0; i < devc->buf_len; i++)
g_string_append_printf(dbg, " %.2x", devc->buf[i]);
}
sr_spew("%s", dbg->str);
g_string_free(dbg, TRUE);
}
switch(devc->token) {
case TOKEN_WEIGHT_TIME_FAST:
devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
break;
case TOKEN_WEIGHT_TIME_SLOW:
devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
break;
case TOKEN_WEIGHT_FREQ_A:
devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
break;
case TOKEN_WEIGHT_FREQ_C:
devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
break;
case TOKEN_HOLD_MAX:
devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MAX;
devc->cur_mqflags &= ~SR_MQFLAG_MIN;
break;
case TOKEN_HOLD_MIN:
devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MIN;
devc->cur_mqflags &= ~SR_MQFLAG_MAX;
break;
case TOKEN_HOLD_NONE:
devc->cur_mqflags &= ~(SR_MQFLAG_MAX | SR_MQFLAG_MIN | SR_MQFLAG_HOLD);
break;
case TOKEN_MEASUREMENT:
fvalue = ((devc->buf[0] & 0xf0) >> 4) * 100;
fvalue += (devc->buf[0] & 0x0f) * 10;
fvalue += ((devc->buf[1] & 0xf0) >> 4);
fvalue += (devc->buf[1] & 0x0f) / 10.0;
devc->last_spl = fvalue;
break;
case TOKEN_MEAS_WAS_READOUT:
case TOKEN_MEAS_WAS_BARGRAPH:
if (devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN)) {
if (devc->token == TOKEN_MEAS_WAS_BARGRAPH) {
/* The device still sends bargraph measurements even
* when in max/min hold mode. Suppress them here, unless
* they're readout values. This duplicates the behavior
* of the device display exactly. */
break;
}
}
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
analog.mqflags = devc->cur_mqflags;
analog.unit = SR_UNIT_DECIBEL_SPL;
analog.channels = sdi->channels;
analog.num_samples = 1;
analog.data = &devc->last_spl;
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
devc->cb_data);
break;
case TOKEN_RECORDING_ON:
devc->recording = TRUE;
break;
case TOKEN_RECORDING_OFF:
devc->recording = FALSE;
break;
case TOKEN_MEAS_RANGE_30_80:
case TOKEN_MEAS_RANGE_30_130:
case TOKEN_MEAS_RANGE_50_100:
case TOKEN_MEAS_RANGE_80_130:
devc->cur_meas_range = devc->token;
break;
case TOKEN_TIME:
case TOKEN_STORE_OK:
case TOKEN_STORE_FULL:
case TOKEN_BATTERY_OK:
case TOKEN_BATTERY_LOW:
case TOKEN_MEAS_RANGE_OK:
case TOKEN_MEAS_RANGE_OVER:
case TOKEN_MEAS_RANGE_UNDER:
/* Not useful, or not expressable in sigrok. */
break;
}
}
static void send_data(const struct sr_dev_inst *sdi, unsigned char *data,
uint64_t num_samples)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
float fbuf[SAMPLES_PER_PACKET];
unsigned int i;
devc = sdi->priv;
for (i = 0; i < num_samples; i ++) {
fbuf[i] = ((data[i * 2] & 0xf0) >> 4) * 100;
fbuf[i] += (data[i * 2] & 0x0f) * 10;
fbuf[i] += ((data[i * 2 + 1] & 0xf0) >> 4);
fbuf[i] += (data[i * 2 + 1] & 0x0f) / 10.0;
}
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
analog.mqflags = devc->cur_mqflags;
analog.unit = SR_UNIT_DECIBEL_SPL;
analog.channels = sdi->channels;
analog.num_samples = num_samples;
analog.data = fbuf;
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples += analog.num_samples;
if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
devc->cb_data);
return;
}
static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c,
int handle_packets)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_meta meta;
struct sr_config *src;
gint64 cur_time;
int len;
if (!(devc = sdi->priv))
return;
if (c == 0xff) {
/* Device is in hold mode */
devc->cur_mqflags |= SR_MQFLAG_HOLD;
if (devc->hold_last_sent == 0) {
/* First hold notification. */
devc->hold_last_sent = g_get_monotonic_time();
/* When the device leaves hold mode, it starts from scratch. */
devc->state = ST_INIT;
} else {
cur_time = g_get_monotonic_time();
if (cur_time - devc->hold_last_sent > HOLD_REPEAT_INTERVAL) {
/* Force the last measurement out again. */
devc->cmd = 0xa5;
devc->token = TOKEN_MEAS_WAS_READOUT;
if (handle_packets)
process_mset(sdi);
devc->hold_last_sent = cur_time;
}
}
return;
}
devc->cur_mqflags &= ~SR_MQFLAG_HOLD;
devc->hold_last_sent = 0;
if (devc->state == ST_INIT) {
if (c == 0xa5) {
devc->cmd = c;
devc->token = 0x00;
devc->state = ST_GET_TOKEN;
} else if (c == 0xbb) {
devc->cmd = c;
devc->buf_len = 0;
devc->state = ST_GET_LOG_HEADER;
sr_dbg("got command 0xbb");
}
} else if (devc->state == ST_GET_TOKEN) {
devc->token = c;
devc->buf_len = 0;
len = find_token_payload_len(devc->token);
if (len == -1 || len > 0) {
devc->buf_len = 0;
devc->state = ST_GET_DATA;
} else {
if (handle_packets)
process_mset(sdi);
devc->state = ST_INIT;
}
} else if (devc->state == ST_GET_DATA) {
len = find_token_payload_len(devc->token);
if (len == -1) {
/* We don't know this token. */
sr_dbg("Unknown 0xa5 token 0x%.2x", devc->token);
if (c == 0xa5 || c == 0xbb) {
/* Looks like a new command however. */
if (handle_packets)
process_mset(sdi);
devc->state = ST_INIT;
} else {
devc->buf[devc->buf_len++] = c;
if (devc->buf_len > BUF_SIZE) {
/* Shouldn't happen, ignore. */
devc->state = ST_INIT;
}
}
} else {
devc->buf[devc->buf_len++] = c;
if (devc->buf_len == len) {
if (handle_packets)
process_mset(sdi);
devc->state = ST_INIT;
} else if (devc->buf_len > BUF_SIZE) {
/* Shouldn't happen, ignore. */
devc->state = ST_INIT;
}
}
} else if (devc->state == ST_GET_LOG_HEADER) {
sr_dbg("log header: 0x%.2x", c);
if (devc->buf_len < 2)
devc->buf[devc->buf_len++] = c;
if (devc->buf_len == 2) {
sr_dbg("Device says it has %d bytes stored.",
((devc->buf[0] << 8) + devc->buf[1]) - 100);
devc->buf_len = 0;
devc->state = ST_GET_LOG_RECORD_META;
}
} else if (devc->state == ST_GET_LOG_RECORD_META) {
sr_dbg("log meta: 0x%.2x", c);
if (c == RECORD_END) {
devc->state = ST_INIT;
/* Stop acquisition after transferring all stored
* records. Otherwise the frontend would have no
* way to tell where stored data ends and live
* measurements begin. */
sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
devc->cb_data);
} else if (c == RECORD_DATA) {
devc->buf_len = 0;
devc->state = ST_GET_LOG_RECORD_DATA;
} else {
/* RECORD_DBA/RECORD_DBC + 7 bytes of metadata */
devc->buf[devc->buf_len++] = c;
if (devc->buf_len < 8)
/* Keep filling up the record header. */
return;
if (devc->buf[0] == RECORD_DBA)
devc->cur_mqflags = SR_MQFLAG_SPL_FREQ_WEIGHT_A;
else if (devc->buf[0] == RECORD_DBC)
devc->cur_mqflags = SR_MQFLAG_SPL_FREQ_WEIGHT_C;
else {
/* Shouldn't happen. */
sr_dbg("Unknown record token 0x%.2x", c);
return;
}
packet.type = SR_DF_META;
packet.payload = &meta;
src = sr_config_new(SR_CONF_SAMPLE_INTERVAL,
g_variant_new_uint64(devc->buf[7] * 1000));
meta.config = g_slist_append(NULL, src);
sr_session_send(devc->cb_data, &packet);
g_free(src);
devc->buf_len = 0;
}
} else if (devc->state == ST_GET_LOG_RECORD_DATA) {
sr_dbg("log data: 0x%.2x", c);
if (c == RECORD_DBA || c == RECORD_DBC || c == RECORD_DATA || c == RECORD_END) {
/* Work around off-by-one bug in device firmware. This
* happens only on the last record, i.e. before RECORD_END */
if (devc->buf_len & 1)
devc->buf_len--;
/* Done with this set of samples */
send_data(sdi, devc->buf, devc->buf_len / 2);
devc->buf_len = 0;
/* Process this meta marker in the right state. */
devc->state = ST_GET_LOG_RECORD_META;
process_byte(sdi, c, handle_packets);
} else {
devc->buf[devc->buf_len++] = c;
if (devc->buf_len == SAMPLES_PER_PACKET * 2) {
send_data(sdi, devc->buf, devc->buf_len / 2);
devc->buf_len = 0;
}
}
}
}
SR_PRIV int cem_dt_885x_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;
unsigned char c, cmd;
(void)fd;
if (!(sdi = cb_data))
return TRUE;
devc = sdi->priv;
serial = sdi->conn;
if (revents == G_IO_IN) {
if (serial_read(serial, &c, 1) != 1)
return TRUE;
process_byte(sdi, c, TRUE);
if (devc->enable_data_source_memory) {
if (devc->state == ST_GET_LOG_HEADER) {
/* Memory transfer started. */
devc->enable_data_source_memory = FALSE;
} else {
/* Tell device to start transferring from memory. */
cmd = CMD_TRANSFER_MEMORY;
serial_write(serial, &cmd, 1);
}
}
}
return TRUE;
}
static int wait_for_token(const struct sr_dev_inst *sdi, int8_t *tokens, int timeout)
{
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
gint64 start_time;
int i;
unsigned char c;
serial = sdi->conn;
devc = sdi->priv;
devc->state = ST_INIT;
start_time = g_get_monotonic_time() / 1000;
while (TRUE) {
if (serial_read(serial, &c, 1) != 1)
/* Device might have gone away. */
return SR_ERR;
process_byte(sdi, c, FALSE);
if (devc->state != ST_INIT)
/* Wait for a whole packet to get processed. */
continue;
for (i = 0; tokens[i] != -1; i++) {
if (devc->token == tokens[i]) {
sr_spew("wait_for_token: got token 0x%.2x", devc->token);
return SR_OK;
}
}
if (timeout && g_get_monotonic_time() / 1000 - start_time > timeout)
return SR_ERR_TIMEOUT;
}
return SR_OK;
}
/* cmd is the command to send, tokens are the tokens that denote the state
* which the command affects. The first token is the desired state. */
static int cem_dt_885x_toggle(const struct sr_dev_inst *sdi, uint8_t cmd,
int8_t *tokens, int timeout)
{
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
serial = sdi->conn;
devc = sdi->priv;
/* The device doesn't respond to commands very well. The
* only thing to do is wait for the token that will confirm
* whether the command worked or not, and resend if needed. */
while (TRUE) {
if (serial_write(serial, (const void *)&cmd, 1) != 1)
return SR_ERR;
if (wait_for_token(sdi, tokens, timeout) == SR_ERR)
return SR_ERR;
if (devc->token == tokens[0])
/* It worked. */
break;
}
return SR_OK;
}
SR_PRIV gboolean cem_dt_885x_recording_get(const struct sr_dev_inst *sdi,
int *state)
{
struct dev_context *devc;
int8_t tokens[5];
devc = sdi->priv;
if (devc->recording == -1) {
/* Didn't pick up device state yet. */
tokens[0] = TOKEN_RECORDING_ON;
tokens[1] = TOKEN_RECORDING_OFF;
tokens[2] = -1;
if (wait_for_token(sdi, tokens, 510) != SR_OK)
return SR_ERR;
}
*state = devc->token == TOKEN_RECORDING_ON;
return SR_OK;
}
SR_PRIV int cem_dt_885x_recording_set(const struct sr_dev_inst *sdi,
gboolean state)
{
struct dev_context *devc;
int ret;
int8_t tokens[5];
devc = sdi->priv;
/* The toggle below needs the desired state in first position. */
if (state) {
tokens[0] = TOKEN_RECORDING_ON;
tokens[1] = TOKEN_RECORDING_OFF;
} else {
tokens[0] = TOKEN_RECORDING_OFF;
tokens[1] = TOKEN_RECORDING_ON;
}
tokens[2] = -1;
if (devc->recording == -1) {
/* Didn't pick up device state yet. */
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == tokens[0])
/* Nothing to do. */
return SR_OK;
} else if (devc->recording == state)
/* Nothing to do. */
return SR_OK;
/* Recording state notifications are sent at 2Hz, so allow just over
* that, 510ms, for the state to come in. */
ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_RECORDING, tokens, 510);
return ret;
}
SR_PRIV int cem_dt_885x_weight_freq_get(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int cur_setting;
int8_t tokens[5];
devc = sdi->priv;
cur_setting = devc->cur_mqflags & (SR_MQFLAG_SPL_FREQ_WEIGHT_A | SR_MQFLAG_SPL_FREQ_WEIGHT_C);
if (cur_setting == 0) {
/* Didn't pick up device state yet. */
tokens[0] = TOKEN_WEIGHT_FREQ_A;
tokens[1] = TOKEN_WEIGHT_FREQ_C;
tokens[2] = -1;
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == TOKEN_WEIGHT_FREQ_A)
return SR_MQFLAG_SPL_FREQ_WEIGHT_A;
else
return SR_MQFLAG_SPL_FREQ_WEIGHT_C;
} else
return cur_setting;
}
SR_PRIV int cem_dt_885x_weight_freq_set(const struct sr_dev_inst *sdi, int freqw)
{
struct dev_context *devc;
int cur_setting, ret;
int8_t tokens[5];
devc = sdi->priv;
cur_setting = devc->cur_mqflags & (SR_MQFLAG_SPL_FREQ_WEIGHT_A | SR_MQFLAG_SPL_FREQ_WEIGHT_C);
if (cur_setting == freqw)
/* Already set to this frequency weighting. */
return SR_OK;
/* The toggle below needs the desired state in first position. */
if (freqw == SR_MQFLAG_SPL_FREQ_WEIGHT_A) {
tokens[0] = TOKEN_WEIGHT_FREQ_A;
tokens[1] = TOKEN_WEIGHT_FREQ_C;
} else {
tokens[0] = TOKEN_WEIGHT_FREQ_C;
tokens[1] = TOKEN_WEIGHT_FREQ_A;
}
tokens[2] = -1;
if (cur_setting == 0) {
/* Didn't pick up device state yet. */
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == tokens[0])
/* Nothing to do. */
return SR_OK;
}
/* 10ms timeout seems to work best for this. */
ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_WEIGHT_FREQ, tokens, 10);
return ret;
}
SR_PRIV int cem_dt_885x_weight_time_get(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int cur_setting;
int8_t tokens[5];
devc = sdi->priv;
cur_setting = devc->cur_mqflags & (SR_MQFLAG_SPL_TIME_WEIGHT_F | SR_MQFLAG_SPL_TIME_WEIGHT_S);
if (cur_setting == 0) {
/* Didn't pick up device state yet. */
tokens[0] = TOKEN_WEIGHT_TIME_FAST;
tokens[1] = TOKEN_WEIGHT_TIME_SLOW;
tokens[2] = -1;
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == TOKEN_WEIGHT_TIME_FAST)
return SR_MQFLAG_SPL_TIME_WEIGHT_F;
else
return SR_MQFLAG_SPL_TIME_WEIGHT_S;
} else
return cur_setting;
}
SR_PRIV int cem_dt_885x_weight_time_set(const struct sr_dev_inst *sdi, int timew)
{
struct dev_context *devc;
int cur_setting, ret;
int8_t tokens[5];
devc = sdi->priv;
cur_setting = devc->cur_mqflags & (SR_MQFLAG_SPL_TIME_WEIGHT_F | SR_MQFLAG_SPL_TIME_WEIGHT_S);
if (cur_setting == timew)
/* Already set to this time weighting. */
return SR_OK;
/* The toggle below needs the desired state in first position. */
if (timew == SR_MQFLAG_SPL_TIME_WEIGHT_F) {
tokens[0] = TOKEN_WEIGHT_TIME_FAST;
tokens[1] = TOKEN_WEIGHT_TIME_SLOW;
} else {
tokens[0] = TOKEN_WEIGHT_TIME_SLOW;
tokens[1] = TOKEN_WEIGHT_TIME_FAST;
}
tokens[2] = -1;
if (cur_setting == 0) {
/* Didn't pick up device state yet. */
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == tokens[0])
/* Nothing to do. */
return SR_OK;
}
/* 51ms timeout seems to work best for this. */
ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_WEIGHT_TIME, tokens, 51);
return ret;
}
SR_PRIV int cem_dt_885x_holdmode_get(const struct sr_dev_inst *sdi,
gboolean *holdmode)
{
struct dev_context *devc;
int8_t tokens[5];
devc = sdi->priv;
if (devc->cur_mqflags == 0) {
tokens[0] = TOKEN_HOLD_MAX;
tokens[1] = TOKEN_HOLD_MIN;
tokens[2] = TOKEN_HOLD_NONE;
tokens[3] = -1;
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == TOKEN_HOLD_MAX)
devc->cur_mqflags = SR_MQFLAG_MAX;
else if (devc->token == TOKEN_HOLD_MIN)
devc->cur_mqflags = SR_MQFLAG_MIN;
}
*holdmode = devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN);
return SR_OK;
}
SR_PRIV int cem_dt_885x_holdmode_set(const struct sr_dev_inst *sdi, int holdmode)
{
struct dev_context *devc;
int cur_setting, ret;
int8_t tokens[5];
devc = sdi->priv;
/* The toggle below needs the desired state in first position. */
if (holdmode == SR_MQFLAG_MAX) {
tokens[0] = TOKEN_HOLD_MAX;
tokens[1] = TOKEN_HOLD_MIN;
tokens[2] = TOKEN_HOLD_NONE;
} else if (holdmode == SR_MQFLAG_MIN) {
tokens[0] = TOKEN_HOLD_MIN;
tokens[1] = TOKEN_HOLD_MAX;
tokens[2] = TOKEN_HOLD_NONE;
} else {
tokens[0] = TOKEN_HOLD_NONE;
tokens[1] = TOKEN_HOLD_MAX;
tokens[2] = TOKEN_HOLD_MIN;
}
tokens[3] = -1;
if (devc->cur_mqflags == 0) {
/* Didn't pick up device state yet. */
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
if (devc->token == tokens[0])
/* Nothing to do. */
return SR_OK;
} else {
cur_setting = devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN);
if (cur_setting == holdmode)
/* Already set correctly. */
return SR_OK;
}
/* 51ms timeout seems to work best for this. */
ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_HOLD_MAX_MIN, tokens, 51);
return ret;
}
SR_PRIV int cem_dt_885x_meas_range_get(const struct sr_dev_inst *sdi,
uint64_t *low, uint64_t *high)
{
struct dev_context *devc;
int8_t tokens[5];
devc = sdi->priv;
if (devc->cur_meas_range == 0) {
tokens[0] = TOKEN_MEAS_RANGE_30_130;
tokens[1] = TOKEN_MEAS_RANGE_30_80;
tokens[2] = TOKEN_MEAS_RANGE_50_100;
tokens[3] = TOKEN_MEAS_RANGE_80_130;
tokens[4] = -1;
if (wait_for_token(sdi, tokens, 0) != SR_OK)
return SR_ERR;
devc->cur_meas_range = devc->token;
}
switch (devc->cur_meas_range) {
case TOKEN_MEAS_RANGE_30_130:
*low = 30;
*high = 130;
break;
case TOKEN_MEAS_RANGE_30_80:
*low = 30;
*high = 80;
break;
case TOKEN_MEAS_RANGE_50_100:
*low = 50;
*high = 100;
break;
case TOKEN_MEAS_RANGE_80_130:
*low = 80;
*high = 130;
break;
default:
return SR_ERR;
}
return SR_OK;
}
SR_PRIV int cem_dt_885x_meas_range_set(const struct sr_dev_inst *sdi,
uint64_t low, uint64_t high)
{
struct dev_context *devc;
int ret;
int8_t token, tokens[6];
devc = sdi->priv;
if (low == 30 && high == 130)
token = TOKEN_MEAS_RANGE_30_130;
else if (low == 30 && high == 80)
token = TOKEN_MEAS_RANGE_30_80;
else if (low == 50 && high == 100)
token = TOKEN_MEAS_RANGE_50_100;
else if (low == 80 && high == 130)
token = TOKEN_MEAS_RANGE_80_130;
else
return SR_ERR;
sr_dbg("want 0x%.2x", token);
/* The toggle below needs the desired state in first position. */
tokens[0] = token;
tokens[1] = TOKEN_MEAS_RANGE_30_130;
tokens[2] = TOKEN_MEAS_RANGE_30_80;
tokens[3] = TOKEN_MEAS_RANGE_50_100;
tokens[4] = TOKEN_MEAS_RANGE_80_130;
tokens[5] = -1;
if (devc->cur_meas_range == 0) {
/* 110ms should be enough for two of these announcements */
if (wait_for_token(sdi, tokens, 110) != SR_OK)
return SR_ERR;
devc->cur_meas_range = devc->token;
}
if (devc->cur_meas_range == token)
/* Already set to this range. */
return SR_OK;
/* For measurement range, it works best to ignore announcements of the
* current setting and keep resending the toggle quickly. */
tokens[1] = -1;
ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_MEAS_RANGE, tokens, 11);
return ret;
}
SR_PRIV int cem_dt_885x_power_off(const struct sr_dev_inst *sdi)
{
struct sr_serial_dev_inst *serial;
char c, cmd;
serial = sdi->conn;
/* Reopen the port in non-blocking mode, so we can properly
* detect when the device stops communicating. */
serial_close(serial);
if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
return SR_ERR;
cmd = CMD_TOGGLE_POWER_OFF;
while (TRUE) {
serial_flush(serial);
if (serial_write(serial, (const void *)&cmd, 1) != 1)
return SR_ERR;
/* It never takes more than 23ms for the next token to arrive. */
g_usleep(25 * 1000);
if (serial_read(serial, &c, 1) != 1)
/* Device is no longer responding. Good! */
break;
}
/* In case the user manually turns on the device again, reset
* the port back to blocking. */
serial_close(serial);
serial_open(serial, SERIAL_RDWR);
return SR_OK;
}
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