libsigrok/output/analog.c

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/*
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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 <string.h>
#include <math.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "output/analog: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
struct context {
int num_enabled_probes;
GPtrArray *probelist;
};
static int init(struct sr_output *o)
{
struct context *ctx;
struct sr_probe *probe;
GSList *l;
sr_spew("Initializing output module.");
if (!o || !o->sdi)
return SR_ERR_ARG;
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("Output module context malloc failed.");
return SR_ERR_MALLOC;
}
o->internal = ctx;
/* Get the number of probes and their names. */
ctx->probelist = g_ptr_array_new();
for (l = o->sdi->probes; l; l = l->next) {
probe = l->data;
if (!probe || !probe->enabled)
continue;
g_ptr_array_add(ctx->probelist, probe->name);
ctx->num_enabled_probes++;
}
return SR_OK;
}
static void si_printf(float value, GString *out, char *unitstr)
{
float v;
if (signbit(value))
v = -(value);
else
v = value;
if (v < 1e-12 || v > 1e+12)
g_string_append_printf(out, "%f %s", value, unitstr);
else if (v > 1e+9)
g_string_append_printf(out, "%f G%s", value / 1e+9, unitstr);
else if (v > 1e+6)
g_string_append_printf(out, "%f M%s", value / 1e+6, unitstr);
else if (v > 1e+3)
g_string_append_printf(out, "%f k%s", value / 1e+3, unitstr);
else if (v < 1e-9)
g_string_append_printf(out, "%f n%s", value * 1e+9, unitstr);
else if (v < 1e-6)
g_string_append_printf(out, "%f u%s", value * 1e+6, unitstr);
else if (v < 1e-3)
g_string_append_printf(out, "%f m%s", value * 1e+3, unitstr);
else
g_string_append_printf(out, "%f %s", value, unitstr);
}
static void fancyprint(int unit, int mqflags, float value, GString *out)
{
switch (unit) {
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case SR_UNIT_VOLT:
si_printf(value, out, "V");
break;
case SR_UNIT_AMPERE:
si_printf(value, out, "A");
break;
case SR_UNIT_OHM:
si_printf(value, out, "");
g_string_append_unichar(out, 0x2126);
break;
case SR_UNIT_FARAD:
si_printf(value, out, "F");
break;
case SR_UNIT_KELVIN:
si_printf(value, out, "K");
break;
case SR_UNIT_CELSIUS:
si_printf(value, out, "");
g_string_append_unichar(out, 0x00b0);
g_string_append_c(out, 'C');
break;
case SR_UNIT_FAHRENHEIT:
si_printf(value, out, "");
g_string_append_unichar(out, 0x00b0);
g_string_append_c(out, 'F');
break;
case SR_UNIT_HERTZ:
si_printf(value, out, "Hz");
break;
case SR_UNIT_PERCENTAGE:
g_string_append_printf(out, "%f%%", value);
break;
case SR_UNIT_BOOLEAN:
if (value > 0)
g_string_append_printf(out, "TRUE");
else
g_string_append_printf(out, "FALSE");
break;
case SR_UNIT_SECOND:
si_printf(value, out, "s");
break;
case SR_UNIT_SIEMENS:
si_printf(value, out, "S");
break;
case SR_UNIT_DECIBEL_MW:
si_printf(value, out, "dBu");
break;
case SR_UNIT_DECIBEL_VOLT:
si_printf(value, out, "dBV");
break;
case SR_UNIT_DECIBEL_SPL:
if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
si_printf(value, out, "dB(A)");
else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_C)
si_printf(value, out, "dB(C)");
else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_Z)
si_printf(value, out, "dB(Z)");
else
/* No frequency weighting, or non-standard "flat" */
si_printf(value, out, "dB(SPL)");
if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_S)
g_string_append(out, " S");
else if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
g_string_append(out, " F");
if (mqflags & SR_MQFLAG_SPL_LAT)
g_string_append(out, " LAT");
else if (mqflags & SR_MQFLAG_SPL_PCT_OVER_ALARM)
/* Not a standard function for SLMs, so this is
* a made-up notation. */
g_string_append(out, " %oA");
break;
case SR_UNIT_CONCENTRATION:
g_string_append_printf(out, "%f ppm", value * 1000000);
break;
default:
si_printf(value, out, "");
break;
}
if (mqflags & SR_MQFLAG_AC)
g_string_append_printf(out, " AC");
if (mqflags & SR_MQFLAG_DC)
g_string_append_printf(out, " DC");
if (mqflags & SR_MQFLAG_RMS)
g_string_append_printf(out, " RMS");
if (mqflags & SR_MQFLAG_DIODE)
g_string_append_printf(out, " DIODE");
if (mqflags & SR_MQFLAG_HOLD)
g_string_append_printf(out, " HOLD");
if (mqflags & SR_MQFLAG_MAX)
g_string_append_printf(out, " MAX");
if (mqflags & SR_MQFLAG_MIN)
g_string_append_printf(out, " MIN");
if (mqflags & SR_MQFLAG_AUTORANGE)
g_string_append_printf(out, " AUTO");
if (mqflags & SR_MQFLAG_RELATIVE)
g_string_append_printf(out, " REL");
g_string_append_c(out, '\n');
}
static int receive(struct sr_output *o, const struct sr_dev_inst *sdi,
const struct sr_datafeed_packet *packet, GString **out)
{
const struct sr_datafeed_analog *analog;
struct sr_probe *probe;
GSList *l;
const float *fdata;
int i, p;
(void)sdi;
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*out = NULL;
if (!o || !o->sdi)
return SR_ERR_ARG;
switch (packet->type) {
case SR_DF_FRAME_BEGIN:
*out = g_string_new("FRAME-BEGIN\n");
break;
case SR_DF_FRAME_END:
*out = g_string_new("FRAME-END\n");
break;
case SR_DF_ANALOG:
analog = packet->payload;
fdata = (const float *)analog->data;
*out = g_string_sized_new(512);
for (i = 0; i < analog->num_samples; i++) {
for (l = analog->probes, p = 0; l; l = l->next, p++) {
probe = l->data;
g_string_append_printf(*out, "%s: ", probe->name);
fancyprint(analog->unit, analog->mqflags,
fdata[i + p], *out);
}
}
break;
}
return SR_OK;
}
static int cleanup(struct sr_output *o)
{
struct context *ctx;
if (!o || !o->sdi)
return SR_ERR_ARG;
ctx = o->internal;
g_ptr_array_free(ctx->probelist, 1);
g_free(ctx);
o->internal = NULL;
return SR_OK;
}
SR_PRIV struct sr_output_format output_analog = {
.id = "analog",
.description = "Analog data",
.df_type = SR_DF_ANALOG,
.init = init,
.receive = receive,
.cleanup = cleanup
};