369 lines
9.2 KiB
C
369 lines
9.2 KiB
C
/*
|
|
* This file is part of the sigrok project.
|
|
*
|
|
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 <glib.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include "libsigrok.h"
|
|
#include "libsigrok-internal.h"
|
|
#include "protocol.h"
|
|
|
|
static gboolean lcd14_is_sync_valid(const struct lcd14_packet *packet)
|
|
{
|
|
int i;
|
|
uint8_t sync;
|
|
|
|
/* Check the syncronization nibbles, and make sure they all match. */
|
|
for (i = 0; i < LCD14_PACKET_SIZE; i++) {
|
|
sync = (packet->raw[i] & LCD14_SYNC_MASK) >> 4;
|
|
if (sync != (i + 1))
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean lcd14_is_selection_good(const struct lcd14_data *data)
|
|
{
|
|
int n_postfix = 0, n_type = 0;
|
|
|
|
/* Does the packet have more than one multiplier? */
|
|
if (data->flags & LCD14_NANO)
|
|
n_postfix++;
|
|
if (data->flags & LCD14_MICRO)
|
|
n_postfix++;
|
|
if (data->flags & LCD14_MILLI)
|
|
n_postfix++;
|
|
if (data->flags & LCD14_KILO)
|
|
n_postfix++;
|
|
if (data->flags & LCD14_MEGA)
|
|
n_postfix++;
|
|
|
|
if (n_postfix > 1)
|
|
return FALSE;
|
|
|
|
/* Does the packet "measure" more than one type of value? */
|
|
if (data->flags & LCD14_HZ)
|
|
n_type++;
|
|
if (data->flags & LCD14_OHM)
|
|
n_type++;
|
|
if (data->flags & LCD14_FARAD)
|
|
n_type++;
|
|
if (data->flags & LCD14_AMP)
|
|
n_type++;
|
|
if (data->flags & LCD14_VOLT)
|
|
n_type++;
|
|
if (data->flags & LCD14_DUTY)
|
|
n_type++;
|
|
if (data->flags & LCD14_CELSIUS)
|
|
n_type++;
|
|
/* Do not test for hFE. hFE is not implemented and always '1'. */
|
|
if (n_type > 1)
|
|
return FALSE;
|
|
|
|
/* Both AC and DC? */
|
|
if ((data->flags & LCD14_AC) && (data->flags & LCD14_DC))
|
|
return FALSE;
|
|
|
|
/* OK, no duplicates. */
|
|
return TRUE;
|
|
}
|
|
|
|
/* We "cook" a raw lcd14_pcaket into a more pallatable form, lcd14_data. */
|
|
static void lcd14_cook_raw(const struct lcd14_packet *packet,
|
|
struct lcd14_data *data)
|
|
{
|
|
int i, j;
|
|
|
|
/* Get the digits out. */
|
|
for (i = 0; i < 4; i++) {
|
|
j = (i << 1) + 1;
|
|
data->digit[i] = ((packet->raw[j] & ~LCD14_SYNC_MASK) << 4) |
|
|
((packet->raw[j + 1] & ~LCD14_SYNC_MASK));
|
|
}
|
|
|
|
/* Now extract the flags. */
|
|
data->flags = ((packet->raw[0] & ~LCD14_SYNC_MASK) << 20) |
|
|
((packet->raw[9] & ~LCD14_SYNC_MASK) << 16) |
|
|
((packet->raw[10] & ~LCD14_SYNC_MASK) << 12) |
|
|
((packet->raw[11] & ~LCD14_SYNC_MASK) << 8) |
|
|
((packet->raw[12] & ~LCD14_SYNC_MASK) << 4) |
|
|
((packet->raw[13] & ~LCD14_SYNC_MASK));
|
|
}
|
|
|
|
/*
|
|
* Since the DMM does not identify itself in any way shape, or form, we really
|
|
* don't know for sure who is sending the data. We must use every possible
|
|
* check to filter out bad packets, especially since the detection mechanism
|
|
* depends on how well we can filter out bad packets packets.
|
|
*/
|
|
SR_PRIV gboolean lcd14_is_packet_valid(const struct lcd14_packet *packet,
|
|
struct lcd14_data *data)
|
|
{
|
|
struct lcd14_data placeholder;
|
|
|
|
/* Callers not interested in the data, pass NULL. */
|
|
if (data == NULL)
|
|
data = &placeholder;
|
|
|
|
if (!lcd14_is_sync_valid(packet))
|
|
return FALSE;
|
|
|
|
lcd14_cook_raw(packet, data);
|
|
|
|
if (!lcd14_is_selection_good(data))
|
|
return FALSE;
|
|
|
|
/* If we made it here, this looks to be a valid packet. */
|
|
return TRUE;
|
|
}
|
|
|
|
static uint8_t lcd14_to_digit(uint8_t raw_digit)
|
|
{
|
|
/* Take out the decimal point, so we can use a simple switch(). */
|
|
raw_digit &= ~LCD14_DP_MASK;
|
|
|
|
switch (raw_digit) {
|
|
case 0x00:
|
|
case LCD14_LCD_0:
|
|
return 0;
|
|
case LCD14_LCD_1:
|
|
return 1;
|
|
case LCD14_LCD_2:
|
|
return 2;
|
|
case LCD14_LCD_3:
|
|
return 3;
|
|
case LCD14_LCD_4:
|
|
return 4;
|
|
case LCD14_LCD_5:
|
|
return 5;
|
|
case LCD14_LCD_6:
|
|
return 6;
|
|
case LCD14_LCD_7:
|
|
return 7;
|
|
case LCD14_LCD_8:
|
|
return 8;
|
|
case LCD14_LCD_9:
|
|
return 9;
|
|
default:
|
|
return LCD14_LCD_INVALID;
|
|
}
|
|
}
|
|
|
|
/* Get a raw floating point value from the data. */
|
|
static double lcdraw_to_double(struct lcd14_data *data)
|
|
{
|
|
double rawval;
|
|
double multiplier = 1;
|
|
uint8_t digit, raw_digit;
|
|
gboolean dp_reached = FALSE;
|
|
int i;
|
|
|
|
/* We have 4 digits, and we start from the most significant. */
|
|
for (i = 0; i < 4; i++) {
|
|
raw_digit = data->digit[i];
|
|
digit = lcd14_to_digit(raw_digit);
|
|
if (digit == LCD14_LCD_INVALID) {
|
|
rawval = NAN;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Digit 1 does not have a decimal point. Instead, the decimal
|
|
* point is used to indicate MAX, so we must avoid testing it.
|
|
*/
|
|
if ((i > 0) && (raw_digit & LCD14_DP_MASK))
|
|
dp_reached = TRUE;
|
|
if (dp_reached)
|
|
multiplier /= 10;
|
|
rawval = rawval * 10 + digit;
|
|
}
|
|
rawval *= multiplier;
|
|
if (data->digit[0] & LCD14_D0_NEG)
|
|
rawval *= -1;
|
|
|
|
/* See if we need to multiply our raw value by anything. */
|
|
if (data->flags & LCD14_NANO)
|
|
rawval *= 1E-9;
|
|
else if (data->flags & LCD14_MICRO)
|
|
rawval *= 1E-6;
|
|
else if (data->flags & LCD14_MILLI)
|
|
rawval *= 1E-3;
|
|
else if (data->flags & LCD14_KILO)
|
|
rawval *= 1E3;
|
|
else if (data->flags & LCD14_MEGA)
|
|
rawval *= 1E6;
|
|
|
|
return rawval;
|
|
}
|
|
|
|
/* Now see what the value means, and pass that on. */
|
|
static void lcd14_handle_packet(struct lcd14_data *data,
|
|
struct dev_context *devc)
|
|
{
|
|
double rawval;
|
|
struct sr_datafeed_packet packet;
|
|
struct sr_datafeed_analog *analog;
|
|
|
|
if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog)))) {
|
|
sr_err("Failed to malloc packet.");
|
|
return;
|
|
}
|
|
|
|
if (!(analog->data = g_try_malloc(sizeof(float)))) {
|
|
sr_err("Failed to malloc data.");
|
|
g_free(analog);
|
|
return;
|
|
}
|
|
|
|
rawval = lcdraw_to_double(data);
|
|
|
|
analog->num_samples = 1;
|
|
*analog->data = (float)rawval;
|
|
|
|
analog->mq = -1;
|
|
|
|
/* What does the data mean? */
|
|
if (data->flags & LCD14_VOLT) {
|
|
analog->mq = SR_MQ_VOLTAGE;
|
|
analog->unit = SR_UNIT_VOLT;
|
|
if (data->flags & LCD14_AC)
|
|
analog->mqflags |= SR_MQFLAG_AC;
|
|
else
|
|
analog->mqflags |= SR_MQFLAG_DC;
|
|
} else if (data->flags & LCD14_AMP) {
|
|
analog->mq = SR_MQ_CURRENT;
|
|
analog->unit = SR_UNIT_AMPERE;
|
|
if (data->flags & LCD14_AC)
|
|
analog->mqflags |= SR_MQFLAG_AC;
|
|
else
|
|
analog->mqflags |= SR_MQFLAG_DC;
|
|
} else if (data->flags & LCD14_OHM) {
|
|
if (data->flags & LCD14_BEEP)
|
|
analog->mq = SR_MQ_CONTINUITY;
|
|
else
|
|
analog->mq = SR_MQ_RESISTANCE;
|
|
if (!isnan(rawval))
|
|
analog->unit = SR_UNIT_OHM;
|
|
else {
|
|
analog->unit = SR_UNIT_BOOLEAN;
|
|
*analog->data = FALSE;
|
|
}
|
|
} else if (data->flags & LCD14_FARAD) {
|
|
analog->mq = SR_MQ_CAPACITANCE;
|
|
analog->unit = SR_UNIT_FARAD;
|
|
} else if (data->flags & LCD14_CELSIUS) {
|
|
analog->mq = SR_MQ_TEMPERATURE;
|
|
/* No Kelvin or Fahrenheit from the device, just Celsius. */
|
|
analog->unit = SR_UNIT_CELSIUS;
|
|
} else if (data->flags & LCD14_HZ) {
|
|
analog->mq = SR_MQ_FREQUENCY;
|
|
analog->unit = SR_UNIT_HERTZ;
|
|
} else if (data->flags & LCD14_DUTY) {
|
|
analog->mq = SR_MQ_DUTY_CYCLE;
|
|
analog->unit = SR_UNIT_PERCENTAGE;
|
|
} else if (data->flags & LCD14_HFE) {
|
|
analog->mq = SR_MQ_GAIN;
|
|
analog->unit = SR_UNIT_UNITLESS;
|
|
} else if (data->flags & LCD14_DIODE) {
|
|
analog->mq = SR_MQ_VOLTAGE;
|
|
analog->unit = SR_UNIT_VOLT;
|
|
analog->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
|
|
} else {
|
|
sr_warn("Unable to identify measurement mode.");
|
|
}
|
|
|
|
/* What other flags are associated with the data? */
|
|
if (data->flags & LCD14_HOLD)
|
|
analog->mqflags |= SR_MQFLAG_HOLD;
|
|
if (data->flags & LCD14_AUTO)
|
|
analog->mqflags |= SR_MQFLAG_AUTORANGE;
|
|
if (data->flags & LCD14_REL)
|
|
analog->mqflags |= SR_MQFLAG_RELATIVE;
|
|
|
|
if (analog->mq != -1) {
|
|
/* Got a measurement. */
|
|
sr_spew("Measurement value is %f.", rawval);
|
|
packet.type = SR_DF_ANALOG;
|
|
packet.payload = analog;
|
|
sr_session_send(devc->cb_data, &packet);
|
|
devc->num_samples++;
|
|
}
|
|
|
|
g_free(analog->data);
|
|
g_free(analog);
|
|
}
|
|
|
|
static void handle_new_data(struct dev_context *devc, int fd)
|
|
{
|
|
int len, i, offset = 0;
|
|
struct lcd14_packet *packet;
|
|
struct lcd14_data data;
|
|
|
|
/* Try to get as much data as the buffer can hold. */
|
|
len = DMM_BUFSIZE - devc->buflen;
|
|
len = serial_read(fd, devc->buf + devc->buflen, len);
|
|
if (len < 1) {
|
|
sr_err("Serial port read error: %d.", len);
|
|
return;
|
|
}
|
|
devc->buflen += len;
|
|
|
|
/* Now look for packets in that data. */
|
|
while ((devc->buflen - offset) >= LCD14_PACKET_SIZE) {
|
|
packet = (void *)(devc->buf + offset);
|
|
if (lcd14_is_packet_valid(packet, &data)) {
|
|
lcd14_handle_packet(&data, devc);
|
|
offset += LCD14_PACKET_SIZE;
|
|
} else {
|
|
offset++;
|
|
}
|
|
}
|
|
|
|
/* If we have any data left, move it to the beginning of our buffer. */
|
|
for (i = 0; i < devc->buflen - offset; i++)
|
|
devc->buf[i] = devc->buf[offset + i];
|
|
devc->buflen -= offset;
|
|
}
|
|
|
|
SR_PRIV int tekpower_dmm_receive_data(int fd, int revents, void *cb_data)
|
|
{
|
|
const struct sr_dev_inst *sdi;
|
|
struct dev_context *devc;
|
|
|
|
if (!(sdi = cb_data))
|
|
return TRUE;
|
|
|
|
if (!(devc = sdi->priv))
|
|
return TRUE;
|
|
|
|
if (revents == G_IO_IN) {
|
|
/* Serial data arrived. */
|
|
handle_new_data(devc, fd);
|
|
}
|
|
|
|
if (devc->num_samples >= devc->limit_samples) {
|
|
sdi->driver->dev_acquisition_stop(sdi, cb_data);
|
|
return TRUE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|