[libsigrok.git] / src / dmm / fs9721.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 * 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 2 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/>.
 */

/*
 * Fortune Semiconductor FS9721_LP3/FS9721B protocol parser.
 *
 * FS9721_LP3: 4000 counts (3 3/4 digits)
 * FS9721B/Q100: 2400 counts (3 2/3 digits)
 *
 * Same for both chips:
 *  - Packages: Bare die (78 pins) or QFP-100
 *  - Communication parameters: Unidirectional, 2400/8n1
 *  - The protocol seems to be exactly the same.
 */

#include <config.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <glib.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

#define LOG_PREFIX "fs9721"

static int parse_digit(uint8_t b)
{
	switch (b) {
	case 0x7d:
		return 0;
	case 0x05:
		return 1;
	case 0x5b:
		return 2;
	case 0x1f:
		return 3;
	case 0x27:
		return 4;
	case 0x3e:
		return 5;
	case 0x7e:
		return 6;
	case 0x15:
		return 7;
	case 0x7f:
		return 8;
	case 0x3f:
		return 9;
	default:
		sr_dbg("Invalid digit byte: 0x%02x.", b);
		return -1;
	}
}

static gboolean sync_nibbles_valid(const uint8_t *buf)
{
	int i;

	/* Check the synchronization nibbles, and make sure they all match. */
	for (i = 0; i < FS9721_PACKET_SIZE; i++) {
		if (((buf[i] >> 4) & 0x0f) != (i + 1)) {
			sr_dbg("Sync nibble in byte %d (0x%02x) is invalid.",
			       i, buf[i]);
			return FALSE;
		}
	}

	return TRUE;
}

static gboolean flags_valid(const struct fs9721_info *info)
{
	int count;

	/* Does the packet have more than one multiplier? */
	count = 0;
	count += (info->is_nano) ? 1 : 0;
	count += (info->is_micro) ? 1 : 0;
	count += (info->is_milli) ? 1 : 0;
	count += (info->is_kilo) ? 1 : 0;
	count += (info->is_mega) ? 1 : 0;
	if (count > 1) {
		sr_dbg("More than one multiplier detected in packet.");
		return FALSE;
	}

	/* Does the packet "measure" more than one type of value? */
	count = 0;
	count += (info->is_hz) ? 1 : 0;
	count += (info->is_ohm) ? 1 : 0;
	count += (info->is_farad) ? 1 : 0;
	count += (info->is_ampere) ? 1 : 0;
	count += (info->is_volt) ? 1 : 0;
	count += (info->is_percent) ? 1 : 0;
	if (count > 1) {
		sr_dbg("More than one measurement type detected in packet.");
		return FALSE;
	}

	/* Both AC and DC set? */
	if (info->is_ac && info->is_dc) {
		sr_dbg("Both AC and DC flags detected in packet.");
		return FALSE;
	}

	/* RS232 flag not set? */
	if (!info->is_rs232) {
		sr_dbg("No RS232 flag detected in packet.");
		return FALSE;
	}

	return TRUE;
}

static int parse_value(const uint8_t *buf, float *result, int *exponent)
{
	int i, sign, intval = 0, digits[4];
	uint8_t digit_bytes[4];
	float floatval;

	/* Byte 1: LCD SEG2 */
	sign = ((buf[1] & (1 << 3)) != 0) ? -1 : 1;

	/*
	 * Bytes 1-8: Value (4 decimal digits, sign, decimal point)
	 *
	 * Over limit: "0L" (LCD), 0x00 0x7d 0x68 0x00 (digit bytes).
	 */

	/* Merge the two nibbles for a digit into one byte. */
	for (i = 0; i < 4; i++) {
		digit_bytes[i] = ((buf[1 + (i * 2)] & 0x0f) << 4);
		digit_bytes[i] |= (buf[1 + (i * 2) + 1] & 0x0f);

		/* Bit 7 in the byte is not part of the digit. */
		digit_bytes[i] &= ~(1 << 7);
	}

	/* Check for "OL". */
	if (digit_bytes[0] == 0x00 && digit_bytes[1] == 0x7d &&
	    digit_bytes[2] == 0x68 && digit_bytes[3] == 0x00) {
		sr_spew("Over limit.");
		*result = INFINITY;
		return SR_OK;
	}

	/* Parse the digits. */
	for (i = 0; i < 4; i++)
		digits[i] = parse_digit(digit_bytes[i]);
	sr_spew("Digits: %02x %02x %02x %02x (%d%d%d%d).",
		digit_bytes[0], digit_bytes[1], digit_bytes[2], digit_bytes[3],
		digits[0], digits[1], digits[2], digits[3]);

	/* Merge all digits into an integer value. */
	for (i = 0; i < 4; i++) {
		intval *= 10;
		intval += digits[i];
	}

	floatval = (float)intval;

	/* Decimal point position. */
	if ((buf[3] & (1 << 3)) != 0) {
		*exponent = -3;
		sr_spew("Decimal point after first digit.");
	} else if ((buf[5] & (1 << 3)) != 0) {
		*exponent = -2;
		sr_spew("Decimal point after second digit.");
	} else if ((buf[7] & (1 << 3)) != 0) {
		*exponent = -1;
		sr_spew("Decimal point after third digit.");
	} else {
		*exponent = 0;
		sr_spew("No decimal point in the number.");
	}

	/* Apply sign. */
	floatval *= sign;

	sr_spew("The display value is %f.", floatval);

	*result = floatval;

	return SR_OK;
}

static void parse_flags(const uint8_t *buf, struct fs9721_info *info)
{
	/* Byte 0: LCD SEG1 */
	info->is_ac         = (buf[0] & (1 << 3)) != 0;
	info->is_dc         = (buf[0] & (1 << 2)) != 0;
	info->is_auto       = (buf[0] & (1 << 1)) != 0;
	info->is_rs232      = (buf[0] & (1 << 0)) != 0;

	/* Byte 1: LCD SEG2 */
	info->is_sign       = (buf[1] & (1 << 3)) != 0;

	/* Byte 9: LCD SEG10 */
	info->is_micro      = (buf[9] & (1 << 3)) != 0;
	info->is_nano       = (buf[9] & (1 << 2)) != 0;
	info->is_kilo       = (buf[9] & (1 << 1)) != 0;
	info->is_diode      = (buf[9] & (1 << 0)) != 0;

	/* Byte 10: LCD SEG11 */
	info->is_milli      = (buf[10] & (1 << 3)) != 0;
	info->is_percent    = (buf[10] & (1 << 2)) != 0;
	info->is_mega       = (buf[10] & (1 << 1)) != 0;
	info->is_beep       = (buf[10] & (1 << 0)) != 0;

	/* Byte 11: LCD SEG12 */
	info->is_farad      = (buf[11] & (1 << 3)) != 0;
	info->is_ohm        = (buf[11] & (1 << 2)) != 0;
	info->is_rel        = (buf[11] & (1 << 1)) != 0;
	info->is_hold       = (buf[11] & (1 << 0)) != 0;

	/* Byte 12: LCD SEG13 */
	info->is_ampere     = (buf[12] & (1 << 3)) != 0;
	info->is_volt       = (buf[12] & (1 << 2)) != 0;
	info->is_hz         = (buf[12] & (1 << 1)) != 0;
	info->is_bat        = (buf[12] & (1 << 0)) != 0;

	/* Byte 13: LCD SEG14 */
	info->is_c2c1_11    = (buf[13] & (1 << 3)) != 0;
	info->is_c2c1_10    = (buf[13] & (1 << 2)) != 0;
	info->is_c2c1_01    = (buf[13] & (1 << 1)) != 0;
	info->is_c2c1_00    = (buf[13] & (1 << 0)) != 0;
}

static void handle_flags(struct sr_datafeed_analog *analog, float *floatval,
			 int *exponent, const struct fs9721_info *info)
{
	/* Factors */
	if (info->is_nano)
		*exponent -= 9;
	if (info->is_micro)
		*exponent -= 6;
	if (info->is_milli)
		*exponent -= 3;
	if (info->is_kilo)
		*exponent += 3;
	if (info->is_mega)
		*exponent += 6;
	*floatval *= powf(10, *exponent);

	/* Measurement modes */
	if (info->is_volt) {
		analog->meaning->mq = SR_MQ_VOLTAGE;
		analog->meaning->unit = SR_UNIT_VOLT;
	}
	if (info->is_ampere) {
		analog->meaning->mq = SR_MQ_CURRENT;
		analog->meaning->unit = SR_UNIT_AMPERE;
	}
	if (info->is_ohm) {
		analog->meaning->mq = SR_MQ_RESISTANCE;
		analog->meaning->unit = SR_UNIT_OHM;
	}
	if (info->is_hz) {
		analog->meaning->mq = SR_MQ_FREQUENCY;
		analog->meaning->unit = SR_UNIT_HERTZ;
	}
	if (info->is_farad) {
		analog->meaning->mq = SR_MQ_CAPACITANCE;
		analog->meaning->unit = SR_UNIT_FARAD;
	}
	if (info->is_beep) {
		analog->meaning->mq = SR_MQ_CONTINUITY;
		analog->meaning->unit = SR_UNIT_BOOLEAN;
		*floatval = (*floatval == INFINITY) ? 0.0 : 1.0;
	}
	if (info->is_diode) {
		analog->meaning->mq = SR_MQ_VOLTAGE;
		analog->meaning->unit = SR_UNIT_VOLT;
	}
	if (info->is_percent) {
		analog->meaning->mq = SR_MQ_DUTY_CYCLE;
		analog->meaning->unit = SR_UNIT_PERCENTAGE;
	}

	/* Measurement related flags */
	if (info->is_ac)
		analog->meaning->mqflags |= SR_MQFLAG_AC;
	if (info->is_dc)
		analog->meaning->mqflags |= SR_MQFLAG_DC;
	if (info->is_auto)
		analog->meaning->mqflags |= SR_MQFLAG_AUTORANGE;
	if (info->is_diode)
		analog->meaning->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
	if (info->is_hold)
		analog->meaning->mqflags |= SR_MQFLAG_HOLD;
	if (info->is_rel)
		analog->meaning->mqflags |= SR_MQFLAG_RELATIVE;

	/* Other flags */
	if (info->is_rs232)
		sr_spew("RS232 enabled.");
	if (info->is_bat)
		sr_spew("Battery is low.");
	if (info->is_c2c1_00)
		sr_spew("User-defined LCD symbol 0 is active.");
	if (info->is_c2c1_01)
		sr_spew("User-defined LCD symbol 1 is active.");
	if (info->is_c2c1_10)
		sr_spew("User-defined LCD symbol 2 is active.");
	if (info->is_c2c1_11)
		sr_spew("User-defined LCD symbol 3 is active.");
}

SR_PRIV gboolean sr_fs9721_packet_valid(const uint8_t *buf)
{
	struct fs9721_info info;

	parse_flags(buf, &info);

	return (sync_nibbles_valid(buf) && flags_valid(&info));
}

/**
 * Parse a protocol packet.
 *
 * @param buf Buffer containing the 14-byte protocol packet. Must not be NULL.
 * @param floatval Pointer to a float variable. That variable will contain the
 *                 result value upon parsing success. Must not be NULL.
 * @param analog Pointer to a struct sr_datafeed_analog. The struct will be
 *               filled with data according to the protocol packet.
 *               Must not be NULL.
 * @param info Pointer to a struct fs9721_info. The struct will be filled
 *             with data according to the protocol packet. Must not be NULL.
 *
 * @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
 *         'analog' variable contents are undefined and should not be used.
 */
SR_PRIV int sr_fs9721_parse(const uint8_t *buf, float *floatval,
			    struct sr_datafeed_analog *analog, void *info)
{
	int ret, exponent = 0;
	struct fs9721_info *info_local;

	info_local = info;

	if ((ret = parse_value(buf, floatval, &exponent)) != SR_OK) {
		sr_dbg("Error parsing value: %d.", ret);
		return ret;
	}

	parse_flags(buf, info_local);
	handle_flags(analog, floatval, &exponent, info_local);

	analog->encoding->digits = -exponent;
	analog->spec->spec_digits = -exponent;

	return SR_OK;
}

SR_PRIV void sr_fs9721_00_temp_c(struct sr_datafeed_analog *analog, void *info)
{
	struct fs9721_info *info_local;

	info_local = info;

	/* User-defined FS9721_LP3 flag 'c2c1_00' means temperature (C). */
	if (info_local->is_c2c1_00) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}
}

SR_PRIV void sr_fs9721_01_temp_c(struct sr_datafeed_analog *analog, void *info)
{
	struct fs9721_info *info_local;

	info_local = info;

	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	if (info_local->is_c2c1_01) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}
}

SR_PRIV void sr_fs9721_10_temp_c(struct sr_datafeed_analog *analog, void *info)
{
	struct fs9721_info *info_local;

	info_local = info;

	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	if (info_local->is_c2c1_10) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}
}

SR_PRIV void sr_fs9721_01_10_temp_f_c(struct sr_datafeed_analog *analog, void *info)
{
	struct fs9721_info *info_local;

	info_local = info;

	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (F). */
	if (info_local->is_c2c1_01) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_FAHRENHEIT;
	}

	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	if (info_local->is_c2c1_10) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}
}

SR_PRIV void sr_fs9721_max_c_min(struct sr_datafeed_analog *analog, void *info)
{
	struct fs9721_info *info_local;

	info_local = info;

	/* User-defined FS9721_LP3 flag 'c2c1_00' means MAX. */
	if (info_local->is_c2c1_00)
		analog->meaning->mqflags |= SR_MQFLAG_MAX;

	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	if (info_local->is_c2c1_01) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}

	/* User-defined FS9721_LP3 flag 'c2c1_11' means MIN. */
	if (info_local->is_c2c1_11)
		analog->meaning->mqflags |= SR_MQFLAG_MIN;

}
Commit	Line	Data
6c701476	1	/*
50985c20	2	* This file is part of the libsigrok project.
6c701476 UH	3	*
6c701476 UH	4	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
8c1adf37	5	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
6c701476 UH	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
2ea1fdf1	18	* along with this program; if not, see <http://www.gnu.org/licenses/>.
6c701476 UH	19	*/
	20
	21	/*
	22	* Fortune Semiconductor FS9721_LP3/FS9721B protocol parser.
	23	*
	24	* FS9721_LP3: 4000 counts (3 3/4 digits)
	25	* FS9721B/Q100: 2400 counts (3 2/3 digits)
	26	*
	27	* Same for both chips:
	28	* - Packages: Bare die (78 pins) or QFP-100
	29	* - Communication parameters: Unidirectional, 2400/8n1
	30	* - The protocol seems to be exactly the same.
	31	*/
	32
6ec6c43b	33	#include <config.h>
6c701476 UH	34	#include <string.h>
	35	#include <ctype.h>
	36	#include <math.h>
	37	#include <glib.h>
c1aae900	38	#include <libsigrok/libsigrok.h>
6c701476 UH	39	#include "libsigrok-internal.h"
6c701476 UH	40
3544f848	41	#define LOG_PREFIX "fs9721"
6c701476 UH	42
	43	static int parse_digit(uint8_t b)
	44	{
	45	switch (b) {
	46	case 0x7d:
	47	return 0;
	48	case 0x05:
	49	return 1;
	50	case 0x5b:
	51	return 2;
	52	case 0x1f:
	53	return 3;
	54	case 0x27:
	55	return 4;
	56	case 0x3e:
	57	return 5;
	58	case 0x7e:
	59	return 6;
	60	case 0x15:
	61	return 7;
	62	case 0x7f:
	63	return 8;
	64	case 0x3f:
	65	return 9;
	66	default:
ec5186f9	67	sr_dbg("Invalid digit byte: 0x%02x.", b);
6c701476 UH	68	return -1;
	69	}
	70	}
	71
8c1adf37 UH	72	static gboolean sync_nibbles_valid(const uint8_t *buf)
	73	{
	74	int i;
	75
	76	/* Check the synchronization nibbles, and make sure they all match. */
	77	for (i = 0; i < FS9721_PACKET_SIZE; i++) {
	78	if (((buf[i] >> 4) & 0x0f) != (i + 1)) {
ec5186f9	79	sr_dbg("Sync nibble in byte %d (0x%02x) is invalid.",
8c1adf37 UH	80	i, buf[i]);
	81	return FALSE;
	82	}
	83	}
	84
	85	return TRUE;
	86	}
	87
	88	static gboolean flags_valid(const struct fs9721_info *info)
	89	{
	90	int count;
	91
	92	/* Does the packet have more than one multiplier? */
	93	count = 0;
	94	count += (info->is_nano) ? 1 : 0;
	95	count += (info->is_micro) ? 1 : 0;
	96	count += (info->is_milli) ? 1 : 0;
	97	count += (info->is_kilo) ? 1 : 0;
	98	count += (info->is_mega) ? 1 : 0;
	99	if (count > 1) {
ec5186f9	100	sr_dbg("More than one multiplier detected in packet.");
8c1adf37 UH	101	return FALSE;
	102	}
	103
	104	/* Does the packet "measure" more than one type of value? */
	105	count = 0;
	106	count += (info->is_hz) ? 1 : 0;
	107	count += (info->is_ohm) ? 1 : 0;
	108	count += (info->is_farad) ? 1 : 0;
	109	count += (info->is_ampere) ? 1 : 0;
	110	count += (info->is_volt) ? 1 : 0;
	111	count += (info->is_percent) ? 1 : 0;
	112	if (count > 1) {
ec5186f9	113	sr_dbg("More than one measurement type detected in packet.");
8c1adf37 UH	114	return FALSE;
	115	}
	116
	117	/* Both AC and DC set? */
	118	if (info->is_ac && info->is_dc) {
ec5186f9	119	sr_dbg("Both AC and DC flags detected in packet.");
8c1adf37 UH	120	return FALSE;
	121	}
	122
	123	/* RS232 flag not set? */
	124	if (!info->is_rs232) {
ec5186f9	125	sr_dbg("No RS232 flag detected in packet.");
8c1adf37 UH	126	return FALSE;
	127	}
	128
	129	return TRUE;
	130	}
	131
70e28e78	132	static int parse_value(const uint8_t buf, float result, int *exponent)
6c701476 UH	133	{
	134	int i, sign, intval = 0, digits[4];
	135	uint8_t digit_bytes[4];
	136	float floatval;
	137
	138	/* Byte 1: LCD SEG2 */
	139	sign = ((buf[1] & (1 << 3)) != 0) ? -1 : 1;
	140
	141	/*
	142	* Bytes 1-8: Value (4 decimal digits, sign, decimal point)
	143	*
	144	* Over limit: "0L" (LCD), 0x00 0x7d 0x68 0x00 (digit bytes).
	145	*/
	146
	147	/* Merge the two nibbles for a digit into one byte. */
	148	for (i = 0; i < 4; i++) {
	149	digit_bytes[i] = ((buf[1 + (i * 2)] & 0x0f) << 4);
	150	digit_bytes[i] \|= (buf[1 + (i * 2) + 1] & 0x0f);
	151
	152	/* Bit 7 in the byte is not part of the digit. */
	153	digit_bytes[i] &= ~(1 << 7);
	154	}
	155
	156	/* Check for "OL". */
	157	if (digit_bytes[0] == 0x00 && digit_bytes[1] == 0x7d &&
	158	digit_bytes[2] == 0x68 && digit_bytes[3] == 0x00) {
	159	sr_spew("Over limit.");
	160	*result = INFINITY;
	161	return SR_OK;
	162	}
	163
	164	/* Parse the digits. */
	165	for (i = 0; i < 4; i++)
	166	digits[i] = parse_digit(digit_bytes[i]);
	167	sr_spew("Digits: %02x %02x %02x %02x (%d%d%d%d).",
	168	digit_bytes[0], digit_bytes[1], digit_bytes[2], digit_bytes[3],
	169	digits[0], digits[1], digits[2], digits[3]);
	170
	171	/* Merge all digits into an integer value. */
	172	for (i = 0; i < 4; i++) {
	173	intval *= 10;
	174	intval += digits[i];
	175	}
	176
6c701476 UH	177	floatval = (float)intval;
	178
	179	/* Decimal point position. */
	180	if ((buf[3] & (1 << 3)) != 0) {
70e28e78	181	*exponent = -3;
6c701476 UH	182	sr_spew("Decimal point after first digit.");
6c701476 UH	183	} else if ((buf[5] & (1 << 3)) != 0) {
70e28e78	184	*exponent = -2;
6c701476 UH	185	sr_spew("Decimal point after second digit.");
6c701476 UH	186	} else if ((buf[7] & (1 << 3)) != 0) {
70e28e78	187	*exponent = -1;
6c701476 UH	188	sr_spew("Decimal point after third digit.");
6c701476 UH	189	} else {
70e28e78	190	*exponent = 0;
6c701476 UH	191	sr_spew("No decimal point in the number.");
	192	}
	193
	194	/* Apply sign. */
	195	floatval *= sign;
	196
	197	sr_spew("The display value is %f.", floatval);
	198
	199	*result = floatval;
	200
	201	return SR_OK;
	202	}
	203
8c1adf37	204	static void parse_flags(const uint8_t buf, struct fs9721_info info)
6c701476	205	{
6c701476	206	/* Byte 0: LCD SEG1 */
8c1adf37 UH	207	info->is_ac = (buf[0] & (1 << 3)) != 0;
	208	info->is_dc = (buf[0] & (1 << 2)) != 0;
	209	info->is_auto = (buf[0] & (1 << 1)) != 0;
	210	info->is_rs232 = (buf[0] & (1 << 0)) != 0;
	211
	212	/* Byte 1: LCD SEG2 */
	213	info->is_sign = (buf[1] & (1 << 3)) != 0;
6c701476 UH	214
6c701476 UH	215	/* Byte 9: LCD SEG10 */
8c1adf37 UH	216	info->is_micro = (buf[9] & (1 << 3)) != 0;
	217	info->is_nano = (buf[9] & (1 << 2)) != 0;
	218	info->is_kilo = (buf[9] & (1 << 1)) != 0;
	219	info->is_diode = (buf[9] & (1 << 0)) != 0;
6c701476 UH	220
6c701476 UH	221	/* Byte 10: LCD SEG11 */
8c1adf37 UH	222	info->is_milli = (buf[10] & (1 << 3)) != 0;
	223	info->is_percent = (buf[10] & (1 << 2)) != 0;
	224	info->is_mega = (buf[10] & (1 << 1)) != 0;
	225	info->is_beep = (buf[10] & (1 << 0)) != 0;
6c701476 UH	226
6c701476 UH	227	/* Byte 11: LCD SEG12 */
8c1adf37 UH	228	info->is_farad = (buf[11] & (1 << 3)) != 0;
	229	info->is_ohm = (buf[11] & (1 << 2)) != 0;
	230	info->is_rel = (buf[11] & (1 << 1)) != 0;
	231	info->is_hold = (buf[11] & (1 << 0)) != 0;
6c701476 UH	232
6c701476 UH	233	/* Byte 12: LCD SEG13 */
8c1adf37 UH	234	info->is_ampere = (buf[12] & (1 << 3)) != 0;
	235	info->is_volt = (buf[12] & (1 << 2)) != 0;
	236	info->is_hz = (buf[12] & (1 << 1)) != 0;
	237	info->is_bat = (buf[12] & (1 << 0)) != 0;
6c701476 UH	238
6c701476 UH	239	/* Byte 13: LCD SEG14 */
8c1adf37 UH	240	info->is_c2c1_11 = (buf[13] & (1 << 3)) != 0;
	241	info->is_c2c1_10 = (buf[13] & (1 << 2)) != 0;
	242	info->is_c2c1_01 = (buf[13] & (1 << 1)) != 0;
	243	info->is_c2c1_00 = (buf[13] & (1 << 0)) != 0;
	244	}
6c701476	245
b02bb45f	246	static void handle_flags(struct sr_datafeed_analog analog, float floatval,
70e28e78	247	int exponent, const struct fs9721_info info)
8c1adf37	248	{
6c701476	249	/* Factors */
8c1adf37	250	if (info->is_nano)
70e28e78	251	*exponent -= 9;
8c1adf37	252	if (info->is_micro)
70e28e78	253	*exponent -= 6;
8c1adf37	254	if (info->is_milli)
70e28e78	255	*exponent -= 3;
8c1adf37	256	if (info->is_kilo)
70e28e78	257	*exponent += 3;
8c1adf37	258	if (info->is_mega)
70e28e78 AJ	259	*exponent += 6;
70e28e78 AJ	260	floatval = powf(10, *exponent);
6c701476 UH	261
6c701476 UH	262	/* Measurement modes */
8c1adf37	263	if (info->is_volt) {
b02bb45f UH	264	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	265	analog->meaning->unit = SR_UNIT_VOLT;
6c701476	266	}
8c1adf37	267	if (info->is_ampere) {
b02bb45f UH	268	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	269	analog->meaning->unit = SR_UNIT_AMPERE;
6c701476	270	}
8c1adf37	271	if (info->is_ohm) {
b02bb45f UH	272	analog->meaning->mq = SR_MQ_RESISTANCE;
b02bb45f UH	273	analog->meaning->unit = SR_UNIT_OHM;
6c701476	274	}
8c1adf37	275	if (info->is_hz) {
b02bb45f UH	276	analog->meaning->mq = SR_MQ_FREQUENCY;
b02bb45f UH	277	analog->meaning->unit = SR_UNIT_HERTZ;
6c701476	278	}
8c1adf37	279	if (info->is_farad) {
b02bb45f UH	280	analog->meaning->mq = SR_MQ_CAPACITANCE;
b02bb45f UH	281	analog->meaning->unit = SR_UNIT_FARAD;
6c701476	282	}
8c1adf37	283	if (info->is_beep) {
b02bb45f UH	284	analog->meaning->mq = SR_MQ_CONTINUITY;
b02bb45f UH	285	analog->meaning->unit = SR_UNIT_BOOLEAN;
8c1adf37	286	floatval = (floatval == INFINITY) ? 0.0 : 1.0;
6c701476	287	}
8c1adf37	288	if (info->is_diode) {
b02bb45f UH	289	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	290	analog->meaning->unit = SR_UNIT_VOLT;
6c701476	291	}
8c1adf37	292	if (info->is_percent) {
b02bb45f UH	293	analog->meaning->mq = SR_MQ_DUTY_CYCLE;
b02bb45f UH	294	analog->meaning->unit = SR_UNIT_PERCENTAGE;
6c701476 UH	295	}
	296
	297	/* Measurement related flags */
8c1adf37	298	if (info->is_ac)
b02bb45f	299	analog->meaning->mqflags \|= SR_MQFLAG_AC;
8c1adf37	300	if (info->is_dc)
b02bb45f	301	analog->meaning->mqflags \|= SR_MQFLAG_DC;
8c1adf37	302	if (info->is_auto)
b02bb45f	303	analog->meaning->mqflags \|= SR_MQFLAG_AUTORANGE;
a6ed50f4	304	if (info->is_diode)
64aa214a	305	analog->meaning->mqflags \|= SR_MQFLAG_DIODE \| SR_MQFLAG_DC;
8c1adf37	306	if (info->is_hold)
b02bb45f	307	analog->meaning->mqflags \|= SR_MQFLAG_HOLD;
8c1adf37	308	if (info->is_rel)
b02bb45f	309	analog->meaning->mqflags \|= SR_MQFLAG_RELATIVE;
6c701476 UH	310
6c701476 UH	311	/* Other flags */
8c1adf37	312	if (info->is_rs232)
6c701476	313	sr_spew("RS232 enabled.");
8c1adf37	314	if (info->is_bat)
6c701476	315	sr_spew("Battery is low.");
8c1adf37	316	if (info->is_c2c1_00)
6c701476	317	sr_spew("User-defined LCD symbol 0 is active.");
8c1adf37	318	if (info->is_c2c1_01)
6c701476	319	sr_spew("User-defined LCD symbol 1 is active.");
8c1adf37	320	if (info->is_c2c1_10)
6c701476	321	sr_spew("User-defined LCD symbol 2 is active.");
8c1adf37	322	if (info->is_c2c1_11)
6c701476	323	sr_spew("User-defined LCD symbol 3 is active.");
8c1adf37	324	}
6c701476	325
8c1adf37 UH	326	SR_PRIV gboolean sr_fs9721_packet_valid(const uint8_t *buf)
	327	{
	328	struct fs9721_info info;
	329
	330	parse_flags(buf, &info);
	331
	332	return (sync_nibbles_valid(buf) && flags_valid(&info));
6c701476 UH	333	}
	334
	335	/**
	336	* Parse a protocol packet.
	337	*
93357bc3	338	* @param buf Buffer containing the 14-byte protocol packet. Must not be NULL.
8c1adf37	339	* @param floatval Pointer to a float variable. That variable will contain the
f3f19d11	340	* result value upon parsing success. Must not be NULL.
b02bb45f	341	* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
6c701476	342	* filled with data according to the protocol packet.
93357bc3	343	* Must not be NULL.
8c1adf37	344	* @param info Pointer to a struct fs9721_info. The struct will be filled
93357bc3	345	* with data according to the protocol packet. Must not be NULL.
6c701476 UH	346	*
	347	* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
	348	* 'analog' variable contents are undefined and should not be used.
	349	*/
8c1adf37	350	SR_PRIV int sr_fs9721_parse(const uint8_t buf, float floatval,
b02bb45f	351	struct sr_datafeed_analog analog, void info)
6c701476	352	{
70e28e78	353	int ret, exponent = 0;
93357bc3 UH	354	struct fs9721_info *info_local;
93357bc3 UH	355
94b1d506	356	info_local = info;
6c701476	357
70e28e78	358	if ((ret = parse_value(buf, floatval, &exponent)) != SR_OK) {
ec5186f9	359	sr_dbg("Error parsing value: %d.", ret);
6c701476 UH	360	return ret;
	361	}
	362
93357bc3	363	parse_flags(buf, info_local);
70e28e78 AJ	364	handle_flags(analog, floatval, &exponent, info_local);
70e28e78 AJ	365
d9251a2c	366	analog->encoding->digits = -exponent;
70e28e78	367	analog->spec->spec_digits = -exponent;
6c701476 UH	368
	369	return SR_OK;
	370	}
48535594	371
b02bb45f	372	SR_PRIV void sr_fs9721_00_temp_c(struct sr_datafeed_analog analog, void info)
48535594 UH	373	{
	374	struct fs9721_info *info_local;
	375
94b1d506	376	info_local = info;
48535594 UH	377
	378	/* User-defined FS9721_LP3 flag 'c2c1_00' means temperature (C). */
	379	if (info_local->is_c2c1_00) {
b02bb45f UH	380	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	381	analog->meaning->unit = SR_UNIT_CELSIUS;
48535594 UH	382	}
48535594 UH	383	}
2451a20f	384
b02bb45f	385	SR_PRIV void sr_fs9721_01_temp_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	386	{
	387	struct fs9721_info *info_local;
	388
94b1d506	389	info_local = info;
2451a20f UH	390
	391	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	392	if (info_local->is_c2c1_01) {
b02bb45f UH	393	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	394	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	395	}
	396	}
	397
b02bb45f	398	SR_PRIV void sr_fs9721_10_temp_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	399	{
	400	struct fs9721_info *info_local;
	401
94b1d506	402	info_local = info;
2451a20f UH	403
	404	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	405	if (info_local->is_c2c1_10) {
b02bb45f UH	406	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	407	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	408	}
	409	}
	410
b02bb45f	411	SR_PRIV void sr_fs9721_01_10_temp_f_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	412	{
	413	struct fs9721_info *info_local;
	414
94b1d506	415	info_local = info;
2451a20f UH	416
	417	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (F). */
	418	if (info_local->is_c2c1_01) {
b02bb45f UH	419	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	420	analog->meaning->unit = SR_UNIT_FAHRENHEIT;
2451a20f UH	421	}
	422
	423	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	424	if (info_local->is_c2c1_10) {
b02bb45f UH	425	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	426	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	427	}
2451a20f UH	428	}
d327972b	429
b02bb45f	430	SR_PRIV void sr_fs9721_max_c_min(struct sr_datafeed_analog analog, void info)
d327972b UH	431	{
	432	struct fs9721_info *info_local;
	433
94b1d506	434	info_local = info;
d327972b UH	435
	436	/* User-defined FS9721_LP3 flag 'c2c1_00' means MAX. */
	437	if (info_local->is_c2c1_00)
b02bb45f	438	analog->meaning->mqflags \|= SR_MQFLAG_MAX;
d327972b UH	439
	440	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	441	if (info_local->is_c2c1_01) {
b02bb45f UH	442	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	443	analog->meaning->unit = SR_UNIT_CELSIUS;
d327972b UH	444	}
	445
	446	/* User-defined FS9721_LP3 flag 'c2c1_11' means MIN. */
	447	if (info_local->is_c2c1_11)
b02bb45f	448	analog->meaning->mqflags \|= SR_MQFLAG_MIN;
d327972b UH	449
d327972b UH	450	}