[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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/*
 * 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;
	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 = (struct fs9721_info *)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 = (struct fs9721_info *)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 = (struct fs9721_info *)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 = (struct fs9721_info *)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 = (struct fs9721_info *)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 = (struct fs9721_info *)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
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/*
	23	* Fortune Semiconductor FS9721_LP3/FS9721B protocol parser.
	24	*
	25	* FS9721_LP3: 4000 counts (3 3/4 digits)
	26	* FS9721B/Q100: 2400 counts (3 2/3 digits)
	27	*
	28	* Same for both chips:
	29	* - Packages: Bare die (78 pins) or QFP-100
	30	* - Communication parameters: Unidirectional, 2400/8n1
	31	* - The protocol seems to be exactly the same.
	32	*/
	33
6ec6c43b	34	#include <config.h>
6c701476 UH	35	#include <string.h>
	36	#include <ctype.h>
	37	#include <math.h>
	38	#include <glib.h>
c1aae900	39	#include <libsigrok/libsigrok.h>
6c701476 UH	40	#include "libsigrok-internal.h"
6c701476 UH	41
3544f848	42	#define LOG_PREFIX "fs9721"
6c701476 UH	43
	44	static int parse_digit(uint8_t b)
	45	{
	46	switch (b) {
	47	case 0x7d:
	48	return 0;
	49	case 0x05:
	50	return 1;
	51	case 0x5b:
	52	return 2;
	53	case 0x1f:
	54	return 3;
	55	case 0x27:
	56	return 4;
	57	case 0x3e:
	58	return 5;
	59	case 0x7e:
	60	return 6;
	61	case 0x15:
	62	return 7;
	63	case 0x7f:
	64	return 8;
	65	case 0x3f:
	66	return 9;
	67	default:
ec5186f9	68	sr_dbg("Invalid digit byte: 0x%02x.", b);
6c701476 UH	69	return -1;
	70	}
	71	}
	72
8c1adf37 UH	73	static gboolean sync_nibbles_valid(const uint8_t *buf)
	74	{
	75	int i;
	76
	77	/* Check the synchronization nibbles, and make sure they all match. */
	78	for (i = 0; i < FS9721_PACKET_SIZE; i++) {
	79	if (((buf[i] >> 4) & 0x0f) != (i + 1)) {
ec5186f9	80	sr_dbg("Sync nibble in byte %d (0x%02x) is invalid.",
8c1adf37 UH	81	i, buf[i]);
	82	return FALSE;
	83	}
	84	}
	85
	86	return TRUE;
	87	}
	88
	89	static gboolean flags_valid(const struct fs9721_info *info)
	90	{
	91	int count;
	92
	93	/* Does the packet have more than one multiplier? */
	94	count = 0;
	95	count += (info->is_nano) ? 1 : 0;
	96	count += (info->is_micro) ? 1 : 0;
	97	count += (info->is_milli) ? 1 : 0;
	98	count += (info->is_kilo) ? 1 : 0;
	99	count += (info->is_mega) ? 1 : 0;
	100	if (count > 1) {
ec5186f9	101	sr_dbg("More than one multiplier detected in packet.");
8c1adf37 UH	102	return FALSE;
	103	}
	104
	105	/* Does the packet "measure" more than one type of value? */
	106	count = 0;
	107	count += (info->is_hz) ? 1 : 0;
	108	count += (info->is_ohm) ? 1 : 0;
	109	count += (info->is_farad) ? 1 : 0;
	110	count += (info->is_ampere) ? 1 : 0;
	111	count += (info->is_volt) ? 1 : 0;
	112	count += (info->is_percent) ? 1 : 0;
	113	if (count > 1) {
ec5186f9	114	sr_dbg("More than one measurement type detected in packet.");
8c1adf37 UH	115	return FALSE;
	116	}
	117
	118	/* Both AC and DC set? */
	119	if (info->is_ac && info->is_dc) {
ec5186f9	120	sr_dbg("Both AC and DC flags detected in packet.");
8c1adf37 UH	121	return FALSE;
	122	}
	123
	124	/* RS232 flag not set? */
	125	if (!info->is_rs232) {
ec5186f9	126	sr_dbg("No RS232 flag detected in packet.");
8c1adf37 UH	127	return FALSE;
	128	}
	129
	130	return TRUE;
	131	}
	132
70e28e78	133	static int parse_value(const uint8_t buf, float result, int *exponent)
6c701476 UH	134	{
	135	int i, sign, intval = 0, digits[4];
	136	uint8_t digit_bytes[4];
	137	float floatval;
	138
	139	/* Byte 1: LCD SEG2 */
	140	sign = ((buf[1] & (1 << 3)) != 0) ? -1 : 1;
	141
	142	/*
	143	* Bytes 1-8: Value (4 decimal digits, sign, decimal point)
	144	*
	145	* Over limit: "0L" (LCD), 0x00 0x7d 0x68 0x00 (digit bytes).
	146	*/
	147
	148	/* Merge the two nibbles for a digit into one byte. */
	149	for (i = 0; i < 4; i++) {
	150	digit_bytes[i] = ((buf[1 + (i * 2)] & 0x0f) << 4);
	151	digit_bytes[i] \|= (buf[1 + (i * 2) + 1] & 0x0f);
	152
	153	/* Bit 7 in the byte is not part of the digit. */
	154	digit_bytes[i] &= ~(1 << 7);
	155	}
	156
	157	/* Check for "OL". */
	158	if (digit_bytes[0] == 0x00 && digit_bytes[1] == 0x7d &&
	159	digit_bytes[2] == 0x68 && digit_bytes[3] == 0x00) {
	160	sr_spew("Over limit.");
	161	*result = INFINITY;
	162	return SR_OK;
	163	}
	164
	165	/* Parse the digits. */
	166	for (i = 0; i < 4; i++)
	167	digits[i] = parse_digit(digit_bytes[i]);
	168	sr_spew("Digits: %02x %02x %02x %02x (%d%d%d%d).",
	169	digit_bytes[0], digit_bytes[1], digit_bytes[2], digit_bytes[3],
	170	digits[0], digits[1], digits[2], digits[3]);
	171
	172	/* Merge all digits into an integer value. */
	173	for (i = 0; i < 4; i++) {
	174	intval *= 10;
	175	intval += digits[i];
	176	}
	177
6c701476 UH	178	floatval = (float)intval;
	179
	180	/* Decimal point position. */
	181	if ((buf[3] & (1 << 3)) != 0) {
70e28e78	182	*exponent = -3;
6c701476 UH	183	sr_spew("Decimal point after first digit.");
6c701476 UH	184	} else if ((buf[5] & (1 << 3)) != 0) {
70e28e78	185	*exponent = -2;
6c701476 UH	186	sr_spew("Decimal point after second digit.");
6c701476 UH	187	} else if ((buf[7] & (1 << 3)) != 0) {
70e28e78	188	*exponent = -1;
6c701476 UH	189	sr_spew("Decimal point after third digit.");
6c701476 UH	190	} else {
70e28e78	191	*exponent = 0;
6c701476 UH	192	sr_spew("No decimal point in the number.");
	193	}
	194
	195	/* Apply sign. */
	196	floatval *= sign;
	197
	198	sr_spew("The display value is %f.", floatval);
	199
	200	*result = floatval;
	201
	202	return SR_OK;
	203	}
	204
8c1adf37	205	static void parse_flags(const uint8_t buf, struct fs9721_info info)
6c701476	206	{
6c701476	207	/* Byte 0: LCD SEG1 */
8c1adf37 UH	208	info->is_ac = (buf[0] & (1 << 3)) != 0;
	209	info->is_dc = (buf[0] & (1 << 2)) != 0;
	210	info->is_auto = (buf[0] & (1 << 1)) != 0;
	211	info->is_rs232 = (buf[0] & (1 << 0)) != 0;
	212
	213	/* Byte 1: LCD SEG2 */
	214	info->is_sign = (buf[1] & (1 << 3)) != 0;
6c701476 UH	215
6c701476 UH	216	/* Byte 9: LCD SEG10 */
8c1adf37 UH	217	info->is_micro = (buf[9] & (1 << 3)) != 0;
	218	info->is_nano = (buf[9] & (1 << 2)) != 0;
	219	info->is_kilo = (buf[9] & (1 << 1)) != 0;
	220	info->is_diode = (buf[9] & (1 << 0)) != 0;
6c701476 UH	221
6c701476 UH	222	/* Byte 10: LCD SEG11 */
8c1adf37 UH	223	info->is_milli = (buf[10] & (1 << 3)) != 0;
	224	info->is_percent = (buf[10] & (1 << 2)) != 0;
	225	info->is_mega = (buf[10] & (1 << 1)) != 0;
	226	info->is_beep = (buf[10] & (1 << 0)) != 0;
6c701476 UH	227
6c701476 UH	228	/* Byte 11: LCD SEG12 */
8c1adf37 UH	229	info->is_farad = (buf[11] & (1 << 3)) != 0;
	230	info->is_ohm = (buf[11] & (1 << 2)) != 0;
	231	info->is_rel = (buf[11] & (1 << 1)) != 0;
	232	info->is_hold = (buf[11] & (1 << 0)) != 0;
6c701476 UH	233
6c701476 UH	234	/* Byte 12: LCD SEG13 */
8c1adf37 UH	235	info->is_ampere = (buf[12] & (1 << 3)) != 0;
	236	info->is_volt = (buf[12] & (1 << 2)) != 0;
	237	info->is_hz = (buf[12] & (1 << 1)) != 0;
	238	info->is_bat = (buf[12] & (1 << 0)) != 0;
6c701476 UH	239
6c701476 UH	240	/* Byte 13: LCD SEG14 */
8c1adf37 UH	241	info->is_c2c1_11 = (buf[13] & (1 << 3)) != 0;
	242	info->is_c2c1_10 = (buf[13] & (1 << 2)) != 0;
	243	info->is_c2c1_01 = (buf[13] & (1 << 1)) != 0;
	244	info->is_c2c1_00 = (buf[13] & (1 << 0)) != 0;
	245	}
6c701476	246
b02bb45f	247	static void handle_flags(struct sr_datafeed_analog analog, float floatval,
70e28e78	248	int exponent, const struct fs9721_info info)
8c1adf37	249	{
6c701476	250	/* Factors */
8c1adf37	251	if (info->is_nano)
70e28e78	252	*exponent -= 9;
8c1adf37	253	if (info->is_micro)
70e28e78	254	*exponent -= 6;
8c1adf37	255	if (info->is_milli)
70e28e78	256	*exponent -= 3;
8c1adf37	257	if (info->is_kilo)
70e28e78	258	*exponent += 3;
8c1adf37	259	if (info->is_mega)
70e28e78 AJ	260	*exponent += 6;
70e28e78 AJ	261	floatval = powf(10, *exponent);
6c701476 UH	262
6c701476 UH	263	/* Measurement modes */
8c1adf37	264	if (info->is_volt) {
b02bb45f UH	265	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	266	analog->meaning->unit = SR_UNIT_VOLT;
6c701476	267	}
8c1adf37	268	if (info->is_ampere) {
b02bb45f UH	269	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	270	analog->meaning->unit = SR_UNIT_AMPERE;
6c701476	271	}
8c1adf37	272	if (info->is_ohm) {
b02bb45f UH	273	analog->meaning->mq = SR_MQ_RESISTANCE;
b02bb45f UH	274	analog->meaning->unit = SR_UNIT_OHM;
6c701476	275	}
8c1adf37	276	if (info->is_hz) {
b02bb45f UH	277	analog->meaning->mq = SR_MQ_FREQUENCY;
b02bb45f UH	278	analog->meaning->unit = SR_UNIT_HERTZ;
6c701476	279	}
8c1adf37	280	if (info->is_farad) {
b02bb45f UH	281	analog->meaning->mq = SR_MQ_CAPACITANCE;
b02bb45f UH	282	analog->meaning->unit = SR_UNIT_FARAD;
6c701476	283	}
8c1adf37	284	if (info->is_beep) {
b02bb45f UH	285	analog->meaning->mq = SR_MQ_CONTINUITY;
b02bb45f UH	286	analog->meaning->unit = SR_UNIT_BOOLEAN;
8c1adf37	287	floatval = (floatval == INFINITY) ? 0.0 : 1.0;
6c701476	288	}
8c1adf37	289	if (info->is_diode) {
b02bb45f UH	290	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	291	analog->meaning->unit = SR_UNIT_VOLT;
6c701476	292	}
8c1adf37	293	if (info->is_percent) {
b02bb45f UH	294	analog->meaning->mq = SR_MQ_DUTY_CYCLE;
b02bb45f UH	295	analog->meaning->unit = SR_UNIT_PERCENTAGE;
6c701476 UH	296	}
	297
	298	/* Measurement related flags */
8c1adf37	299	if (info->is_ac)
b02bb45f	300	analog->meaning->mqflags \|= SR_MQFLAG_AC;
8c1adf37	301	if (info->is_dc)
b02bb45f	302	analog->meaning->mqflags \|= SR_MQFLAG_DC;
8c1adf37	303	if (info->is_auto)
b02bb45f	304	analog->meaning->mqflags \|= SR_MQFLAG_AUTORANGE;
a6ed50f4	305	if (info->is_diode)
b02bb45f	306	analog->meaning->mqflags \|= SR_MQFLAG_DIODE;
8c1adf37	307	if (info->is_hold)
b02bb45f	308	analog->meaning->mqflags \|= SR_MQFLAG_HOLD;
8c1adf37	309	if (info->is_rel)
b02bb45f	310	analog->meaning->mqflags \|= SR_MQFLAG_RELATIVE;
6c701476 UH	311
6c701476 UH	312	/* Other flags */
8c1adf37	313	if (info->is_rs232)
6c701476	314	sr_spew("RS232 enabled.");
8c1adf37	315	if (info->is_bat)
6c701476	316	sr_spew("Battery is low.");
8c1adf37	317	if (info->is_c2c1_00)
6c701476	318	sr_spew("User-defined LCD symbol 0 is active.");
8c1adf37	319	if (info->is_c2c1_01)
6c701476	320	sr_spew("User-defined LCD symbol 1 is active.");
8c1adf37	321	if (info->is_c2c1_10)
6c701476	322	sr_spew("User-defined LCD symbol 2 is active.");
8c1adf37	323	if (info->is_c2c1_11)
6c701476	324	sr_spew("User-defined LCD symbol 3 is active.");
8c1adf37	325	}
6c701476	326
8c1adf37 UH	327	SR_PRIV gboolean sr_fs9721_packet_valid(const uint8_t *buf)
	328	{
	329	struct fs9721_info info;
	330
	331	parse_flags(buf, &info);
	332
	333	return (sync_nibbles_valid(buf) && flags_valid(&info));
6c701476 UH	334	}
	335
	336	/**
	337	* Parse a protocol packet.
	338	*
93357bc3	339	* @param buf Buffer containing the 14-byte protocol packet. Must not be NULL.
8c1adf37	340	* @param floatval Pointer to a float variable. That variable will contain the
f3f19d11	341	* result value upon parsing success. Must not be NULL.
b02bb45f	342	* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
6c701476	343	* filled with data according to the protocol packet.
93357bc3	344	* Must not be NULL.
8c1adf37	345	* @param info Pointer to a struct fs9721_info. The struct will be filled
93357bc3	346	* with data according to the protocol packet. Must not be NULL.
6c701476 UH	347	*
	348	* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
	349	* 'analog' variable contents are undefined and should not be used.
	350	*/
8c1adf37	351	SR_PRIV int sr_fs9721_parse(const uint8_t buf, float floatval,
b02bb45f	352	struct sr_datafeed_analog analog, void info)
6c701476	353	{
70e28e78	354	int ret, exponent = 0;
93357bc3 UH	355	struct fs9721_info *info_local;
	356
	357	info_local = (struct fs9721_info *)info;
6c701476	358
70e28e78	359	if ((ret = parse_value(buf, floatval, &exponent)) != SR_OK) {
ec5186f9	360	sr_dbg("Error parsing value: %d.", ret);
6c701476 UH	361	return ret;
	362	}
	363
93357bc3	364	parse_flags(buf, info_local);
70e28e78 AJ	365	handle_flags(analog, floatval, &exponent, info_local);
	366
	367	analog->encoding->digits = -exponent;
	368	analog->spec->spec_digits = -exponent;
6c701476 UH	369
	370	return SR_OK;
	371	}
48535594	372
b02bb45f	373	SR_PRIV void sr_fs9721_00_temp_c(struct sr_datafeed_analog analog, void info)
48535594 UH	374	{
	375	struct fs9721_info *info_local;
	376
	377	info_local = (struct fs9721_info *)info;
	378
	379	/* User-defined FS9721_LP3 flag 'c2c1_00' means temperature (C). */
	380	if (info_local->is_c2c1_00) {
b02bb45f UH	381	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	382	analog->meaning->unit = SR_UNIT_CELSIUS;
48535594 UH	383	}
48535594 UH	384	}
2451a20f	385
b02bb45f	386	SR_PRIV void sr_fs9721_01_temp_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	387	{
	388	struct fs9721_info *info_local;
	389
	390	info_local = (struct fs9721_info *)info;
	391
	392	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	393	if (info_local->is_c2c1_01) {
b02bb45f UH	394	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	395	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	396	}
	397	}
	398
b02bb45f	399	SR_PRIV void sr_fs9721_10_temp_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	400	{
	401	struct fs9721_info *info_local;
	402
	403	info_local = (struct fs9721_info *)info;
	404
	405	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	406	if (info_local->is_c2c1_10) {
b02bb45f UH	407	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	408	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	409	}
	410	}
	411
b02bb45f	412	SR_PRIV void sr_fs9721_01_10_temp_f_c(struct sr_datafeed_analog analog, void info)
2451a20f UH	413	{
	414	struct fs9721_info *info_local;
	415
	416	info_local = (struct fs9721_info *)info;
	417
	418	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (F). */
	419	if (info_local->is_c2c1_01) {
b02bb45f UH	420	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	421	analog->meaning->unit = SR_UNIT_FAHRENHEIT;
2451a20f UH	422	}
	423
	424	/* User-defined FS9721_LP3 flag 'c2c1_10' means temperature (C). */
	425	if (info_local->is_c2c1_10) {
b02bb45f UH	426	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	427	analog->meaning->unit = SR_UNIT_CELSIUS;
2451a20f UH	428	}
2451a20f UH	429	}
d327972b	430
b02bb45f	431	SR_PRIV void sr_fs9721_max_c_min(struct sr_datafeed_analog analog, void info)
d327972b UH	432	{
	433	struct fs9721_info *info_local;
	434
	435	info_local = (struct fs9721_info *)info;
	436
	437	/* User-defined FS9721_LP3 flag 'c2c1_00' means MAX. */
	438	if (info_local->is_c2c1_00)
b02bb45f	439	analog->meaning->mqflags \|= SR_MQFLAG_MAX;
d327972b UH	440
	441	/* User-defined FS9721_LP3 flag 'c2c1_01' means temperature (C). */
	442	if (info_local->is_c2c1_01) {
b02bb45f UH	443	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	444	analog->meaning->unit = SR_UNIT_CELSIUS;
d327972b UH	445	}
	446
	447	/* User-defined FS9721_LP3 flag 'c2c1_11' means MIN. */
	448	if (info_local->is_c2c1_11)
b02bb45f	449	analog->meaning->mqflags \|= SR_MQFLAG_MIN;
d327972b UH	450
d327972b UH	451	}