[libsigrok.git] / hardware / common / dmm / fs9922.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 FS9922-DMM3/FS9922-DMM4 protocol parser.
 */

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

/* Message logging helpers with driver-specific prefix string. */
#define DRIVER_LOG_DOMAIN "fs9922: "
#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)

static gboolean flags_valid(const struct fs9922_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_err("More than one multiplier detected in packet.");
		return FALSE;
	}

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

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

	/* Both Celsius and Fahrenheit set? */
	if (info->is_celsius && info->is_fahrenheit) {
		sr_err("Both Celsius and Fahrenheit flags detected in packet.");
		return FALSE;
	}

	return TRUE;
}

static int parse_value(const uint8_t *buf, float *result)
{
	int sign, intval;
	float floatval;

	/* Byte 0: Sign ('+' or '-') */
	if (buf[0] == '+') {
		sign = 1;
	} else if (buf[0] == '-') {
		sign = -1;
	} else {
		sr_err("Invalid sign byte: 0x%02x.", buf[0]);
		return SR_ERR;
	}

	/*
	 * Bytes 1-4: Value (4 decimal digits)
	 *
	 * Over limit: "0.L" on the display, "?0:?" as protocol "digits".
	 */
	if (buf[1] == '?' && buf[2] == '0' && buf[3] == ':' && buf[4] == '?') {
		sr_spew("Over limit.");
		*result = INFINITY;
		return SR_OK;
	} else if (!isdigit(buf[1]) || !isdigit(buf[2]) ||
		   !isdigit(buf[3]) || !isdigit(buf[4])) {
		sr_err("Value contained invalid digits: %02x %02x %02x %02x ("
		       "%c %c %c %c).", buf[1], buf[2], buf[3], buf[4]);
		return SR_ERR;
	}
	intval = 0;
	intval += (buf[1] - '0') * 1000;
	intval += (buf[2] - '0') * 100;
	intval += (buf[3] - '0') * 10;
	intval += (buf[4] - '0') * 1;

	floatval = (float)intval;

	/* Byte 5: Always ' ' (space, 0x20) */

	/*
	 * Byte 6: Decimal point position ('0', '1', '2', or '4')
	 *
	 * Note: The Fortune Semiconductor FS9922-DMM3/4 datasheets both have
	 * an error/typo here. They claim that the values '0'/'1'/'2'/'3' are
	 * used, but '0'/'1'/'2'/'4' is actually correct.
	 */
	if (buf[6] != '0' && buf[6] != '1' && buf[6] != '2' && buf[6] != '4') {
		sr_err("Invalid decimal point value: 0x%02x.", buf[6]);
		return SR_ERR;
	}
	if (buf[6] == '0')
		floatval /= 1;
	else if (buf[6] == '1')
		floatval /= 1000;
	else if (buf[6] == '2')
		floatval /= 100;
	else if (buf[6] == '4')
		floatval /= 10;

	/* 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 fs9922_info *info)
{
	/* Z1/Z2/Z3/Z4 are bits for user-defined LCD symbols (on/off). */

	/* Byte 7 */
	/* Bit 7: Always 0 */
	/* Bit 6: Always 0 */
	info->is_auto       = (buf[7] & (1 << 5)) != 0;
	info->is_dc         = (buf[7] & (1 << 4)) != 0;
	info->is_ac         = (buf[7] & (1 << 3)) != 0;
	info->is_rel        = (buf[7] & (1 << 2)) != 0;
	info->is_hold       = (buf[7] & (1 << 1)) != 0;
	info->is_bpn        = (buf[7] & (1 << 0)) != 0; /* Bargraph shown */

	/* Byte 8 */
	info->is_z1         = (buf[8] & (1 << 7)) != 0; /* User symbol 1 */
	info->is_z2         = (buf[8] & (1 << 6)) != 0; /* User symbol 2 */
	info->is_max        = (buf[8] & (1 << 5)) != 0;
	info->is_min        = (buf[8] & (1 << 4)) != 0;
	info->is_apo        = (buf[8] & (1 << 3)) != 0; /* Auto-poweroff on */
	info->is_bat        = (buf[8] & (1 << 2)) != 0; /* Battery low */
	info->is_nano       = (buf[8] & (1 << 1)) != 0;
	info->is_z3         = (buf[8] & (1 << 0)) != 0; /* User symbol 3 */

	/* Byte 9 */
	info->is_micro      = (buf[9] & (1 << 7)) != 0;
	info->is_milli      = (buf[9] & (1 << 6)) != 0;
	info->is_kilo       = (buf[9] & (1 << 5)) != 0;
	info->is_mega       = (buf[9] & (1 << 4)) != 0;
	info->is_beep       = (buf[9] & (1 << 3)) != 0;
	info->is_diode      = (buf[9] & (1 << 2)) != 0;
	info->is_percent    = (buf[9] & (1 << 1)) != 0;
	info->is_z4         = (buf[8] & (1 << 0)) != 0; /* User symbol 4 */

	/* Byte 10 */
	info->is_volt       = (buf[10] & (1 << 7)) != 0;
	info->is_ampere     = (buf[10] & (1 << 6)) != 0;
	info->is_ohm        = (buf[10] & (1 << 5)) != 0;
	info->is_hfe        = (buf[10] & (1 << 4)) != 0;
	info->is_hertz      = (buf[10] & (1 << 3)) != 0;
	info->is_farad      = (buf[10] & (1 << 2)) != 0;
	info->is_celsius    = (buf[10] & (1 << 1)) != 0; /* Only FS9922-DMM4 */
	info->is_fahrenheit = (buf[10] & (1 << 0)) != 0; /* Only FS9922-DMM4 */

	/*
	 * Byte 11: Bar graph
	 *
	 * Bit 7 contains the sign of the bargraph number (if the bit is set,
	 * the number is negative), bits 6..0 contain the actual number.
	 * Valid range: 0-40 (FS9922-DMM3), 0-60 (FS9922-DMM4).
	 *
	 * Upon "over limit" the bargraph value is 1 count above the highest
	 * valid number (i.e. 41 or 61, depending on chip).
	 */
	if (info->is_bpn) {
		info->bargraph_sign = ((buf[11] & (1 << 7)) != 0) ? -1 : 1;
		info->bargraph_value = (buf[11] & 0x7f);
		info->bargraph_value *= info->bargraph_sign;
	}

	/* Byte 12: Always '\r' (carriage return, 0x0d, 13) */

	/* Byte 13: Always '\n' (newline, 0x0a, 10) */
}

static void handle_flags(struct sr_datafeed_analog *analog, float *floatval,
			 const struct fs9922_info *info)
{
	/* Factors */
	if (info->is_nano)
		*floatval /= 1000000000;
	if (info->is_micro)
		*floatval /= 1000000;
	if (info->is_milli)
		*floatval /= 1000;
	if (info->is_kilo)
		*floatval *= 1000;
	if (info->is_mega)
		*floatval *= 1000000;

	/* Measurement modes */
	if (info->is_volt) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
	}
	if (info->is_ampere) {
		analog->mq = SR_MQ_CURRENT;
		analog->unit = SR_UNIT_AMPERE;
	}
	if (info->is_ohm) {
		analog->mq = SR_MQ_RESISTANCE;
		analog->unit = SR_UNIT_OHM;
	}
	if (info->is_hfe) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_UNITLESS;
	}
	if (info->is_hertz) {
		analog->mq = SR_MQ_FREQUENCY;
		analog->unit = SR_UNIT_HERTZ;
	}
	if (info->is_farad) {
		analog->mq = SR_MQ_CAPACITANCE;
		analog->unit = SR_UNIT_FARAD;
	}
	if (info->is_celsius) {
		analog->mq = SR_MQ_TEMPERATURE;
		analog->unit = SR_UNIT_CELSIUS;
	}
	if (info->is_fahrenheit) {
		analog->mq = SR_MQ_TEMPERATURE;
		analog->unit = SR_UNIT_FAHRENHEIT;
	}
	if (info->is_beep) {
		analog->mq = SR_MQ_CONTINUITY;
		analog->unit = SR_UNIT_BOOLEAN;
		*floatval = (*floatval < 0.0) ? 0.0 : 1.0;
	}
	if (info->is_diode) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
	}
	if (info->is_percent) {
		analog->mq = SR_MQ_DUTY_CYCLE;
		analog->unit = SR_UNIT_PERCENTAGE;
	}

	/* Measurement related flags */
	if (info->is_ac)
		analog->mqflags |= SR_MQFLAG_AC;
	if (info->is_dc)
		analog->mqflags |= SR_MQFLAG_DC;
	if (info->is_auto)
		analog->mqflags |= SR_MQFLAG_AUTORANGE;
	if (info->is_hold)
		analog->mqflags |= SR_MQFLAG_HOLD;
	if (info->is_max)
		analog->mqflags |= SR_MQFLAG_MAX;
	if (info->is_min)
		analog->mqflags |= SR_MQFLAG_MIN;
	if (info->is_rel)
		analog->mqflags |= SR_MQFLAG_RELATIVE;

	/* Other flags */
	if (info->is_apo)
		sr_spew("Automatic power-off function is active.");
	if (info->is_bat)
		sr_spew("Battery is low.");
	if (info->is_z1)
		sr_spew("User-defined LCD symbol 1 is active.");
	if (info->is_z2)
		sr_spew("User-defined LCD symbol 2 is active.");
	if (info->is_z3)
		sr_spew("User-defined LCD symbol 3 is active.");
	if (info->is_z4)
		sr_spew("User-defined LCD symbol 4 is active.");
	if (info->is_bpn)
		sr_spew("The bargraph value is %d.", info->bargraph_value);
	else
		sr_spew("The bargraph is not active.");

}

SR_PRIV gboolean sr_fs9922_packet_valid(const uint8_t *buf)
{
	struct fs9922_info info;

	/* Byte 0: Sign (must be '+' or '-') */
	if (buf[0] != '+' && buf[0] != '-')
		return FALSE;

	/* Byte 12: Always '\r' (carriage return, 0x0d, 13) */
	/* Byte 13: Always '\n' (newline, 0x0a, 10) */
	if (buf[12] != '\r' || buf[13] != '\n')
		return FALSE;

	parse_flags(buf, &info);

	return flags_valid(&info);
}

/**
 * Parse a protocol packet.
 *
 * @param buf Buffer containing the 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 fs9922_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_fs9922_parse(const uint8_t *buf, float *floatval,
			    struct sr_datafeed_analog *analog, void *info)
{
	int ret;
	struct fs9922_info *info_local;

	info_local = (struct fs9922_info *)info;

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

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

	return SR_OK;
}
Commit	Line	Data
79081ec8	1	/*
50985c20	2	* This file is part of the libsigrok project.
79081ec8 UH	3	*
	4	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	/*
	22	* Fortune Semiconductor FS9922-DMM3/FS9922-DMM4 protocol parser.
	23	*/
	24
	25	#include <string.h>
	26	#include <ctype.h>
	27	#include <math.h>
	28	#include <glib.h>
	29	#include "libsigrok.h"
	30	#include "libsigrok-internal.h"
	31
	32	/* Message logging helpers with driver-specific prefix string. */
	33	#define DRIVER_LOG_DOMAIN "fs9922: "
	34	#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
	35	#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
	36	#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
	37	#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
	38	#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
	39	#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
	40
913abe83 UH	41	static gboolean flags_valid(const struct fs9922_info *info)
	42	{
	43	int count;
	44
	45	/* Does the packet have more than one multiplier? */
	46	count = 0;
	47	count += (info->is_nano) ? 1 : 0;
	48	count += (info->is_micro) ? 1 : 0;
	49	count += (info->is_milli) ? 1 : 0;
	50	count += (info->is_kilo) ? 1 : 0;
	51	count += (info->is_mega) ? 1 : 0;
	52	if (count > 1) {
	53	sr_err("More than one multiplier detected in packet.");
	54	return FALSE;
	55	}
	56
	57	/* Does the packet "measure" more than one type of value? */
	58	count = 0;
	59	count += (info->is_diode) ? 1 : 0;
	60	count += (info->is_percent) ? 1 : 0;
	61	count += (info->is_volt) ? 1 : 0;
	62	count += (info->is_ampere) ? 1 : 0;
	63	count += (info->is_ohm) ? 1 : 0;
	64	count += (info->is_hfe) ? 1 : 0;
	65	count += (info->is_hertz) ? 1 : 0;
	66	count += (info->is_farad) ? 1 : 0;
	67	count += (info->is_celsius) ? 1 : 0;
	68	count += (info->is_fahrenheit) ? 1 : 0;
	69	if (count > 1) {
	70	sr_err("More than one measurement type detected in packet.");
	71	return FALSE;
	72	}
	73
	74	/* Both AC and DC set? */
	75	if (info->is_ac && info->is_dc) {
	76	sr_err("Both AC and DC flags detected in packet.");
	77	return FALSE;
	78	}
	79
	80	/* Both Celsius and Fahrenheit set? */
	81	if (info->is_celsius && info->is_fahrenheit) {
	82	sr_err("Both Celsius and Fahrenheit flags detected in packet.");
	83	return FALSE;
	84	}
	85
	86	return TRUE;
	87	}
	88
79081ec8 UH	89	static int parse_value(const uint8_t buf, float result)
	90	{
	91	int sign, intval;
	92	float floatval;
	93
	94	/* Byte 0: Sign ('+' or '-') */
	95	if (buf[0] == '+') {
	96	sign = 1;
	97	} else if (buf[0] == '-') {
	98	sign = -1;
	99	} else {
	100	sr_err("Invalid sign byte: 0x%02x.", buf[0]);
	101	return SR_ERR;
	102	}
	103
	104	/*
	105	* Bytes 1-4: Value (4 decimal digits)
	106	*
	107	* Over limit: "0.L" on the display, "?0:?" as protocol "digits".
	108	*/
	109	if (buf[1] == '?' && buf[2] == '0' && buf[3] == ':' && buf[4] == '?') {
	110	sr_spew("Over limit.");
	111	*result = INFINITY;
	112	return SR_OK;
	113	} else if (!isdigit(buf[1]) \|\| !isdigit(buf[2]) \|\|
	114	!isdigit(buf[3]) \|\| !isdigit(buf[4])) {
	115	sr_err("Value contained invalid digits: %02x %02x %02x %02x ("
	116	"%c %c %c %c).", buf[1], buf[2], buf[3], buf[4]);
	117	return SR_ERR;
	118	}
	119	intval = 0;
	120	intval += (buf[1] - '0') * 1000;
	121	intval += (buf[2] - '0') * 100;
	122	intval += (buf[3] - '0') * 10;
	123	intval += (buf[4] - '0') * 1;
	124
	125	floatval = (float)intval;
	126
	127	/* Byte 5: Always ' ' (space, 0x20) */
	128
	129	/*
	130	* Byte 6: Decimal point position ('0', '1', '2', or '4')
	131	*
	132	* Note: The Fortune Semiconductor FS9922-DMM3/4 datasheets both have
	133	* an error/typo here. They claim that the values '0'/'1'/'2'/'3' are
	134	* used, but '0'/'1'/'2'/'4' is actually correct.
	135	*/
	136	if (buf[6] != '0' && buf[6] != '1' && buf[6] != '2' && buf[6] != '4') {
	137	sr_err("Invalid decimal point value: 0x%02x.", buf[6]);
	138	return SR_ERR;
	139	}
	140	if (buf[6] == '0')
	141	floatval /= 1;
	142	else if (buf[6] == '1')
	143	floatval /= 1000;
	144	else if (buf[6] == '2')
	145	floatval /= 100;
	146	else if (buf[6] == '4')
	147	floatval /= 10;
	148
	149	/* Apply sign. */
	150	floatval *= sign;
	151
	152	sr_spew("The display value is %f.", floatval);
153
154	*result = floatval;
155
156	return SR_OK;
157	}
158
913abe83	159	static void parse_flags(const uint8_t buf, struct fs9922_info info)
79081ec8	160	{
79081ec8 UH	161	/* Z1/Z2/Z3/Z4 are bits for user-defined LCD symbols (on/off). */
	162
	163	/* Byte 7 */
	164	/* Bit 7: Always 0 */
	165	/* Bit 6: Always 0 */
913abe83 UH	166	info->is_auto = (buf[7] & (1 << 5)) != 0;
	167	info->is_dc = (buf[7] & (1 << 4)) != 0;
	168	info->is_ac = (buf[7] & (1 << 3)) != 0;
	169	info->is_rel = (buf[7] & (1 << 2)) != 0;
	170	info->is_hold = (buf[7] & (1 << 1)) != 0;
	171	info->is_bpn = (buf[7] & (1 << 0)) != 0; /* Bargraph shown */
79081ec8 UH	172
79081ec8 UH	173	/* Byte 8 */
913abe83 UH	174	info->is_z1 = (buf[8] & (1 << 7)) != 0; /* User symbol 1 */
	175	info->is_z2 = (buf[8] & (1 << 6)) != 0; /* User symbol 2 */
	176	info->is_max = (buf[8] & (1 << 5)) != 0;
	177	info->is_min = (buf[8] & (1 << 4)) != 0;
	178	info->is_apo = (buf[8] & (1 << 3)) != 0; /* Auto-poweroff on */
	179	info->is_bat = (buf[8] & (1 << 2)) != 0; /* Battery low */
	180	info->is_nano = (buf[8] & (1 << 1)) != 0;
	181	info->is_z3 = (buf[8] & (1 << 0)) != 0; /* User symbol 3 */
79081ec8 UH	182
79081ec8 UH	183	/* Byte 9 */
913abe83 UH	184	info->is_micro = (buf[9] & (1 << 7)) != 0;
	185	info->is_milli = (buf[9] & (1 << 6)) != 0;
	186	info->is_kilo = (buf[9] & (1 << 5)) != 0;
	187	info->is_mega = (buf[9] & (1 << 4)) != 0;
	188	info->is_beep = (buf[9] & (1 << 3)) != 0;
	189	info->is_diode = (buf[9] & (1 << 2)) != 0;
	190	info->is_percent = (buf[9] & (1 << 1)) != 0;
	191	info->is_z4 = (buf[8] & (1 << 0)) != 0; /* User symbol 4 */
79081ec8 UH	192
79081ec8 UH	193	/* Byte 10 */
913abe83 UH	194	info->is_volt = (buf[10] & (1 << 7)) != 0;
	195	info->is_ampere = (buf[10] & (1 << 6)) != 0;
	196	info->is_ohm = (buf[10] & (1 << 5)) != 0;
	197	info->is_hfe = (buf[10] & (1 << 4)) != 0;
	198	info->is_hertz = (buf[10] & (1 << 3)) != 0;
	199	info->is_farad = (buf[10] & (1 << 2)) != 0;
	200	info->is_celsius = (buf[10] & (1 << 1)) != 0; /* Only FS9922-DMM4 */
	201	info->is_fahrenheit = (buf[10] & (1 << 0)) != 0; /* Only FS9922-DMM4 */
79081ec8 UH	202
	203	/*
	204	* Byte 11: Bar graph
	205	*
	206	* Bit 7 contains the sign of the bargraph number (if the bit is set,
	207	* the number is negative), bits 6..0 contain the actual number.
	208	* Valid range: 0-40 (FS9922-DMM3), 0-60 (FS9922-DMM4).
	209	*
	210	* Upon "over limit" the bargraph value is 1 count above the highest
	211	* valid number (i.e. 41 or 61, depending on chip).
	212	*/
913abe83 UH	213	if (info->is_bpn) {
	214	info->bargraph_sign = ((buf[11] & (1 << 7)) != 0) ? -1 : 1;
	215	info->bargraph_value = (buf[11] & 0x7f);
	216	info->bargraph_value *= info->bargraph_sign;
79081ec8 UH	217	}
	218
	219	/* Byte 12: Always '\r' (carriage return, 0x0d, 13) */
	220
	221	/* Byte 13: Always '\n' (newline, 0x0a, 10) */
913abe83	222	}
79081ec8	223
913abe83 UH	224	static void handle_flags(struct sr_datafeed_analog analog, float floatval,
	225	const struct fs9922_info *info)
	226	{
79081ec8	227	/* Factors */
913abe83	228	if (info->is_nano)
79081ec8	229	*floatval /= 1000000000;
913abe83	230	if (info->is_micro)
79081ec8	231	*floatval /= 1000000;
913abe83	232	if (info->is_milli)
79081ec8	233	*floatval /= 1000;
913abe83	234	if (info->is_kilo)
79081ec8	235	floatval = 1000;
913abe83	236	if (info->is_mega)
79081ec8 UH	237	floatval = 1000000;
	238
	239	/* Measurement modes */
913abe83	240	if (info->is_volt) {
79081ec8 UH	241	analog->mq = SR_MQ_VOLTAGE;
	242	analog->unit = SR_UNIT_VOLT;
	243	}
913abe83	244	if (info->is_ampere) {
79081ec8 UH	245	analog->mq = SR_MQ_CURRENT;
	246	analog->unit = SR_UNIT_AMPERE;
	247	}
913abe83	248	if (info->is_ohm) {
79081ec8 UH	249	analog->mq = SR_MQ_RESISTANCE;
	250	analog->unit = SR_UNIT_OHM;
	251	}
913abe83	252	if (info->is_hfe) {
79081ec8 UH	253	analog->mq = SR_MQ_GAIN;
	254	analog->unit = SR_UNIT_UNITLESS;
	255	}
913abe83	256	if (info->is_hertz) {
79081ec8 UH	257	analog->mq = SR_MQ_FREQUENCY;
	258	analog->unit = SR_UNIT_HERTZ;
	259	}
913abe83	260	if (info->is_farad) {
79081ec8 UH	261	analog->mq = SR_MQ_CAPACITANCE;
	262	analog->unit = SR_UNIT_FARAD;
	263	}
913abe83	264	if (info->is_celsius) {
79081ec8 UH	265	analog->mq = SR_MQ_TEMPERATURE;
	266	analog->unit = SR_UNIT_CELSIUS;
	267	}
913abe83	268	if (info->is_fahrenheit) {
79081ec8 UH	269	analog->mq = SR_MQ_TEMPERATURE;
	270	analog->unit = SR_UNIT_FAHRENHEIT;
	271	}
913abe83	272	if (info->is_beep) {
79081ec8 UH	273	analog->mq = SR_MQ_CONTINUITY;
	274	analog->unit = SR_UNIT_BOOLEAN;
	275	floatval = (floatval < 0.0) ? 0.0 : 1.0;
	276	}
913abe83	277	if (info->is_diode) {
79081ec8 UH	278	analog->mq = SR_MQ_VOLTAGE;
	279	analog->unit = SR_UNIT_VOLT;
	280	}
913abe83	281	if (info->is_percent) {
79081ec8 UH	282	analog->mq = SR_MQ_DUTY_CYCLE;
	283	analog->unit = SR_UNIT_PERCENTAGE;
	284	}
	285
	286	/* Measurement related flags */
913abe83	287	if (info->is_ac)
79081ec8	288	analog->mqflags \|= SR_MQFLAG_AC;
913abe83	289	if (info->is_dc)
79081ec8	290	analog->mqflags \|= SR_MQFLAG_DC;
913abe83	291	if (info->is_auto)
79081ec8	292	analog->mqflags \|= SR_MQFLAG_AUTORANGE;
913abe83	293	if (info->is_hold)
79081ec8	294	analog->mqflags \|= SR_MQFLAG_HOLD;
913abe83	295	if (info->is_max)
79081ec8	296	analog->mqflags \|= SR_MQFLAG_MAX;
913abe83	297	if (info->is_min)
79081ec8	298	analog->mqflags \|= SR_MQFLAG_MIN;
913abe83	299	if (info->is_rel)
79081ec8 UH	300	analog->mqflags \|= SR_MQFLAG_RELATIVE;
	301
	302	/* Other flags */
913abe83	303	if (info->is_apo)
79081ec8	304	sr_spew("Automatic power-off function is active.");
913abe83	305	if (info->is_bat)
79081ec8	306	sr_spew("Battery is low.");
913abe83	307	if (info->is_z1)
79081ec8	308	sr_spew("User-defined LCD symbol 1 is active.");
913abe83	309	if (info->is_z2)
79081ec8	310	sr_spew("User-defined LCD symbol 2 is active.");
913abe83	311	if (info->is_z3)
79081ec8	312	sr_spew("User-defined LCD symbol 3 is active.");
913abe83	313	if (info->is_z4)
79081ec8	314	sr_spew("User-defined LCD symbol 4 is active.");
913abe83 UH	315	if (info->is_bpn)
	316	sr_spew("The bargraph value is %d.", info->bargraph_value);
	317	else
	318	sr_spew("The bargraph is not active.");
79081ec8	319
913abe83 UH	320	}
	321
	322	SR_PRIV gboolean sr_fs9922_packet_valid(const uint8_t *buf)
	323	{
	324	struct fs9922_info info;
	325
	326	/* Byte 0: Sign (must be '+' or '-') */
	327	if (buf[0] != '+' && buf[0] != '-')
	328	return FALSE;
	329
	330	/* Byte 12: Always '\r' (carriage return, 0x0d, 13) */
	331	/* Byte 13: Always '\n' (newline, 0x0a, 10) */
	332	if (buf[12] != '\r' \|\| buf[13] != '\n')
	333	return FALSE;
	334
	335	parse_flags(buf, &info);
	336
	337	return flags_valid(&info);
79081ec8 UH	338	}
	339
	340	/**
913abe83	341	* Parse a protocol packet.
79081ec8	342	*
913abe83 UH	343	* @param buf Buffer containing the protocol packet. Must not be NULL.
	344	* @param floatval Pointer to a float variable. That variable will contain the
	345	* result value upon parsing success. Must not be NULL.
79081ec8 UH	346	* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
79081ec8 UH	347	* filled with data according to the protocol packet.
913abe83 UH	348	* Must not be NULL.
	349	* @param info Pointer to a struct fs9922_info. The struct will be filled
	350	* with data according to the protocol packet. Must not be NULL.
79081ec8 UH	351	*
	352	* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
	353	* 'analog' variable contents are undefined and should not be used.
	354	*/
913abe83 UH	355	SR_PRIV int sr_fs9922_parse(const uint8_t buf, float floatval,
913abe83 UH	356	struct sr_datafeed_analog analog, void info)
79081ec8 UH	357	{
79081ec8 UH	358	int ret;
913abe83 UH	359	struct fs9922_info *info_local;
	360
	361	info_local = (struct fs9922_info *)info;
79081ec8 UH	362
	363	if ((ret = parse_value(buf, floatval)) != SR_OK) {
	364	sr_err("Error parsing value: %d.", ret);
	365	return ret;
	366	}
	367
913abe83 UH	368	parse_flags(buf, info_local);
913abe83 UH	369	handle_flags(analog, floatval, info_local);
79081ec8 UH	370
	371	return SR_OK;
	372	}