[libsigrok.git] / src / hardware / asix-sigma / protocol.h

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2010-2012 Håvard Espeland <gus@ping.uio.no>,
 * Copyright (C) 2010 Martin Stensgård <mastensg@ping.uio.no>
 * Copyright (C) 2010 Carl Henrik Lunde <chlunde@ping.uio.no>
 *
 * 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/>.
 */

#ifndef LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H
#define LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H

#include <stdint.h>
#include <stdlib.h>
#include <glib.h>
#include <ftdi.h>
#include <string.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

#define LOG_PREFIX "asix-sigma"

/*
 * Triggers are not working in this implementation. Stop claiming
 * support for the feature which effectively is not available, until
 * the implementation got fixed. Yet keep the code in place and allow
 * developers to turn on this switch during development.
 */
#define ASIX_SIGMA_WITH_TRIGGER	0

/* Experimental support for OMEGA (scan only, operation is ENOIMPL). */
#define ASIX_WITH_OMEGA 0

#define USB_VENDOR_ASIX			0xa600
#define USB_PRODUCT_SIGMA		0xa000
#define USB_PRODUCT_OMEGA		0xa004

enum asix_device_type {
	ASIX_TYPE_NONE,
	ASIX_TYPE_SIGMA,
	ASIX_TYPE_OMEGA,
};

/*
 * FPGA commands are 8bits wide. The upper nibble is a command opcode,
 * the lower nibble can carry operand values. 8bit register addresses
 * and 8bit data values get communicated in two steps.
 */

/* Register access. */
#define REG_ADDR_LOW		(0x0 << 4)
#define REG_ADDR_HIGH		(0x1 << 4)
#define REG_DATA_LOW		(0x2 << 4)
#define REG_DATA_HIGH_WRITE	(0x3 << 4)
#define REG_READ_ADDR		(0x4 << 4)
#define REG_ADDR_ADJUST		(1 << 0) /* Auto adjust register address. */
#define REG_ADDR_DOWN		(1 << 1) /* 1 decrement, 0 increment. */
#define REG_ADDR_INC		(REG_ADDR_ADJUST)
#define REG_ADDR_DEC		(REG_ADDR_ADJUST | REG_ADDR_DOWN)

/* Sample memory access. */
#define REG_DRAM_WAIT_ACK	(0x5 << 4) /* Wait for completion. */
#define REG_DRAM_BLOCK		(0x6 << 4) /* DRAM to BRAM, plus bank select. */
#define REG_DRAM_BLOCK_BEGIN	(0x8 << 4) /* Read first BRAM bytes. */
#define REG_DRAM_BLOCK_DATA	(0xa << 4) /* Read full BRAM block. */
#define REG_DRAM_SEL_N		(0x1 << 4) /* Bank select, added to 6/8/a. */
#define REG_DRAM_SEL_BOOL(b)	((b) ? REG_DRAM_SEL_N : 0)

/*
 * Registers at a specific address can have different meanings depending
 * on whether data is read or written. This is why direction is part of
 * the programming language identifiers.
 *
 * The vendor documentation suggests that in addition to the first 16
 * register addresses which implement the logic analyzer's feature set,
 * there are 240 more registers in the 16 to 255 address range which
 * are available to applications and plugin features. Can libsigrok's
 * asix-sigma driver store configuration data there, to avoid expensive
 * operations (think: firmware re-load).
 */

enum sigma_write_register {
	WRITE_CLOCK_SELECT	= 0,
	WRITE_TRIGGER_SELECT	= 1,
	WRITE_TRIGGER_SELECT2	= 2,
	WRITE_MODE		= 3,
	WRITE_MEMROW		= 4,
	WRITE_POST_TRIGGER	= 5,
	WRITE_TRIGGER_OPTION	= 6,
	WRITE_PIN_VIEW		= 7,
	/* Unassigned register locations. */
	WRITE_TEST		= 15,
};

enum sigma_read_register {
	READ_ID			= 0,
	READ_TRIGGER_POS_LOW	= 1,
	READ_TRIGGER_POS_HIGH	= 2,
	READ_TRIGGER_POS_UP	= 3,
	READ_STOP_POS_LOW	= 4,
	READ_STOP_POS_HIGH	= 5,
	READ_STOP_POS_UP	= 6,
	READ_MODE		= 7,
	READ_PIN_CHANGE_LOW	= 8,
	READ_PIN_CHANGE_HIGH	= 9,
	READ_BLOCK_LAST_TS_LOW	= 10,
	READ_BLOCK_LAST_TS_HIGH	= 11,
	READ_BLOCK_TS_OVERRUN	= 12,
	READ_PIN_VIEW		= 13,
	/* Unassigned register location. */
	READ_TEST		= 15,
};

#define LEDSEL0			6
#define LEDSEL1			7


#define EVENTS_PER_CLUSTER	7

#define CHUNK_SIZE		1024

/* WRITE_MODE register fields. */
#define WMR_SDRAMWRITEEN	(1 << 0)
#define WMR_SDRAMREADEN		(1 << 1)
#define WMR_TRGRES		(1 << 2)
#define WMR_TRGEN		(1 << 3)
#define WMR_FORCESTOP		(1 << 4)
#define WMR_TRGSW		(1 << 5)
/* not used: bit position 6 */
#define WMR_SDRAMINIT		(1 << 7)

/* READ_MODE register fields. */
#define RMR_SDRAMWRITEEN	(1 << 0)
#define RMR_SDRAMREADEN		(1 << 1)
/* not used: bit position 2 */
#define RMR_TRGEN		(1 << 3)
#define RMR_ROUND		(1 << 4)
#define RMR_TRIGGERED		(1 << 5)
#define RMR_POSTTRIGGERED	(1 << 6)
/* not used: bit position 7 */

/*
 * Layout of the sample data DRAM, which will be downloaded to the PC:
 *
 * Sigma memory is organized in 32K rows. Each row contains 64 clusters.
 * Each cluster contains a timestamp (16bit) and 7 samples (16bits each).
 * Total memory size is 32K x 64 x 8 x 2 bytes == 32 MB (256 Mbit).
 *
 * Sample data is represented in 16bit quantities. The first sample in
 * the cluster corresponds to the cluster's timestamp. Each next sample
 * corresponds to the timestamp + 1, timestamp + 2, etc (the distance is
 * one sample period, according to the samplerate). In the absence of
 * pin level changes, no data is provided (RLE compression). A cluster
 * is enforced for each 64K ticks of the timestamp, to reliably handle
 * rollover and determination of the next timestamp of the next cluster.
 *
 * For samplerates of 100MHz, there is one 16 bit entity for each 20ns
 * period (50MHz rate). The 16 bit memory contains 2 samples of up to
 * 8 channels. Bits of multiple samples are interleaved. For samplerates
 * of 200MHz one 16bit entity contains 4 samples of up to 4 channels,
 * each 5ns apart.
 *
 * Memory addresses (sample count, trigger position) are kept in 24bit
 * entities. The upper 15 bit refer to the "row", the lower 9 bit refer
 * to the "event" within the row. Because there is one timestamp for
 * seven samples each, one memory row can hold up to 64x7 == 448 samples.
 */

/* One "DRAM cluster" contains a timestamp and 7 samples, 16b total. */
struct sigma_dram_cluster {
	uint8_t		timestamp_lo;
	uint8_t		timestamp_hi;
	struct {
		uint8_t	sample_hi;
		uint8_t	sample_lo;
	}		samples[7];
};

/* One "DRAM line" contains 64 "DRAM clusters", 1024b total. */
struct sigma_dram_line {
	struct sigma_dram_cluster	cluster[64];
};

struct clockselect_50 {
	uint8_t async;
	uint8_t fraction;
	uint16_t disabled_channels;
};

/* The effect of all these are still a bit unclear. */
struct triggerinout {
	uint8_t trgout_resistor_enable : 1;
	uint8_t trgout_resistor_pullup : 1;
	uint8_t reserved1 : 1;
	uint8_t trgout_bytrigger : 1;
	uint8_t trgout_byevent : 1;
	uint8_t trgout_bytriggerin : 1;
	uint8_t reserved2 : 2;

	/* Should be set same as the first two */
	uint8_t trgout_resistor_enable2 : 1;
	uint8_t trgout_resistor_pullup2 : 1;

	uint8_t reserved3 : 1;
	uint8_t trgout_long : 1;
	uint8_t trgout_pin : 1; /* Use 1k resistor. Pullup? */
	uint8_t trgin_negate : 1;
	uint8_t trgout_enable : 1;
	uint8_t trgin_enable : 1;
};

struct triggerlut {
	/* The actual LUTs. */
	uint16_t m0d[4], m1d[4], m2d[4];
	uint16_t m3, m3s, m4;

	/* Parameters should be sent as a single register write. */
	struct {
		uint8_t selc : 2;
		uint8_t selpresc : 6;

		uint8_t selinc : 2;
		uint8_t selres : 2;
		uint8_t sela : 2;
		uint8_t selb : 2;

		uint16_t cmpb;
		uint16_t cmpa;
	} params;
};

/* Trigger configuration */
struct sigma_trigger {
	/* Only two channels can be used in mask. */
	uint16_t risingmask;
	uint16_t fallingmask;

	/* Simple trigger support (<= 50 MHz). */
	uint16_t simplemask;
	uint16_t simplevalue;

	/* TODO: Advanced trigger support (boolean expressions). */
};

/* Events for trigger operation. */
enum triggerop {
	OP_LEVEL = 1,
	OP_NOT,
	OP_RISE,
	OP_FALL,
	OP_RISEFALL,
	OP_NOTRISE,
	OP_NOTFALL,
	OP_NOTRISEFALL,
};

/* Logical functions for trigger operation. */
enum triggerfunc {
	FUNC_AND = 1,
	FUNC_NAND,
	FUNC_OR,
	FUNC_NOR,
	FUNC_XOR,
	FUNC_NXOR,
};

struct sigma_state {
	enum {
		SIGMA_UNINITIALIZED = 0,
		SIGMA_IDLE,
		SIGMA_CAPTURE,
		SIGMA_STOPPING,
		SIGMA_DOWNLOAD,
	} state;
	uint16_t lastts;
	uint16_t lastsample;
};

struct dev_context {
	struct {
		uint16_t vid, pid;
		uint32_t serno;
		uint16_t prefix;
		enum asix_device_type type;
	} id;
	struct ftdi_context ftdic;
	uint64_t cur_samplerate;
	uint64_t limit_msec;
	uint64_t limit_samples;
	uint64_t sent_samples;
	uint64_t start_time;
	int cur_firmware;
	int num_channels;
	int cur_channels;
	int samples_per_event;
	uint64_t capture_ratio;
	struct sigma_trigger trigger;
	int use_triggers;
	struct sigma_state state;
};

extern SR_PRIV const uint64_t samplerates[];
extern SR_PRIV const size_t samplerates_count;

SR_PRIV int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
				 struct dev_context *devc);
SR_PRIV int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc);
SR_PRIV int sigma_write_trigger_lut(struct triggerlut *lut, struct dev_context *devc);
SR_PRIV uint64_t sigma_limit_samples_to_msec(const struct dev_context *devc,
					     uint64_t limit_samples);
SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate);
SR_PRIV int sigma_convert_trigger(const struct sr_dev_inst *sdi);
SR_PRIV int sigma_receive_data(int fd, int revents, void *cb_data);
SR_PRIV int sigma_build_basic_trigger(struct triggerlut *lut, struct dev_context *devc);

#endif
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2010-2012 Håvard Espeland <gus@ping.uio.no>,
	5	* Copyright (C) 2010 Martin Stensgård <mastensg@ping.uio.no>
	6	* Copyright (C) 2010 Carl Henrik Lunde <chlunde@ping.uio.no>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation, either version 3 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#ifndef LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H
	23	#define LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H
	24
	25	#include <stdint.h>
	26	#include <stdlib.h>
	27	#include <glib.h>
	28	#include <ftdi.h>
	29	#include <string.h>
	30	#include <libsigrok/libsigrok.h>
	31	#include "libsigrok-internal.h"
	32
	33	#define LOG_PREFIX "asix-sigma"
	34
	35	/*
	36	* Triggers are not working in this implementation. Stop claiming
	37	* support for the feature which effectively is not available, until
	38	* the implementation got fixed. Yet keep the code in place and allow
	39	* developers to turn on this switch during development.
	40	*/
	41	#define ASIX_SIGMA_WITH_TRIGGER 0
	42
	43	/* Experimental support for OMEGA (scan only, operation is ENOIMPL). */
	44	#define ASIX_WITH_OMEGA 0
	45
	46	#define USB_VENDOR_ASIX 0xa600
	47	#define USB_PRODUCT_SIGMA 0xa000
	48	#define USB_PRODUCT_OMEGA 0xa004
	49
	50	enum asix_device_type {
	51	ASIX_TYPE_NONE,
	52	ASIX_TYPE_SIGMA,
	53	ASIX_TYPE_OMEGA,
	54	};
	55
	56	/*
	57	* FPGA commands are 8bits wide. The upper nibble is a command opcode,
	58	* the lower nibble can carry operand values. 8bit register addresses
	59	* and 8bit data values get communicated in two steps.
	60	*/
	61
	62	/* Register access. */
	63	#define REG_ADDR_LOW (0x0 << 4)
	64	#define REG_ADDR_HIGH (0x1 << 4)
	65	#define REG_DATA_LOW (0x2 << 4)
	66	#define REG_DATA_HIGH_WRITE (0x3 << 4)
	67	#define REG_READ_ADDR (0x4 << 4)
	68	#define REG_ADDR_ADJUST (1 << 0) /* Auto adjust register address. */
	69	#define REG_ADDR_DOWN (1 << 1) /* 1 decrement, 0 increment. */
	70	#define REG_ADDR_INC (REG_ADDR_ADJUST)
	71	#define REG_ADDR_DEC (REG_ADDR_ADJUST \| REG_ADDR_DOWN)
	72
	73	/* Sample memory access. */
	74	#define REG_DRAM_WAIT_ACK (0x5 << 4) /* Wait for completion. */
	75	#define REG_DRAM_BLOCK (0x6 << 4) /* DRAM to BRAM, plus bank select. */
	76	#define REG_DRAM_BLOCK_BEGIN (0x8 << 4) /* Read first BRAM bytes. */
	77	#define REG_DRAM_BLOCK_DATA (0xa << 4) /* Read full BRAM block. */
	78	#define REG_DRAM_SEL_N (0x1 << 4) /* Bank select, added to 6/8/a. */
	79	#define REG_DRAM_SEL_BOOL(b) ((b) ? REG_DRAM_SEL_N : 0)
	80
	81	/*
	82	* Registers at a specific address can have different meanings depending
	83	* on whether data is read or written. This is why direction is part of
	84	* the programming language identifiers.
	85	*
	86	* The vendor documentation suggests that in addition to the first 16
	87	* register addresses which implement the logic analyzer's feature set,
	88	* there are 240 more registers in the 16 to 255 address range which
	89	* are available to applications and plugin features. Can libsigrok's
	90	* asix-sigma driver store configuration data there, to avoid expensive
	91	* operations (think: firmware re-load).
	92	*/
	93
	94	enum sigma_write_register {
	95	WRITE_CLOCK_SELECT = 0,
	96	WRITE_TRIGGER_SELECT = 1,
	97	WRITE_TRIGGER_SELECT2 = 2,
	98	WRITE_MODE = 3,
	99	WRITE_MEMROW = 4,
	100	WRITE_POST_TRIGGER = 5,
	101	WRITE_TRIGGER_OPTION = 6,
	102	WRITE_PIN_VIEW = 7,
	103	/* Unassigned register locations. */
	104	WRITE_TEST = 15,
	105	};
	106
	107	enum sigma_read_register {
	108	READ_ID = 0,
	109	READ_TRIGGER_POS_LOW = 1,
	110	READ_TRIGGER_POS_HIGH = 2,
	111	READ_TRIGGER_POS_UP = 3,
	112	READ_STOP_POS_LOW = 4,
	113	READ_STOP_POS_HIGH = 5,
	114	READ_STOP_POS_UP = 6,
	115	READ_MODE = 7,
	116	READ_PIN_CHANGE_LOW = 8,
	117	READ_PIN_CHANGE_HIGH = 9,
	118	READ_BLOCK_LAST_TS_LOW = 10,
	119	READ_BLOCK_LAST_TS_HIGH = 11,
	120	READ_BLOCK_TS_OVERRUN = 12,
	121	READ_PIN_VIEW = 13,
	122	/* Unassigned register location. */
	123	READ_TEST = 15,
	124	};
	125
	126	#define LEDSEL0 6
	127	#define LEDSEL1 7
	128
	129
	130	#define EVENTS_PER_CLUSTER 7
	131
	132	#define CHUNK_SIZE 1024
	133
	134	/* WRITE_MODE register fields. */
	135	#define WMR_SDRAMWRITEEN (1 << 0)
	136	#define WMR_SDRAMREADEN (1 << 1)
	137	#define WMR_TRGRES (1 << 2)
	138	#define WMR_TRGEN (1 << 3)
	139	#define WMR_FORCESTOP (1 << 4)
	140	#define WMR_TRGSW (1 << 5)
	141	/* not used: bit position 6 */
	142	#define WMR_SDRAMINIT (1 << 7)
	143
	144	/* READ_MODE register fields. */
	145	#define RMR_SDRAMWRITEEN (1 << 0)
	146	#define RMR_SDRAMREADEN (1 << 1)
	147	/* not used: bit position 2 */
	148	#define RMR_TRGEN (1 << 3)
	149	#define RMR_ROUND (1 << 4)
	150	#define RMR_TRIGGERED (1 << 5)
	151	#define RMR_POSTTRIGGERED (1 << 6)
	152	/* not used: bit position 7 */
	153
	154	/*
	155	* Layout of the sample data DRAM, which will be downloaded to the PC:
	156	*
	157	* Sigma memory is organized in 32K rows. Each row contains 64 clusters.
	158	* Each cluster contains a timestamp (16bit) and 7 samples (16bits each).
	159	* Total memory size is 32K x 64 x 8 x 2 bytes == 32 MB (256 Mbit).
	160	*
	161	* Sample data is represented in 16bit quantities. The first sample in
	162	* the cluster corresponds to the cluster's timestamp. Each next sample
	163	* corresponds to the timestamp + 1, timestamp + 2, etc (the distance is
	164	* one sample period, according to the samplerate). In the absence of
	165	* pin level changes, no data is provided (RLE compression). A cluster
	166	* is enforced for each 64K ticks of the timestamp, to reliably handle
	167	* rollover and determination of the next timestamp of the next cluster.
	168	*
	169	* For samplerates of 100MHz, there is one 16 bit entity for each 20ns
	170	* period (50MHz rate). The 16 bit memory contains 2 samples of up to
	171	* 8 channels. Bits of multiple samples are interleaved. For samplerates
	172	* of 200MHz one 16bit entity contains 4 samples of up to 4 channels,
	173	* each 5ns apart.
	174	*
	175	* Memory addresses (sample count, trigger position) are kept in 24bit
	176	* entities. The upper 15 bit refer to the "row", the lower 9 bit refer
	177	* to the "event" within the row. Because there is one timestamp for
	178	* seven samples each, one memory row can hold up to 64x7 == 448 samples.
	179	*/
	180
	181	/* One "DRAM cluster" contains a timestamp and 7 samples, 16b total. */
	182	struct sigma_dram_cluster {
	183	uint8_t timestamp_lo;
	184	uint8_t timestamp_hi;
	185	struct {
	186	uint8_t sample_hi;
	187	uint8_t sample_lo;
	188	} samples[7];
	189	};
	190
	191	/* One "DRAM line" contains 64 "DRAM clusters", 1024b total. */
	192	struct sigma_dram_line {
	193	struct sigma_dram_cluster cluster[64];
	194	};
	195
	196	struct clockselect_50 {
	197	uint8_t async;
	198	uint8_t fraction;
	199	uint16_t disabled_channels;
	200	};
	201
	202	/* The effect of all these are still a bit unclear. */
	203	struct triggerinout {
	204	uint8_t trgout_resistor_enable : 1;
	205	uint8_t trgout_resistor_pullup : 1;
	206	uint8_t reserved1 : 1;
	207	uint8_t trgout_bytrigger : 1;
	208	uint8_t trgout_byevent : 1;
	209	uint8_t trgout_bytriggerin : 1;
	210	uint8_t reserved2 : 2;
	211
	212	/* Should be set same as the first two */
	213	uint8_t trgout_resistor_enable2 : 1;
	214	uint8_t trgout_resistor_pullup2 : 1;
	215
	216	uint8_t reserved3 : 1;
	217	uint8_t trgout_long : 1;
	218	uint8_t trgout_pin : 1; /* Use 1k resistor. Pullup? */
	219	uint8_t trgin_negate : 1;
	220	uint8_t trgout_enable : 1;
	221	uint8_t trgin_enable : 1;
	222	};
	223
	224	struct triggerlut {
	225	/* The actual LUTs. */
	226	uint16_t m0d[4], m1d[4], m2d[4];
	227	uint16_t m3, m3s, m4;
	228
	229	/* Parameters should be sent as a single register write. */
	230	struct {
	231	uint8_t selc : 2;
	232	uint8_t selpresc : 6;
	233
	234	uint8_t selinc : 2;
	235	uint8_t selres : 2;
	236	uint8_t sela : 2;
	237	uint8_t selb : 2;
	238
	239	uint16_t cmpb;
	240	uint16_t cmpa;
	241	} params;
	242	};
	243
	244	/* Trigger configuration */
	245	struct sigma_trigger {
	246	/* Only two channels can be used in mask. */
	247	uint16_t risingmask;
	248	uint16_t fallingmask;
	249
	250	/* Simple trigger support (<= 50 MHz). */
	251	uint16_t simplemask;
	252	uint16_t simplevalue;
	253
	254	/* TODO: Advanced trigger support (boolean expressions). */
	255	};
	256
	257	/* Events for trigger operation. */
	258	enum triggerop {
	259	OP_LEVEL = 1,
	260	OP_NOT,
	261	OP_RISE,
	262	OP_FALL,
	263	OP_RISEFALL,
	264	OP_NOTRISE,
	265	OP_NOTFALL,
	266	OP_NOTRISEFALL,
	267	};
	268
	269	/* Logical functions for trigger operation. */
	270	enum triggerfunc {
	271	FUNC_AND = 1,
	272	FUNC_NAND,
	273	FUNC_OR,
	274	FUNC_NOR,
	275	FUNC_XOR,
	276	FUNC_NXOR,
	277	};
	278
	279	struct sigma_state {
	280	enum {
	281	SIGMA_UNINITIALIZED = 0,
	282	SIGMA_IDLE,
	283	SIGMA_CAPTURE,
	284	SIGMA_STOPPING,
	285	SIGMA_DOWNLOAD,
	286	} state;
	287	uint16_t lastts;
	288	uint16_t lastsample;
	289	};
	290
	291	struct dev_context {
	292	struct {
	293	uint16_t vid, pid;
	294	uint32_t serno;
	295	uint16_t prefix;
	296	enum asix_device_type type;
	297	} id;
	298	struct ftdi_context ftdic;
	299	uint64_t cur_samplerate;
	300	uint64_t limit_msec;
	301	uint64_t limit_samples;
	302	uint64_t sent_samples;
	303	uint64_t start_time;
	304	int cur_firmware;
	305	int num_channels;
	306	int cur_channels;
	307	int samples_per_event;
	308	uint64_t capture_ratio;
	309	struct sigma_trigger trigger;
	310	int use_triggers;
	311	struct sigma_state state;
	312	};
	313
	314	extern SR_PRIV const uint64_t samplerates[];
	315	extern SR_PRIV const size_t samplerates_count;
	316
	317	SR_PRIV int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
	318	struct dev_context *devc);
	319	SR_PRIV int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc);
	320	SR_PRIV int sigma_write_trigger_lut(struct triggerlut lut, struct dev_context devc);
	321	SR_PRIV uint64_t sigma_limit_samples_to_msec(const struct dev_context *devc,
	322	uint64_t limit_samples);
	323	SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate);
	324	SR_PRIV int sigma_convert_trigger(const struct sr_dev_inst *sdi);
	325	SR_PRIV int sigma_receive_data(int fd, int revents, void *cb_data);
	326	SR_PRIV int sigma_build_basic_trigger(struct triggerlut lut, struct dev_context devc);
	327
	328	#endif