[libsigrok.git] / hardware / demo / demo.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.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
 */

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sigrok.h>
#include <sigrok-internal.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "config.h"

/* TODO: Number of probes should be configurable. */
#define NUM_PROBES             8

#define DEMONAME               "Demo device"

/* The size of chunks to send through the session bus. */
/* TODO: Should be configurable. */
#define BUFSIZE                4096

/* Supported patterns which we can generate */
enum {
	/**
	 * Pattern which spells "sigrok" using '0's (with '1's as "background")
	 * when displayed using the 'bits' output format.
	 */
	PATTERN_SIGROK,

	/** Pattern which consists of (pseudo-)random values on all probes. */
	PATTERN_RANDOM,

	/**
	 * Pattern which consists of incrementing numbers.
	 * TODO: Better description.
	 */
	PATTERN_INC,

	/** Pattern where all probes have a low logic state. */
	PATTERN_ALL_LOW,

	/** Pattern where all probes have a high logic state. */
	PATTERN_ALL_HIGH,
};

/* FIXME: Should not be global. */
GIOChannel *channels[2];

struct databag {
	int pipe_fds[2];
	uint8_t sample_generator;
	uint8_t thread_running;
	uint64_t samples_counter;
	int device_index;
	gpointer session_device_id;
	GTimer *timer;
};

static int capabilities[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_PATTERN_MODE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
};

static struct sr_samplerates samplerates = {
	SR_HZ(1),
	SR_GHZ(1),
	SR_HZ(1),
	NULL,
};

static const char *pattern_strings[] = {
	"sigrok",
	"random",
	"incremental",
	"all-low",
	"all-high",
	NULL,
};

static uint8_t pattern_sigrok[] = {
	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
static GSList *device_instances = NULL;
static uint64_t cur_samplerate = SR_KHZ(200);
static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
static int default_pattern = PATTERN_SIGROK;
static GThread *my_thread;
static int thread_running;

static void hw_stop_acquisition(int device_index, gpointer session_device_id);

static int hw_init(const char *deviceinfo)
{
	struct sr_device_instance *sdi;

	/* Avoid compiler warnings. */
	deviceinfo = deviceinfo;

	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	if (!sdi) {
		sr_err("demo: %s: sr_device_instance_new failed", __func__);
		return 0;
	}

	device_instances = g_slist_append(device_instances, sdi);

	return 1;
}

static int hw_opendev(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_closedev(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static void hw_cleanup(void)
{
	/* Nothing needed so far. */
}

static void *hw_get_device_info(int device_index, int device_info_id)
{
	struct sr_device_instance *sdi;
	void *info = NULL;

	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
		sr_err("demo: %s: sdi was NULL", __func__);
		return NULL;
	}

	switch (device_info_id) {
	case SR_DI_INSTANCE:
		info = sdi;
		break;
	case SR_DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case SR_DI_SAMPLERATES:
		info = &samplerates;
		break;
	case SR_DI_CUR_SAMPLERATE:
		info = &cur_samplerate;
		break;
	case SR_DI_PATTERNMODES:
		info = &pattern_strings;
		break;
	}

	return info;
}

static int hw_get_status(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	return SR_ST_ACTIVE;
}

static int *hw_get_capabilities(void)
{
	return capabilities;
}

static int hw_set_configuration(int device_index, int capability, void *value)
{
	int ret;
	char *stropt;

	/* Avoid compiler warnings. */
	device_index = device_index;

	if (capability == SR_HWCAP_PROBECONFIG) {
		/* Nothing to do, but must be supported */
		ret = SR_OK;
	} else if (capability == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(uint64_t *)value;
		sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
		limit_samples = *(uint64_t *)value;
		sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
		       limit_samples);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
		limit_msec = *(uint64_t *)value;
		sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
		       limit_msec);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_PATTERN_MODE) {
		stropt = value;
		ret = SR_OK;
		if (!strcmp(stropt, "sigrok")) {
			default_pattern = PATTERN_SIGROK;
		} else if (!strcmp(stropt, "random")) {
			default_pattern = PATTERN_RANDOM;
		} else if (!strcmp(stropt, "incremental")) {
			default_pattern = PATTERN_INC;
		} else if (!strcmp(stropt, "all-low")) {
			default_pattern = PATTERN_ALL_LOW;
		} else if (!strcmp(stropt, "all-high")) {
			default_pattern = PATTERN_ALL_HIGH;
		} else {
			ret = SR_ERR;
		}
		sr_dbg("demo: %s: setting pattern to %d", __func__,
		       default_pattern);
	} else {
		ret = SR_ERR;
	}

	return ret;
}

static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
	static uint64_t p = 0;
	struct databag *mydata = data;
	uint64_t i;

	/* TODO: Needed? */
	memset(buf, 0, size);

	switch (mydata->sample_generator) {
	case PATTERN_SIGROK: /* sigrok pattern */
		for (i = 0; i < size; i++) {
			*(buf + i) = ~(pattern_sigrok[p] >> 1);
			if (++p == 64)
				p = 0;
		}
		break;
	case PATTERN_RANDOM: /* Random */
		for (i = 0; i < size; i++)
			*(buf + i) = (uint8_t)(rand() & 0xff);
		break;
	case PATTERN_INC: /* Simple increment */
		for (i = 0; i < size; i++)
			*(buf + i) = i;
		break;
	case PATTERN_ALL_LOW: /* All probes are low */
		memset(buf, 0x00, size);
		break;
	case PATTERN_ALL_HIGH: /* All probes are high */
		memset(buf, 0xff, size);
		break;
	default:
		/* TODO: Error handling. */
		break;
	}
}

/* Thread function */
static void thread_func(void *data)
{
	struct databag *mydata = data;
	uint8_t buf[BUFSIZE];
	uint64_t nb_to_send = 0;
	int bytes_written;
	double time_cur, time_last, time_diff;

	time_last = g_timer_elapsed(mydata->timer, NULL);

	while (thread_running) {
		/* Rate control */
		time_cur = g_timer_elapsed(mydata->timer, NULL);

		time_diff = time_cur - time_last;
		time_last = time_cur;

		nb_to_send = cur_samplerate * time_diff;

		if (limit_samples) {
			nb_to_send = MIN(nb_to_send,
				      limit_samples - mydata->samples_counter);
		}

		/* Make sure we don't overflow. */
		nb_to_send = MIN(nb_to_send, BUFSIZE);

		if (nb_to_send) {
			samples_generator(buf, nb_to_send, data);
			mydata->samples_counter += nb_to_send;

			g_io_channel_write_chars(channels[1], (gchar *)&buf,
				nb_to_send, (gsize *)&bytes_written, NULL);
		}

		/* Check if we're done. */
		if ((limit_msec && time_cur * 1000 > limit_msec) ||
		    (limit_samples && mydata->samples_counter >= limit_samples))
		{
			close(mydata->pipe_fds[1]);
			thread_running = 0;
		}

		g_usleep(10);
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *user_data)
{
	struct sr_datafeed_packet packet;
	char c[BUFSIZE];
	gsize z;

	/* Avoid compiler warnings. */
	fd = fd;
	revents = revents;

	do {
		g_io_channel_read_chars(channels[0],
				        (gchar *)&c, BUFSIZE, &z, NULL);

		if (z > 0) {
			packet.type = SR_DF_LOGIC;
			packet.length = z;
			packet.unitsize = 1;
			packet.payload = c;
			sr_session_bus(user_data, &packet);
		}
	} while (z > 0);

	if (!thread_running && z <= 0) {
		/* Make sure we don't receive more packets. */
		g_io_channel_close(channels[0]);

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_bus(user_data, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_start_acquisition(int device_index, gpointer session_device_id)
{
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_header *header;
	struct databag *mydata;

	/* TODO: 'mydata' is never g_free()'d? */
	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
		sr_err("demo: %s: mydata malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	mydata->sample_generator = default_pattern;
	mydata->session_device_id = session_device_id;
	mydata->device_index = device_index;
	mydata->samples_counter = 0;

	if (pipe(mydata->pipe_fds)) {
		/* TODO: Better error message. */
		sr_err("demo: %s: pipe() failed", __func__);
		return SR_ERR;
	}

	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);

	/* Set channel encoding to binary (default is UTF-8). */
	g_io_channel_set_encoding(channels[0], NULL, NULL);
	g_io_channel_set_encoding(channels[1], NULL, NULL);

	/* Make channels to unbuffered. */
	g_io_channel_set_buffered(channels[0], FALSE);
	g_io_channel_set_buffered(channels[1], FALSE);

	sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40,
		      receive_data, session_device_id);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* This must to be done between g_thread_init() & g_thread_create(). */
	mydata->timer = g_timer_new();
	thread_running = 1;
	my_thread =
	    g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	if (!my_thread) {
		sr_err("demo: %s: g_thread_create failed", __func__);
		return SR_ERR; /* TODO */
	}

	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
		sr_err("demo: %s: packet malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
		sr_err("demo: %s: header malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	packet->type = SR_DF_HEADER;
	packet->length = sizeof(struct sr_datafeed_header);
	packet->payload = (unsigned char *)header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->protocol_id = SR_PROTO_RAW;
	header->num_logic_probes = NUM_PROBES;
	header->num_analog_probes = 0;
	sr_session_bus(session_device_id, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

static void hw_stop_acquisition(int device_index, gpointer session_device_id)
{
	/* Avoid compiler warnings. */
	device_index = device_index;
	session_device_id = session_device_id;

	/* Stop generate thread. */
	thread_running = 0;
}

struct sr_device_plugin demo_plugin_info = {
	.name = "demo",
	.longname = "Demo driver and pattern generator",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.opendev = hw_opendev,
	.closedev = hw_closedev,
	.get_device_info = hw_get_device_info,
	.get_status = hw_get_status,
	.get_capabilities = hw_get_capabilities,
	.set_configuration = hw_set_configuration,
	.start_acquisition = hw_start_acquisition,
	.stop_acquisition = hw_stop_acquisition,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
	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	#include <stdlib.h>
	23	#include <unistd.h>
	24	#include <string.h>
	25	#include <sigrok.h>
	26	#include <sigrok-internal.h>
	27	#ifdef _WIN32
	28	#include <io.h>
	29	#include <fcntl.h>
	30	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	31	#endif
	32	#include "config.h"
	33
	34	/* TODO: Number of probes should be configurable. */
	35	#define NUM_PROBES 8
	36
	37	#define DEMONAME "Demo device"
	38
	39	/* The size of chunks to send through the session bus. */
	40	/* TODO: Should be configurable. */
	41	#define BUFSIZE 4096
	42
	43	/* Supported patterns which we can generate */
	44	enum {
	45	/**
	46	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	47	* when displayed using the 'bits' output format.
	48	*/
	49	PATTERN_SIGROK,
	50
	51	/** Pattern which consists of (pseudo-)random values on all probes. */
	52	PATTERN_RANDOM,
	53
	54	/**
	55	* Pattern which consists of incrementing numbers.
	56	* TODO: Better description.
	57	*/
	58	PATTERN_INC,
	59
	60	/** Pattern where all probes have a low logic state. */
	61	PATTERN_ALL_LOW,
	62
	63	/** Pattern where all probes have a high logic state. */
	64	PATTERN_ALL_HIGH,
	65	};
	66
	67	/* FIXME: Should not be global. */
	68	GIOChannel *channels[2];
	69
	70	struct databag {
	71	int pipe_fds[2];
	72	uint8_t sample_generator;
	73	uint8_t thread_running;
	74	uint64_t samples_counter;
	75	int device_index;
	76	gpointer session_device_id;
	77	GTimer *timer;
	78	};
	79
	80	static int capabilities[] = {
	81	SR_HWCAP_LOGIC_ANALYZER,
	82	SR_HWCAP_SAMPLERATE,
	83	SR_HWCAP_PATTERN_MODE,
	84	SR_HWCAP_LIMIT_SAMPLES,
	85	SR_HWCAP_LIMIT_MSEC,
	86	SR_HWCAP_CONTINUOUS,
	87	};
	88
	89	static struct sr_samplerates samplerates = {
	90	SR_HZ(1),
	91	SR_GHZ(1),
	92	SR_HZ(1),
	93	NULL,
	94	};
	95
	96	static const char *pattern_strings[] = {
	97	"sigrok",
	98	"random",
	99	"incremental",
	100	"all-low",
	101	"all-high",
	102	NULL,
	103	};
	104
	105	static uint8_t pattern_sigrok[] = {
	106	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	107	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	108	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	109	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	110	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	111	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	112	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	113	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	114	};
	115
	116	/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
	117	static GSList *device_instances = NULL;
	118	static uint64_t cur_samplerate = SR_KHZ(200);
	119	static uint64_t limit_samples = 0;
	120	static uint64_t limit_msec = 0;
	121	static int default_pattern = PATTERN_SIGROK;
	122	static GThread *my_thread;
	123	static int thread_running;
	124
	125	static void hw_stop_acquisition(int device_index, gpointer session_device_id);
	126
	127	static int hw_init(const char *deviceinfo)
	128	{
	129	struct sr_device_instance *sdi;
	130
	131	/* Avoid compiler warnings. */
	132	deviceinfo = deviceinfo;
	133
	134	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	135	if (!sdi) {
	136	sr_err("demo: %s: sr_device_instance_new failed", __func__);
	137	return 0;
	138	}
	139
	140	device_instances = g_slist_append(device_instances, sdi);
	141
	142	return 1;
	143	}
	144
	145	static int hw_opendev(int device_index)
	146	{
	147	/* Avoid compiler warnings. */
	148	device_index = device_index;
	149
	150	/* Nothing needed so far. */
	151
	152	return SR_OK;
	153	}
	154
	155	static int hw_closedev(int device_index)
	156	{
	157	/* Avoid compiler warnings. */
	158	device_index = device_index;
	159
	160	/* Nothing needed so far. */
	161
	162	return SR_OK;
	163	}
	164
	165	static void hw_cleanup(void)
	166	{
	167	/* Nothing needed so far. */
	168	}
	169
	170	static void *hw_get_device_info(int device_index, int device_info_id)
	171	{
	172	struct sr_device_instance *sdi;
	173	void *info = NULL;
	174
	175	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
	176	sr_err("demo: %s: sdi was NULL", __func__);
	177	return NULL;
	178	}
	179
	180	switch (device_info_id) {
	181	case SR_DI_INSTANCE:
	182	info = sdi;
	183	break;
	184	case SR_DI_NUM_PROBES:
	185	info = GINT_TO_POINTER(NUM_PROBES);
	186	break;
	187	case SR_DI_SAMPLERATES:
	188	info = &samplerates;
	189	break;
	190	case SR_DI_CUR_SAMPLERATE:
	191	info = &cur_samplerate;
	192	break;
	193	case SR_DI_PATTERNMODES:
	194	info = &pattern_strings;
	195	break;
	196	}
	197
	198	return info;
	199	}
	200
	201	static int hw_get_status(int device_index)
	202	{
	203	/* Avoid compiler warnings. */
	204	device_index = device_index;
	205
	206	return SR_ST_ACTIVE;
	207	}
	208
	209	static int *hw_get_capabilities(void)
	210	{
	211	return capabilities;
	212	}
	213
	214	static int hw_set_configuration(int device_index, int capability, void *value)
	215	{
	216	int ret;
	217	char *stropt;
	218
	219	/* Avoid compiler warnings. */
	220	device_index = device_index;
	221
	222	if (capability == SR_HWCAP_PROBECONFIG) {
	223	/* Nothing to do, but must be supported */
	224	ret = SR_OK;
	225	} else if (capability == SR_HWCAP_SAMPLERATE) {
	226	cur_samplerate = (uint64_t )value;
	227	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	228	cur_samplerate);
	229	ret = SR_OK;
	230	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
	231	limit_samples = (uint64_t )value;
	232	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	233	limit_samples);
	234	ret = SR_OK;
	235	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
	236	limit_msec = (uint64_t )value;
	237	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	238	limit_msec);
	239	ret = SR_OK;
	240	} else if (capability == SR_HWCAP_PATTERN_MODE) {
	241	stropt = value;
	242	ret = SR_OK;
	243	if (!strcmp(stropt, "sigrok")) {
	244	default_pattern = PATTERN_SIGROK;
	245	} else if (!strcmp(stropt, "random")) {
	246	default_pattern = PATTERN_RANDOM;
	247	} else if (!strcmp(stropt, "incremental")) {
	248	default_pattern = PATTERN_INC;
	249	} else if (!strcmp(stropt, "all-low")) {
	250	default_pattern = PATTERN_ALL_LOW;
	251	} else if (!strcmp(stropt, "all-high")) {
	252	default_pattern = PATTERN_ALL_HIGH;
	253	} else {
	254	ret = SR_ERR;
	255	}
	256	sr_dbg("demo: %s: setting pattern to %d", __func__,
	257	default_pattern);
	258	} else {
	259	ret = SR_ERR;
	260	}
	261
	262	return ret;
	263	}
	264
	265	static void samples_generator(uint8_t buf, uint64_t size, void data)
	266	{
	267	static uint64_t p = 0;
	268	struct databag *mydata = data;
	269	uint64_t i;
	270
	271	/* TODO: Needed? */
	272	memset(buf, 0, size);
	273
	274	switch (mydata->sample_generator) {
	275	case PATTERN_SIGROK: /* sigrok pattern */
	276	for (i = 0; i < size; i++) {
	277	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	278	if (++p == 64)
	279	p = 0;
	280	}
	281	break;
	282	case PATTERN_RANDOM: /* Random */
	283	for (i = 0; i < size; i++)
	284	*(buf + i) = (uint8_t)(rand() & 0xff);
	285	break;
	286	case PATTERN_INC: /* Simple increment */
	287	for (i = 0; i < size; i++)
	288	*(buf + i) = i;
	289	break;
	290	case PATTERN_ALL_LOW: /* All probes are low */
	291	memset(buf, 0x00, size);
	292	break;
	293	case PATTERN_ALL_HIGH: /* All probes are high */
	294	memset(buf, 0xff, size);
	295	break;
	296	default:
	297	/* TODO: Error handling. */
	298	break;
	299	}
	300	}
	301
	302	/* Thread function */
	303	static void thread_func(void *data)
	304	{
	305	struct databag *mydata = data;
	306	uint8_t buf[BUFSIZE];
	307	uint64_t nb_to_send = 0;
	308	int bytes_written;
	309	double time_cur, time_last, time_diff;
	310
	311	time_last = g_timer_elapsed(mydata->timer, NULL);
	312
	313	while (thread_running) {
	314	/* Rate control */
	315	time_cur = g_timer_elapsed(mydata->timer, NULL);
	316
	317	time_diff = time_cur - time_last;
	318	time_last = time_cur;
	319
	320	nb_to_send = cur_samplerate * time_diff;
	321
	322	if (limit_samples) {
	323	nb_to_send = MIN(nb_to_send,
	324	limit_samples - mydata->samples_counter);
	325	}
	326
	327	/* Make sure we don't overflow. */
	328	nb_to_send = MIN(nb_to_send, BUFSIZE);
	329
	330	if (nb_to_send) {
	331	samples_generator(buf, nb_to_send, data);
	332	mydata->samples_counter += nb_to_send;
	333
	334	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	335	nb_to_send, (gsize *)&bytes_written, NULL);
	336	}
	337
	338	/* Check if we're done. */
	339	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	340	(limit_samples && mydata->samples_counter >= limit_samples))
	341	{
	342	close(mydata->pipe_fds[1]);
	343	thread_running = 0;
	344	}
	345
	346	g_usleep(10);
	347	}
	348	}
	349
	350	/* Callback handling data */
	351	static int receive_data(int fd, int revents, void *user_data)
	352	{
	353	struct sr_datafeed_packet packet;
	354	char c[BUFSIZE];
	355	gsize z;
	356
	357	/* Avoid compiler warnings. */
	358	fd = fd;
	359	revents = revents;
	360
	361	do {
	362	g_io_channel_read_chars(channels[0],
	363	(gchar *)&c, BUFSIZE, &z, NULL);
	364
	365	if (z > 0) {
	366	packet.type = SR_DF_LOGIC;
	367	packet.length = z;
	368	packet.unitsize = 1;
	369	packet.payload = c;
	370	sr_session_bus(user_data, &packet);
	371	}
	372	} while (z > 0);
	373
	374	if (!thread_running && z <= 0) {
	375	/* Make sure we don't receive more packets. */
	376	g_io_channel_close(channels[0]);
	377
	378	/* Send last packet. */
	379	packet.type = SR_DF_END;
	380	sr_session_bus(user_data, &packet);
	381
	382	return FALSE;
	383	}
	384
	385	return TRUE;
	386	}
	387
	388	static int hw_start_acquisition(int device_index, gpointer session_device_id)
	389	{
	390	struct sr_datafeed_packet *packet;
	391	struct sr_datafeed_header *header;
	392	struct databag *mydata;
	393
	394	/* TODO: 'mydata' is never g_free()'d? */
	395	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	396	sr_err("demo: %s: mydata malloc failed", __func__);
	397	return SR_ERR_MALLOC;
	398	}
	399
	400	mydata->sample_generator = default_pattern;
	401	mydata->session_device_id = session_device_id;
	402	mydata->device_index = device_index;
	403	mydata->samples_counter = 0;
	404
	405	if (pipe(mydata->pipe_fds)) {
	406	/* TODO: Better error message. */
	407	sr_err("demo: %s: pipe() failed", __func__);
	408	return SR_ERR;
	409	}
	410
	411	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	412	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	413
	414	/* Set channel encoding to binary (default is UTF-8). */
	415	g_io_channel_set_encoding(channels[0], NULL, NULL);
	416	g_io_channel_set_encoding(channels[1], NULL, NULL);
	417
	418	/* Make channels to unbuffered. */
	419	g_io_channel_set_buffered(channels[0], FALSE);
	420	g_io_channel_set_buffered(channels[1], FALSE);
	421
	422	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	423	receive_data, session_device_id);
	424
	425	/* Run the demo thread. */
	426	g_thread_init(NULL);
	427	/* This must to be done between g_thread_init() & g_thread_create(). */
	428	mydata->timer = g_timer_new();
	429	thread_running = 1;
	430	my_thread =
	431	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	432	if (!my_thread) {
	433	sr_err("demo: %s: g_thread_create failed", __func__);
	434	return SR_ERR; /* TODO */
	435	}
	436
	437	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	438	sr_err("demo: %s: packet malloc failed", __func__);
	439	return SR_ERR_MALLOC;
	440	}
	441
	442	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	443	sr_err("demo: %s: header malloc failed", __func__);
	444	return SR_ERR_MALLOC;
	445	}
	446
	447	packet->type = SR_DF_HEADER;
	448	packet->length = sizeof(struct sr_datafeed_header);
	449	packet->payload = (unsigned char *)header;
	450	header->feed_version = 1;
	451	gettimeofday(&header->starttime, NULL);
	452	header->samplerate = cur_samplerate;
	453	header->protocol_id = SR_PROTO_RAW;
	454	header->num_logic_probes = NUM_PROBES;
	455	header->num_analog_probes = 0;
	456	sr_session_bus(session_device_id, packet);
	457	g_free(header);
	458	g_free(packet);
	459
	460	return SR_OK;
	461	}
	462
	463	static void hw_stop_acquisition(int device_index, gpointer session_device_id)
	464	{
	465	/* Avoid compiler warnings. */
	466	device_index = device_index;
	467	session_device_id = session_device_id;
	468
	469	/* Stop generate thread. */
	470	thread_running = 0;
	471	}
	472
	473	struct sr_device_plugin demo_plugin_info = {
	474	.name = "demo",
	475	.longname = "Demo driver and pattern generator",
	476	.api_version = 1,
	477	.init = hw_init,
	478	.cleanup = hw_cleanup,
	479	.opendev = hw_opendev,
	480	.closedev = hw_closedev,
	481	.get_device_info = hw_get_device_info,
	482	.get_status = hw_get_status,
	483	.get_capabilities = hw_get_capabilities,
	484	.set_configuration = hw_set_configuration,
	485	.start_acquisition = hw_start_acquisition,
	486	.stop_acquisition = hw_stop_acquisition,
	487	};