[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 */
		for (i = 0; i < size; i++)
			*(buf + i) = 0x00;
		break;
	case PATTERN_ALL_HIGH: /* All probes are high */
		for (i = 0; i < size; i++)
			*(buf + i) = 0xff;
		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	for (i = 0; i < size; i++)
	292	*(buf + i) = 0x00;
	293	break;
	294	case PATTERN_ALL_HIGH: /* All probes are high */
	295	for (i = 0; i < size; i++)
	296	*(buf + i) = 0xff;
	297	break;
	298	default:
	299	/* TODO: Error handling. */
	300	break;
	301	}
	302	}
	303
	304	/* Thread function */
	305	static void thread_func(void *data)
	306	{
	307	struct databag *mydata = data;
	308	uint8_t buf[BUFSIZE];
	309	uint64_t nb_to_send = 0;
	310	int bytes_written;
	311	double time_cur, time_last, time_diff;
	312
	313	time_last = g_timer_elapsed(mydata->timer, NULL);
	314
	315	while (thread_running) {
	316	/* Rate control */
	317	time_cur = g_timer_elapsed(mydata->timer, NULL);
	318
	319	time_diff = time_cur - time_last;
	320	time_last = time_cur;
	321
	322	nb_to_send = cur_samplerate * time_diff;
	323
	324	if (limit_samples) {
	325	nb_to_send = MIN(nb_to_send,
	326	limit_samples - mydata->samples_counter);
	327	}
	328
	329	/* Make sure we don't overflow. */
	330	nb_to_send = MIN(nb_to_send, BUFSIZE);
	331
	332	if (nb_to_send) {
	333	samples_generator(buf, nb_to_send, data);
	334	mydata->samples_counter += nb_to_send;
	335
	336	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	337	nb_to_send, (gsize *)&bytes_written, NULL);
	338	}
	339
	340	/* Check if we're done. */
	341	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	342	(limit_samples && mydata->samples_counter >= limit_samples))
	343	{
	344	close(mydata->pipe_fds[1]);
	345	thread_running = 0;
	346	}
	347
	348	g_usleep(10);
	349	}
	350	}
	351
	352	/* Callback handling data */
	353	static int receive_data(int fd, int revents, void *user_data)
	354	{
	355	struct sr_datafeed_packet packet;
	356	char c[BUFSIZE];
	357	gsize z;
	358
	359	/* Avoid compiler warnings. */
	360	fd = fd;
	361	revents = revents;
	362
	363	do {
	364	g_io_channel_read_chars(channels[0],
	365	(gchar *)&c, BUFSIZE, &z, NULL);
	366
	367	if (z > 0) {
	368	packet.type = SR_DF_LOGIC;
	369	packet.length = z;
	370	packet.unitsize = 1;
	371	packet.payload = c;
	372	sr_session_bus(user_data, &packet);
	373	}
	374	} while (z > 0);
	375
	376	if (!thread_running && z <= 0) {
	377	/* Make sure we don't receive more packets. */
	378	g_io_channel_close(channels[0]);
	379
	380	/* Send last packet. */
	381	packet.type = SR_DF_END;
	382	sr_session_bus(user_data, &packet);
	383
	384	return FALSE;
	385	}
	386
	387	return TRUE;
	388	}
	389
	390	static int hw_start_acquisition(int device_index, gpointer session_device_id)
	391	{
	392	struct sr_datafeed_packet *packet;
	393	struct sr_datafeed_header *header;
	394	struct databag *mydata;
	395
	396	/* TODO: 'mydata' is never g_free()'d? */
	397	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	398	sr_err("demo: %s: mydata malloc failed", __func__);
	399	return SR_ERR_MALLOC;
	400	}
	401
	402	mydata->sample_generator = default_pattern;
	403	mydata->session_device_id = session_device_id;
	404	mydata->device_index = device_index;
	405	mydata->samples_counter = 0;
	406
	407	if (pipe(mydata->pipe_fds)) {
	408	/* TODO: Better error message. */
	409	sr_err("demo: %s: pipe() failed", __func__);
	410	return SR_ERR;
	411	}
	412
	413	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	414	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	415
	416	/* Set channel encoding to binary (default is UTF-8). */
	417	g_io_channel_set_encoding(channels[0], NULL, NULL);
	418	g_io_channel_set_encoding(channels[1], NULL, NULL);
	419
	420	/* Make channels to unbuffered. */
	421	g_io_channel_set_buffered(channels[0], FALSE);
	422	g_io_channel_set_buffered(channels[1], FALSE);
	423
	424	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	425	receive_data, session_device_id);
	426
	427	/* Run the demo thread. */
	428	g_thread_init(NULL);
	429	/* This must to be done between g_thread_init() & g_thread_create(). */
	430	mydata->timer = g_timer_new();
	431	thread_running = 1;
	432	my_thread =
	433	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	434	if (!my_thread) {
	435	sr_err("demo: %s: g_thread_create failed", __func__);
	436	return SR_ERR; /* TODO */
	437	}
	438
	439	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	440	sr_err("demo: %s: packet malloc failed", __func__);
	441	return SR_ERR_MALLOC;
	442	}
	443
	444	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	445	sr_err("demo: %s: header malloc failed", __func__);
	446	return SR_ERR_MALLOC;
	447	}
	448
	449	packet->type = SR_DF_HEADER;
	450	packet->length = sizeof(struct sr_datafeed_header);
	451	packet->payload = (unsigned char *)header;
	452	header->feed_version = 1;
	453	gettimeofday(&header->starttime, NULL);
	454	header->samplerate = cur_samplerate;
	455	header->protocol_id = SR_PROTO_RAW;
	456	header->num_logic_probes = NUM_PROBES;
	457	header->num_analog_probes = 0;
	458	sr_session_bus(session_device_id, packet);
	459	g_free(header);
	460	g_free(packet);
	461
	462	return SR_OK;
	463	}
	464
	465	static void hw_stop_acquisition(int device_index, gpointer session_device_id)
	466	{
	467	/* Avoid compiler warnings. */
	468	device_index = device_index;
	469	session_device_id = session_device_id;
	470
	471	/* Stop generate thread. */
	472	thread_running = 0;
	473	}
	474
	475	struct sr_device_plugin demo_plugin_info = {
	476	.name = "demo",
	477	.longname = "Demo driver and pattern generator",
	478	.api_version = 1,
	479	.init = hw_init,
	480	.cleanup = hw_cleanup,
	481	.opendev = hw_opendev,
	482	.closedev = hw_closedev,
	483	.get_device_info = hw_get_device_info,
	484	.get_status = hw_get_status,
	485	.get_capabilities = hw_get_capabilities,
	486	.set_configuration = hw_set_configuration,
	487	.start_acquisition = hw_start_acquisition,
	488	.stop_acquisition = hw_stop_acquisition,
	489	};