[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>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "sigrok.h"
#include "sigrok-internal.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. */
SR_PRIV 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_data;
	GTimer *timer;
};

static int capabilities[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_DEMO_DEVICE,
	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 const char *probe_names[NUM_PROBES + 1] = {
	"0",
	"1",
	"2",
	"3",
	"4",
	"5",
	"6",
	"7",
	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_data);

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

	/* Avoid compiler warnings. */
	(void)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. */
	(void)device_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_closedev(int device_index)
{
	/* Avoid compiler warnings. */
	(void)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_PROBE_NAMES:
		info = probe_names;
		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. */
	(void)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. */
	(void)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 *session_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	static uint64_t samples_received = 0;
	unsigned char c[BUFSIZE];
	gsize z;

	/* Avoid compiler warnings. */
	(void)fd;
	(void)revents;

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

		if (z > 0) {
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = z;
			logic.unitsize = 1;
			logic.data = c;
			sr_session_bus(session_data, &packet);
			samples_received += z;
		}
	} 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(session_data, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_start_acquisition(int device_index, gpointer session_data)
{
	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_data = session_data;
	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_data);

	/* 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->payload = header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->num_logic_probes = NUM_PROBES;
	header->num_analog_probes = 0;
	sr_session_bus(session_data, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

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

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

SR_PRIV 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	#ifdef _WIN32
	26	#include <io.h>
	27	#include <fcntl.h>
	28	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	29	#endif
	30	#include "sigrok.h"
	31	#include "sigrok-internal.h"
	32
	33	/* TODO: Number of probes should be configurable. */
	34	#define NUM_PROBES 8
	35
	36	#define DEMONAME "Demo device"
	37
	38	/* The size of chunks to send through the session bus. */
	39	/* TODO: Should be configurable. */
	40	#define BUFSIZE 4096
	41
	42	/* Supported patterns which we can generate */
	43	enum {
	44	/**
	45	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	46	* when displayed using the 'bits' output format.
	47	*/
	48	PATTERN_SIGROK,
	49
	50	/** Pattern which consists of (pseudo-)random values on all probes. */
	51	PATTERN_RANDOM,
	52
	53	/**
	54	* Pattern which consists of incrementing numbers.
	55	* TODO: Better description.
	56	*/
	57	PATTERN_INC,
	58
	59	/** Pattern where all probes have a low logic state. */
	60	PATTERN_ALL_LOW,
	61
	62	/** Pattern where all probes have a high logic state. */
	63	PATTERN_ALL_HIGH,
	64	};
	65
	66	/* FIXME: Should not be global. */
	67	SR_PRIV GIOChannel *channels[2];
	68
	69	struct databag {
	70	int pipe_fds[2];
	71	uint8_t sample_generator;
	72	uint8_t thread_running;
	73	uint64_t samples_counter;
	74	int device_index;
	75	gpointer session_data;
	76	GTimer *timer;
	77	};
	78
	79	static int capabilities[] = {
	80	SR_HWCAP_LOGIC_ANALYZER,
	81	SR_HWCAP_DEMO_DEVICE,
	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 const char *probe_names[NUM_PROBES + 1] = {
	106	"0",
	107	"1",
	108	"2",
	109	"3",
	110	"4",
	111	"5",
	112	"6",
	113	"7",
	114	NULL,
	115	};
	116
	117	static uint8_t pattern_sigrok[] = {
	118	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	119	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	120	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	121	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	122	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	123	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	124	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	125	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	126	};
	127
	128	/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
	129	static GSList *device_instances = NULL;
	130	static uint64_t cur_samplerate = SR_KHZ(200);
	131	static uint64_t limit_samples = 0;
	132	static uint64_t limit_msec = 0;
	133	static int default_pattern = PATTERN_SIGROK;
	134	static GThread *my_thread;
	135	static int thread_running;
	136
	137	static void hw_stop_acquisition(int device_index, gpointer session_data);
	138
	139	static int hw_init(const char *deviceinfo)
	140	{
	141	struct sr_device_instance *sdi;
	142
	143	/* Avoid compiler warnings. */
	144	(void)deviceinfo;
	145
	146	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	147	if (!sdi) {
	148	sr_err("demo: %s: sr_device_instance_new failed", __func__);
	149	return 0;
	150	}
	151
	152	device_instances = g_slist_append(device_instances, sdi);
	153
	154	return 1;
	155	}
	156
	157	static int hw_opendev(int device_index)
	158	{
	159	/* Avoid compiler warnings. */
	160	(void)device_index;
	161
	162	/* Nothing needed so far. */
	163
	164	return SR_OK;
	165	}
	166
	167	static int hw_closedev(int device_index)
	168	{
	169	/* Avoid compiler warnings. */
	170	(void)device_index;
	171
	172	/* Nothing needed so far. */
	173
	174	return SR_OK;
	175	}
	176
	177	static void hw_cleanup(void)
	178	{
	179	/* Nothing needed so far. */
	180	}
	181
	182	static void *hw_get_device_info(int device_index, int device_info_id)
	183	{
	184	struct sr_device_instance *sdi;
	185	void *info = NULL;
	186
	187	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
	188	sr_err("demo: %s: sdi was NULL", __func__);
	189	return NULL;
	190	}
	191
	192	switch (device_info_id) {
	193	case SR_DI_INSTANCE:
	194	info = sdi;
	195	break;
	196	case SR_DI_NUM_PROBES:
	197	info = GINT_TO_POINTER(NUM_PROBES);
	198	break;
	199	case SR_DI_PROBE_NAMES:
	200	info = probe_names;
	201	break;
	202	case SR_DI_SAMPLERATES:
	203	info = &samplerates;
	204	break;
	205	case SR_DI_CUR_SAMPLERATE:
	206	info = &cur_samplerate;
	207	break;
	208	case SR_DI_PATTERNMODES:
	209	info = &pattern_strings;
	210	break;
	211	}
	212
	213	return info;
	214	}
	215
	216	static int hw_get_status(int device_index)
	217	{
	218	/* Avoid compiler warnings. */
	219	(void)device_index;
	220
	221	return SR_ST_ACTIVE;
	222	}
	223
	224	static int *hw_get_capabilities(void)
	225	{
	226	return capabilities;
	227	}
	228
	229	static int hw_set_configuration(int device_index, int capability, void *value)
	230	{
	231	int ret;
	232	char *stropt;
	233
	234	/* Avoid compiler warnings. */
	235	(void)device_index;
	236
	237	if (capability == SR_HWCAP_PROBECONFIG) {
	238	/* Nothing to do, but must be supported */
	239	ret = SR_OK;
	240	} else if (capability == SR_HWCAP_SAMPLERATE) {
	241	cur_samplerate = (uint64_t )value;
	242	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	243	cur_samplerate);
	244	ret = SR_OK;
	245	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
	246	limit_samples = (uint64_t )value;
	247	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	248	limit_samples);
	249	ret = SR_OK;
	250	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
	251	limit_msec = (uint64_t )value;
	252	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	253	limit_msec);
	254	ret = SR_OK;
	255	} else if (capability == SR_HWCAP_PATTERN_MODE) {
	256	stropt = value;
	257	ret = SR_OK;
	258	if (!strcmp(stropt, "sigrok")) {
	259	default_pattern = PATTERN_SIGROK;
	260	} else if (!strcmp(stropt, "random")) {
	261	default_pattern = PATTERN_RANDOM;
	262	} else if (!strcmp(stropt, "incremental")) {
	263	default_pattern = PATTERN_INC;
	264	} else if (!strcmp(stropt, "all-low")) {
	265	default_pattern = PATTERN_ALL_LOW;
	266	} else if (!strcmp(stropt, "all-high")) {
	267	default_pattern = PATTERN_ALL_HIGH;
	268	} else {
	269	ret = SR_ERR;
	270	}
	271	sr_dbg("demo: %s: setting pattern to %d", __func__,
	272	default_pattern);
	273	} else {
	274	ret = SR_ERR;
	275	}
	276
	277	return ret;
	278	}
	279
	280	static void samples_generator(uint8_t buf, uint64_t size, void data)
	281	{
	282	static uint64_t p = 0;
	283	struct databag *mydata = data;
	284	uint64_t i;
	285
	286	/* TODO: Needed? */
	287	memset(buf, 0, size);
	288
	289	switch (mydata->sample_generator) {
	290	case PATTERN_SIGROK: /* sigrok pattern */
	291	for (i = 0; i < size; i++) {
	292	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	293	if (++p == 64)
	294	p = 0;
	295	}
	296	break;
	297	case PATTERN_RANDOM: /* Random */
	298	for (i = 0; i < size; i++)
	299	*(buf + i) = (uint8_t)(rand() & 0xff);
	300	break;
	301	case PATTERN_INC: /* Simple increment */
	302	for (i = 0; i < size; i++)
	303	*(buf + i) = i;
	304	break;
	305	case PATTERN_ALL_LOW: /* All probes are low */
	306	memset(buf, 0x00, size);
	307	break;
	308	case PATTERN_ALL_HIGH: /* All probes are high */
	309	memset(buf, 0xff, size);
	310	break;
	311	default:
	312	/* TODO: Error handling. */
	313	break;
	314	}
	315	}
	316
	317	/* Thread function */
	318	static void thread_func(void *data)
	319	{
	320	struct databag *mydata = data;
	321	uint8_t buf[BUFSIZE];
	322	uint64_t nb_to_send = 0;
	323	int bytes_written;
	324	double time_cur, time_last, time_diff;
	325
	326	time_last = g_timer_elapsed(mydata->timer, NULL);
	327
	328	while (thread_running) {
	329	/* Rate control */
	330	time_cur = g_timer_elapsed(mydata->timer, NULL);
	331
	332	time_diff = time_cur - time_last;
	333	time_last = time_cur;
	334
	335	nb_to_send = cur_samplerate * time_diff;
	336
	337	if (limit_samples) {
	338	nb_to_send = MIN(nb_to_send,
	339	limit_samples - mydata->samples_counter);
	340	}
	341
	342	/* Make sure we don't overflow. */
	343	nb_to_send = MIN(nb_to_send, BUFSIZE);
	344
	345	if (nb_to_send) {
	346	samples_generator(buf, nb_to_send, data);
	347	mydata->samples_counter += nb_to_send;
	348
	349	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	350	nb_to_send, (gsize *)&bytes_written, NULL);
	351	}
	352
	353	/* Check if we're done. */
	354	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	355	(limit_samples && mydata->samples_counter >= limit_samples))
	356	{
	357	close(mydata->pipe_fds[1]);
	358	thread_running = 0;
	359	}
	360
	361	g_usleep(10);
	362	}
	363	}
	364
	365	/* Callback handling data */
	366	static int receive_data(int fd, int revents, void *session_data)
	367	{
	368	struct sr_datafeed_packet packet;
	369	struct sr_datafeed_logic logic;
	370	static uint64_t samples_received = 0;
	371	unsigned char c[BUFSIZE];
	372	gsize z;
	373
	374	/* Avoid compiler warnings. */
	375	(void)fd;
	376	(void)revents;
	377
	378	do {
	379	g_io_channel_read_chars(channels[0],
	380	(gchar *)&c, BUFSIZE, &z, NULL);
	381
	382	if (z > 0) {
	383	packet.type = SR_DF_LOGIC;
	384	packet.payload = &logic;
	385	logic.length = z;
	386	logic.unitsize = 1;
	387	logic.data = c;
	388	sr_session_bus(session_data, &packet);
	389	samples_received += z;
	390	}
	391	} while (z > 0);
	392
	393	if (!thread_running && z <= 0) {
	394	/* Make sure we don't receive more packets. */
	395	g_io_channel_close(channels[0]);
	396
	397	/* Send last packet. */
	398	packet.type = SR_DF_END;
	399	sr_session_bus(session_data, &packet);
	400
	401	return FALSE;
	402	}
	403
	404	return TRUE;
	405	}
	406
	407	static int hw_start_acquisition(int device_index, gpointer session_data)
	408	{
	409	struct sr_datafeed_packet *packet;
	410	struct sr_datafeed_header *header;
	411	struct databag *mydata;
	412
	413	/* TODO: 'mydata' is never g_free()'d? */
	414	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	415	sr_err("demo: %s: mydata malloc failed", __func__);
	416	return SR_ERR_MALLOC;
	417	}
	418
	419	mydata->sample_generator = default_pattern;
	420	mydata->session_data = session_data;
	421	mydata->device_index = device_index;
	422	mydata->samples_counter = 0;
	423
	424	if (pipe(mydata->pipe_fds)) {
	425	/* TODO: Better error message. */
	426	sr_err("demo: %s: pipe() failed", __func__);
	427	return SR_ERR;
	428	}
	429
	430	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	431	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	432
	433	/* Set channel encoding to binary (default is UTF-8). */
	434	g_io_channel_set_encoding(channels[0], NULL, NULL);
	435	g_io_channel_set_encoding(channels[1], NULL, NULL);
	436
	437	/* Make channels to unbuffered. */
	438	g_io_channel_set_buffered(channels[0], FALSE);
	439	g_io_channel_set_buffered(channels[1], FALSE);
	440
	441	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	442	receive_data, session_data);
	443
	444	/* Run the demo thread. */
	445	g_thread_init(NULL);
	446	/* This must to be done between g_thread_init() & g_thread_create(). */
	447	mydata->timer = g_timer_new();
	448	thread_running = 1;
	449	my_thread =
	450	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	451	if (!my_thread) {
	452	sr_err("demo: %s: g_thread_create failed", __func__);
	453	return SR_ERR; /* TODO */
	454	}
	455
	456	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	457	sr_err("demo: %s: packet malloc failed", __func__);
	458	return SR_ERR_MALLOC;
	459	}
	460
	461	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	462	sr_err("demo: %s: header malloc failed", __func__);
	463	return SR_ERR_MALLOC;
	464	}
	465
	466	packet->type = SR_DF_HEADER;
	467	packet->payload = header;
	468	header->feed_version = 1;
	469	gettimeofday(&header->starttime, NULL);
	470	header->samplerate = cur_samplerate;
	471	header->num_logic_probes = NUM_PROBES;
	472	header->num_analog_probes = 0;
	473	sr_session_bus(session_data, packet);
	474	g_free(header);
	475	g_free(packet);
	476
	477	return SR_OK;
	478	}
	479
	480	static void hw_stop_acquisition(int device_index, gpointer session_data)
	481	{
	482	/* Avoid compiler warnings. */
	483	(void)device_index;
	484	(void)session_data;
	485
	486	/* Stop generate thread. */
	487	thread_running = 0;
	488	}
	489
	490	SR_PRIV struct sr_device_plugin demo_plugin_info = {
	491	.name = "demo",
	492	.longname = "Demo driver and pattern generator",
	493	.api_version = 1,
	494	.init = hw_init,
	495	.cleanup = hw_cleanup,
	496	.opendev = hw_opendev,
	497	.closedev = hw_closedev,
	498	.get_device_info = hw_get_device_info,
	499	.get_status = hw_get_status,
	500	.get_capabilities = hw_get_capabilities,
	501	.set_configuration = hw_set_configuration,
	502	.start_acquisition = hw_start_acquisition,
	503	.stop_acquisition = hw_stop_acquisition,
	504	};