[libsigrok.git] / 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 dev_index;
	gpointer session_data;
	GTimer *timer;
};

static int hwcaps[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_DEMO_DEV,
	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,
};

/* Private, per-device-instance driver context. */
/* TODO: struct context as with the other drivers. */

/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
static GSList *dev_insts = 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 int hw_dev_acquisition_stop(int dev_index, gpointer session_data);

static int hw_init(const char *devinfo)
{
	struct sr_dev_inst *sdi;

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

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

	dev_insts = g_slist_append(dev_insts, sdi);

	return 1;
}

static int hw_dev_open(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_dev_close(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_cleanup(void)
{
	/* Nothing needed so far. */
	return SR_OK;
}

static void *hw_dev_info_get(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	void *info = NULL;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
		sr_err("demo: %s: sdi was NULL", __func__);
		return NULL;
	}

	switch (dev_info_id) {
	case SR_DI_INST:
		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_dev_status_get(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	return SR_ST_ACTIVE;
}

static int *hw_hwcap_get_all(void)
{
	return hwcaps;
}

static int hw_dev_config_set(int dev_index, int hwcap, void *value)
{
	int ret;
	char *stropt;

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

	if (hwcap == SR_HWCAP_PROBECONFIG) {
		/* Nothing to do, but must be supported */
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(uint64_t *)value;
		sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (hwcap == 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 (hwcap == 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 (hwcap == 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_dev_acquisition_start(int dev_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->dev_index = dev_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;
	sr_session_bus(session_data, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

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

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

	return SR_OK;
}

SR_PRIV struct sr_dev_plugin demo_plugin_info = {
	.name = "demo",
	.longname = "Demo driver and pattern generator",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_info_get = hw_dev_info_get,
	.dev_status_get = hw_dev_status_get,
	.hwcap_get_all = hw_hwcap_get_all,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
};
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 dev_index;
	75	gpointer session_data;
	76	GTimer *timer;
	77	};
	78
	79	static int hwcaps[] = {
	80	SR_HWCAP_LOGIC_ANALYZER,
	81	SR_HWCAP_DEMO_DEV,
	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	/* Private, per-device-instance driver context. */
	129	/* TODO: struct context as with the other drivers. */
	130
	131	/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
	132	static GSList *dev_insts = NULL;
	133	static uint64_t cur_samplerate = SR_KHZ(200);
	134	static uint64_t limit_samples = 0;
	135	static uint64_t limit_msec = 0;
	136	static int default_pattern = PATTERN_SIGROK;
	137	static GThread *my_thread;
	138	static int thread_running;
	139
	140	static int hw_dev_acquisition_stop(int dev_index, gpointer session_data);
	141
	142	static int hw_init(const char *devinfo)
	143	{
	144	struct sr_dev_inst *sdi;
	145
	146	/* Avoid compiler warnings. */
	147	(void)devinfo;
	148
	149	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	150	if (!sdi) {
	151	sr_err("demo: %s: sr_dev_inst_new failed", __func__);
	152	return 0;
	153	}
	154
	155	dev_insts = g_slist_append(dev_insts, sdi);
	156
	157	return 1;
	158	}
	159
	160	static int hw_dev_open(int dev_index)
	161	{
	162	/* Avoid compiler warnings. */
	163	(void)dev_index;
	164
	165	/* Nothing needed so far. */
	166
	167	return SR_OK;
	168	}
	169
	170	static int hw_dev_close(int dev_index)
	171	{
	172	/* Avoid compiler warnings. */
	173	(void)dev_index;
	174
	175	/* Nothing needed so far. */
	176
	177	return SR_OK;
	178	}
	179
	180	static int hw_cleanup(void)
	181	{
	182	/* Nothing needed so far. */
	183	return SR_OK;
	184	}
	185
	186	static void *hw_dev_info_get(int dev_index, int dev_info_id)
	187	{
	188	struct sr_dev_inst *sdi;
	189	void *info = NULL;
	190
	191	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
	192	sr_err("demo: %s: sdi was NULL", __func__);
	193	return NULL;
	194	}
	195
	196	switch (dev_info_id) {
	197	case SR_DI_INST:
	198	info = sdi;
	199	break;
	200	case SR_DI_NUM_PROBES:
	201	info = GINT_TO_POINTER(NUM_PROBES);
	202	break;
	203	case SR_DI_PROBE_NAMES:
	204	info = probe_names;
	205	break;
	206	case SR_DI_SAMPLERATES:
	207	info = &samplerates;
	208	break;
	209	case SR_DI_CUR_SAMPLERATE:
	210	info = &cur_samplerate;
	211	break;
	212	case SR_DI_PATTERNMODES:
	213	info = &pattern_strings;
	214	break;
	215	}
	216
	217	return info;
	218	}
	219
	220	static int hw_dev_status_get(int dev_index)
	221	{
	222	/* Avoid compiler warnings. */
	223	(void)dev_index;
	224
	225	return SR_ST_ACTIVE;
	226	}
	227
	228	static int *hw_hwcap_get_all(void)
	229	{
	230	return hwcaps;
	231	}
	232
	233	static int hw_dev_config_set(int dev_index, int hwcap, void *value)
	234	{
	235	int ret;
	236	char *stropt;
	237
	238	/* Avoid compiler warnings. */
	239	(void)dev_index;
	240
	241	if (hwcap == SR_HWCAP_PROBECONFIG) {
	242	/* Nothing to do, but must be supported */
	243	ret = SR_OK;
	244	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
	245	cur_samplerate = (uint64_t )value;
	246	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	247	cur_samplerate);
	248	ret = SR_OK;
	249	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	250	limit_samples = (uint64_t )value;
	251	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	252	limit_samples);
	253	ret = SR_OK;
	254	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	255	limit_msec = (uint64_t )value;
	256	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	257	limit_msec);
	258	ret = SR_OK;
	259	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	260	stropt = value;
	261	ret = SR_OK;
	262	if (!strcmp(stropt, "sigrok")) {
	263	default_pattern = PATTERN_SIGROK;
	264	} else if (!strcmp(stropt, "random")) {
	265	default_pattern = PATTERN_RANDOM;
	266	} else if (!strcmp(stropt, "incremental")) {
	267	default_pattern = PATTERN_INC;
	268	} else if (!strcmp(stropt, "all-low")) {
	269	default_pattern = PATTERN_ALL_LOW;
	270	} else if (!strcmp(stropt, "all-high")) {
	271	default_pattern = PATTERN_ALL_HIGH;
	272	} else {
	273	ret = SR_ERR;
	274	}
	275	sr_dbg("demo: %s: setting pattern to %d", __func__,
	276	default_pattern);
	277	} else {
	278	ret = SR_ERR;
	279	}
	280
	281	return ret;
	282	}
	283
	284	static void samples_generator(uint8_t buf, uint64_t size, void data)
	285	{
	286	static uint64_t p = 0;
	287	struct databag *mydata = data;
	288	uint64_t i;
	289
	290	/* TODO: Needed? */
	291	memset(buf, 0, size);
	292
	293	switch (mydata->sample_generator) {
	294	case PATTERN_SIGROK: /* sigrok pattern */
	295	for (i = 0; i < size; i++) {
	296	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	297	if (++p == 64)
	298	p = 0;
	299	}
	300	break;
	301	case PATTERN_RANDOM: /* Random */
	302	for (i = 0; i < size; i++)
	303	*(buf + i) = (uint8_t)(rand() & 0xff);
	304	break;
	305	case PATTERN_INC: /* Simple increment */
	306	for (i = 0; i < size; i++)
	307	*(buf + i) = i;
	308	break;
	309	case PATTERN_ALL_LOW: /* All probes are low */
	310	memset(buf, 0x00, size);
	311	break;
	312	case PATTERN_ALL_HIGH: /* All probes are high */
	313	memset(buf, 0xff, size);
	314	break;
	315	default:
	316	/* TODO: Error handling. */
	317	break;
	318	}
	319	}
	320
	321	/* Thread function */
	322	static void thread_func(void *data)
	323	{
	324	struct databag *mydata = data;
	325	uint8_t buf[BUFSIZE];
	326	uint64_t nb_to_send = 0;
	327	int bytes_written;
	328	double time_cur, time_last, time_diff;
	329
	330	time_last = g_timer_elapsed(mydata->timer, NULL);
	331
	332	while (thread_running) {
	333	/* Rate control */
	334	time_cur = g_timer_elapsed(mydata->timer, NULL);
	335
	336	time_diff = time_cur - time_last;
	337	time_last = time_cur;
	338
	339	nb_to_send = cur_samplerate * time_diff;
	340
	341	if (limit_samples) {
	342	nb_to_send = MIN(nb_to_send,
	343	limit_samples - mydata->samples_counter);
	344	}
	345
	346	/* Make sure we don't overflow. */
	347	nb_to_send = MIN(nb_to_send, BUFSIZE);
	348
	349	if (nb_to_send) {
	350	samples_generator(buf, nb_to_send, data);
	351	mydata->samples_counter += nb_to_send;
	352
	353	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	354	nb_to_send, (gsize *)&bytes_written, NULL);
	355	}
	356
	357	/* Check if we're done. */
	358	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	359	(limit_samples && mydata->samples_counter >= limit_samples))
	360	{
	361	close(mydata->pipe_fds[1]);
	362	thread_running = 0;
	363	}
	364
	365	g_usleep(10);
	366	}
	367	}
	368
	369	/* Callback handling data */
	370	static int receive_data(int fd, int revents, void *session_data)
	371	{
	372	struct sr_datafeed_packet packet;
	373	struct sr_datafeed_logic logic;
	374	static uint64_t samples_received = 0;
	375	unsigned char c[BUFSIZE];
	376	gsize z;
	377
	378	/* Avoid compiler warnings. */
	379	(void)fd;
	380	(void)revents;
	381
	382	do {
	383	g_io_channel_read_chars(channels[0],
	384	(gchar *)&c, BUFSIZE, &z, NULL);
	385
	386	if (z > 0) {
	387	packet.type = SR_DF_LOGIC;
	388	packet.payload = &logic;
	389	logic.length = z;
	390	logic.unitsize = 1;
	391	logic.data = c;
	392	sr_session_bus(session_data, &packet);
	393	samples_received += z;
	394	}
	395	} while (z > 0);
	396
	397	if (!thread_running && z <= 0) {
	398	/* Make sure we don't receive more packets. */
	399	g_io_channel_close(channels[0]);
	400
	401	/* Send last packet. */
	402	packet.type = SR_DF_END;
	403	sr_session_bus(session_data, &packet);
	404
	405	return FALSE;
	406	}
	407
	408	return TRUE;
	409	}
	410
	411	static int hw_dev_acquisition_start(int dev_index, gpointer session_data)
	412	{
	413	struct sr_datafeed_packet *packet;
	414	struct sr_datafeed_header *header;
	415	struct databag *mydata;
	416
	417	/* TODO: 'mydata' is never g_free()'d? */
	418	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	419	sr_err("demo: %s: mydata malloc failed", __func__);
	420	return SR_ERR_MALLOC;
	421	}
	422
	423	mydata->sample_generator = default_pattern;
	424	mydata->session_data = session_data;
	425	mydata->dev_index = dev_index;
	426	mydata->samples_counter = 0;
	427
	428	if (pipe(mydata->pipe_fds)) {
	429	/* TODO: Better error message. */
	430	sr_err("demo: %s: pipe() failed", __func__);
	431	return SR_ERR;
	432	}
	433
	434	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	435	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	436
	437	/* Set channel encoding to binary (default is UTF-8). */
	438	g_io_channel_set_encoding(channels[0], NULL, NULL);
	439	g_io_channel_set_encoding(channels[1], NULL, NULL);
	440
	441	/* Make channels to unbuffered. */
	442	g_io_channel_set_buffered(channels[0], FALSE);
	443	g_io_channel_set_buffered(channels[1], FALSE);
	444
	445	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	446	receive_data, session_data);
	447
	448	/* Run the demo thread. */
	449	g_thread_init(NULL);
	450	/* This must to be done between g_thread_init() & g_thread_create(). */
	451	mydata->timer = g_timer_new();
	452	thread_running = 1;
	453	my_thread =
	454	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	455	if (!my_thread) {
	456	sr_err("demo: %s: g_thread_create failed", __func__);
	457	return SR_ERR; /* TODO */
	458	}
	459
	460	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	461	sr_err("demo: %s: packet malloc failed", __func__);
	462	return SR_ERR_MALLOC;
	463	}
	464
	465	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	466	sr_err("demo: %s: header malloc failed", __func__);
	467	return SR_ERR_MALLOC;
	468	}
	469
	470	packet->type = SR_DF_HEADER;
	471	packet->payload = header;
	472	header->feed_version = 1;
	473	gettimeofday(&header->starttime, NULL);
	474	header->samplerate = cur_samplerate;
	475	header->num_logic_probes = NUM_PROBES;
	476	sr_session_bus(session_data, packet);
	477	g_free(header);
	478	g_free(packet);
	479
	480	return SR_OK;
	481	}
	482
	483	static int hw_dev_acquisition_stop(int dev_index, gpointer session_data)
	484	{
	485	/* Avoid compiler warnings. */
	486	(void)dev_index;
	487	(void)session_data;
	488
	489	/* Stop generate thread. */
	490	thread_running = 0;
	491
	492	return SR_OK;
	493	}
	494
	495	SR_PRIV struct sr_dev_plugin demo_plugin_info = {
	496	.name = "demo",
	497	.longname = "Demo driver and pattern generator",
	498	.api_version = 1,
	499	.init = hw_init,
	500	.cleanup = hw_cleanup,
	501	.dev_open = hw_dev_open,
	502	.dev_close = hw_dev_close,
	503	.dev_info_get = hw_dev_info_get,
	504	.dev_status_get = hw_dev_status_get,
	505	.hwcap_get_all = hw_hwcap_get_all,
	506	.dev_config_set = hw_dev_config_set,
	507	.dev_acquisition_start = hw_dev_acquisition_start,
	508	.dev_acquisition_stop = hw_dev_acquisition_stop,
	509	};