[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 "libsigrok.h"
#include "libsigrok-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. */

struct context {
	int pipe_fds[2];
	GIOChannel *channels[2];
	uint8_t sample_generator;
	uint8_t thread_running;
	uint64_t samples_counter;
	int dev_index;
	void *session_dev_id;
	GTimer *timer;
};

static const 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 const 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,
};

/* We name the probes 0-7 on our demo driver. */
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, void *cb_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 const void *hw_dev_info_get(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	const 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_PATTERNS:
		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 const int *hw_hwcap_get_all(void)
{
	return hwcaps;
}

static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
{
	int ret;
	const 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 = *(const 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_msec = 0;
		limit_samples = *(const 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 = *(const uint64_t *)value;
		limit_samples = 0;
		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 context *ctx = data;
	uint64_t i;

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

	switch (ctx->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:
		sr_err("demo: %s: unknown pattern %d", __func__,
		       ctx->sample_generator);
		break;
	}
}

/* Thread function */
static void thread_func(void *data)
{
	struct context *ctx = 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(ctx->timer, NULL);

	while (thread_running) {
		/* Rate control */
		time_cur = g_timer_elapsed(ctx->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 - ctx->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);
			ctx->samples_counter += nb_to_send;

			g_io_channel_write_chars(ctx->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 && ctx->samples_counter >= limit_samples))
		{
			close(ctx->pipe_fds[1]);
			thread_running = 0;
		}

		g_usleep(10);
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *cb_data)
{
	struct context *ctx = cb_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(ctx->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_send(ctx->session_dev_id, &packet);
			samples_received += z;
		}
	} while (z > 0);

	if (!thread_running && z <= 0) {
		/* Make sure we don't receive more packets. */
		g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_send(ctx->session_dev_id, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_dev_acquisition_start(int dev_index, void *cb_data)
{
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_header *header;
	struct sr_datafeed_meta_logic meta;
	struct context *ctx;

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

	ctx->sample_generator = default_pattern;
	ctx->session_dev_id = cb_data;
	ctx->dev_index = dev_index;
	ctx->samples_counter = 0;

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

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

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

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

	sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
		    40, receive_data, ctx);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* This must to be done between g_thread_init() & g_thread_create(). */
	ctx->timer = g_timer_new();
	thread_running = 1;
	my_thread =
	    g_thread_create((GThreadFunc)thread_func, ctx, 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);
	sr_session_send(ctx->session_dev_id, packet);

	/* Send metadata about the SR_DF_LOGIC packets to come. */
	packet->type = SR_DF_META_LOGIC;
	packet->payload = &meta;
	meta.samplerate = cur_samplerate;
	meta.num_probes = NUM_PROBES;
	sr_session_send(ctx->session_dev_id, packet);

	g_free(header);
	g_free(packet);

	return SR_OK;
}

/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
{
	/* Avoid compiler warnings. */
	(void)dev_index;
	(void)cb_data;

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

	return SR_OK;
}

SR_PRIV struct sr_dev_driver demo_driver_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 "libsigrok.h"
	31	#include "libsigrok-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
	68	struct context {
	69	int pipe_fds[2];
	70	GIOChannel *channels[2];
	71	uint8_t sample_generator;
	72	uint8_t thread_running;
	73	uint64_t samples_counter;
	74	int dev_index;
	75	void *session_dev_id;
	76	GTimer *timer;
	77	};
	78
	79	static const 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 const 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	/* We name the probes 0-7 on our demo driver. */
	106	static const char *probe_names[NUM_PROBES + 1] = {
	107	"0",
	108	"1",
	109	"2",
	110	"3",
	111	"4",
	112	"5",
	113	"6",
	114	"7",
	115	NULL,
	116	};
	117
	118	static uint8_t pattern_sigrok[] = {
	119	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	120	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	121	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	122	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	123	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	124	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	125	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	126	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	127	};
	128
	129	/* Private, per-device-instance driver context. */
	130	/* TODO: struct context as with the other drivers. */
	131
	132	/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
	133	static GSList *dev_insts = NULL;
	134	static uint64_t cur_samplerate = SR_KHZ(200);
	135	static uint64_t limit_samples = 0;
	136	static uint64_t limit_msec = 0;
	137	static int default_pattern = PATTERN_SIGROK;
	138	static GThread *my_thread;
	139	static int thread_running;
	140
	141	static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
	142
	143	static int hw_init(const char *devinfo)
	144	{
	145	struct sr_dev_inst *sdi;
	146
	147	/* Avoid compiler warnings. */
	148	(void)devinfo;
	149
	150	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	151	if (!sdi) {
	152	sr_err("demo: %s: sr_dev_inst_new failed", __func__);
	153	return 0;
	154	}
	155
	156	dev_insts = g_slist_append(dev_insts, sdi);
	157
	158	return 1;
	159	}
	160
	161	static int hw_dev_open(int dev_index)
	162	{
	163	/* Avoid compiler warnings. */
	164	(void)dev_index;
	165
	166	/* Nothing needed so far. */
	167
	168	return SR_OK;
	169	}
	170
	171	static int hw_dev_close(int dev_index)
	172	{
	173	/* Avoid compiler warnings. */
	174	(void)dev_index;
	175
	176	/* Nothing needed so far. */
	177
	178	return SR_OK;
	179	}
	180
	181	static int hw_cleanup(void)
	182	{
	183	/* Nothing needed so far. */
	184	return SR_OK;
	185	}
	186
	187	static const void *hw_dev_info_get(int dev_index, int dev_info_id)
	188	{
	189	struct sr_dev_inst *sdi;
	190	const void *info = NULL;
	191
	192	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
	193	sr_err("demo: %s: sdi was NULL", __func__);
	194	return NULL;
	195	}
	196
	197	switch (dev_info_id) {
	198	case SR_DI_INST:
	199	info = sdi;
	200	break;
	201	case SR_DI_NUM_PROBES:
	202	info = GINT_TO_POINTER(NUM_PROBES);
	203	break;
	204	case SR_DI_PROBE_NAMES:
	205	info = probe_names;
	206	break;
	207	case SR_DI_SAMPLERATES:
	208	info = &samplerates;
	209	break;
	210	case SR_DI_CUR_SAMPLERATE:
	211	info = &cur_samplerate;
	212	break;
	213	case SR_DI_PATTERNS:
	214	info = &pattern_strings;
	215	break;
	216	}
	217
	218	return info;
	219	}
	220
	221	static int hw_dev_status_get(int dev_index)
	222	{
	223	/* Avoid compiler warnings. */
	224	(void)dev_index;
	225
	226	return SR_ST_ACTIVE;
	227	}
	228
	229	static const int *hw_hwcap_get_all(void)
	230	{
	231	return hwcaps;
	232	}
	233
	234	static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
	235	{
	236	int ret;
	237	const char *stropt;
	238
	239	/* Avoid compiler warnings. */
	240	(void)dev_index;
	241
	242	if (hwcap == SR_HWCAP_PROBECONFIG) {
	243	/* Nothing to do, but must be supported */
	244	ret = SR_OK;
	245	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
	246	cur_samplerate = (const uint64_t )value;
	247	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	248	cur_samplerate);
	249	ret = SR_OK;
	250	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	251	limit_msec = 0;
	252	limit_samples = (const uint64_t )value;
	253	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	254	limit_samples);
	255	ret = SR_OK;
	256	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	257	limit_msec = (const uint64_t )value;
	258	limit_samples = 0;
	259	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	260	limit_msec);
	261	ret = SR_OK;
	262	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	263	stropt = value;
	264	ret = SR_OK;
	265	if (!strcmp(stropt, "sigrok")) {
	266	default_pattern = PATTERN_SIGROK;
	267	} else if (!strcmp(stropt, "random")) {
	268	default_pattern = PATTERN_RANDOM;
	269	} else if (!strcmp(stropt, "incremental")) {
	270	default_pattern = PATTERN_INC;
	271	} else if (!strcmp(stropt, "all-low")) {
	272	default_pattern = PATTERN_ALL_LOW;
	273	} else if (!strcmp(stropt, "all-high")) {
	274	default_pattern = PATTERN_ALL_HIGH;
	275	} else {
	276	ret = SR_ERR;
	277	}
	278	sr_dbg("demo: %s: setting pattern to %d", __func__,
	279	default_pattern);
	280	} else {
	281	ret = SR_ERR;
	282	}
	283
	284	return ret;
	285	}
	286
	287	static void samples_generator(uint8_t buf, uint64_t size, void data)
	288	{
	289	static uint64_t p = 0;
	290	struct context *ctx = data;
	291	uint64_t i;
	292
	293	/* TODO: Needed? */
	294	memset(buf, 0, size);
	295
	296	switch (ctx->sample_generator) {
	297	case PATTERN_SIGROK: /* sigrok pattern */
	298	for (i = 0; i < size; i++) {
	299	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	300	if (++p == 64)
	301	p = 0;
	302	}
	303	break;
	304	case PATTERN_RANDOM: /* Random */
	305	for (i = 0; i < size; i++)
	306	*(buf + i) = (uint8_t)(rand() & 0xff);
	307	break;
	308	case PATTERN_INC: /* Simple increment */
	309	for (i = 0; i < size; i++)
	310	*(buf + i) = i;
	311	break;
	312	case PATTERN_ALL_LOW: /* All probes are low */
	313	memset(buf, 0x00, size);
	314	break;
	315	case PATTERN_ALL_HIGH: /* All probes are high */
	316	memset(buf, 0xff, size);
	317	break;
	318	default:
	319	sr_err("demo: %s: unknown pattern %d", __func__,
	320	ctx->sample_generator);
	321	break;
	322	}
	323	}
	324
	325	/* Thread function */
	326	static void thread_func(void *data)
	327	{
	328	struct context *ctx = data;
	329	uint8_t buf[BUFSIZE];
	330	uint64_t nb_to_send = 0;
	331	int bytes_written;
	332	double time_cur, time_last, time_diff;
	333
	334	time_last = g_timer_elapsed(ctx->timer, NULL);
	335
	336	while (thread_running) {
	337	/* Rate control */
	338	time_cur = g_timer_elapsed(ctx->timer, NULL);
	339
	340	time_diff = time_cur - time_last;
	341	time_last = time_cur;
	342
	343	nb_to_send = cur_samplerate * time_diff;
	344
	345	if (limit_samples) {
	346	nb_to_send = MIN(nb_to_send,
	347	limit_samples - ctx->samples_counter);
	348	}
	349
	350	/* Make sure we don't overflow. */
	351	nb_to_send = MIN(nb_to_send, BUFSIZE);
	352
	353	if (nb_to_send) {
	354	samples_generator(buf, nb_to_send, data);
	355	ctx->samples_counter += nb_to_send;
	356
	357	g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
	358	nb_to_send, (gsize *)&bytes_written, NULL);
	359	}
	360
	361	/* Check if we're done. */
	362	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	363	(limit_samples && ctx->samples_counter >= limit_samples))
	364	{
	365	close(ctx->pipe_fds[1]);
	366	thread_running = 0;
	367	}
	368
	369	g_usleep(10);
	370	}
	371	}
	372
	373	/* Callback handling data */
	374	static int receive_data(int fd, int revents, void *cb_data)
	375	{
	376	struct context *ctx = cb_data;
	377	struct sr_datafeed_packet packet;
	378	struct sr_datafeed_logic logic;
	379	static uint64_t samples_received = 0;
	380	unsigned char c[BUFSIZE];
	381	gsize z;
	382
	383	/* Avoid compiler warnings. */
	384	(void)fd;
	385	(void)revents;
	386
	387	do {
	388	g_io_channel_read_chars(ctx->channels[0],
	389	(gchar *)&c, BUFSIZE, &z, NULL);
	390
	391	if (z > 0) {
	392	packet.type = SR_DF_LOGIC;
	393	packet.payload = &logic;
	394	logic.length = z;
	395	logic.unitsize = 1;
	396	logic.data = c;
	397	sr_session_send(ctx->session_dev_id, &packet);
	398	samples_received += z;
	399	}
	400	} while (z > 0);
	401
	402	if (!thread_running && z <= 0) {
	403	/* Make sure we don't receive more packets. */
	404	g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
	405
	406	/* Send last packet. */
	407	packet.type = SR_DF_END;
	408	sr_session_send(ctx->session_dev_id, &packet);
	409
	410	return FALSE;
	411	}
	412
	413	return TRUE;
	414	}
	415
	416	static int hw_dev_acquisition_start(int dev_index, void *cb_data)
	417	{
	418	struct sr_datafeed_packet *packet;
	419	struct sr_datafeed_header *header;
	420	struct sr_datafeed_meta_logic meta;
	421	struct context *ctx;
	422
	423	/* TODO: 'ctx' is never g_free()'d? */
	424	if (!(ctx = g_try_malloc(sizeof(struct context)))) {
	425	sr_err("demo: %s: ctx malloc failed", __func__);
	426	return SR_ERR_MALLOC;
	427	}
	428
	429	ctx->sample_generator = default_pattern;
	430	ctx->session_dev_id = cb_data;
	431	ctx->dev_index = dev_index;
	432	ctx->samples_counter = 0;
	433
	434	if (pipe(ctx->pipe_fds)) {
	435	/* TODO: Better error message. */
	436	sr_err("demo: %s: pipe() failed", __func__);
	437	return SR_ERR;
	438	}
	439
	440	ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
	441	ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
	442
	443	/* Set channel encoding to binary (default is UTF-8). */
	444	g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
	445	g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
	446
	447	/* Make channels to unbuffered. */
	448	g_io_channel_set_buffered(ctx->channels[0], FALSE);
	449	g_io_channel_set_buffered(ctx->channels[1], FALSE);
	450
	451	sr_session_source_add_channel(ctx->channels[0], G_IO_IN \| G_IO_ERR,
	452	40, receive_data, ctx);
	453
	454	/* Run the demo thread. */
	455	g_thread_init(NULL);
	456	/* This must to be done between g_thread_init() & g_thread_create(). */
	457	ctx->timer = g_timer_new();
	458	thread_running = 1;
	459	my_thread =
	460	g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
	461	if (!my_thread) {
	462	sr_err("demo: %s: g_thread_create failed", __func__);
	463	return SR_ERR; /* TODO */
	464	}
	465
	466	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	467	sr_err("demo: %s: packet malloc failed", __func__);
	468	return SR_ERR_MALLOC;
	469	}
	470
	471	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	472	sr_err("demo: %s: header malloc failed", __func__);
	473	return SR_ERR_MALLOC;
	474	}
	475
	476	packet->type = SR_DF_HEADER;
	477	packet->payload = header;
	478	header->feed_version = 1;
	479	gettimeofday(&header->starttime, NULL);
	480	sr_session_send(ctx->session_dev_id, packet);
	481
	482	/* Send metadata about the SR_DF_LOGIC packets to come. */
	483	packet->type = SR_DF_META_LOGIC;
	484	packet->payload = &meta;
	485	meta.samplerate = cur_samplerate;
	486	meta.num_probes = NUM_PROBES;
	487	sr_session_send(ctx->session_dev_id, packet);
	488
	489	g_free(header);
	490	g_free(packet);
	491
	492	return SR_OK;
	493	}
	494
	495	/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
	496	static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
	497	{
	498	/* Avoid compiler warnings. */
	499	(void)dev_index;
	500	(void)cb_data;
	501
	502	/* Stop generate thread. */
	503	thread_running = 0;
	504
	505	return SR_OK;
	506	}
	507
	508	SR_PRIV struct sr_dev_driver demo_driver_info = {
	509	.name = "demo",
	510	.longname = "Demo driver and pattern generator",
	511	.api_version = 1,
	512	.init = hw_init,
	513	.cleanup = hw_cleanup,
	514	.dev_open = hw_dev_open,
	515	.dev_close = hw_dev_close,
	516	.dev_info_get = hw_dev_info_get,
	517	.dev_status_get = hw_dev_status_get,
	518	.hwcap_get_all = hw_hwcap_get_all,
	519	.dev_config_set = hw_dev_config_set,
	520	.dev_acquisition_start = hw_dev_acquisition_start,
	521	.dev_acquisition_stop = hw_dev_acquisition_stop,
	522	};