[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 context {
	int pipe_fds[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 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, 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 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(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 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_send(cb_data, &packet);
			samples_received += z;
		}
	} while (z > 0);

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

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_send(cb_data, &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;
	}

	channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
	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(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(ctx->pipe_fds[0], G_IO_IN | G_IO_ERR, 40,
		      receive_data, ctx->session_dev_id);

	/* 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 "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 context {
	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	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 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, void *value)
	235	{
	236	int ret;
	237	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 = (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_samples = (uint64_t )value;
	252	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	253	limit_samples);
	254	ret = SR_OK;
	255	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	256	limit_msec = (uint64_t )value;
	257	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	258	limit_msec);
	259	ret = SR_OK;
	260	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	261	stropt = value;
	262	ret = SR_OK;
	263	if (!strcmp(stropt, "sigrok")) {
	264	default_pattern = PATTERN_SIGROK;
	265	} else if (!strcmp(stropt, "random")) {
	266	default_pattern = PATTERN_RANDOM;
	267	} else if (!strcmp(stropt, "incremental")) {
	268	default_pattern = PATTERN_INC;
	269	} else if (!strcmp(stropt, "all-low")) {
	270	default_pattern = PATTERN_ALL_LOW;
	271	} else if (!strcmp(stropt, "all-high")) {
	272	default_pattern = PATTERN_ALL_HIGH;
	273	} else {
	274	ret = SR_ERR;
	275	}
	276	sr_dbg("demo: %s: setting pattern to %d", __func__,
	277	default_pattern);
	278	} else {
	279	ret = SR_ERR;
	280	}
	281
	282	return ret;
	283	}
	284
	285	static void samples_generator(uint8_t buf, uint64_t size, void data)
	286	{
	287	static uint64_t p = 0;
	288	struct context *ctx = data;
	289	uint64_t i;
	290
	291	/* TODO: Needed? */
	292	memset(buf, 0, size);
	293
	294	switch (ctx->sample_generator) {
	295	case PATTERN_SIGROK: /* sigrok pattern */
	296	for (i = 0; i < size; i++) {
	297	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	298	if (++p == 64)
	299	p = 0;
	300	}
	301	break;
	302	case PATTERN_RANDOM: /* Random */
	303	for (i = 0; i < size; i++)
	304	*(buf + i) = (uint8_t)(rand() & 0xff);
	305	break;
	306	case PATTERN_INC: /* Simple increment */
	307	for (i = 0; i < size; i++)
	308	*(buf + i) = i;
	309	break;
	310	case PATTERN_ALL_LOW: /* All probes are low */
	311	memset(buf, 0x00, size);
	312	break;
	313	case PATTERN_ALL_HIGH: /* All probes are high */
	314	memset(buf, 0xff, size);
	315	break;
	316	default:
	317	sr_err("demo: %s: unknown pattern %d", __func__,
	318	ctx->sample_generator);
	319	break;
	320	}
	321	}
	322
	323	/* Thread function */
	324	static void thread_func(void *data)
	325	{
	326	struct context *ctx = data;
	327	uint8_t buf[BUFSIZE];
	328	uint64_t nb_to_send = 0;
	329	int bytes_written;
	330	double time_cur, time_last, time_diff;
	331
	332	time_last = g_timer_elapsed(ctx->timer, NULL);
	333
	334	while (thread_running) {
	335	/* Rate control */
	336	time_cur = g_timer_elapsed(ctx->timer, NULL);
	337
	338	time_diff = time_cur - time_last;
	339	time_last = time_cur;
	340
	341	nb_to_send = cur_samplerate * time_diff;
	342
	343	if (limit_samples) {
	344	nb_to_send = MIN(nb_to_send,
	345	limit_samples - ctx->samples_counter);
	346	}
	347
	348	/* Make sure we don't overflow. */
	349	nb_to_send = MIN(nb_to_send, BUFSIZE);
	350
	351	if (nb_to_send) {
	352	samples_generator(buf, nb_to_send, data);
	353	ctx->samples_counter += nb_to_send;
	354
	355	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	356	nb_to_send, (gsize *)&bytes_written, NULL);
	357	}
	358
	359	/* Check if we're done. */
	360	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	361	(limit_samples && ctx->samples_counter >= limit_samples))
	362	{
	363	close(ctx->pipe_fds[1]);
	364	thread_running = 0;
	365	}
	366
	367	g_usleep(10);
	368	}
	369	}
	370
	371	/* Callback handling data */
	372	static int receive_data(int fd, int revents, void *cb_data)
	373	{
	374	struct sr_datafeed_packet packet;
	375	struct sr_datafeed_logic logic;
	376	static uint64_t samples_received = 0;
	377	unsigned char c[BUFSIZE];
	378	gsize z;
	379
	380	/* Avoid compiler warnings. */
	381	(void)fd;
	382	(void)revents;
	383
	384	do {
	385	g_io_channel_read_chars(channels[0],
	386	(gchar *)&c, BUFSIZE, &z, NULL);
	387
	388	if (z > 0) {
	389	packet.type = SR_DF_LOGIC;
	390	packet.payload = &logic;
	391	logic.length = z;
	392	logic.unitsize = 1;
	393	logic.data = c;
	394	sr_session_send(cb_data, &packet);
	395	samples_received += z;
	396	}
	397	} while (z > 0);
	398
	399	if (!thread_running && z <= 0) {
	400	/* Make sure we don't receive more packets. */
	401	g_io_channel_shutdown(channels[0], FALSE, NULL);
	402
	403	/* Send last packet. */
	404	packet.type = SR_DF_END;
	405	sr_session_send(cb_data, &packet);
	406
	407	return FALSE;
	408	}
	409
	410	return TRUE;
	411	}
	412
	413	static int hw_dev_acquisition_start(int dev_index, void *cb_data)
	414	{
	415	struct sr_datafeed_packet *packet;
	416	struct sr_datafeed_header *header;
	417	struct sr_datafeed_meta_logic meta;
	418	struct context *ctx;
	419
	420	/* TODO: 'ctx' is never g_free()'d? */
	421	if (!(ctx = g_try_malloc(sizeof(struct context)))) {
	422	sr_err("demo: %s: ctx malloc failed", __func__);
	423	return SR_ERR_MALLOC;
	424	}
	425
	426	ctx->sample_generator = default_pattern;
	427	ctx->session_dev_id = cb_data;
	428	ctx->dev_index = dev_index;
	429	ctx->samples_counter = 0;
	430
	431	if (pipe(ctx->pipe_fds)) {
	432	/* TODO: Better error message. */
	433	sr_err("demo: %s: pipe() failed", __func__);
	434	return SR_ERR;
	435	}
	436
	437	channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
	438	channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
	439
	440	/* Set channel encoding to binary (default is UTF-8). */
	441	g_io_channel_set_encoding(channels[0], NULL, NULL);
	442	g_io_channel_set_encoding(channels[1], NULL, NULL);
	443
	444	/* Make channels to unbuffered. */
	445	g_io_channel_set_buffered(channels[0], FALSE);
	446	g_io_channel_set_buffered(channels[1], FALSE);
	447
	448	sr_source_add(ctx->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	449	receive_data, ctx->session_dev_id);
	450
	451	/* Run the demo thread. */
	452	g_thread_init(NULL);
	453	/* This must to be done between g_thread_init() & g_thread_create(). */
	454	ctx->timer = g_timer_new();
	455	thread_running = 1;
	456	my_thread =
	457	g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
	458	if (!my_thread) {
	459	sr_err("demo: %s: g_thread_create failed", __func__);
	460	return SR_ERR; /* TODO */
	461	}
	462
	463	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	464	sr_err("demo: %s: packet malloc failed", __func__);
	465	return SR_ERR_MALLOC;
	466	}
	467
	468	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	469	sr_err("demo: %s: header malloc failed", __func__);
	470	return SR_ERR_MALLOC;
	471	}
	472
	473	packet->type = SR_DF_HEADER;
	474	packet->payload = header;
	475	header->feed_version = 1;
	476	gettimeofday(&header->starttime, NULL);
	477	sr_session_send(ctx->session_dev_id, packet);
	478
	479	/* Send metadata about the SR_DF_LOGIC packets to come. */
	480	packet->type = SR_DF_META_LOGIC;
	481	packet->payload = &meta;
	482	meta.samplerate = cur_samplerate;
	483	meta.num_probes = NUM_PROBES;
	484	sr_session_send(ctx->session_dev_id, packet);
	485
	486	g_free(header);
	487	g_free(packet);
	488
	489	return SR_OK;
	490	}
	491
	492	/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
	493	static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
	494	{
	495	/* Avoid compiler warnings. */
	496	(void)dev_index;
	497	(void)cb_data;
	498
	499	/* Stop generate thread. */
	500	thread_running = 0;
	501
	502	return SR_OK;
	503	}
	504
	505	SR_PRIV struct sr_dev_driver demo_driver_info = {
	506	.name = "demo",
	507	.longname = "Demo driver and pattern generator",
	508	.api_version = 1,
	509	.init = hw_init,
	510	.cleanup = hw_cleanup,
	511	.dev_open = hw_dev_open,
	512	.dev_close = hw_dev_close,
	513	.dev_info_get = hw_dev_info_get,
	514	.dev_status_get = hw_dev_status_get,
	515	.hwcap_get_all = hw_hwcap_get_all,
	516	.dev_config_set = hw_dev_config_set,
	517	.dev_acquisition_start = hw_dev_acquisition_start,
	518	.dev_acquisition_stop = hw_dev_acquisition_stop,
	519	};