libsigrok/hardware/demo/demo.c

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/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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* 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.
*/
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PATTERN_SIGROK,
/** Pattern which consists of (pseudo-)random values on all probes. */
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PATTERN_RANDOM,
/**
* Pattern which consists of incrementing numbers.
* TODO: Better description.
*/
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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,
};
/* Private, per-device-instance driver context. */
struct dev_context {
int pipe_fds[2];
GIOChannel *channels[2];
uint8_t sample_generator;
uint8_t thread_running;
uint64_t samples_counter;
void *session_dev_id;
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GTimer *timer;
};
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static const int hwcaps[] = {
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SR_HWCAP_LOGIC_ANALYZER,
SR_HWCAP_DEMO_DEV,
SR_HWCAP_SAMPLERATE,
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SR_HWCAP_PATTERN_MODE,
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_LIMIT_MSEC,
SR_HWCAP_CONTINUOUS,
};
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static const struct sr_samplerates samplerates = {
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SR_HZ(1),
SR_GHZ(1),
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SR_HZ(1),
NULL,
};
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static const char *pattern_strings[] = {
"sigrok",
"random",
"incremental",
"all-low",
"all-high",
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NULL,
};
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/* 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,
};
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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(). */
SR_PRIV struct sr_dev_driver demo_driver_info;
static struct sr_dev_driver *ddi = &demo_driver_info;
static uint64_t cur_samplerate = SR_KHZ(200);
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static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
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static int default_pattern = PATTERN_SIGROK;
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static GThread *my_thread;
static int thread_running;
static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
void *cb_data);
static int hw_init(void)
{
struct drv_context *drvc;
if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
sr_err("fx2lafw: driver context malloc failed.");
return SR_ERR;
}
ddi->priv = drvc;
return SR_OK;
}
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static GSList *hw_scan(GSList *options)
{
struct sr_dev_inst *sdi;
struct sr_probe *probe;
struct drv_context *drvc;
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GSList *devices;
int i;
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(void)options;
drvc = ddi->priv;
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devices = NULL;
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;
}
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sdi->driver = ddi;
for (i = 0; probe_names[i]; i++) {
if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
probe_names[i])))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
}
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devices = g_slist_append(devices, sdi);
drvc->instances = g_slist_append(drvc->instances, sdi);
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return devices;
}
static GSList *hw_dev_list(void)
{
struct drv_context *drvc;
drvc = ddi->priv;
return drvc->instances;
}
static int hw_dev_open(struct sr_dev_inst *sdi)
{
/* Avoid compiler warnings. */
(void)sdi;
/* Nothing needed so far. */
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return SR_OK;
}
static int hw_dev_close(struct sr_dev_inst *sdi)
{
/* Avoid compiler warnings. */
(void)sdi;
/* Nothing needed so far. */
return SR_OK;
}
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static int hw_cleanup(void)
{
/* Nothing needed so far. */
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return SR_OK;
}
static int hw_info_get(int info_id, const void **data,
const struct sr_dev_inst *sdi)
{
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(void)sdi;
switch (info_id) {
case SR_DI_HWCAPS:
*data = hwcaps;
break;
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case SR_DI_NUM_PROBES:
*data = GINT_TO_POINTER(NUM_PROBES);
break;
case SR_DI_PROBE_NAMES:
*data = probe_names;
break;
case SR_DI_SAMPLERATES:
*data = &samplerates;
break;
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case SR_DI_CUR_SAMPLERATE:
*data = &cur_samplerate;
break;
case SR_DI_PATTERNS:
*data = &pattern_strings;
break;
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default:
return SR_ERR_ARG;
}
return SR_OK;
}
static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
const void *value)
{
int ret;
const char *stropt;
(void)sdi;
if (hwcap == SR_HWCAP_SAMPLERATE) {
cur_samplerate = *(const uint64_t *)value;
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sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
cur_samplerate);
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ret = SR_OK;
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} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
limit_msec = 0;
limit_samples = *(const uint64_t *)value;
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sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
limit_samples);
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ret = SR_OK;
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} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
limit_msec = *(const uint64_t *)value;
limit_samples = 0;
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sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
limit_msec);
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ret = SR_OK;
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} 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")) {
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default_pattern = PATTERN_RANDOM;
} else if (!strcmp(stropt, "incremental")) {
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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 {
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ret = SR_ERR;
}
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sr_dbg("demo: %s: setting pattern to %d", __func__,
default_pattern);
} else {
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ret = SR_ERR;
}
return ret;
}
static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
static uint64_t p = 0;
struct dev_context *devc = data;
uint64_t i;
/* TODO: Needed? */
memset(buf, 0, size);
switch (devc->sample_generator) {
case PATTERN_SIGROK: /* sigrok pattern */
for (i = 0; i < size; i++) {
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*(buf + i) = ~(pattern_sigrok[p] >> 1);
if (++p == 64)
p = 0;
}
break;
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case PATTERN_RANDOM: /* Random */
for (i = 0; i < size; i++)
*(buf + i) = (uint8_t)(rand() & 0xff);
break;
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case PATTERN_INC: /* Simple increment */
for (i = 0; i < size; i++)
*(buf + i) = i;
break;
case PATTERN_ALL_LOW: /* All probes are low */
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memset(buf, 0x00, size);
break;
case PATTERN_ALL_HIGH: /* All probes are high */
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memset(buf, 0xff, size);
break;
default:
sr_err("demo: %s: unknown pattern %d", __func__,
devc->sample_generator);
break;
}
}
/* Thread function */
static void thread_func(void *data)
{
struct dev_context *devc = 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(devc->timer, NULL);
while (thread_running) {
/* Rate control */
time_cur = g_timer_elapsed(devc->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 - devc->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);
devc->samples_counter += nb_to_send;
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g_io_channel_write_chars(devc->channels[1], (gchar *)&buf,
nb_to_send, (gsize *)&bytes_written, NULL);
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}
/* Check if we're done. */
if ((limit_msec && time_cur * 1000 > limit_msec) ||
(limit_samples && devc->samples_counter >= limit_samples))
{
close(devc->pipe_fds[1]);
thread_running = 0;
}
g_usleep(10);
}
}
/* Callback handling data */
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static int receive_data(int fd, int revents, void *cb_data)
{
struct dev_context *devc = cb_data;
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struct sr_datafeed_packet packet;
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struct sr_datafeed_logic logic;
static uint64_t samples_received = 0;
unsigned char c[BUFSIZE];
gsize z;
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/* Avoid compiler warnings. */
(void)fd;
(void)revents;
do {
g_io_channel_read_chars(devc->channels[0],
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(gchar *)&c, BUFSIZE, &z, NULL);
if (z > 0) {
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packet.type = SR_DF_LOGIC;
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packet.payload = &logic;
logic.length = z;
logic.unitsize = 1;
logic.data = c;
sr_session_send(devc->session_dev_id, &packet);
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samples_received += z;
}
} while (z > 0);
if (!thread_running && z <= 0) {
/* Make sure we don't receive more packets. */
g_io_channel_shutdown(devc->channels[0], FALSE, NULL);
/* Send last packet. */
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packet.type = SR_DF_END;
sr_session_send(devc->session_dev_id, &packet);
return FALSE;
}
return TRUE;
}
static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
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struct sr_datafeed_packet *packet;
struct sr_datafeed_header *header;
struct sr_datafeed_meta_logic meta;
struct dev_context *devc;
(void)sdi;
/* TODO: 'devc' is never g_free()'d? */
if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
sr_err("demo: %s: devc malloc failed", __func__);
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return SR_ERR_MALLOC;
}
devc->sample_generator = default_pattern;
devc->session_dev_id = cb_data;
devc->samples_counter = 0;
if (pipe(devc->pipe_fds)) {
/* TODO: Better error message. */
sr_err("demo: %s: pipe() failed", __func__);
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return SR_ERR;
}
devc->channels[0] = g_io_channel_unix_new(devc->pipe_fds[0]);
devc->channels[1] = g_io_channel_unix_new(devc->pipe_fds[1]);
g_io_channel_set_flags(devc->channels[0], G_IO_FLAG_NONBLOCK, NULL);
/* Set channel encoding to binary (default is UTF-8). */
g_io_channel_set_encoding(devc->channels[0], NULL, NULL);
g_io_channel_set_encoding(devc->channels[1], NULL, NULL);
/* Make channels to unbuffered. */
g_io_channel_set_buffered(devc->channels[0], FALSE);
g_io_channel_set_buffered(devc->channels[1], FALSE);
sr_session_source_add_channel(devc->channels[0], G_IO_IN | G_IO_ERR,
40, receive_data, devc);
/* Run the demo thread. */
g_thread_init(NULL);
/* This must to be done between g_thread_init() & g_thread_create(). */
devc->timer = g_timer_new();
thread_running = 1;
my_thread =
g_thread_create((GThreadFunc)thread_func, devc, 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__);
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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;
}
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packet->type = SR_DF_HEADER;
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packet->payload = header;
header->feed_version = 1;
gettimeofday(&header->starttime, NULL);
sr_session_send(devc->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(devc->session_dev_id, packet);
g_free(header);
g_free(packet);
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return SR_OK;
}
static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct dev_context *devc;
/* Avoid compiler warnings. */
(void)cb_data;
devc = sdi->priv;
/* Stop generate thread. */
thread_running = 0;
sr_session_source_remove_channel(devc->channels[0]);
return SR_OK;
}
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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,
.scan = hw_scan,
.dev_list = hw_dev_list,
.dev_open = hw_dev_open,
.dev_close = hw_dev_close,
.info_get = hw_info_get,
.dev_config_set = hw_dev_config_set,
.dev_acquisition_start = hw_dev_acquisition_start,
.dev_acquisition_stop = hw_dev_acquisition_stop,
.priv = NULL,
};