libsigrok/hardware/demo/demo.c

525 lines
13 KiB
C

/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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"
/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "demo: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
/* 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
#define STR_PATTERN_SIGROK "sigrok"
#define STR_PATTERN_RANDOM "random"
#define STR_PATTERN_INC "incremental"
#define STR_PATTERN_ALL_LOW "all-low"
#define STR_PATTERN_ALL_HIGH "all-high"
/* 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,
};
/* Private, per-device-instance driver context. */
struct dev_context {
struct sr_dev_inst *sdi;
int pipe_fds[2];
GIOChannel *channel;
uint64_t cur_samplerate;
uint64_t limit_samples;
uint64_t limit_msec;
uint8_t sample_generator;
uint64_t samples_counter;
void *cb_data;
int64_t starttime;
};
static const int hwcaps[] = {
SR_CONF_LOGIC_ANALYZER,
SR_CONF_DEMO_DEV,
SR_CONF_SAMPLERATE,
SR_CONF_PATTERN_MODE,
SR_CONF_LIMIT_SAMPLES,
SR_CONF_LIMIT_MSEC,
SR_CONF_CONTINUOUS,
};
static const uint64_t samplerates[] = {
SR_HZ(1),
SR_GHZ(1),
SR_HZ(1),
};
static const char *pattern_strings[] = {
"sigrok",
"random",
"incremental",
"all-low",
"all-high",
};
/* 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(). */
SR_PRIV struct sr_dev_driver demo_driver_info;
static struct sr_dev_driver *di = &demo_driver_info;
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
static int dev_clear(void)
{
return std_dev_clear(di, NULL);
}
static int init(struct sr_context *sr_ctx)
{
return std_init(sr_ctx, di, LOG_PREFIX);
}
static GSList *scan(GSList *options)
{
struct sr_dev_inst *sdi;
struct sr_probe *probe;
struct drv_context *drvc;
struct dev_context *devc;
GSList *devices;
int i;
(void)options;
drvc = di->priv;
devices = NULL;
sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
if (!sdi) {
sr_err("Device instance creation failed.");
return NULL;
}
sdi->driver = di;
for (i = 0; probe_names[i]; i++) {
if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
probe_names[i])))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
}
devices = g_slist_append(devices, sdi);
drvc->instances = g_slist_append(drvc->instances, sdi);
if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
sr_err("Device context malloc failed.");
return NULL;
}
devc->sdi = sdi;
devc->cur_samplerate = SR_KHZ(200);
devc->limit_samples = 0;
devc->limit_msec = 0;
devc->sample_generator = PATTERN_SIGROK;
sdi->priv = devc;
return devices;
}
static GSList *dev_list(void)
{
return ((struct drv_context *)(di->priv))->instances;
}
static int dev_open(struct sr_dev_inst *sdi)
{
sdi->status = SR_ST_ACTIVE;
return SR_OK;
}
static int dev_close(struct sr_dev_inst *sdi)
{
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int cleanup(void)
{
return dev_clear();
}
static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
struct dev_context *const devc = sdi->priv;
(void)probe_group;
switch (id) {
case SR_CONF_SAMPLERATE:
*data = g_variant_new_uint64(devc->cur_samplerate);
break;
case SR_CONF_LIMIT_SAMPLES:
*data = g_variant_new_uint64(devc->limit_samples);
break;
case SR_CONF_LIMIT_MSEC:
*data = g_variant_new_uint64(devc->limit_msec);
break;
case SR_CONF_PATTERN_MODE:
switch (devc->sample_generator) {
case PATTERN_SIGROK:
*data = g_variant_new_string(STR_PATTERN_SIGROK);
break;
case PATTERN_RANDOM:
*data = g_variant_new_string(STR_PATTERN_RANDOM);
break;
case PATTERN_INC:
*data = g_variant_new_string(STR_PATTERN_INC);
break;
case PATTERN_ALL_LOW:
*data = g_variant_new_string(STR_PATTERN_ALL_LOW);
break;
case PATTERN_ALL_HIGH:
*data = g_variant_new_string(STR_PATTERN_ALL_HIGH);
break;
}
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
int ret;
const char *stropt;
(void)probe_group;
struct dev_context *const devc = sdi->priv;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (id == SR_CONF_SAMPLERATE) {
devc->cur_samplerate = g_variant_get_uint64(data);
sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
devc->cur_samplerate);
ret = SR_OK;
} else if (id == SR_CONF_LIMIT_SAMPLES) {
devc->limit_msec = 0;
devc->limit_samples = g_variant_get_uint64(data);
sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
devc->limit_samples);
ret = SR_OK;
} else if (id == SR_CONF_LIMIT_MSEC) {
devc->limit_msec = g_variant_get_uint64(data);
devc->limit_samples = 0;
sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
devc->limit_msec);
ret = SR_OK;
} else if (id == SR_CONF_PATTERN_MODE) {
stropt = g_variant_get_string(data, NULL);
ret = SR_OK;
if (!strcmp(stropt, STR_PATTERN_SIGROK)) {
devc->sample_generator = PATTERN_SIGROK;
} else if (!strcmp(stropt, STR_PATTERN_RANDOM)) {
devc->sample_generator = PATTERN_RANDOM;
} else if (!strcmp(stropt, STR_PATTERN_INC)) {
devc->sample_generator = PATTERN_INC;
} else if (!strcmp(stropt, STR_PATTERN_ALL_LOW)) {
devc->sample_generator = PATTERN_ALL_LOW;
} else if (!strcmp(stropt, STR_PATTERN_ALL_HIGH)) {
devc->sample_generator = PATTERN_ALL_HIGH;
} else {
ret = SR_ERR;
}
sr_dbg("%s: setting pattern to %d",
__func__, devc->sample_generator);
} else {
ret = SR_ERR_NA;
}
return ret;
}
static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
GVariant *gvar;
GVariantBuilder gvb;
(void)sdi;
(void)probe_group;
switch (key) {
case SR_CONF_DEVICE_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
break;
case SR_CONF_SAMPLERATE:
g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
ARRAY_SIZE(samplerates), sizeof(uint64_t));
g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
*data = g_variant_builder_end(&gvb);
break;
case SR_CONF_PATTERN_MODE:
*data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings));
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static void samples_generator(uint8_t *buf, uint64_t size,
struct dev_context *devc)
{
static uint64_t p = 0;
uint64_t i;
/* TODO: Needed? */
memset(buf, 0, size);
switch (devc->sample_generator) {
case PATTERN_SIGROK: /* sigrok pattern */
for (i = 0; i < size; i++) {
*(buf + i) = ~(pattern_sigrok[
p++ % sizeof(pattern_sigrok)] >> 1);
}
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) = p++;
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("Unknown pattern: %d.", devc->sample_generator);
break;
}
}
/* Callback handling data */
static int receive_data(int fd, int revents, void *cb_data)
{
struct dev_context *devc = cb_data;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
uint8_t buf[BUFSIZE];
static uint64_t samples_to_send, expected_samplenum, sending_now;
int64_t time, elapsed;
(void)fd;
(void)revents;
/* How many "virtual" samples should we have collected by now? */
time = g_get_monotonic_time();
elapsed = time - devc->starttime;
expected_samplenum = elapsed * devc->cur_samplerate / 1000000;
/* Of those, how many do we still have to send? */
samples_to_send = expected_samplenum - devc->samples_counter;
if (devc->limit_samples) {
samples_to_send = MIN(samples_to_send,
devc->limit_samples - devc->samples_counter);
}
while (samples_to_send > 0) {
sending_now = MIN(samples_to_send, sizeof(buf));
samples_to_send -= sending_now;
samples_generator(buf, sending_now, devc);
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.length = sending_now;
logic.unitsize = 1;
logic.data = buf;
sr_session_send(devc->cb_data, &packet);
devc->samples_counter += sending_now;
}
if (devc->limit_samples &&
devc->samples_counter >= devc->limit_samples) {
sr_info("Requested number of samples reached.");
dev_acquisition_stop(devc->sdi, cb_data);
return TRUE;
}
return TRUE;
}
static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *const devc = sdi->priv;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
devc->cb_data = cb_data;
devc->samples_counter = 0;
/*
* Setting two channels connected by a pipe is a remnant from when the
* demo driver generated data in a thread, and collected and sent the
* data in the main program loop.
* They are kept here because it provides a convenient way of setting
* up a timeout-based polling mechanism.
*/
if (pipe(devc->pipe_fds)) {
/* TODO: Better error message. */
sr_err("%s: pipe() failed", __func__);
return SR_ERR;
}
devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
/* Set channel encoding to binary (default is UTF-8). */
g_io_channel_set_encoding(devc->channel, NULL, NULL);
/* Make channels to unbuffered. */
g_io_channel_set_buffered(devc->channel, FALSE);
sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR,
40, receive_data, devc);
/* Send header packet to the session bus. */
std_session_send_df_header(cb_data, LOG_PREFIX);
/* We use this timestamp to decide how many more samples to send. */
devc->starttime = g_get_monotonic_time();
return SR_OK;
}
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *const devc = sdi->priv;
struct sr_datafeed_packet packet;
(void)cb_data;
sr_dbg("Stopping aquisition.");
sr_session_source_remove_channel(devc->channel);
g_io_channel_shutdown(devc->channel, FALSE, NULL);
g_io_channel_unref(devc->channel);
devc->channel = NULL;
/* Send last packet. */
packet.type = SR_DF_END;
sr_session_send(devc->cb_data, &packet);
return SR_OK;
}
SR_PRIV struct sr_dev_driver demo_driver_info = {
.name = "demo",
.longname = "Demo driver and pattern generator",
.api_version = 1,
.init = init,
.cleanup = cleanup,
.scan = scan,
.dev_list = dev_list,
.dev_clear = dev_clear,
.config_get = config_get,
.config_set = config_set,
.config_list = config_list,
.dev_open = dev_open,
.dev_close = dev_close,
.dev_acquisition_start = dev_acquisition_start,
.dev_acquisition_stop = dev_acquisition_stop,
.priv = NULL,
};