libsigrok/hardware/demo/demo.c

501 lines
12 KiB
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>
* 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 driver-specific prefix string. */
#define DRIVER_LOG_DOMAIN "demo: "
#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN 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
/* 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 {
int pipe_fds[2];
GIOChannel *channels[2];
uint8_t sample_generator;
uint64_t samples_counter;
void *session_dev_id;
int64_t starttime;
};
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(). */
SR_PRIV struct sr_dev_driver demo_driver_info;
static struct sr_dev_driver *di = &demo_driver_info;
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 int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
static int clear_instances(void)
{
/* Nothing needed so far. */
return SR_OK;
}
static int hw_init(struct sr_context *sr_ctx)
{
struct drv_context *drvc;
if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
sr_err("Driver context malloc failed.");
return SR_ERR_MALLOC;
}
drvc->sr_ctx = sr_ctx;
di->priv = drvc;
return SR_OK;
}
static GSList *hw_scan(GSList *options)
{
struct sr_dev_inst *sdi;
struct sr_probe *probe;
struct drv_context *drvc;
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("%s: sr_dev_inst_new failed", __func__);
return 0;
}
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);
return devices;
}
static GSList *hw_dev_list(void)
{
struct drv_context *drvc;
drvc = di->priv;
return drvc->instances;
}
static int hw_dev_open(struct sr_dev_inst *sdi)
{
(void)sdi;
/* Nothing needed so far. */
return SR_OK;
}
static int hw_dev_close(struct sr_dev_inst *sdi)
{
(void)sdi;
/* Nothing needed so far. */
return SR_OK;
}
static int hw_cleanup(void)
{
/* Nothing needed so far. */
return SR_OK;
}
static int hw_info_get(int info_id, const void **data,
const struct sr_dev_inst *sdi)
{
(void)sdi;
switch (info_id) {
case SR_DI_HWCAPS:
*data = hwcaps;
break;
case SR_DI_SAMPLERATES:
*data = &samplerates;
break;
case SR_DI_CUR_SAMPLERATE:
*data = &cur_samplerate;
break;
case SR_DI_PATTERNS:
*data = &pattern_strings;
break;
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;
sr_dbg("%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("%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("%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("%s: setting pattern to %d", __func__, default_pattern);
} else {
ret = SR_ERR;
}
return ret;
}
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] >> 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("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 * cur_samplerate / 1000000;
/* Of those, how many do we still have to send? */
samples_to_send = expected_samplenum - devc->samples_counter;
if (limit_samples) {
samples_to_send = MIN(samples_to_send,
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->session_dev_id, &packet);
devc->samples_counter += sending_now;
}
if (limit_samples && devc->samples_counter >= limit_samples) {
sr_info("Requested number of samples reached.");
hw_dev_acquisition_stop(NULL, cb_data);
return TRUE;
}
return TRUE;
}
static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct sr_datafeed_packet *packet;
struct sr_datafeed_header *header;
struct dev_context *devc;
(void)sdi;
sr_dbg("Starting acquisition.");
/* TODO: 'devc' is never g_free()'d? */
if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
sr_err("%s: devc malloc failed", __func__);
return SR_ERR_MALLOC;
}
devc->sample_generator = default_pattern;
devc->session_dev_id = 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->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);
if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
sr_err("%s: packet malloc failed", __func__);
return SR_ERR_MALLOC;
}
if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
sr_err("%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(devc->session_dev_id, packet);
/* We use this timestamp to decide how many more samples to send. */
devc->starttime = g_get_monotonic_time();
g_free(header);
g_free(packet);
return SR_OK;
}
static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
(void)sdi;
devc = cb_data;
sr_dbg("Stopping aquisition.");
sr_session_source_remove_channel(devc->channels[0]);
g_io_channel_shutdown(devc->channels[0], FALSE, NULL);
/* Send last packet. */
packet.type = SR_DF_END;
sr_session_send(devc->session_dev_id, &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 = hw_init,
.cleanup = hw_cleanup,
.scan = hw_scan,
.dev_list = hw_dev_list,
.dev_clear = clear_instances,
.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,
};