* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <config.h>
#include <stdlib.h>
-#include <unistd.h>
#include <string.h>
#include <math.h>
-#ifdef _WIN32
-#include <io.h>
-#include <fcntl.h>
-#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
-#endif
-#include "libsigrok.h"
+#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#define LOG_PREFIX "demo"
/* Size of the analog pattern space per channel. */
#define ANALOG_BUFSIZE 4096
-#define DEFAULT_ANALOG_AMPLITUDE 25
+#define DEFAULT_ANALOG_AMPLITUDE 10
#define ANALOG_SAMPLES_PER_PERIOD 20
/* Logic patterns we can generate. */
float amplitude;
float pattern_data[ANALOG_BUFSIZE];
unsigned int num_samples;
- struct sr_datafeed_analog packet;
+ struct sr_datafeed_analog_old packet;
float avg_val; /* Average value */
unsigned num_avgs; /* Number of samples averaged */
};
/* Private, per-device-instance driver context. */
struct dev_context {
- int pipe_fds[2];
- GIOChannel *channel;
uint64_t cur_samplerate;
- gboolean continuous;
uint64_t limit_samples;
uint64_t limit_msec;
- uint64_t logic_counter;
- uint64_t analog_counter;
- int64_t starttime;
+ uint64_t sent_samples;
+ int64_t start_us;
+ int64_t spent_us;
uint64_t step;
/* Logic */
int32_t num_logic_channels;
};
static const uint32_t devopts[] = {
- SR_CONF_CONTINUOUS | SR_CONF_SET,
+ SR_CONF_CONTINUOUS,
SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
};
-static const uint32_t devopts_cg_analog[] = {
+static const uint32_t devopts_cg_analog_group[] = {
+ SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
+};
+
+static const uint32_t devopts_cg_analog_channel[] = {
SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
};
0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
-SR_PRIV struct sr_dev_driver demo_driver_info;
-
-static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
-
-static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
-{
- return std_init(sr_ctx, di, LOG_PREFIX);
-}
+static int dev_acquisition_stop(struct sr_dev_inst *sdi);
static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
{
for (i = 0; i < num_samples; i++) {
t = (double) i / (double) sample_rate;
ag->pattern_data[i] = ag->amplitude *
- sin(2 * PI * frequency * t);
+ sin(2 * G_PI * frequency * t);
}
ag->num_samples = num_samples;
for (i = 0; i < num_samples; i++) {
t = (double) i / (double) sample_rate;
- ag->pattern_data[i] = (2 * ag->amplitude / PI) *
- asin(sin(2 * PI * frequency * t));
+ ag->pattern_data[i] = (2 * ag->amplitude / G_PI) *
+ asin(sin(2 * G_PI * frequency * t));
}
ag->num_samples = num_samples;
int num_logic_channels, num_analog_channels, pattern, i;
char channel_name[16];
- drvc = di->priv;
+ drvc = di->context;
num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
devices = NULL;
sdi = g_malloc0(sizeof(struct sr_dev_inst));
- sdi->status = SR_ST_ACTIVE;
+ sdi->status = SR_ST_INACTIVE;
sdi->model = g_strdup("Demo device");
sdi->driver = di;
- devc = g_malloc(sizeof(struct dev_context));
+ devc = g_malloc0(sizeof(struct dev_context));
devc->cur_samplerate = SR_KHZ(200);
- devc->limit_samples = 0;
- devc->limit_msec = 0;
- devc->step = 0;
- devc->continuous = FALSE;
devc->num_logic_channels = num_logic_channels;
devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
devc->logic_pattern = PATTERN_SIGROK;
devc->num_analog_channels = num_analog_channels;
- devc->avg = FALSE;
- devc->avg_samples = 0;
-
- /* Logic channels, all in one channel group. */
- cg = g_malloc0(sizeof(struct sr_channel_group));
- cg->name = g_strdup("Logic");
- for (i = 0; i < num_logic_channels; i++) {
- sprintf(channel_name, "D%d", i);
- ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
- cg->channels = g_slist_append(cg->channels, ch);
- }
- sdi->channel_groups = g_slist_append(NULL, cg);
- /* Analog channels, channel groups and pattern generators. */
- pattern = 0;
- /* An "Analog" channel group with all analog channels in it. */
- acg = g_malloc0(sizeof(struct sr_channel_group));
- acg->name = g_strdup("Analog");
- sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
-
- devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
- for (i = 0; i < num_analog_channels; i++) {
- snprintf(channel_name, 16, "A%d", i);
- ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
- TRUE, channel_name);
- acg->channels = g_slist_append(acg->channels, ch);
-
- /* Every analog channel gets its own channel group as well. */
+ if (num_logic_channels > 0) {
+ /* Logic channels, all in one channel group. */
cg = g_malloc0(sizeof(struct sr_channel_group));
- cg->name = g_strdup(channel_name);
- cg->channels = g_slist_append(NULL, ch);
- sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
-
- /* Every channel gets a generator struct. */
- ag = g_malloc(sizeof(struct analog_gen));
- ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
- ag->packet.channels = cg->channels;
- ag->packet.mq = 0;
- ag->packet.mqflags = 0;
- ag->packet.unit = SR_UNIT_VOLT;
- ag->packet.data = ag->pattern_data;
- ag->pattern = pattern;
- ag->avg_val = 0.0f;
- ag->num_avgs = 0;
- g_hash_table_insert(devc->ch_ag, ch, ag);
+ cg->name = g_strdup("Logic");
+ for (i = 0; i < num_logic_channels; i++) {
+ sprintf(channel_name, "D%d", i);
+ ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
+ cg->channels = g_slist_append(cg->channels, ch);
+ }
+ sdi->channel_groups = g_slist_append(NULL, cg);
+ }
- if (++pattern == ARRAY_SIZE(analog_pattern_str))
- pattern = 0;
+ /* Analog channels, channel groups and pattern generators. */
+ if (num_analog_channels > 0) {
+ pattern = 0;
+ /* An "Analog" channel group with all analog channels in it. */
+ acg = g_malloc0(sizeof(struct sr_channel_group));
+ acg->name = g_strdup("Analog");
+ sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
+
+ devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
+ for (i = 0; i < num_analog_channels; i++) {
+ snprintf(channel_name, 16, "A%d", i);
+ ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
+ TRUE, channel_name);
+ acg->channels = g_slist_append(acg->channels, ch);
+
+ /* Every analog channel gets its own channel group as well. */
+ cg = g_malloc0(sizeof(struct sr_channel_group));
+ cg->name = g_strdup(channel_name);
+ cg->channels = g_slist_append(NULL, ch);
+ sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
+
+ /* Every channel gets a generator struct. */
+ ag = g_malloc(sizeof(struct analog_gen));
+ ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
+ ag->packet.channels = cg->channels;
+ ag->packet.mq = 0;
+ ag->packet.mqflags = 0;
+ ag->packet.unit = SR_UNIT_VOLT;
+ ag->packet.data = ag->pattern_data;
+ ag->pattern = pattern;
+ ag->avg_val = 0.0f;
+ ag->num_avgs = 0;
+ g_hash_table_insert(devc->ch_ag, ch, ag);
+
+ if (++pattern == ARRAY_SIZE(analog_pattern_str))
+ pattern = 0;
+ }
}
sdi->priv = devc;
return devices;
}
-static GSList *dev_list(const struct sr_dev_driver *di)
-{
- return ((struct drv_context *)(di->priv))->instances;
-}
-
static int dev_open(struct sr_dev_inst *sdi)
{
sdi->status = SR_ST_ACTIVE;
g_free(devc);
}
-static int cleanup(const struct sr_dev_driver *di)
+static int dev_clear(const struct sr_dev_driver *di)
{
return std_dev_clear(di, clear_helper);
}
return SR_ERR_NA;
}
} else {
- /* Any channel in the group will do. */
ch = cg->channels->data;
switch (key) {
case SR_CONF_DEVICE_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
sizeof(uint32_t));
- else if (ch->type == SR_CHANNEL_ANALOG)
- *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
- devopts_cg_analog, ARRAY_SIZE(devopts_cg_analog),
- sizeof(uint32_t));
+ else if (ch->type == SR_CHANNEL_ANALOG) {
+ if (strcmp(cg->name, "Analog") == 0)
+ *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
+ devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
+ sizeof(uint32_t));
+ else
+ *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
+ devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
+ sizeof(uint32_t));
+ }
else
return SR_ERR_BUG;
break;
case SR_CONF_PATTERN_MODE:
+ /* The analog group (with all 4 channels) shall not have a pattern property. */
+ if (strcmp(cg->name, "Analog") == 0)
+ return SR_ERR_NA;
+
if (ch->type == SR_CHANNEL_LOGIC)
*data = g_variant_new_strv(logic_pattern_str,
ARRAY_SIZE(logic_pattern_str));
static void send_analog_packet(struct analog_gen *ag,
struct sr_dev_inst *sdi,
uint64_t *analog_sent,
+ uint64_t analog_pos,
uint64_t analog_todo)
{
struct sr_datafeed_packet packet;
unsigned int i;
devc = sdi->priv;
- packet.type = SR_DF_ANALOG;
+ packet.type = SR_DF_ANALOG_OLD;
packet.payload = &ag->packet;
if (!devc->avg) {
- ag_pattern_pos = devc->analog_counter % ag->num_samples;
+ ag_pattern_pos = analog_pos % ag->num_samples;
sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
ag->packet.data = ag->pattern_data + ag_pattern_pos;
ag->packet.num_samples = sending_now;
/* Whichever channel group gets there first. */
*analog_sent = MAX(*analog_sent, sending_now);
} else {
- ag_pattern_pos = devc->analog_counter % ag->num_samples;
+ ag_pattern_pos = analog_pos % ag->num_samples;
to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
for (i = 0; i < to_avg; i++) {
struct analog_gen *ag;
GHashTableIter iter;
void *value;
- uint64_t logic_todo, analog_todo, expected_samplenum, analog_sent, sending_now;
- int64_t time, elapsed;
+ uint64_t samples_todo, logic_done, analog_done, analog_sent, sending_now;
+ int64_t elapsed_us, limit_us, todo_us;
(void)fd;
(void)revents;
sdi = cb_data;
devc = sdi->priv;
- logic_todo = analog_todo = 0;
- /* How many samples should we have sent by now? */
- time = g_get_monotonic_time();
- elapsed = time - devc->starttime;
- expected_samplenum = elapsed * devc->cur_samplerate / (1000 * 1000);
+ /* Just in case. */
+ if (devc->cur_samplerate <= 0
+ || (devc->num_logic_channels <= 0
+ && devc->num_analog_channels <= 0)) {
+ dev_acquisition_stop(sdi);
+ return G_SOURCE_CONTINUE;
+ }
- /* But never more than the limit, if there is one. */
- if (!devc->continuous)
- expected_samplenum = MIN(expected_samplenum, devc->limit_samples);
+ /* What time span should we send samples for? */
+ elapsed_us = g_get_monotonic_time() - devc->start_us;
+ limit_us = 1000 * devc->limit_msec;
+ if (limit_us > 0 && limit_us < elapsed_us)
+ todo_us = MAX(0, limit_us - devc->spent_us);
+ else
+ todo_us = MAX(0, elapsed_us - devc->spent_us);
+
+ /* How many samples are outstanding since the last round? */
+ samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
+ / G_USEC_PER_SEC;
+ if (devc->limit_samples > 0) {
+ if (devc->limit_samples < devc->sent_samples)
+ samples_todo = 0;
+ else if (devc->limit_samples - devc->sent_samples < samples_todo)
+ samples_todo = devc->limit_samples - devc->sent_samples;
+ }
+ /* Calculate the actual time covered by this run back from the sample
+ * count, rounded towards zero. This avoids getting stuck on a too-low
+ * time delta with no samples being sent due to round-off.
+ */
+ todo_us = samples_todo * G_USEC_PER_SEC / devc->cur_samplerate;
- /* Of those, how many do we still have to send? */
- if (devc->num_logic_channels)
- logic_todo = expected_samplenum - devc->logic_counter;
- if (devc->num_analog_channels)
- analog_todo = expected_samplenum - devc->analog_counter;
+ logic_done = devc->num_logic_channels > 0 ? 0 : samples_todo;
+ analog_done = devc->num_analog_channels > 0 ? 0 : samples_todo;
- while (logic_todo || analog_todo) {
+ while (logic_done < samples_todo || analog_done < samples_todo) {
/* Logic */
- if (logic_todo > 0) {
- sending_now = MIN(logic_todo, LOGIC_BUFSIZE / devc->logic_unitsize);
+ if (logic_done < samples_todo) {
+ sending_now = MIN(samples_todo - logic_done,
+ LOGIC_BUFSIZE / devc->logic_unitsize);
logic_generator(sdi, sending_now * devc->logic_unitsize);
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.unitsize = devc->logic_unitsize;
logic.data = devc->logic_data;
sr_session_send(sdi, &packet);
- logic_todo -= sending_now;
- devc->logic_counter += sending_now;
+ logic_done += sending_now;
}
/* Analog, one channel at a time */
- if (analog_todo > 0) {
+ if (analog_done < samples_todo) {
analog_sent = 0;
g_hash_table_iter_init(&iter, devc->ch_ag);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
- send_analog_packet(value, sdi,
- &analog_sent, analog_todo);
+ send_analog_packet(value, sdi, &analog_sent,
+ devc->sent_samples + analog_done,
+ samples_todo - analog_done);
}
- analog_todo -= analog_sent;
- devc->analog_counter += analog_sent;
+ analog_done += analog_sent;
}
}
+ /* At this point, both logic_done and analog_done should be
+ * exactly equal to samples_todo, or else.
+ */
+ if (logic_done != samples_todo || analog_done != samples_todo) {
+ sr_err("BUG: Sample count mismatch.");
+ return G_SOURCE_REMOVE;
+ }
+ devc->sent_samples += samples_todo;
+ devc->spent_us += todo_us;
+
+ if ((devc->limit_samples > 0 && devc->sent_samples >= devc->limit_samples)
+ || (limit_us > 0 && devc->spent_us >= limit_us)) {
- if (!devc->continuous
- && (!devc->num_logic_channels || devc->logic_counter >= devc->limit_samples)
- && (!devc->num_analog_channels || devc->analog_counter >= devc->limit_samples)) {
/* If we're averaging everything - now is the time to send data */
if (devc->avg_samples == 0) {
g_hash_table_iter_init(&iter, devc->ch_ag);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
ag = value;
- packet.type = SR_DF_ANALOG;
+ packet.type = SR_DF_ANALOG_OLD;
packet.payload = &ag->packet;
ag->packet.data = &ag->avg_val;
ag->packet.num_samples = 1;
sr_session_send(sdi, &packet);
}
}
-
sr_dbg("Requested number of samples reached.");
- dev_acquisition_stop(sdi, cb_data);
- return TRUE;
+ dev_acquisition_stop(sdi);
}
- return TRUE;
+ return G_SOURCE_CONTINUE;
}
-static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
+static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
GHashTableIter iter;
void *value;
- (void)cb_data;
-
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
devc = sdi->priv;
- devc->continuous = !devc->limit_samples;
- devc->logic_counter = devc->analog_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)) {
- sr_err("%s: pipe() failed", __func__);
- return SR_ERR;
- }
+ devc->sent_samples = 0;
g_hash_table_iter_init(&iter, devc->ch_ag);
while (g_hash_table_iter_next(&iter, NULL, &value))
generate_analog_pattern(value, devc->cur_samplerate);
- 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 unbuffered. */
- g_io_channel_set_buffered(devc->channel, FALSE);
+ sr_session_source_add(sdi->session, -1, 0, 100,
+ prepare_data, (struct sr_dev_inst *)sdi);
- sr_session_source_add_channel(sdi->session, devc->channel,
- G_IO_IN | G_IO_ERR, 40, prepare_data, (void *)sdi);
-
- /* Send header packet to the session bus. */
std_session_send_df_header(sdi, LOG_PREFIX);
/* We use this timestamp to decide how many more samples to send. */
- devc->starttime = g_get_monotonic_time();
+ devc->start_us = g_get_monotonic_time();
+ devc->spent_us = 0;
return SR_OK;
}
-static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
+static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
- struct dev_context *devc;
- struct sr_datafeed_packet packet;
-
- (void)cb_data;
-
- devc = sdi->priv;
sr_dbg("Stopping acquisition.");
-
- sr_session_source_remove_channel(sdi->session, 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(sdi, &packet);
+ sr_session_source_remove(sdi->session, -1);
+ std_session_send_df_end(sdi, LOG_PREFIX);
return SR_OK;
}
-SR_PRIV struct sr_dev_driver demo_driver_info = {
+static struct sr_dev_driver demo_driver_info = {
.name = "demo",
.longname = "Demo driver and pattern generator",
.api_version = 1,
- .init = init,
- .cleanup = cleanup,
+ .init = std_init,
+ .cleanup = std_cleanup,
.scan = scan,
- .dev_list = dev_list,
- .dev_clear = NULL,
+ .dev_list = std_dev_list,
+ .dev_clear = dev_clear,
.config_get = config_get,
.config_set = config_set,
.config_list = config_list,
.dev_close = dev_close,
.dev_acquisition_start = dev_acquisition_start,
.dev_acquisition_stop = dev_acquisition_stop,
- .priv = NULL,
+ .context = NULL,
};
+SR_REGISTER_DEV_DRIVER(demo_driver_info);
projects / libsigrok.git / blobdiff