X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fdemo%2Fdemo.c;h=b5cb276c9747f4011ed42ef8917abe1cf3866aa5;hb=0af636bed97c174bea46e61e961eaa1b0b162e0f;hp=b2f3a50915227ee4b96cd4b9dd7d45b2a0a1262f;hpb=155b680da482cea2381becb73c51cfb838bff31e;p=libsigrok.git diff --git a/src/hardware/demo/demo.c b/src/hardware/demo/demo.c index b2f3a509..b5cb276c 100644 --- a/src/hardware/demo/demo.c +++ b/src/hardware/demo/demo.c @@ -42,7 +42,7 @@ /* Size of the analog pattern space per channel. */ #define ANALOG_BUFSIZE 4096 -#define ANALOG_AMPLITUDE 25 +#define DEFAULT_ANALOG_AMPLITUDE 25 #define ANALOG_SAMPLES_PER_PERIOD 20 /* Logic patterns we can generate. */ @@ -99,6 +99,7 @@ static const char *analog_pattern_str[] = { struct analog_gen { int pattern; + float amplitude; float pattern_data[ANALOG_BUFSIZE]; unsigned int num_samples; struct sr_datafeed_analog packet; @@ -109,6 +110,7 @@ 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; @@ -123,24 +125,34 @@ struct dev_context { unsigned char logic_data[LOGIC_BUFSIZE]; /* Analog */ int32_t num_analog_channels; - GSList *analog_channel_groups; + GHashTable *ch_ag; }; -static const int32_t scanopts[] = { +static const uint32_t scanopts[] = { SR_CONF_NUM_LOGIC_CHANNELS, SR_CONF_NUM_ANALOG_CHANNELS, }; -static const int devopts[] = { - SR_CONF_LOGIC_ANALYZER, +static const uint32_t devopts[] = { SR_CONF_DEMO_DEV, - SR_CONF_SAMPLERATE, - SR_CONF_LIMIT_SAMPLES, - SR_CONF_LIMIT_MSEC, + SR_CONF_LOGIC_ANALYZER, + SR_CONF_OSCILLOSCOPE, + SR_CONF_CONTINUOUS, + SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET, + SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET, +}; + +static const uint32_t devopts_global[] = { + SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST, }; -static const int devopts_cg[] = { - SR_CONF_PATTERN_MODE, +static const uint32_t devopts_cg_logic[] = { + SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST, +}; + +static const uint32_t devopts_cg_analog[] = { + SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST, + SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET, }; static const uint64_t samplerates[] = { @@ -171,23 +183,20 @@ static int init(struct sr_context *sr_ctx) return std_init(sr_ctx, di, LOG_PREFIX); } -static void generate_analog_pattern(const struct sr_channel_group *cg, uint64_t sample_rate) +static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate) { - struct analog_gen *ag; double t, frequency; float value; unsigned int num_samples, i; int last_end; - ag = cg->priv; - num_samples = ANALOG_BUFSIZE / sizeof(float); + sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]); - sr_dbg("Generating %s pattern for channel group %s", - analog_pattern_str[ag->pattern], cg->name); + num_samples = ANALOG_BUFSIZE / sizeof(float); switch (ag->pattern) { case PATTERN_SQUARE: - value = ANALOG_AMPLITUDE; + value = ag->amplitude; last_end = 0; for (i = 0; i < num_samples; i++) { if (i % 5 == 0) @@ -211,7 +220,7 @@ static void generate_analog_pattern(const struct sr_channel_group *cg, uint64_t for (i = 0; i < num_samples; i++) { t = (double) i / (double) sample_rate; - ag->pattern_data[i] = ANALOG_AMPLITUDE * + ag->pattern_data[i] = ag->amplitude * sin(2 * M_PI * frequency * t); } @@ -226,7 +235,7 @@ static void generate_analog_pattern(const struct sr_channel_group *cg, uint64_t for (i = 0; i < num_samples; i++) { t = (double) i / (double) sample_rate; - ag->pattern_data[i] = (2 * ANALOG_AMPLITUDE / M_PI) * + ag->pattern_data[i] = (2 * ag->amplitude / M_PI) * asin(sin(2 * M_PI * frequency * t)); } @@ -241,7 +250,7 @@ static void generate_analog_pattern(const struct sr_channel_group *cg, uint64_t for (i = 0; i < num_samples; i++) { t = (double) i / (double) sample_rate; - ag->pattern_data[i] = 2 * ANALOG_AMPLITUDE * + ag->pattern_data[i] = 2 * ag->amplitude * ((t * frequency) - floor(0.5f + t * frequency)); } @@ -256,7 +265,7 @@ static GSList *scan(GSList *options) struct dev_context *devc; struct sr_dev_inst *sdi; struct sr_channel *ch; - struct sr_channel_group *cg; + struct sr_channel_group *cg, *acg; struct sr_config *src; struct analog_gen *ag; GSList *devices, *l; @@ -280,33 +289,26 @@ static GSList *scan(GSList *options) } devices = NULL; - sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Demo device", NULL, NULL); - if (!sdi) { - sr_err("Device instance creation failed."); - return NULL; - } + + sdi = sr_dev_inst_new(); + sdi->status = SR_ST_ACTIVE; + sdi->model = "Demo device"; sdi->driver = di; - if (!(devc = g_try_malloc(sizeof(struct dev_context)))) { - sr_err("Device context malloc failed."); - return NULL; - } + devc = g_malloc(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->analog_channel_groups = NULL; /* Logic channels, all in one channel group. */ - if (!(cg = g_try_malloc(sizeof(struct sr_channel_group)))) - return NULL; + cg = g_malloc0(sizeof(struct sr_channel_group)); cg->name = g_strdup("Logic"); - cg->channels = NULL; - cg->priv = NULL; for (i = 0; i < num_logic_channels; i++) { sprintf(channel_name, "D%d", i); if (!(ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE, channel_name))) @@ -317,34 +319,36 @@ static GSList *scan(GSList *options) 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++) { - sprintf(channel_name, "A%d", i); - if (!(ch = sr_channel_new(i + num_logic_channels, - SR_CHANNEL_ANALOG, TRUE, channel_name))) - return NULL; + snprintf(channel_name, 16, "A%d", i); + ch = sr_channel_new(i + num_logic_channels, SR_CHANNEL_ANALOG, + TRUE, channel_name); sdi->channels = g_slist_append(sdi->channels, ch); + acg->channels = g_slist_append(acg->channels, ch); - /* Every analog channel gets its own channel group. */ - if (!(cg = g_try_malloc(sizeof(struct sr_channel_group)))) - return NULL; + /* 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 group gets a generator struct. */ - if (!(ag = g_try_malloc(sizeof(struct analog_gen)))) - return NULL; + /* 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; - cg->priv = ag; - - sdi->channel_groups = g_slist_append(sdi->channel_groups, cg); - devc->analog_channel_groups = g_slist_append(devc->analog_channel_groups, cg); + g_hash_table_insert(devc->ch_ag, ch, ag); if (++pattern == ARRAY_SIZE(analog_pattern_str)) pattern = 0; @@ -376,12 +380,28 @@ static int dev_close(struct sr_dev_inst *sdi) return SR_OK; } +static void clear_helper(void *priv) +{ + struct dev_context *devc; + GHashTableIter iter; + void *value; + + devc = priv; + + /* Analog generators. */ + g_hash_table_iter_init(&iter, devc->ch_ag); + while (g_hash_table_iter_next(&iter, NULL, &value)) + g_free(value); + g_hash_table_unref(devc->ch_ag); + g_free(devc); +} + static int cleanup(void) { - return std_dev_clear(di, NULL); + return std_dev_clear(di, clear_helper); } -static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, +static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) { struct dev_context *devc; @@ -393,7 +413,7 @@ static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, return SR_ERR_ARG; devc = sdi->priv; - switch (id) { + switch (key) { case SR_CONF_SAMPLERATE: *data = g_variant_new_uint64(devc->cur_samplerate); break; @@ -406,22 +426,27 @@ static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, case SR_CONF_PATTERN_MODE: if (!cg) return SR_ERR_CHANNEL_GROUP; + /* Any channel in the group will do. */ ch = cg->channels->data; if (ch->type == SR_CHANNEL_LOGIC) { pattern = devc->logic_pattern; *data = g_variant_new_string(logic_pattern_str[pattern]); } else if (ch->type == SR_CHANNEL_ANALOG) { - ag = cg->priv; + ag = g_hash_table_lookup(devc->ch_ag, ch); pattern = ag->pattern; *data = g_variant_new_string(analog_pattern_str[pattern]); } else return SR_ERR_BUG; break; - case SR_CONF_NUM_LOGIC_CHANNELS: - *data = g_variant_new_int32(devc->num_logic_channels); - break; - case SR_CONF_NUM_ANALOG_CHANNELS: - *data = g_variant_new_int32(devc->num_analog_channels); + case SR_CONF_AMPLITUDE: + if (!cg) + return SR_ERR_CHANNEL_GROUP; + /* Any channel in the group will do. */ + ch = cg->channels->data; + if (ch->type != SR_CHANNEL_ANALOG) + return SR_ERR_ARG; + ag = g_hash_table_lookup(devc->ch_ag, ch); + *data = g_variant_new_double(ag->amplitude); break; default: return SR_ERR_NA; @@ -430,13 +455,14 @@ static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, return SR_OK; } -static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, +static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) { struct dev_context *devc; struct analog_gen *ag; struct sr_channel *ch; - int pattern, ret; + GSList *l; + int logic_pattern, analog_pattern, ret; unsigned int i; const char *stropt; @@ -446,7 +472,7 @@ static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, return SR_ERR_DEV_CLOSED; ret = SR_OK; - switch (id) { + switch (key) { case SR_CONF_SAMPLERATE: devc->cur_samplerate = g_variant_get_uint64(data); sr_dbg("Setting samplerate to %" PRIu64, devc->cur_samplerate); @@ -465,41 +491,55 @@ static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, if (!cg) return SR_ERR_CHANNEL_GROUP; stropt = g_variant_get_string(data, NULL); - ch = cg->channels->data; - pattern = -1; - if (ch->type == SR_CHANNEL_LOGIC) { - for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) { - if (!strcmp(stropt, logic_pattern_str[i])) { - pattern = i; - break; - } + logic_pattern = analog_pattern = -1; + for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) { + if (!strcmp(stropt, logic_pattern_str[i])) { + logic_pattern = i; + break; } - if (pattern == -1) - return SR_ERR_ARG; - devc->logic_pattern = pattern; - - /* Might as well do this now, these are static. */ - if (pattern == PATTERN_ALL_LOW) - memset(devc->logic_data, 0x00, LOGIC_BUFSIZE); - else if (pattern == PATTERN_ALL_HIGH) - memset(devc->logic_data, 0xff, LOGIC_BUFSIZE); - sr_dbg("Setting logic pattern to %s", - logic_pattern_str[pattern]); - } else if (ch->type == SR_CHANNEL_ANALOG) { - for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) { - if (!strcmp(stropt, analog_pattern_str[i])) { - pattern = i; - break; - } + } + for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) { + if (!strcmp(stropt, analog_pattern_str[i])) { + analog_pattern = i; + break; } - if (pattern == -1) + } + if (logic_pattern == -1 && analog_pattern == -1) + return SR_ERR_ARG; + for (l = cg->channels; l; l = l->next) { + ch = l->data; + if (ch->type == SR_CHANNEL_LOGIC) { + if (logic_pattern == -1) + return SR_ERR_ARG; + sr_dbg("Setting logic pattern to %s", + logic_pattern_str[logic_pattern]); + devc->logic_pattern = logic_pattern; + /* Might as well do this now, these are static. */ + if (logic_pattern == PATTERN_ALL_LOW) + memset(devc->logic_data, 0x00, LOGIC_BUFSIZE); + else if (logic_pattern == PATTERN_ALL_HIGH) + memset(devc->logic_data, 0xff, LOGIC_BUFSIZE); + } else if (ch->type == SR_CHANNEL_ANALOG) { + if (analog_pattern == -1) + return SR_ERR_ARG; + sr_dbg("Setting analog pattern for channel %s to %s", + ch->name, analog_pattern_str[analog_pattern]); + ag = g_hash_table_lookup(devc->ch_ag, ch); + ag->pattern = analog_pattern; + } else + return SR_ERR_BUG; + } + break; + case SR_CONF_AMPLITUDE: + if (!cg) + return SR_ERR_CHANNEL_GROUP; + for (l = cg->channels; l; l = l->next) { + ch = l->data; + if (ch->type != SR_CHANNEL_ANALOG) return SR_ERR_ARG; - sr_dbg("Setting analog pattern for channel group %s to %s", - cg->name, analog_pattern_str[pattern]); - ag = cg->priv; - ag->pattern = pattern; - } else - return SR_ERR_BUG; + ag = g_hash_table_lookup(devc->ch_ag, ch); + ag->amplitude = g_variant_get_double(data); + } break; default: ret = SR_ERR_NA; @@ -508,7 +548,7 @@ static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, return ret; } -static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, +static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) { struct sr_channel *ch; @@ -518,8 +558,14 @@ static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, (void)sdi; if (key == SR_CONF_SCAN_OPTIONS) { - *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, - scanopts, ARRAY_SIZE(scanopts), sizeof(int32_t)); + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32, + scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t)); + return SR_OK; + } + + if (key == SR_CONF_DEVICE_OPTIONS && !sdi) { + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32, + devopts, ARRAY_SIZE(devopts), sizeof(uint32_t)); return SR_OK; } @@ -529,8 +575,8 @@ static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, if (!cg) { switch (key) { case SR_CONF_DEVICE_OPTIONS: - *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, - devopts, ARRAY_SIZE(devopts), sizeof(int32_t)); + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32, + devopts_global, ARRAY_SIZE(devopts_global), sizeof(uint32_t)); break; case SR_CONF_SAMPLERATE: g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}")); @@ -543,11 +589,20 @@ static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, 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_INT32, - devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(int32_t)); + if (ch->type == SR_CHANNEL_LOGIC) + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, + 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_INT32, + devopts_cg_analog, ARRAY_SIZE(devopts_cg_analog), + sizeof(uint32_t)); + else + return SR_ERR_BUG; break; case SR_CONF_PATTERN_MODE: if (ch->type == SR_CHANNEL_LOGIC) @@ -615,10 +670,10 @@ static int prepare_data(int fd, int revents, void *cb_data) struct dev_context *devc; struct sr_datafeed_packet packet; struct sr_datafeed_logic logic; - struct sr_channel_group *cg; struct analog_gen *ag; - GSList *l; - uint64_t logic_todo, analog_todo, expected_samplenum, analog_samples, sending_now; + GHashTableIter iter; + void *value; + uint64_t logic_todo, analog_todo, expected_samplenum, analog_sent, sending_now; int64_t time, elapsed; (void)fd; @@ -626,21 +681,27 @@ static int prepare_data(int fd, int revents, void *cb_data) sdi = cb_data; devc = sdi->priv; + logic_todo = analog_todo = 0; - /* How many "virtual" samples should we have collected by now? */ + /* How many samples should we have sent by now? */ time = g_get_monotonic_time(); elapsed = time - devc->starttime; expected_samplenum = elapsed * devc->cur_samplerate / 1000000; + /* But never more than the limit, if there is one. */ + if (!devc->continuous) + expected_samplenum = MIN(expected_samplenum, devc->limit_samples); + /* Of those, how many do we still have to send? */ - logic_todo = MIN(expected_samplenum, devc->limit_samples) - devc->logic_counter; - analog_todo = MIN(expected_samplenum, devc->limit_samples) - devc->analog_counter; + if (devc->num_logic_channels) + logic_todo = expected_samplenum - devc->logic_counter; + if (devc->num_analog_channels) + analog_todo = expected_samplenum - devc->analog_counter; while (logic_todo || analog_todo) { /* Logic */ - if (devc->num_logic_channels > 0 && logic_todo > 0) { - sending_now = MIN(logic_todo, - LOGIC_BUFSIZE / devc->logic_unitsize); + if (logic_todo > 0) { + sending_now = MIN(logic_todo, LOGIC_BUFSIZE / devc->logic_unitsize); logic_generator(sdi, sending_now * devc->logic_unitsize); packet.type = SR_DF_LOGIC; packet.payload = &logic; @@ -653,11 +714,12 @@ static int prepare_data(int fd, int revents, void *cb_data) } /* Analog, one channel at a time */ - if (devc->num_analog_channels > 0 && analog_todo > 0) { - sending_now = 0; - for (l = devc->analog_channel_groups; l; l = l->next) { - cg = l->data; - ag = cg->priv; + if (analog_todo > 0) { + analog_sent = 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.payload = &ag->packet; @@ -666,19 +728,21 @@ static int prepare_data(int fd, int revents, void *cb_data) * beginning of our buffer. A ring buffer would * help here as well */ - analog_samples = MIN(analog_todo, ag->num_samples); - /* Whichever channel group gets there first. */ - sending_now = MAX(sending_now, analog_samples); - ag->packet.num_samples = analog_samples; + sending_now = MIN(analog_todo, ag->num_samples); + ag->packet.num_samples = sending_now; sr_session_send(sdi, &packet); + + /* Whichever channel group gets there first. */ + analog_sent = MAX(analog_sent, sending_now); } - analog_todo -= sending_now; - devc->analog_counter += sending_now; + analog_todo -= analog_sent; + devc->analog_counter += analog_sent; } } - if (devc->logic_counter >= devc->limit_samples && - devc->analog_counter >= devc->limit_samples) { + if (!devc->continuous + && (!devc->num_logic_channels || devc->logic_counter >= devc->limit_samples) + && (!devc->num_analog_channels || devc->analog_counter >= devc->limit_samples)) { sr_dbg("Requested number of samples reached."); dev_acquisition_stop(sdi, cb_data); return TRUE; @@ -689,8 +753,9 @@ static int prepare_data(int fd, int revents, void *cb_data) static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) { - GSList *l; struct dev_context *devc; + GHashTableIter iter; + void *value; (void)cb_data; @@ -698,8 +763,7 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) return SR_ERR_DEV_CLOSED; devc = sdi->priv; - if (devc->limit_samples == 0) - return SR_ERR; + devc->continuous = !devc->limit_samples; devc->logic_counter = devc->analog_counter = 0; /* @@ -714,22 +778,21 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) return SR_ERR; } - for (l = devc->analog_channel_groups; l; l = l->next) { - generate_analog_pattern(l->data, devc->cur_samplerate); - } + 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 to unbuffered. */ + /* Make channels unbuffered. */ g_io_channel_set_buffered(devc->channel, FALSE); - sr_session_source_add_channel(sdi->session, devc->channel, G_IO_IN | G_IO_ERR, - 40, prepare_data, (void *)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);