{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
};
-SR_PRIV void demo_generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
+SR_PRIV void demo_generate_analog_pattern(struct dev_context *devc)
{
double t, frequency;
- float value;
+ float amplitude, offset;
+ struct analog_pattern *pattern;
unsigned int num_samples, i;
+ float value;
int last_end;
- sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]);
-
num_samples = ANALOG_BUFSIZE / sizeof(float);
+ frequency = (double) devc->cur_samplerate / ANALOG_SAMPLES_PER_PERIOD;
+ amplitude = DEFAULT_ANALOG_AMPLITUDE;
+ offset = DEFAULT_ANALOG_OFFSET;
+
+ /*
+ * FIXME: We actually need only one period. A ringbuffer would be
+ * useful here.
+ * Make sure the number of samples we put out is an integer
+ * multiple of our period size.
+ */
- switch (ag->pattern) {
- case PATTERN_SQUARE:
- value = ag->amplitude;
- last_end = 0;
- for (i = 0; i < num_samples; i++) {
- if (i % 5 == 0)
- value = -value;
- if (i % 10 == 0)
- last_end = i;
- ag->pattern_data[i] = value;
- }
- ag->num_samples = last_end;
- break;
- case PATTERN_SINE:
- frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
-
- /* Make sure the number of samples we put out is an integer
- * multiple of our period size */
- /* FIXME we actually need only one period. A ringbuffer would be
- * useful here. */
- while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
- num_samples--;
-
- for (i = 0; i < num_samples; i++) {
- t = (double) i / (double) sample_rate;
- ag->pattern_data[i] = ag->amplitude *
- sin(2 * G_PI * frequency * t);
- }
-
- ag->num_samples = num_samples;
- break;
- case PATTERN_TRIANGLE:
- frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
-
- while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
- num_samples--;
-
- for (i = 0; i < num_samples; i++) {
- t = (double) i / (double) sample_rate;
- ag->pattern_data[i] = (2 * ag->amplitude / G_PI) *
- asin(sin(2 * G_PI * frequency * t));
- }
-
- ag->num_samples = num_samples;
- break;
- case PATTERN_SAWTOOTH:
- frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
-
- while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
- num_samples--;
-
- for (i = 0; i < num_samples; i++) {
- t = (double) i / (double) sample_rate;
- ag->pattern_data[i] = 2 * ag->amplitude *
- ((t * frequency) - floor(0.5f + t * frequency));
- }
-
- ag->num_samples = num_samples;
- break;
+ /* PATTERN_SQUARE: */
+ sr_dbg("Generating %s pattern.", analog_pattern_str[PATTERN_SQUARE]);
+ pattern = g_malloc(sizeof(struct analog_pattern));
+ value = amplitude;
+ last_end = 0;
+ for (i = 0; i < num_samples; i++) {
+ if (i % 5 == 0)
+ value = -value;
+ if (i % 10 == 0)
+ last_end = i;
+ pattern->data[i] = value + offset;
+ }
+ pattern->num_samples = last_end;
+ devc->analog_patterns[PATTERN_SQUARE] = pattern;
+
+ /* Readjusting num_samples for all other patterns. */
+ while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
+ num_samples--;
+
+ /* PATTERN_SINE: */
+ sr_dbg("Generating %s pattern.", analog_pattern_str[PATTERN_SINE]);
+ pattern = g_malloc(sizeof(struct analog_pattern));
+ for (i = 0; i < num_samples; i++) {
+ t = (double) i / (double) devc->cur_samplerate;
+ pattern->data[i] = sin(2 * G_PI * frequency * t) * amplitude + offset;
+ }
+ pattern->num_samples = last_end;
+ devc->analog_patterns[PATTERN_SINE] = pattern;
+
+ /* PATTERN_TRIANGLE: */
+ sr_dbg("Generating %s pattern.", analog_pattern_str[PATTERN_TRIANGLE]);
+ pattern = g_malloc(sizeof(struct analog_pattern));
+ for (i = 0; i < num_samples; i++) {
+ t = (double) i / (double) devc->cur_samplerate;
+ pattern->data[i] = (2 / G_PI) * asin(sin(2 * G_PI * frequency * t)) *
+ amplitude + offset;
}
+ pattern->num_samples = last_end;
+ devc->analog_patterns[PATTERN_TRIANGLE] = pattern;
+
+ /* PATTERN_SAWTOOTH: */
+ sr_dbg("Generating %s pattern.", analog_pattern_str[PATTERN_SAWTOOTH]);
+ pattern = g_malloc(sizeof(struct analog_pattern));
+ for (i = 0; i < num_samples; i++) {
+ t = (double) i / (double) devc->cur_samplerate;
+ pattern->data[i] = 2 * ((t * frequency) - floor(0.5f + t * frequency)) *
+ amplitude + offset;
+ }
+ pattern->num_samples = last_end;
+ devc->analog_patterns[PATTERN_SAWTOOTH] = pattern;
}
static uint64_t encode_number_to_gray(uint64_t nr)
{
struct sr_datafeed_packet packet;
struct dev_context *devc;
+ struct analog_pattern *pattern;
uint64_t sending_now, to_avg;
int ag_pattern_pos;
unsigned int i;
+ float amplitude, offset, value;
+ float *data;
if (!ag->ch || !ag->ch->enabled)
return;
packet.type = SR_DF_ANALOG;
packet.payload = &ag->packet;
+ pattern = devc->analog_patterns[ag->pattern];
+
ag->packet.meaning->channels = g_slist_append(NULL, ag->ch);
ag->packet.meaning->mq = ag->mq;
ag->packet.meaning->mqflags = ag->mq_flags;
- /* Set a unit for the given quantity */
+ /* Set a unit for the given quantity. */
if (ag->mq == SR_MQ_VOLTAGE)
ag->packet.meaning->unit = SR_UNIT_VOLT;
else if (ag->mq == SR_MQ_CURRENT)
ag->packet.meaning->unit = SR_UNIT_UNITLESS;
if (!devc->avg) {
- 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_pattern_pos = analog_pos % pattern->num_samples;
+ sending_now = MIN(analog_todo, pattern->num_samples - ag_pattern_pos);
+ if (ag->amplitude != DEFAULT_ANALOG_AMPLITUDE ||
+ ag->offset != DEFAULT_ANALOG_OFFSET) {
+
+ /* Amplitude or offset changed, modify each sample. */
+ amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
+ offset = ag->offset - DEFAULT_ANALOG_OFFSET;
+ data = ag->packet.data;
+ for (i = 0; i < sending_now; i++)
+ data[i] = pattern->data[ag_pattern_pos + i] * amplitude + offset;
+ } else {
+ /* Amplitude and offset unchanged, use the fast way. */
+ ag->packet.data = pattern->data + ag_pattern_pos;
+ }
ag->packet.num_samples = sending_now;
sr_session_send(sdi, &packet);
/* Whichever channel group gets there first. */
*analog_sent = MAX(*analog_sent, sending_now);
} else {
- ag_pattern_pos = analog_pos % ag->num_samples;
- to_avg = MIN(analog_todo, ag->num_samples - ag_pattern_pos);
+ ag_pattern_pos = analog_pos % pattern->num_samples;
+ to_avg = MIN(analog_todo, pattern->num_samples - ag_pattern_pos);
+ amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
+ offset = ag->offset - DEFAULT_ANALOG_OFFSET;
for (i = 0; i < to_avg; i++) {
- ag->avg_val = (ag->avg_val +
- *(ag->pattern_data +
- ag_pattern_pos + i)) / 2;
+ value = *(pattern->data + ag_pattern_pos + i) * amplitude + offset;
+ ag->avg_val = (ag->avg_val + value) / 2;
ag->num_avgs++;
/* Time to send averaged data? */
if ((devc->avg_samples > 0) && (ag->num_avgs >= devc->avg_samples))
}
if (devc->avg_samples == 0) {
- /* We're averaging all the samples, so wait with
+ /*
+ * We're averaging all the samples, so wait with
* sending until the very end.
*/
*analog_sent = ag->num_avgs;
projects / libsigrok.git / blobdiff