*/
#include "protocol.h"
+#include <math.h>
+#include <string.h>
+
+#define ANALOG_CHANNELS 2
+#define VERTICAL_DIVISIONS 10
+
+static int read_data(struct sr_dev_inst *sdi,
+ struct sr_scpi_dev_inst *scpi, struct dev_context *devc,
+ int data_size)
+{
+ int len;
+
+ len = sr_scpi_read_data(scpi,
+ &devc->rcv_buffer[devc->cur_rcv_buffer_position],
+ data_size - devc->cur_rcv_buffer_position);
+ if (len < 0) {
+ sr_err("Read data error.");
+ sr_dev_acquisition_stop(sdi);
+ devc->cur_rcv_buffer_position = 0;
+ return SR_ERR;
+ }
+
+ devc->cur_rcv_buffer_position += len;
+
+ /* Handle the case where sr_scpi_read_data stopped at the newline. */
+ if (len < data_size && sr_scpi_read_complete(scpi)) {
+ devc->rcv_buffer[devc->cur_rcv_buffer_position] = '\n';
+ devc->cur_rcv_buffer_position++;
+ }
+
+ if (devc->cur_rcv_buffer_position < data_size)
+ return SR_ERR; /* Not finished yet. */
+ else if (devc->cur_rcv_buffer_position == data_size) {
+ devc->cur_rcv_buffer_position = 0;
+ return SR_OK;
+ } else {
+ sr_err("Too many bytes read.");
+ sr_dev_acquisition_stop(sdi);
+ devc->cur_rcv_buffer_position = 0;
+ return SR_ERR;
+ }
+}
SR_PRIV int gwinstek_gds_800_receive_data(int fd, int revents, void *cb_data)
{
- const struct sr_dev_inst *sdi;
+ struct sr_dev_inst *sdi;
+ struct sr_scpi_dev_inst *scpi;
struct dev_context *devc;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+ char command[32];
+ char *response;
+ float volts_per_division;
+ int num_samples, i;
+ float samples[MAX_SAMPLES];
+ uint32_t sample_rate;
+ char *end_ptr;
(void)fd;
if (!(devc = sdi->priv))
return TRUE;
- if (revents == G_IO_IN) {
- /* TODO */
+ scpi = sdi->conn;
+
+ if (!(revents == G_IO_IN || revents == 0))
+ return TRUE;
+
+ switch (devc->state) {
+ case START_ACQUISITION:
+ if (sr_scpi_send(scpi, ":TRIG:MOD 3") != SR_OK) {
+ sr_err("Failed to set trigger mode to SINGLE.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ if (sr_scpi_send(scpi, ":STOP") != SR_OK) {
+ sr_err("Failed to put the trigger system into STOP state.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ if (sr_scpi_send(scpi, ":RUN") != SR_OK) {
+ sr_err("Failed to put the trigger system into RUN state.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+
+ devc->cur_acq_channel = 0;
+ devc->state = START_TRANSFER_OF_CHANNEL_DATA;
+ break;
+ case START_TRANSFER_OF_CHANNEL_DATA:
+ if (((struct sr_channel *)g_slist_nth_data(sdi->channels, devc->cur_acq_channel))->enabled) {
+ if (sr_scpi_send(scpi, ":ACQ%d:MEM?", devc->cur_acq_channel+1) != SR_OK) {
+ sr_err("Failed to acquire memory.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ if (sr_scpi_read_begin(scpi) != SR_OK) {
+ sr_err("Could not begin reading SCPI response.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ devc->state = WAIT_FOR_TRANSFER_OF_BEGIN_TRANSMISSION_COMPLETE;
+ devc->cur_rcv_buffer_position = 0;
+ } else {
+ /* All channels acquired. */
+ if (devc->cur_acq_channel == ANALOG_CHANNELS - 1) {
+ sr_spew("All channels acquired.");
+
+ if (devc->cur_acq_frame == devc->frame_limit - 1) {
+ /* All frames accquired. */
+ sr_spew("All frames acquired.");
+
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ } else {
+ /* Start acquiring next frame. */
+ if (devc->df_started) {
+ std_session_send_df_frame_end(sdi);
+ std_session_send_df_frame_begin(sdi);
+ }
+
+ devc->cur_acq_frame++;
+ devc->state = START_ACQUISITION;
+ }
+ } else {
+ /* Start acquiring next channel. */
+ devc->cur_acq_channel++;
+ }
+ }
+ break;
+ case WAIT_FOR_TRANSFER_OF_BEGIN_TRANSMISSION_COMPLETE:
+ if (read_data(sdi, scpi, devc, 1) < 0)
+ break;
+ if (devc->rcv_buffer[0] == '#')
+ devc->state = WAIT_FOR_TRANSFER_OF_DATA_SIZE_DIGIT_COMPLETE;
+ break;
+ case WAIT_FOR_TRANSFER_OF_DATA_SIZE_DIGIT_COMPLETE:
+ if (read_data(sdi, scpi, devc, 1) < 0)
+ break;
+ if (devc->rcv_buffer[0] != '4' &&
+ devc->rcv_buffer[0] != '5' &&
+ devc->rcv_buffer[0] != '6') {
+ sr_err("Data size digits is not 4, 5 or 6 but "
+ "'%c'.", devc->rcv_buffer[0]);
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ } else {
+ devc->data_size_digits = devc->rcv_buffer[0] - '0';
+ devc->state = WAIT_FOR_TRANSFER_OF_DATA_SIZE_COMPLETE;
+ }
+ break;
+ case WAIT_FOR_TRANSFER_OF_DATA_SIZE_COMPLETE:
+ if (read_data(sdi, scpi, devc, devc->data_size_digits) < 0)
+ break;
+ devc->rcv_buffer[devc->data_size_digits] = 0;
+ if (sr_atoi(devc->rcv_buffer, &devc->data_size) != SR_OK) {
+ sr_err("Could not parse data size '%s'", devc->rcv_buffer);
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ } else
+ devc->state = WAIT_FOR_TRANSFER_OF_SAMPLE_RATE_COMPLETE;
+ break;
+ case WAIT_FOR_TRANSFER_OF_SAMPLE_RATE_COMPLETE:
+ if (read_data(sdi, scpi, devc, sizeof(float)) < 0)
+ break;
+ /*
+ * Contrary to the documentation, this field is
+ * transfered with most significant byte first!
+ */
+ sample_rate = RB32(devc->rcv_buffer);
+ memcpy(&devc->sample_rate, &sample_rate, sizeof(float));
+ devc->state = WAIT_FOR_TRANSFER_OF_CHANNEL_INDICATOR_COMPLETE;
+
+ if (!devc->df_started) {
+ std_session_send_df_header(sdi);
+ std_session_send_df_frame_begin(sdi);
+ devc->df_started = TRUE;
+ }
+ break;
+ case WAIT_FOR_TRANSFER_OF_CHANNEL_INDICATOR_COMPLETE:
+ if (read_data(sdi, scpi, devc, 1) == SR_OK)
+ devc->state = WAIT_FOR_TRANSFER_OF_RESERVED_DATA_COMPLETE;
+ break;
+ case WAIT_FOR_TRANSFER_OF_RESERVED_DATA_COMPLETE:
+ if (read_data(sdi, scpi, devc, 3) == SR_OK)
+ devc->state = WAIT_FOR_TRANSFER_OF_CHANNEL_DATA_COMPLETE;
+ break;
+ case WAIT_FOR_TRANSFER_OF_CHANNEL_DATA_COMPLETE:
+ if (read_data(sdi, scpi, devc, devc->data_size - 8) < 0)
+ break;
+
+ /* Fetch data needed for conversion from device. */
+ snprintf(command, sizeof(command), ":CHAN%d:SCAL?",
+ devc->cur_acq_channel + 1);
+ if (sr_scpi_get_string(scpi, command, &response) != SR_OK) {
+ sr_err("Failed to get volts per division.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ volts_per_division = g_ascii_strtod(response, &end_ptr);
+ if (!strcmp(end_ptr, "mV"))
+ volts_per_division *= 1.e-3;
+ g_free(response);
+
+ num_samples = (devc->data_size - 8) / 2;
+ sr_spew("Received %d number of samples from channel "
+ "%d.", num_samples, devc->cur_acq_channel + 1);
+
+ float vbit = volts_per_division * VERTICAL_DIVISIONS / 256.0;
+ float vbitlog = log10f(vbit);
+ int digits = -(int)vbitlog + (vbitlog < 0.0);
+
+ /* Convert data. */
+ for (i = 0; i < num_samples; i++)
+ samples[i] = ((float) ((int16_t) (RB16(&devc->rcv_buffer[i*2])))) * vbit;
+
+ /* Fill frame. */
+ sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
+ analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, devc->cur_acq_channel));
+ analog.num_samples = num_samples;
+ analog.data = samples;
+ analog.meaning->mq = SR_MQ_VOLTAGE;
+ analog.meaning->unit = SR_UNIT_VOLT;
+ analog.meaning->mqflags = 0;
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(sdi, &packet);
+ g_slist_free(analog.meaning->channels);
+
+ /* All channels acquired. */
+ if (devc->cur_acq_channel == ANALOG_CHANNELS - 1) {
+ sr_spew("All channels acquired.");
+
+ if (devc->cur_acq_frame == devc->frame_limit - 1) {
+ /* All frames acquired. */
+ sr_spew("All frames acquired.");
+ sr_dev_acquisition_stop(sdi);
+ return TRUE;
+ } else {
+ /* Start acquiring next frame. */
+ if (devc->df_started) {
+ std_session_send_df_frame_end(sdi);
+ std_session_send_df_frame_begin(sdi);
+ }
+ devc->cur_acq_frame++;
+ devc->state = START_ACQUISITION;
+ }
+ } else {
+ /* Start acquiring next channel. */
+ devc->state = START_TRANSFER_OF_CHANNEL_DATA;
+ devc->cur_acq_channel++;
+ return TRUE;
+ }
+ break;
}
return TRUE;
projects / libsigrok.git / blobdiff