static int dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct dev_context *devc;
struct sr_scpi_dev_inst *scpi;
struct sr_channel *ch;
struct pps_channel *pch;
int cmd, ret;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
devc = sdi->priv;
scpi = sdi->conn;
devc->cb_data = cb_data;
if ((ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
scpi_pps_receive_data, (void *)sdi)) != SR_OK)
return ret;
std_session_send_df_header(sdi, LOG_PREFIX);
/* Prime the pipe with the first channel's fetch. */
ch = next_enabled_channel(sdi, NULL);
pch = ch->priv;
if ((ret = select_channel(sdi, ch)) != SR_OK)
return ret;
if (pch->mq == SR_MQ_VOLTAGE)
cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
else if (pch->mq == SR_MQ_CURRENT)
cmd = SCPI_CMD_GET_MEAS_CURRENT;
else if (pch->mq == SR_MQ_POWER)
cmd = SCPI_CMD_GET_MEAS_POWER;
else
return SR_ERR;
scpi_cmd(sdi, cmd, pch->hwname);
return SR_OK;
}
SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
const struct sr_dev_inst *sdi;
struct sr_channel *next_channel;
struct sr_scpi_dev_inst *scpi;
struct pps_channel *pch;
float f;
int cmd;
(void)fd;
(void)revents;
if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
scpi = sdi->conn;
/* Retrieve requested value for this state. */
if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
pch = devc->cur_channel->priv;
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
analog.channels = g_slist_append(NULL, devc->cur_channel);
analog.num_samples = 1;
analog.mq = pch->mq;
if (pch->mq == SR_MQ_VOLTAGE)
analog.unit = SR_UNIT_VOLT;
else if (pch->mq == SR_MQ_CURRENT)
analog.unit = SR_UNIT_AMPERE;
else if (pch->mq == SR_MQ_POWER)
analog.unit = SR_UNIT_WATT;
analog.mqflags = SR_MQFLAG_DC;
analog.data = &f;
sr_session_send(sdi, &packet);
g_slist_free(analog.channels);
}
if (g_slist_length(sdi->channels) > 1) {
next_channel = next_enabled_channel(sdi, devc->cur_channel);
if (select_channel(sdi, next_channel) != SR_OK) {
sr_err("Failed to select channel %s", next_channel->name);
return FALSE;
}
}
pch = devc->cur_channel->priv;
if (pch->mq == SR_MQ_VOLTAGE)
cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
else if (pch->mq == SR_MQ_FREQUENCY)
cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
else if (pch->mq == SR_MQ_CURRENT)
cmd = SCPI_CMD_GET_MEAS_CURRENT;
else if (pch->mq == SR_MQ_POWER)
cmd = SCPI_CMD_GET_MEAS_POWER;
else
return SR_ERR;
scpi_cmd(sdi, cmd);
return TRUE;
}
