libsigrok/hardware/motech-lps-30x/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
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* Copyright (C) 2014 Bert Vermeulen <bert@biot.com> (code from atten-pps3xxx)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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/** @file
* <em>Motech LPS-30x series</em> power supply driver
* @internal
*/
#include <errno.h>
#include <string.h>
#include "protocol.h"
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/** Send data packets for current measurements. */
static void send_data(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
int i;
float data[MAX_CHANNELS];
devc = sdi->priv;
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
analog.channels = sdi->channels;
analog.num_samples = 1;
analog.mq = SR_MQ_VOLTAGE;
analog.unit = SR_UNIT_VOLT;
analog.mqflags = SR_MQFLAG_DC;
analog.data = data;
for (i = 0; i < devc->model->num_channels; i++)
analog.data[i] = devc->channel_status[i].output_voltage_last; /* Value always 3.3 or 5 for channel 3, if present! */
sr_session_send(sdi, &packet);
analog.mq = SR_MQ_CURRENT;
analog.unit = SR_UNIT_AMPERE;
analog.mqflags = 0;
analog.data = data;
for (i = 0; i < devc->model->num_channels; i++)
analog.data[i] = devc->channel_status[i].output_current_last; /* Value always 0 for channel 3, if present! */
sr_session_send(sdi, &packet);
devc->num_samples++;
}
/** Process a complete line (without CR/LF) in buf. */
static void process_line(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
double dbl;
int auxint;
devc = sdi->priv;
switch (devc->acq_req_pending) {
case 0: /* Should not happen... */
break;
case 1: /* Waiting for data reply to request */
/* Convert numbers */
switch (devc->acq_req) {
case AQ_U1: case AQ_U2: case AQ_I1: case AQ_I2:
if (sr_atod(devc->buf, &dbl) != SR_OK) {
sr_err("Failed to convert '%s' to double, errno=%d %s",
devc->buf, errno, strerror(errno));
dbl = 0.0;
}
break;
case AQ_STATUS:
if (sr_atoi(devc->buf, &auxint) != SR_OK) {
sr_err("Failed to convert '%s' to int, errno=%d %s",
devc->buf, errno, strerror(errno));
auxint = 0;
}
break;
default:
break;
}
switch (devc->acq_req) {
case AQ_U1:
devc->channel_status[0].output_voltage_last = dbl;
break;
case AQ_I1:
devc->channel_status[0].output_current_last = dbl;
break;
case AQ_U2:
devc->channel_status[1].output_voltage_last = dbl;
break;
case AQ_I2:
devc->channel_status[1].output_current_last = dbl;
break;
case AQ_STATUS: /* Process status and generate data. */
if (lps_process_status(sdi, auxint) == SR_OK) {
send_data(sdi);
}
break;
default:
break;
}
devc->acq_req_pending = 2;
break;
case 2: /* Waiting for OK after request */
if (strcmp(devc->buf, "OK")) {
sr_err("Unexpected reply while waiting for OK: '%s'", devc->buf);
}
devc->acq_req_pending = 0;
break;
}
devc->buf[0] = '\0';
devc->buflen = 0;
}
SR_PRIV int motech_lps_30x_receive_data(int fd, int revents, void *cb_data)
{
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struct sr_dev_inst *sdi;
struct dev_context *devc;
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struct sr_serial_dev_inst *serial;
int len;
gdouble elapsed_s;
(void)fd;
if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
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serial = sdi->conn;
if (revents == G_IO_IN) { /* Serial data arrived. */
while (LINELEN_MAX - devc->buflen - 2 > 0) {
len = serial_read(serial, devc->buf + devc->buflen, 1);
if (len < 1)
break;
/* Eliminate whitespace at beginning of line. */
if (g_ascii_isspace(devc->buf[0])) {
devc->buf[0] = '\0';
devc->buflen = 0;
continue;
}
devc->buflen += len;
devc->buf[devc->buflen] = '\0';
/* If line complete, process msg. */
if ((devc->buflen > 0) && ((devc->buf[devc->buflen-1] == '\r') || devc->buf[devc->buflen-1] == '\n')) {
devc->buflen--;
devc->buf[devc->buflen] = '\0';
sr_spew("Line complete: \"%s\"", devc->buf);
process_line(sdi);
}
}
}
/* If number of samples or time limit reached, stop acquisition. */
if (devc->limit_samples && (devc->num_samples >= devc->limit_samples))
sdi->driver->dev_acquisition_stop(sdi, cb_data);
if (devc->limit_msec) {
elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
if ((elapsed_s * 1000) >= devc->limit_msec)
sdi->driver->dev_acquisition_stop(sdi, cb_data);
}
/* Request next packet, if required. */
if ((sdi->status == SR_ST_ACTIVE) && (devc->acq_running)){
if (devc->acq_req_pending) {
gint64 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) {
sr_spew("Request timeout: req=%d t=%lldus", (int)devc->acq_req, elapsed_us);
devc->acq_req_pending = 0;
}
}
if (devc->acq_req_pending == 0) {
switch(devc->acq_req)
{
case AQ_NONE: /* Fall through */
case AQ_STATUS:
devc->acq_req = AQ_U1;
lps_send_req(serial, "VOUT1");
break;
case AQ_U1:
devc->acq_req = AQ_I1;
lps_send_req(serial, "IOUT1");
break;
case AQ_I1:
if (devc->model->num_channels == 1) {
devc->acq_req = AQ_STATUS;
lps_send_req(serial, "STATUS");
} else {
devc->acq_req = AQ_U2;
lps_send_req(serial, "VOUT2");
}
break;
case AQ_U2:
devc->acq_req = AQ_I2;
lps_send_req(serial, "IOUT2");
break;
case AQ_I2:
devc->acq_req = AQ_STATUS;
lps_send_req(serial, "STATUS");
break;
default:
sr_err("Illegal devc->acq_req=%d", devc->acq_req);
return SR_ERR;
}
devc->req_sent_at = g_get_real_time();
devc->acq_req_pending = 1;
}
}
return TRUE;
}