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libsigrok/hardware/rigol-ds1xx2/api.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2012 Martin Ling <martin-git@earth.li>
*
* 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/>.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
#define NUM_PROBES 2
static const int hwcaps[] = {
SR_HWCAP_OSCILLOSCOPE,
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_TIMEBASE,
SR_HWCAP_TRIGGER_SOURCE,
SR_HWCAP_TRIGGER_SLOPE,
SR_HWCAP_HORIZ_TRIGGERPOS,
SR_HWCAP_VDIV,
SR_HWCAP_COUPLING,
0,
};
static const char *probe_names[] = {
"CH1", "CH2",
NULL,
};
static const struct sr_rational timebases[] = {
/* nanoseconds */
{ 2, 1000000000 },
{ 5, 1000000000 },
{ 10, 1000000000 },
{ 20, 1000000000 },
{ 50, 1000000000 },
{ 100, 1000000000 },
{ 500, 1000000000 },
/* microseconds */
{ 1, 1000000 },
{ 2, 1000000 },
{ 5, 1000000 },
{ 10, 1000000 },
{ 20, 1000000 },
{ 50, 1000000 },
{ 100, 1000000 },
{ 200, 1000000 },
{ 500, 1000000 },
/* milliseconds */
{ 1, 1000 },
{ 2, 1000 },
{ 5, 1000 },
{ 10, 1000 },
{ 20, 1000 },
{ 50, 1000 },
{ 100, 1000 },
{ 200, 1000 },
{ 500, 1000 },
/* seconds */
{ 1, 1 },
{ 2, 1 },
{ 5, 1 },
{ 10, 1 },
{ 20, 1 },
{ 50, 1 },
{ 0, 0},
};
static const struct sr_rational vdivs[] = {
/* millivolts */
{ 2, 1000 },
{ 5, 1000 },
{ 10, 1000 },
{ 20, 1000 },
{ 50, 1000 },
{ 100, 1000 },
{ 200, 1000 },
{ 500, 1000 },
/* volts */
{ 1, 1 },
{ 2, 1 },
{ 5, 1 },
{ 10, 1 },
{ 0, 0 },
};
static const char *trigger_sources[] = {
"CH1",
"CH2",
"EXT",
"AC Line",
NULL,
};
static const char *coupling[] = {
"AC",
"DC",
"GND",
NULL,
};
SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info;
static struct sr_dev_driver *di = &rigol_ds1xx2_driver_info;
/* Properly close and free all devices. */
static int clear_instances(void)
{
struct sr_dev_inst *sdi;
struct drv_context *drvc;
struct dev_context *devc;
GSList *l;
if (!(drvc = di->priv))
return SR_OK;
for (l = drvc->instances; l; l = l->next) {
if (!(sdi = l->data))
continue;
if (!(devc = sdi->priv))
continue;
g_free(devc->device);
close(devc->fd);
sr_dev_inst_free(sdi);
}
g_slist_free(drvc->instances);
drvc->instances = NULL;
return SR_OK;
}
static int hw_init(struct sr_context *sr_ctx)
{
struct drv_context *drvc;
(void)sr_ctx;
if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
sr_err("Driver context malloc failed.");
return SR_ERR_MALLOC;
}
di->priv = drvc;
return SR_OK;
}
static GSList *hw_scan(GSList *options)
{
struct drv_context *drvc;
struct sr_dev_inst *sdi;
struct dev_context *devc;
struct sr_probe *probe;
GSList *devices;
GDir *dir;
const gchar *dev_name;
const gchar *dev_dir = "/dev/";
const gchar *prefix = "usbtmc";
gchar *device;
const gchar *idn_query = "*IDN?";
int len, num_tokens, fd, i;
const gchar *delimiter = ",";
gchar **tokens;
char buf[256];
(void)options;
devices = NULL;
drvc = di->priv;
drvc->instances = NULL;
dir = g_dir_open("/sys/class/usb/", 0, NULL);
if (dir == NULL)
return NULL;
while ((dev_name = g_dir_read_name(dir)) != NULL) {
if (strncmp(dev_name, prefix, strlen(prefix)))
continue;
device = g_strconcat(dev_dir, dev_name, NULL);
fd = open(device, O_RDWR);
len = write(fd, idn_query, strlen(idn_query));
len = read(fd, buf, sizeof(buf));
close(fd);
if (len == 0) {
g_free(device);
return NULL;
}
buf[len] = 0;
tokens = g_strsplit(buf, delimiter, 0);
close(fd);
for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, tokens[0],
num_tokens > 1 ? tokens[1] : NULL,
num_tokens > 3 ? tokens[3] : NULL))) {
g_strfreev(tokens);
g_free(device);
return NULL;
}
g_strfreev(tokens);
if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
sr_err("Device context malloc failed.");
g_free(device);
return NULL;
}
devc->device = device;
sdi->priv = devc;
sdi->driver = di;
for (i = 0; i < 2; i++) {
if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE,
i == 0 ? "CH1" : "CH2")))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
}
drvc->instances = g_slist_append(drvc->instances, sdi);
devices = g_slist_append(devices, sdi);
}
g_dir_close(dir);
return devices;
}
static GSList *hw_dev_list(void)
{
struct drv_context *drvc;
drvc = di->priv;
return drvc->instances;
}
static int hw_dev_open(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int fd;
devc = sdi->priv;
if ((fd = open(devc->device, O_RDWR)) == -1)
return SR_ERR;
devc->fd = fd;
devc->scale = 1;
return SR_OK;
}
static int hw_dev_close(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
devc = sdi->priv;
close(devc->fd);
return SR_OK;
}
static int hw_cleanup(void)
{
clear_instances();
return SR_OK;
}
static int hw_info_get(int info_id, const void **data,
const struct sr_dev_inst *sdi)
{
(void)sdi;
switch (info_id) {
case SR_DI_HWCAPS:
*data = hwcaps;
break;
case SR_DI_NUM_PROBES:
*data = GINT_TO_POINTER(NUM_PROBES);
break;
case SR_DI_PROBE_NAMES:
*data = probe_names;
break;
case SR_DI_TIMEBASES:
*data = timebases;
break;
case SR_DI_TRIGGER_SOURCES:
*data = trigger_sources;
break;
case SR_DI_VDIVS:
*data = vdivs;
break;
case SR_DI_COUPLING:
*data = coupling;
break;
default:
sr_err("Unknown info_id: %d.", info_id);
return SR_ERR_ARG;
}
return SR_OK;
}
static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
const void *value)
{
struct dev_context *devc;
uint64_t tmp_u64;
float tmp_float;
struct sr_rational tmp_rat;
int ret, i, j;
char *channel;
devc = sdi->priv;
if (sdi->status != SR_ST_ACTIVE) {
sr_err("Device inactive, can't set config options.");
return SR_ERR;
}
ret = SR_OK;
switch (hwcap) {
case SR_HWCAP_LIMIT_FRAMES:
devc->limit_frames = *(const uint64_t *)value;
break;
case SR_HWCAP_TRIGGER_SLOPE:
tmp_u64 = *(const int *)value;
rigol_ds1xx2_send_data(devc->fd, ":TRIG:EDGE:SLOP %s\n",
tmp_u64 ? "POS" : "NEG");
break;
case SR_HWCAP_HORIZ_TRIGGERPOS:
tmp_float = *(const float *)value;
rigol_ds1xx2_send_data(devc->fd, ":TIM:OFFS %.9f\n", tmp_float);
break;
case SR_HWCAP_TIMEBASE:
tmp_rat = *(const struct sr_rational *)value;
rigol_ds1xx2_send_data(devc->fd, ":TIM:SCAL %.9f\n",
(float)tmp_rat.p / tmp_rat.q);
break;
case SR_HWCAP_TRIGGER_SOURCE:
if (!strcmp(value, "CH1"))
channel = "CHAN1";
else if (!strcmp(value, "CH2"))
channel = "CHAN2";
else if (!strcmp(value, "EXT"))
channel = "EXT";
else if (!strcmp(value, "AC Line"))
channel = "ACL";
else {
ret = SR_ERR_ARG;
break;
}
rigol_ds1xx2_send_data(devc->fd, ":TRIG:EDGE:SOUR %s\n", channel);
break;
case SR_HWCAP_VDIV:
/* TODO: Not supporting vdiv per channel yet. */
tmp_rat = *(const struct sr_rational *)value;
for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
if (vdivs[i].p == tmp_rat.p
&& vdivs[i].q == tmp_rat.q) {
devc->scale = (float)tmp_rat.p / tmp_rat.q;
for (j = 0; j < 2; j++)
rigol_ds1xx2_send_data(devc->fd,
":CHAN%d:SCAL %.3f\n", j, devc->scale);
break;
}
}
if (vdivs[i].p == 0 && vdivs[i].q == 0)
ret = SR_ERR_ARG;
break;
case SR_HWCAP_COUPLING:
/* TODO: Not supporting coupling per channel yet. */
for (i = 0; coupling[i]; i++) {
if (!strcmp(value, coupling[i])) {
for (j = 0; j < 2; j++)
rigol_ds1xx2_send_data(devc->fd,
":CHAN%d:COUP %s\n", j, coupling[i]);
break;
}
}
if (coupling[i] == 0)
ret = SR_ERR_ARG;
break;
default:
sr_err("Unknown hardware capability: %d.", hwcap);
ret = SR_ERR_ARG;
break;
}
return ret;
}
static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_header header;
struct sr_datafeed_meta_analog meta;
char buf[256];
int len;
(void)cb_data;
devc = sdi->priv;
devc->num_frames = 0;
sr_source_add(devc->fd, G_IO_IN, 50, rigol_ds1xx2_receive_data, (void *)sdi);
/* Send header packet to the session bus. */
packet.type = SR_DF_HEADER;
packet.payload = (unsigned char *)&header;
header.feed_version = 1;
gettimeofday(&header.starttime, NULL);
sr_session_send(cb_data, &packet);
/* Send metadata about the SR_DF_ANALOG packets to come. */
packet.type = SR_DF_META_ANALOG;
packet.payload = &meta;
meta.num_probes = NUM_PROBES;
sr_session_send(cb_data, &packet);
rigol_ds1xx2_send_data(devc->fd, ":CHAN1:SCAL?\n");
len = read(devc->fd, buf, sizeof(buf));
buf[len] = 0;
devc->scale = atof(buf);
sr_dbg("Scale is %.3f.", devc->scale);
rigol_ds1xx2_send_data(devc->fd, ":CHAN1:OFFS?\n");
len = read(devc->fd, buf, sizeof(buf));
buf[len] = 0;
devc->offset = atof(buf);
sr_dbg("Offset is %.6f.", devc->offset);
rigol_ds1xx2_send_data(devc->fd, ":WAV:DATA?\n");
return SR_OK;
}
static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *devc;
(void)cb_data;
devc = sdi->priv;
if (sdi->status != SR_ST_ACTIVE) {
sr_err("Device inactive, can't stop acquisition.");
return SR_ERR;
}
sr_source_remove(devc->fd);
return SR_OK;
}
SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info = {
.name = "rigol-ds1xx2",
.longname = "Rigol DS1xx2",
.api_version = 1,
.init = hw_init,
.cleanup = hw_cleanup,
.scan = hw_scan,
.dev_list = hw_dev_list,
.dev_clear = clear_instances,
.dev_open = hw_dev_open,
.dev_close = hw_dev_close,
.info_get = hw_info_get,
.dev_config_set = hw_dev_config_set,
.dev_acquisition_start = hw_dev_acquisition_start,
.dev_acquisition_stop = hw_dev_acquisition_stop,
.priv = NULL,
};
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