libsigrok/hardware/common/scpi_visa.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 Martin Ling <martin-sigrok@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 "libsigrok.h"
#include "libsigrok-internal.h"
#include <visa.h>
#include <string.h>
#define LOG_PREFIX "scpi_visa"
struct scpi_visa {
char *resource;
ViSession rmgr;
ViSession vi;
};
static int scpi_visa_dev_inst_new(void *priv, struct drv_context *drvc,
const char *resource, char **params, const char *serialcomm)
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{
struct scpi_visa *vscpi = priv;
(void)drvc;
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(void)resource;
(void)serialcomm;
if (!params || !params[1]) {
sr_err("Invalid parameters.");
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return SR_ERR_BUG;
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}
vscpi->resource = g_strdup(params[1]);
return SR_OK;
}
static int scpi_visa_open(void *priv)
{
struct scpi_visa *vscpi = priv;
if (viOpenDefaultRM(&vscpi->rmgr) != VI_SUCCESS) {
sr_err("Cannot open default resource manager.");
return SR_ERR;
}
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if (viOpen(vscpi->rmgr, vscpi->resource, VI_NO_LOCK, 0, &vscpi->vi) != VI_SUCCESS) {
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sr_err("Cannot open resource.");
return SR_ERR;
}
return SR_OK;
}
static int scpi_visa_source_add(void *priv, int events, int timeout,
sr_receive_data_callback cb, void *cb_data)
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{
(void) priv;
/* Hook up a dummy handler to receive data from the device. */
return sr_source_add(-1, events, timeout, cb, cb_data);
}
static int scpi_visa_source_remove(void *priv)
{
(void) priv;
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return sr_source_remove(-1);
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}
static int scpi_visa_send(void *priv, const char *command)
{
struct scpi_visa *vscpi = priv;
gchar *terminated_command;
ViUInt32 written = 0;
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int len;
terminated_command = g_strconcat(command, "\n", NULL);
len = strlen(terminated_command);
if (viWrite(vscpi->vi, (ViBuf) (terminated_command + written), len,
&written) != VI_SUCCESS) {
sr_err("Error while sending SCPI command: '%s'.", command);
g_free(terminated_command);
return SR_ERR;
}
g_free(terminated_command);
sr_spew("Successfully sent SCPI command: '%s'.", command);
return SR_OK;
}
static int scpi_visa_read_begin(void *priv)
{
(void) priv;
return SR_OK;
}
static int scpi_visa_read_data(void *priv, char *buf, int maxlen)
{
struct scpi_visa *vscpi = priv;
ViUInt32 count;
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if (viRead(vscpi->vi, (ViBuf) buf, maxlen, &count) != VI_SUCCESS) {
sr_err("Read failed.");
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return SR_ERR;
}
return count;
}
static int scpi_visa_read_complete(void *priv)
{
struct scpi_visa *vscpi = priv;
ViUInt16 status;
if (viReadSTB(vscpi->vi, &status) != VI_SUCCESS) {
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sr_err("Failed to read status.");
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return SR_ERR;
}
return !(status & 16);
}
static int scpi_visa_close(void *priv)
{
struct scpi_visa *vscpi = priv;
viClose(vscpi->vi);
viClose(vscpi->rmgr);
return SR_OK;
}
static void scpi_visa_free(void *priv)
{
struct scpi_visa *vscpi = priv;
g_free(vscpi->resource);
g_free(vscpi);
}
SR_PRIV const struct sr_scpi_dev_inst scpi_visa_dev = {
.name = "VISA",
.prefix = "visa",
.priv_size = sizeof(struct scpi_visa),
.dev_inst_new = scpi_visa_dev_inst_new,
.open = scpi_visa_open,
.source_add = scpi_visa_source_add,
.source_remove = scpi_visa_source_remove,
.send = scpi_visa_send,
.read_begin = scpi_visa_read_begin,
.read_data = scpi_visa_read_data,
.read_complete = scpi_visa_read_complete,
.close = scpi_visa_close,
.free = scpi_visa_free,
};