175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include <visa.h>
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#include <string.h>
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#define LOG_PREFIX "scpi_visa"
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struct scpi_visa {
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char *resource;
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ViSession rmgr;
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ViSession vi;
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};
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static int scpi_visa_dev_inst_new(void *priv, struct drv_context *drvc,
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const char *resource, char **params, const char *serialcomm)
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{
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struct scpi_visa *vscpi = priv;
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(void)drvc;
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(void)resource;
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(void)serialcomm;
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if (!params || !params[1]) {
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sr_err("Invalid parameters.");
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return SR_ERR_BUG;
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}
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vscpi->resource = g_strdup(params[1]);
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return SR_OK;
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}
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static int scpi_visa_open(void *priv)
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{
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struct scpi_visa *vscpi = priv;
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if (viOpenDefaultRM(&vscpi->rmgr) != VI_SUCCESS) {
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sr_err("Cannot open default resource manager.");
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return SR_ERR;
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}
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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.");
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return SR_ERR;
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}
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return SR_OK;
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}
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static int scpi_visa_source_add(void *priv, int events, int timeout,
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sr_receive_data_callback_t cb, void *cb_data)
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{
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(void) priv;
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/* Hook up a dummy handler to receive data from the device. */
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return sr_source_add(-1, events, timeout, cb, cb_data);
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}
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static int scpi_visa_source_remove(void *priv)
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{
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(void) priv;
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return sr_source_remove(-1);
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}
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static int scpi_visa_send(void *priv, const char *command)
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{
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struct scpi_visa *vscpi = priv;
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gchar *terminated_command;
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ViUInt32 written = 0;
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int len;
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terminated_command = g_strconcat(command, "\n", NULL);
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len = strlen(terminated_command);
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if (viWrite(vscpi->vi, (ViBuf) (terminated_command + written), len,
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&written) != VI_SUCCESS) {
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sr_err("Error while sending SCPI command: '%s'.", command);
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g_free(terminated_command);
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return SR_ERR;
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}
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g_free(terminated_command);
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sr_spew("Successfully sent SCPI command: '%s'.", command);
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return SR_OK;
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}
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static int scpi_visa_read_begin(void *priv)
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{
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(void) priv;
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return SR_OK;
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}
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static int scpi_visa_read_data(void *priv, char *buf, int maxlen)
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{
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struct scpi_visa *vscpi = priv;
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ViUInt32 count;
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if (viRead(vscpi->vi, (ViBuf) buf, maxlen, &count) != VI_SUCCESS) {
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sr_err("Read failed.");
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return SR_ERR;
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}
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return count;
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}
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static int scpi_visa_read_complete(void *priv)
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{
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struct scpi_visa *vscpi = priv;
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ViUInt16 status;
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if (viReadSTB(vscpi->vi, &status) != VI_SUCCESS) {
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sr_err("Failed to read status.");
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return SR_ERR;
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}
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return !(status & 16);
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}
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static int scpi_visa_close(void *priv)
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{
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struct scpi_visa *vscpi = priv;
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viClose(vscpi->vi);
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viClose(vscpi->rmgr);
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return SR_OK;
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}
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static void scpi_visa_free(void *priv)
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{
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struct scpi_visa *vscpi = priv;
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g_free(vscpi->resource);
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g_free(vscpi);
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}
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SR_PRIV const struct sr_scpi_dev_inst scpi_visa_dev = {
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.name = "VISA",
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.prefix = "visa",
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.priv_size = sizeof(struct scpi_visa),
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.dev_inst_new = scpi_visa_dev_inst_new,
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.open = scpi_visa_open,
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.source_add = scpi_visa_source_add,
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.source_remove = scpi_visa_source_remove,
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.send = scpi_visa_send,
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.read_begin = scpi_visa_read_begin,
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.read_data = scpi_visa_read_data,
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.read_complete = scpi_visa_read_complete,
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.close = scpi_visa_close,
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.free = scpi_visa_free,
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};
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