169 lines
3.9 KiB
C
169 lines
3.9 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 <glib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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/* Message logging helpers with subsystem-specific prefix string. */
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#define LOG_PREFIX "scpi_usbtmc: "
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#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
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#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
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#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
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#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
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#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
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SR_PRIV int scpi_usbtmc_open(void *priv)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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if ((usbtmc->fd = open(usbtmc->device, O_RDWR)) < 0)
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return SR_ERR;
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return SR_OK;
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}
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SR_PRIV int scpi_usbtmc_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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struct sr_usbtmc_dev_inst *usbtmc = priv;
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return sr_source_add(usbtmc->fd, events, timeout, cb, cb_data);
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}
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SR_PRIV int scpi_usbtmc_source_remove(void *priv)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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return sr_source_remove(usbtmc->fd);
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}
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SR_PRIV int scpi_usbtmc_send(void *priv, const char *command)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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int len, out;
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len = strlen(command);
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out = write(usbtmc->fd, command, len);
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if (out < 0) {
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sr_err("Write error: %s", strerror(errno));
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return SR_ERR;
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}
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if (out < len) {
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sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out,
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len, command);
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}
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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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SR_PRIV int scpi_usbtmc_receive(void *priv, char **scpi_response)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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GString *response;
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char buf[256];
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int len;
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response = g_string_sized_new(1024);
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len = read(usbtmc->fd, buf, sizeof(buf));
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if (len < 0) {
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sr_err("Read error: %s", strerror(errno));
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g_string_free(response, TRUE);
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return SR_ERR;
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}
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response = g_string_append_len(response, buf, len);
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*scpi_response = response->str;
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sr_dbg("SCPI response received (length %d): '%.50s'",
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response->len, response->str);
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g_string_free(response, FALSE);
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return SR_OK;
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}
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SR_PRIV int scpi_usbtmc_read(void *priv, char *buf, int maxlen)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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int len;
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len = read(usbtmc->fd, buf, maxlen);
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if (len < 0) {
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sr_err("Read error: %s", strerror(errno));
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return SR_ERR;
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}
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return len;
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}
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SR_PRIV int scpi_usbtmc_close(void *priv)
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{
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struct sr_usbtmc_dev_inst *usbtmc = priv;
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if (close(usbtmc->fd) < 0)
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return SR_ERR;
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return SR_OK;
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}
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static void scpi_usbtmc_free(void *priv)
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{
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return sr_usbtmc_dev_inst_free(priv);
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}
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SR_PRIV struct sr_scpi_dev_inst *scpi_usbtmc_dev_inst_new(const char *device)
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{
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struct sr_scpi_dev_inst *scpi;
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struct sr_usbtmc_dev_inst *usbtmc;
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scpi = g_try_malloc(sizeof(struct sr_scpi_dev_inst));
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if (!(usbtmc = sr_usbtmc_dev_inst_new(device)))
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{
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g_free(scpi);
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return NULL;
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}
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scpi->open = scpi_usbtmc_open;
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scpi->source_add = scpi_usbtmc_source_add;
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scpi->source_remove = scpi_usbtmc_source_remove;
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scpi->send = scpi_usbtmc_send;
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scpi->receive = scpi_usbtmc_receive;
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scpi->read = scpi_usbtmc_read;
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scpi->close = scpi_usbtmc_close;
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scpi->free = scpi_usbtmc_free;
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scpi->priv = usbtmc;
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return scpi;
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}
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