Add librevisa SCPI backend.

[libsigrok.git] / hardware / common / scpi_visa.c

diff --git a/hardware/common/scpi_visa.c b/hardware/common/scpi_visa.c
new file mode 100644 (file)
index 0000000..07d4b9a
--- /dev/null
+++ b/hardware/common/scpi_visa.c
@@ -0,0 +1,175 @@
+/*
+ * 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, const char *resource,
+               char **params, const char *serialcomm)
+{
+       struct scpi_visa *vscpi = priv;
+
+       (void)resource;
+       (void)serialcomm;
+
+       if (!params || !params[1]) {
+               sr_err("Invalid parameters.");
+               return SR_ERR;
+       }
+
+       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;
+       }
+
+       if (viOpen(vscpi->rmgr, vscpi->resource, VI_NO_LOCK, 0, &vscpi->vi) != VI_SUCCESS)
+       {
+               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_t cb, void *cb_data)
+{
+       (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;
+
+       return sr_source_remove(-1);;
+}
+
+static int scpi_visa_send(void *priv, const char *command)
+{
+       struct scpi_visa *vscpi = priv;
+       gchar *terminated_command;
+       ViUInt32 written;
+       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;
+
+       if (viRead(vscpi->vi, (ViBuf) buf, maxlen, &count) != VI_SUCCESS)
+       {
+               sr_err("Read failed");
+               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) {
+               sr_err("Failed to read status");
+               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,
+};