239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
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*
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* Inspired by the VXI11 Ethernet Protocol for Linux:
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* http://optics.eee.nottingham.ac.uk/vxi11/
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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 <rpc/rpc.h>
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#include <string.h>
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#include "vxi.h"
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#define LOG_PREFIX "scpi_vxi"
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#define VXI_DEFAULT_TIMEOUT 2000 /* in ms */
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struct scpi_vxi {
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char *address;
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char *instrument;
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CLIENT *client;
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Device_Link link;
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unsigned int max_send_size;
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unsigned int read_complete;
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};
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static int scpi_vxi_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_vxi *vxi = 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;
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}
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vxi->address = g_strdup(params[1]);
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vxi->instrument = g_strdup(params[2] ? params[2] : "inst0");
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return SR_OK;
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}
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static int scpi_vxi_open(void *priv)
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{
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struct scpi_vxi *vxi = priv;
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Create_LinkParms link_parms;
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Create_LinkResp *link_resp;
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vxi->client = clnt_create(vxi->address, DEVICE_CORE, DEVICE_CORE_VERSION, "tcp");
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if (vxi->client == NULL) {
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sr_err("Client creation failed for %s", vxi->address);
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return SR_ERR;
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}
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/* Set link parameters */
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link_parms.clientId = (long) vxi->client;
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link_parms.lockDevice = 0;
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link_parms.lock_timeout = VXI_DEFAULT_TIMEOUT;
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link_parms.device = "inst0";
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if (!(link_resp = create_link_1(&link_parms, vxi->client))) {
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sr_err("Link creation failed for %s", vxi->address);
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return SR_ERR;
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}
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vxi->link = link_resp->lid;
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vxi->max_send_size = link_resp->maxRecvSize;
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/* Set a default maxRecvSize for devices which do not specify it */
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if (vxi->max_send_size <= 0)
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vxi->max_send_size = 4096;
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return SR_OK;
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}
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static int scpi_vxi_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_vxi_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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/* Operation Flags */
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#define DF_WAITLOCK 0x01 /* wait if the operation is locked by another link */
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#define DF_END 0x08 /* an END indicator is sent with last byte of buffer */
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#define DF_TERM 0x80 /* a termination char is set during a read */
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static int scpi_vxi_send(void *priv, const char *command)
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{
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struct scpi_vxi *vxi = priv;
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Device_WriteResp *write_resp;
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Device_WriteParms write_parms;
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char *terminated_command;
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unsigned int len;
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terminated_command = g_strdup_printf("%s\r\n", command);
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len = strlen(terminated_command);
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write_parms.lid = vxi->link;
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write_parms.io_timeout = VXI_DEFAULT_TIMEOUT;
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write_parms.lock_timeout = VXI_DEFAULT_TIMEOUT;
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write_parms.flags = DF_END;
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write_parms.data.data_len = MIN(len, vxi->max_send_size);
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write_parms.data.data_val = terminated_command;
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if (!(write_resp = device_write_1(&write_parms, vxi->client))
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|| write_resp->error) {
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sr_err("Device write failed for %s with error %d",
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vxi->address, write_resp->error);
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return SR_ERR;
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}
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g_free(terminated_command);
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if (write_resp->size < len)
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sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.",
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write_resp->size, len, command);
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else
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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_vxi_read_begin(void *priv)
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{
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struct scpi_vxi *vxi = priv;
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vxi->read_complete = 0;
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return SR_OK;
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}
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/* Read Response Reason Flags */
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#define RRR_SIZE 0x01 /* requestSize bytes have been transferred */
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#define RRR_TERM 0x02 /* a termination char has been read */
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#define RRR_END 0x04 /* an END indicator has been read */
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static int scpi_vxi_read_data(void *priv, char *buf, int maxlen)
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{
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struct scpi_vxi *vxi = priv;
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Device_ReadParms read_parms;
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Device_ReadResp *read_resp;
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read_parms.lid = vxi->link;
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read_parms.io_timeout = VXI_DEFAULT_TIMEOUT;
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read_parms.lock_timeout = VXI_DEFAULT_TIMEOUT;
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read_parms.flags = 0;
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read_parms.termChar = 0;
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read_parms.requestSize = maxlen;
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if (!(read_resp = device_read_1(&read_parms, vxi->client))
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|| read_resp->error) {
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sr_err("Device read failed for %s with error %d",
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vxi->address, read_resp->error);
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return SR_ERR;
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}
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memcpy(buf, read_resp->data.data_val, read_resp->data.data_len);
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vxi->read_complete = read_resp->reason & (RRR_SIZE | RRR_TERM | RRR_END);
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return read_resp->data.data_len; /* actual number of bytes received */
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}
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static int scpi_vxi_read_complete(void *priv)
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{
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struct scpi_vxi *vxi = priv;
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return vxi->read_complete;
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}
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static int scpi_vxi_close(void *priv)
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{
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struct scpi_vxi *vxi = priv;
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Device_Error *dev_error;
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if (!vxi->client)
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return SR_ERR;
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if (!(dev_error = destroy_link_1(&vxi->link, vxi->client))) {
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sr_err("Link destruction failed for %s", vxi->address);
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return SR_ERR;
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}
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clnt_destroy(vxi->client);
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vxi->client = NULL;
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return SR_OK;
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}
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static void scpi_vxi_free(void *priv)
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{
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struct scpi_vxi *vxi = priv;
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g_free(vxi->address);
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g_free(vxi->instrument);
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}
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SR_PRIV const struct sr_scpi_dev_inst scpi_vxi_dev = {
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.name = "VXI",
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.prefix = "vxi",
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.priv_size = sizeof(struct scpi_vxi),
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.dev_inst_new = scpi_vxi_dev_inst_new,
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.open = scpi_vxi_open,
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.source_add = scpi_vxi_source_add,
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.source_remove = scpi_vxi_source_remove,
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.send = scpi_vxi_send,
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.read_begin = scpi_vxi_read_begin,
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.read_data = scpi_vxi_read_data,
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.read_complete = scpi_vxi_read_complete,
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.close = scpi_vxi_close,
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.free = scpi_vxi_free,
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};
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