libsigrok/hardware/common/scpi.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
*
* 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 <glib.h>
#include <string.h>
#define LOG_PREFIX "scpi"
#define SCPI_READ_RETRIES 100
#define SCPI_READ_RETRY_TIMEOUT 10000
/**
* Parse a string representation of a boolean-like value into a gboolean.
* Similar to sr_parse_boolstring but rejects strings which do not represent
* a boolean-like value.
*
* @param str String to convert.
* @param ret Pointer to a gboolean where the result of the conversion will be
* stored.
*
* @return SR_OK on success, SR_ERR on failure.
*/
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static int parse_strict_bool(const char *str, gboolean *ret)
{
if (!str)
return SR_ERR_ARG;
if (!g_strcmp0(str, "1") ||
!g_ascii_strncasecmp(str, "y", 1) ||
!g_ascii_strncasecmp(str, "t", 1) ||
!g_ascii_strncasecmp(str, "yes", 3) ||
!g_ascii_strncasecmp(str, "true", 4) ||
!g_ascii_strncasecmp(str, "on", 2)) {
*ret = TRUE;
return SR_OK;
} else if (!g_strcmp0(str, "0") ||
!g_ascii_strncasecmp(str, "n", 1) ||
!g_ascii_strncasecmp(str, "f", 1) ||
!g_ascii_strncasecmp(str, "no", 2) ||
!g_ascii_strncasecmp(str, "false", 5) ||
!g_ascii_strncasecmp(str, "off", 3)) {
*ret = FALSE;
return SR_OK;
}
return SR_ERR;
}
SR_PRIV extern const struct sr_scpi_dev_inst scpi_serial_dev;
SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_raw_dev;
SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_rigol_dev;
SR_PRIV extern const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev;
SR_PRIV extern const struct sr_scpi_dev_inst scpi_vxi_dev;
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SR_PRIV extern const struct sr_scpi_dev_inst scpi_visa_dev;
static const struct sr_scpi_dev_inst *scpi_devs[] = {
&scpi_tcp_raw_dev,
&scpi_tcp_rigol_dev,
#ifdef HAVE_LIBUSB_1_0
&scpi_usbtmc_libusb_dev,
#endif
#if HAVE_RPC
&scpi_vxi_dev,
#endif
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#ifdef HAVE_LIBREVISA
&scpi_visa_dev,
#endif
#ifdef HAVE_LIBSERIALPORT
&scpi_serial_dev, /* must be last as it matches any resource */
#endif
};
static GSList *sr_scpi_scan_resource(struct drv_context *drvc,
const char *resource, const char *serialcomm,
struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
{
struct sr_scpi_dev_inst *scpi;
struct sr_dev_inst *sdi;
if (!(scpi = scpi_dev_inst_new(drvc, resource, serialcomm)))
return NULL;
if (sr_scpi_open(scpi) != SR_OK) {
sr_info("Couldn't open SCPI device.");
sr_scpi_free(scpi);
return NULL;
};
if ((sdi = probe_device(scpi)))
return g_slist_append(NULL, sdi);
sr_scpi_close(scpi);
sr_scpi_free(scpi);
return NULL;
}
SR_PRIV GSList *sr_scpi_scan(struct drv_context *drvc, GSList *options,
struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
{
GSList *resources, *l, *d, *devices = NULL;
const char *resource = NULL;
const char *serialcomm = NULL;
gchar **res;
unsigned i;
for (l = options; l; l = l->next) {
struct sr_config *src = l->data;
switch (src->key) {
case SR_CONF_CONN:
resource = g_variant_get_string(src->data, NULL);
break;
case SR_CONF_SERIALCOMM:
serialcomm = g_variant_get_string(src->data, NULL);
break;
}
}
for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
if ((resource && strcmp(resource, scpi_devs[i]->prefix))
|| !scpi_devs[i]->scan)
continue;
resources = scpi_devs[i]->scan(drvc);
for (l = resources; l; l = l->next) {
res = g_strsplit(l->data, ":", 2);
if (res[0] && (d = sr_scpi_scan_resource(drvc, res[0],
serialcomm ? serialcomm : res[1], probe_device)))
devices = g_slist_concat(devices, d);
g_strfreev(res);
}
g_slist_free_full(resources, g_free);
}
if (!devices && resource)
devices = sr_scpi_scan_resource(drvc, resource, serialcomm,
probe_device);
/* Tack a copy of the newly found devices onto the driver list. */
if (devices)
drvc->instances = g_slist_concat(drvc->instances,
g_slist_copy(devices));
return devices;
}
SR_PRIV struct sr_scpi_dev_inst *scpi_dev_inst_new(struct drv_context *drvc,
const char *resource, const char *serialcomm)
{
struct sr_scpi_dev_inst *scpi = NULL;
const struct sr_scpi_dev_inst *scpi_dev;
gchar **params;
unsigned i;
for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
scpi_dev = scpi_devs[i];
if (!strncmp(resource, scpi_dev->prefix, strlen(scpi_dev->prefix))) {
sr_dbg("Opening %s device %s.", scpi_dev->name, resource);
scpi = g_malloc(sizeof(*scpi));
*scpi = *scpi_dev;
scpi->priv = g_malloc0(scpi->priv_size);
params = g_strsplit(resource, "/", 0);
if (scpi->dev_inst_new(scpi->priv, drvc, resource,
params, serialcomm) != SR_OK) {
sr_scpi_free(scpi);
scpi = NULL;
}
g_strfreev(params);
break;
}
}
return scpi;
}
/**
* Open SCPI device.
*
* @param scpi Previously initialized SCPI device structure.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_open(struct sr_scpi_dev_inst *scpi)
{
return scpi->open(scpi->priv);
}
/**
* Add an event source for an SCPI device.
*
* @param scpi Previously initialized SCPI device structure.
* @param events Events to check for.
* @param timeout Max time to wait before the callback is called, ignored if 0.
* @param cb Callback function to add. Must not be NULL.
* @param cb_data Data for the callback function. Can be NULL.
*
* @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
* SR_ERR_MALLOC upon memory allocation errors.
*/
SR_PRIV int sr_scpi_source_add(struct sr_scpi_dev_inst *scpi, int events,
int timeout, sr_receive_data_callback cb, void *cb_data)
{
return scpi->source_add(scpi->priv, events, timeout, cb, cb_data);
}
/**
* Remove event source for an SCPI device.
*
* @param scpi Previously initialized SCPI device structure.
*
* @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
* SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
* internal errors.
*/
SR_PRIV int sr_scpi_source_remove(struct sr_scpi_dev_inst *scpi)
{
return scpi->source_remove(scpi->priv);
}
/**
* Send a SCPI command.
*
* @param scpi Previously initialized SCPI device structure.
* @param format Format string, to be followed by any necessary arguments.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_send(struct sr_scpi_dev_inst *scpi,
const char *format, ...)
{
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va_list args;
int ret;
va_start(args, format);
ret = sr_scpi_send_variadic(scpi, format, args);
va_end(args);
return ret;
}
/**
* Send a SCPI command with a variadic argument list.
*
* @param scpi Previously initialized SCPI device structure.
* @param format Format string.
* @param args Argument list.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_send_variadic(struct sr_scpi_dev_inst *scpi,
const char *format, va_list args)
{
va_list args_copy;
char *buf;
int len, ret;
/* Get length of buffer required. */
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va_copy(args_copy, args);
len = vsnprintf(NULL, 0, format, args_copy);
va_end(args_copy);
/* Allocate buffer and write out command. */
buf = g_malloc(len + 1);
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vsprintf(buf, format, args);
/* Send command. */
ret = scpi->send(scpi->priv, buf);
/* Free command buffer. */
g_free(buf);
return ret;
}
/**
* Begin receiving an SCPI reply.
*
* @param scpi Previously initialised SCPI device structure.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_read_begin(struct sr_scpi_dev_inst *scpi)
{
return scpi->read_begin(scpi->priv);
}
/**
* Read part of a response from SCPI device.
*
* @param scpi Previously initialised SCPI device structure.
* @param buf Buffer to store result.
* @param maxlen Maximum number of bytes to read.
*
* @return Number of bytes read, or SR_ERR upon failure.
*/
SR_PRIV int sr_scpi_read_data(struct sr_scpi_dev_inst *scpi,
char *buf, int maxlen)
{
return scpi->read_data(scpi->priv, buf, maxlen);
}
/**
* Check whether a complete SCPI response has been received.
*
* @param scpi Previously initialised SCPI device structure.
*
* @return 1 if complete, 0 otherwise.
*/
SR_PRIV int sr_scpi_read_complete(struct sr_scpi_dev_inst *scpi)
{
return scpi->read_complete(scpi->priv);
}
/**
* Close SCPI device.
*
* @param scpi Previously initialized SCPI device structure.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_close(struct sr_scpi_dev_inst *scpi)
{
return scpi->close(scpi->priv);
}
/**
* Free SCPI device.
*
* @param scpi Previously initialized SCPI device structure.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV void sr_scpi_free(struct sr_scpi_dev_inst *scpi)
{
scpi->free(scpi->priv);
g_free(scpi->priv);
g_free(scpi);
}
/**
* Send a SCPI command, receive the reply and store the reply in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
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* @param scpi_response Pointer where to store the SCPI response.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
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const char *command, char **scpi_response)
{
char buf[256];
int len;
GString *response;
if (command)
if (sr_scpi_send(scpi, command) != SR_OK)
return SR_ERR;
if (sr_scpi_read_begin(scpi) != SR_OK)
return SR_ERR;
response = g_string_new("");
*scpi_response = NULL;
while (!sr_scpi_read_complete(scpi)) {
len = sr_scpi_read_data(scpi, buf, sizeof(buf));
if (len < 0) {
g_string_free(response, TRUE);
return SR_ERR;
}
g_string_append_len(response, buf, len);
}
/* Get rid of trailing linefeed if present */
if (response->len >= 1 && response->str[response->len - 1] == '\n')
g_string_truncate(response, response->len - 1);
*scpi_response = response->str;
g_string_free(response, FALSE);
sr_spew("Got response: '%.70s'.", *scpi_response);
return SR_OK;
}
/**
* Send a SCPI command, read the reply, parse it as a bool value and store the
* result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_bool(struct sr_scpi_dev_inst *scpi,
const char *command, gboolean *scpi_response)
{
int ret;
char *response;
response = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
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if (parse_strict_bool(response, scpi_response) == SR_OK)
ret = SR_OK;
else
ret = SR_ERR;
g_free(response);
return ret;
}
/**
* Send a SCPI command, read the reply, parse it as an integer and store the
* result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_int(struct sr_scpi_dev_inst *scpi,
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const char *command, int *scpi_response)
{
int ret;
char *response;
response = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
if (sr_atoi(response, scpi_response) == SR_OK)
ret = SR_OK;
else
ret = SR_ERR;
g_free(response);
return ret;
}
/**
* Send a SCPI command, read the reply, parse it as a float and store the
* result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_float(struct sr_scpi_dev_inst *scpi,
const char *command, float *scpi_response)
{
int ret;
char *response;
response = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
if (sr_atof_ascii(response, scpi_response) == SR_OK)
ret = SR_OK;
else
ret = SR_ERR;
g_free(response);
return ret;
}
/**
* Send a SCPI command, read the reply, parse it as a double and store the
* result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_double(struct sr_scpi_dev_inst *scpi,
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const char *command, double *scpi_response)
{
int ret;
char *response;
response = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
if (sr_atod(response, scpi_response) == SR_OK)
ret = SR_OK;
else
ret = SR_ERR;
g_free(response);
return ret;
}
/**
* Send a SCPI *OPC? command, read the reply and return the result of the
* command.
*
* @param scpi Previously initialised SCPI device structure.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_opc(struct sr_scpi_dev_inst *scpi)
{
unsigned int i;
gboolean opc;
for (i = 0; i < SCPI_READ_RETRIES; ++i) {
sr_scpi_get_bool(scpi, SCPI_CMD_OPC, &opc);
if (opc)
return SR_OK;
g_usleep(SCPI_READ_RETRY_TIMEOUT);
}
return SR_ERR;
}
/**
* Send a SCPI command, read the reply, parse it as comma separated list of
* floats and store the as an result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK upon successfully parsing all values, SR_ERR upon a parsing
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* error or upon no response. The allocated response must be freed by
* the caller in the case of an SR_OK as well as in the case of
* parsing error.
*/
SR_PRIV int sr_scpi_get_floatv(struct sr_scpi_dev_inst *scpi,
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const char *command, GArray **scpi_response)
{
int ret;
float tmp;
char *response;
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gchar **ptr, **tokens;
GArray *response_array;
ret = SR_OK;
response = NULL;
tokens = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
tokens = g_strsplit(response, ",", 0);
ptr = tokens;
response_array = g_array_sized_new(TRUE, FALSE, sizeof(float), 256);
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while (*ptr) {
if (sr_atof_ascii(*ptr, &tmp) == SR_OK)
response_array = g_array_append_val(response_array,
tmp);
else
ret = SR_ERR;
ptr++;
}
g_strfreev(tokens);
g_free(response);
if (ret == SR_ERR && response_array->len == 0) {
g_array_free(response_array, TRUE);
*scpi_response = NULL;
return SR_ERR;
}
*scpi_response = response_array;
return ret;
}
/**
* Send a SCPI command, read the reply, parse it as comma separated list of
* unsigned 8 bit integers and store the as an result in scpi_response.
*
* @param scpi Previously initialised SCPI device structure.
* @param command The SCPI command to send to the device (can be NULL).
* @param scpi_response Pointer where to store the parsed result.
*
* @return SR_OK upon successfully parsing all values, SR_ERR upon a parsing
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* error or upon no response. The allocated response must be freed by
* the caller in the case of an SR_OK as well as in the case of
* parsing error.
*/
SR_PRIV int sr_scpi_get_uint8v(struct sr_scpi_dev_inst *scpi,
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const char *command, GArray **scpi_response)
{
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int tmp, ret;
char *response;
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gchar **ptr, **tokens;
GArray *response_array;
ret = SR_OK;
response = NULL;
tokens = NULL;
if (sr_scpi_get_string(scpi, command, &response) != SR_OK)
if (!response)
return SR_ERR;
tokens = g_strsplit(response, ",", 0);
ptr = tokens;
response_array = g_array_sized_new(TRUE, FALSE, sizeof(uint8_t), 256);
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while (*ptr) {
if (sr_atoi(*ptr, &tmp) == SR_OK)
response_array = g_array_append_val(response_array,
tmp);
else
ret = SR_ERR;
ptr++;
}
g_strfreev(tokens);
g_free(response);
if (response_array->len == 0) {
g_array_free(response_array, TRUE);
*scpi_response = NULL;
return SR_ERR;
}
*scpi_response = response_array;
return ret;
}
/**
* Send the *IDN? SCPI command, receive the reply, parse it and store the
* reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer.
*
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* The hw_info structure must be freed by the caller via sr_scpi_hw_info_free().
*
* @param scpi Previously initialised SCPI device structure.
* @param scpi_response Pointer where to store the hw_info structure.
*
* @return SR_OK upon success, SR_ERR on failure.
*/
SR_PRIV int sr_scpi_get_hw_id(struct sr_scpi_dev_inst *scpi,
struct sr_scpi_hw_info **scpi_response)
{
int num_tokens;
char *response;
gchar **tokens;
struct sr_scpi_hw_info *hw_info;
response = NULL;
tokens = NULL;
if (sr_scpi_get_string(scpi, SCPI_CMD_IDN, &response) != SR_OK)
if (!response)
return SR_ERR;
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sr_info("Got IDN string: '%s'", response);
/*
* The response to a '*IDN?' is specified by the SCPI spec. It contains
* a comma-separated list containing the manufacturer name, instrument
* model, serial number of the instrument and the firmware version.
*/
tokens = g_strsplit(response, ",", 0);
for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
if (num_tokens != 4) {
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sr_dbg("IDN response not according to spec: %80.s.", response);
g_strfreev(tokens);
g_free(response);
return SR_ERR;
}
g_free(response);
hw_info = g_try_malloc(sizeof(struct sr_scpi_hw_info));
if (!hw_info) {
g_strfreev(tokens);
return SR_ERR_MALLOC;
}
hw_info->manufacturer = g_strdup(tokens[0]);
hw_info->model = g_strdup(tokens[1]);
hw_info->serial_number = g_strdup(tokens[2]);
hw_info->firmware_version = g_strdup(tokens[3]);
g_strfreev(tokens);
*scpi_response = hw_info;
return SR_OK;
}
/**
* Free a sr_scpi_hw_info struct.
*
* @param hw_info Pointer to the struct to free.
*
* This function is safe to call with a NULL pointer.
*/
SR_PRIV void sr_scpi_hw_info_free(struct sr_scpi_hw_info *hw_info)
{
if (hw_info) {
g_free(hw_info->manufacturer);
g_free(hw_info->model);
g_free(hw_info->serial_number);
g_free(hw_info->firmware_version);
g_free(hw_info);
}
}