* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+/*
+ * This sigrok driver implementation uses the vendor's CLI application
+ * for the ASIX OMEGA to operate the device in real time mode. The
+ * external process handles the device detection, USB communication
+ * (FTDI FIFO), FPGA netlist download, and device control. The process'
+ * stdout provides a continuous RLE compressed stream of 16bit samples
+ * taken at 200MHz.
+ *
+ * Known limitations: The samplerate is fixed. Hardware triggers are not
+ * available in this mode. The start of the acquisition takes a few
+ * seconds, but the device's native protocol is unknown and its firmware
+ * is unavailable, so that a native sigrok driver is in some distant
+ * future. Users need to initiate the acquisition in sigrok early so
+ * that the device is capturing when the event of interest happens.
+ *
+ * The vendor application's executable either must be named omegartmcli
+ * and must be found in PATH, or the OMEGARTMCLI environment variable
+ * must contain its location. A scan option could be used when a
+ * suitable SR_CONF key gets identified which communicates executable
+ * locations.
+ *
+ * When multiple devices are connected, then a conn=sn=... specification
+ * can select one of the devices. The serial number should contain six
+ * or eight hex digits (this follows the vendor's approach for the CLI
+ * application).
+ */
+
+/*
+ * Implementor's notes. Examples of program output which gets parsed by
+ * this sigrok driver.
+ *
+ * $ ./omegartmcli.exe -version
+ * omegartmcli.exe Omega Real-Time Mode
+ * Version 2016-12-14
+ * Copyright (c) 1991-2016 ASIX s.r.o.
+ * Email: support@asix.net
+ *
+ * $ ./omegartmcli.exe -bin [-serial SERNO] <NULL>
+ * (five command line words including the terminator)
+ *
+ * The RTM CLI application terminates when its stdin closes, or when
+ * CTRL-C is pressed. The former is more portable across platforms. The
+ * stderr output should get ignored, it's rather noisy here under wine,
+ * communicates non-fatal diagnostics, and may communicate "progress"
+ * which we don't care about.
+ *
+ * Ideally the external process could get started earlier, and gets
+ * re-used across several sigrok acquisition activities. Unfortunately
+ * the driver's open/close actions lack a sigrok session, and cannot
+ * register the receive callback (or needs to duplicate common support
+ * code). When such an approach gets implemented, the external process'
+ * output must get drained even outside of sigrok acquisition phases,
+ * the cost of which is yet to get determined (depends on the input
+ * signals, may be expensive).
+ *
+ * The binary data format is used to reduce the amount of inter process
+ * communication. The format is rather simple: Three 16bit items (LE
+ * format) carry a timestamp (10ns resolution), and two 16bit samples
+ * (taken at 5ns intervals). The timestamp may translate to a repetition
+ * of the last sample a given number of times (RLE compression of idle
+ * phases where inputs don't change). The first timestamp after program
+ * startup is to get ignored. Chunks are sent after at most 32Ki 10ns
+ * ticks, to not overflow the 16bit counter. Which translates to a data
+ * volume of 6 bytes each 328us for idle inputs, higher for changing
+ * input signals.
+ *
+ * Is it useful to implement a set of samplerates in the sigrok driver,
+ * and downsample the data which is provided by the Asix application?
+ * This would not avoid the pressure of receiving the acquisition
+ * process' output, but may result in reduced cost on the sigrok side
+ * when users want to inspect slow signals, or export to "expensive"
+ * file formats.
+ *
+ * This driver implementation may benefit from software trigger support.
+ */
+
#include <config.h>
-#include "protocol.h"
-static struct sr_dev_driver asix_omega_rtm_cli_driver_info;
+#include <stdlib.h>
+#include <string.h>
-static GSList *scan(struct sr_dev_driver *di, GSList *options)
-{
- struct drv_context *drvc;
- GSList *devices;
+#include "protocol.h"
- (void)options;
+static const char *channel_names[] = {
+ "1", "2", "3", "4", "5", "6", "7", "8",
+ "9", "10", "11", "12", "13", "14", "15", "16",
+};
- devices = NULL;
- drvc = di->context;
- drvc->instances = NULL;
+static const uint64_t samplerates[] = {
+ SR_MHZ(200),
+};
- /* TODO: scan for devices, either based on a SR_CONF_CONN option
- * or on a USB scan. */
+static const uint32_t scanopts[] = {
+ SR_CONF_CONN, /* Accepts serial number specs. */
+};
- return devices;
-}
+static const uint32_t drvopts[] = {
+ SR_CONF_LOGIC_ANALYZER,
+};
+
+static const uint32_t devopts[] = {
+ SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
+ SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
+ SR_CONF_CONN | SR_CONF_GET,
+ SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_LIST,
+};
-static int dev_open(struct sr_dev_inst *sdi)
+static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
- (void)sdi;
+ const char *conn, *probe_names, *serno, *exe;
+ GSList *devices, *l;
+ struct sr_config *src;
+ size_t argc, chmax, chidx;
+ gchar **argv, *output, *vers_text, *eol;
+ GSpawnFlags flags;
+ GError *error;
+ gboolean ok;
+ char serno_buff[10];
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
+
+ /* Extract optional serial number from conn= spec. */
+ conn = NULL;
+ probe_names = NULL;
+ (void)sr_serial_extract_options(options, &conn, NULL);
+ if (!conn || !*conn)
+ conn = NULL;
+ for (l = options; l; l = l->next) {
+ src = l->data;
+ switch (src->key) {
+ case SR_CONF_PROBE_NAMES:
+ probe_names = g_variant_get_string(src->data, NULL);
+ break;
+ }
+ }
+ serno = NULL;
+ if (conn) {
+ if (!g_str_has_prefix(conn, "sn=")) {
+ sr_err("conn= must specify a serial number.");
+ return NULL;
+ }
+ serno = conn + strlen("sn=");
+ if (!*serno)
+ serno = NULL;
+ }
+ if (serno)
+ sr_dbg("User specified serial number: %s", serno);
+ if (serno && strlen(serno) == 4) {
+ sr_dbg("Adding 03 prefix to user specified serial number");
+ snprintf(serno_buff, sizeof(serno_buff), "03%s", serno);
+ serno = serno_buff;
+ }
+ if (serno && strlen(serno) != 6 && strlen(serno) != 8) {
+ sr_err("Serial number must be 03xxxx or A603xxxx");
+ serno = NULL;
+ }
- /* TODO: get handle from sdi->conn and open it. */
+ devices = NULL;
- return SR_OK;
-}
+ /*
+ * Check availability of the external executable. Notice that
+ * failure is non-fatal, the scan can take place even when users
+ * don't request and don't expect to use Asix Omega devices.
+ */
+ exe = getenv("OMEGARTMCLI");
+ if (!exe || !*exe)
+ exe = "omegartmcli";
+ sr_dbg("Vendor application executable: %s", exe);
+ argv = g_malloc0(5 * sizeof(argv[0]));
+ argc = 0;
+ argv[argc++] = g_strdup(exe);
+ argv[argc++] = g_strdup("-version");
+ argv[argc++] = NULL;
+ flags = G_SPAWN_SEARCH_PATH | G_SPAWN_STDERR_TO_DEV_NULL;
+ output = NULL;
+ error = NULL;
+ ok = g_spawn_sync(NULL, argv, NULL, flags, NULL, NULL,
+ &output, NULL, NULL, &error);
+ if (error && error->code != G_SPAWN_ERROR_NOENT)
+ sr_err("Cannot execute RTM CLI process: %s", error->message);
+ if (error) {
+ ok = FALSE;
+ g_error_free(error);
+ }
+ if (!output || !*output)
+ ok = FALSE;
+ if (!ok) {
+ sr_dbg("External RTM CLI execution failed.");
+ g_free(output);
+ g_strfreev(argv);
+ return NULL;
+ }
-static int dev_close(struct sr_dev_inst *sdi)
-{
- (void)sdi;
+ /*
+ * Get the executable's version from second stdout line. This
+ * only executes when the executable is found, failure to get
+ * the version information is considered fatal.
+ */
+ vers_text = strstr(output, "Version ");
+ if (!vers_text)
+ ok = FALSE;
+ if (ok) {
+ vers_text += strlen("Version ");
+ eol = strchr(vers_text, '\n');
+ if (eol)
+ *eol = '\0';
+ eol = strchr(vers_text, '\r');
+ if (eol)
+ *eol = '\0';
+ if (!vers_text || !*vers_text)
+ ok = FALSE;
+ }
+ if (!ok) {
+ sr_err("Cannot get RTM CLI executable's version.");
+ g_free(output);
+ g_strfreev(argv);
+ return NULL;
+ }
+ sr_info("RTM CLI executable version: %s", vers_text);
+
+ /*
+ * Create a device instance, add it to the result set. Create a
+ * device context. Change the -version command into the command
+ * for acquisition for later use in the driver's lifetime.
+ */
+ sdi = g_malloc0(sizeof(*sdi));
+ devices = g_slist_append(devices, sdi);
+ sdi->status = SR_ST_INITIALIZING;
+ sdi->vendor = g_strdup("ASIX");
+ sdi->model = g_strdup("OMEGA RTM CLI");
+ sdi->version = g_strdup(vers_text);
+ if (serno)
+ sdi->serial_num = g_strdup(serno);
+ if (conn)
+ sdi->connection_id = g_strdup(conn);
+ devc = g_malloc0(sizeof(*devc));
+ sdi->priv = devc;
+ devc->channel_names = sr_parse_probe_names(probe_names,
+ channel_names, ARRAY_SIZE(channel_names),
+ ARRAY_SIZE(channel_names), &chmax);
+ for (chidx = 0; chidx < chmax; chidx++) {
+ sr_channel_new(sdi, chidx, SR_CHANNEL_LOGIC,
+ TRUE, devc->channel_names[chidx]);
+ }
- /* TODO: get handle from sdi->conn and close it. */
+ sr_sw_limits_init(&devc->limits);
+ argc = 1;
+ g_free(argv[argc]);
+ argv[argc++] = g_strdup("-bin");
+ if (serno) {
+ argv[argc++] = g_strdup("-serial");
+ argv[argc++] = g_strdup(serno);
+ }
+ argv[argc++] = NULL;
+ devc->child.argv = argv;
+ devc->child.flags = flags | G_SPAWN_CLOEXEC_PIPES;
+ devc->child.fd_stdin_write = -1;
+ devc->child.fd_stdout_read = -1;
- return SR_OK;
+ return std_scan_complete(di, devices);
}
static int config_get(uint32_t key, GVariant **data,
const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
- int ret;
+ struct dev_context *devc;
- (void)sdi;
- (void)data;
(void)cg;
- ret = SR_OK;
+ if (!sdi)
+ return SR_ERR_ARG;
+ devc = sdi->priv;
+
switch (key) {
- /* TODO */
+ case SR_CONF_CONN:
+ if (!sdi->connection_id)
+ return SR_ERR_NA;
+ *data = g_variant_new_string(sdi->connection_id);
+ break;
+ case SR_CONF_SAMPLERATE:
+ *data = g_variant_new_uint64(samplerates[0]);
+ break;
+ case SR_CONF_LIMIT_MSEC:
+ case SR_CONF_LIMIT_SAMPLES:
+ return sr_sw_limits_config_get(&devc->limits, key, data);
default:
return SR_ERR_NA;
}
- return ret;
+ return SR_OK;
}
static int config_set(uint32_t key, GVariant *data,
const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
- int ret;
+ struct dev_context *devc;
- (void)sdi;
- (void)data;
(void)cg;
- ret = SR_OK;
+ if (!sdi)
+ return SR_ERR_ARG;
+ devc = sdi->priv;
+
switch (key) {
- /* TODO */
+ case SR_CONF_LIMIT_MSEC:
+ case SR_CONF_LIMIT_SAMPLES:
+ return sr_sw_limits_config_set(&devc->limits, key, data);
default:
- ret = SR_ERR_NA;
+ return SR_ERR_NA;
}
- return ret;
+ return SR_OK;
}
static int config_list(uint32_t key, GVariant **data,
const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
- int ret;
-
- (void)sdi;
- (void)data;
- (void)cg;
- ret = SR_OK;
switch (key) {
- /* TODO */
+ case SR_CONF_SCAN_OPTIONS:
+ case SR_CONF_DEVICE_OPTIONS:
+ if (cg)
+ return SR_ERR_NA;
+ return STD_CONFIG_LIST(key, data, sdi, cg,
+ scanopts, drvopts, devopts);
+ case SR_CONF_SAMPLERATE:
+ *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
+ break;
default:
return SR_ERR_NA;
}
- return ret;
+ return SR_OK;
}
static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
- /* TODO: configure hardware, reset acquisition state, set up
- * callbacks and send header packet. */
+ struct dev_context *devc;
+ int ret;
+ int fd, events;
+ uint64_t remain_count;
+
+ devc = sdi->priv;
+
+ /* Start the external acquisition process. */
+ ret = omega_rtm_cli_open(sdi);
+ if (ret != SR_OK)
+ return ret;
+ fd = devc->child.fd_stdout_read;
+ events = G_IO_IN | G_IO_ERR;
+
+ /*
+ * Start supervising acquisition limits. Arrange for a stricter
+ * "samples count" check than supported by the common approach.
+ */
+ sr_sw_limits_acquisition_start(&devc->limits);
+ ret = sr_sw_limits_get_remain(&devc->limits,
+ &remain_count, NULL, NULL, NULL);
+ if (ret != SR_OK)
+ return ret;
+ if (remain_count) {
+ devc->samples.remain_count = remain_count;
+ devc->samples.check_count = TRUE;
+ }
- (void)sdi;
+ /* Send the session feed header. */
+ ret = std_session_send_df_header(sdi);
+ if (ret != SR_OK)
+ return ret;
+
+ /* Start processing the external process' output. */
+ ret = sr_session_source_add(sdi->session, fd, events, 10,
+ omega_rtm_cli_receive_data, (void *)sdi); /* Un-const. */
+ if (ret != SR_OK)
+ return ret;
return SR_OK;
}
static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
- /* TODO: stop acquisition. */
+ struct dev_context *devc;
+ int ret;
+ int fd;
+
+ devc = sdi->priv;
+
+ /*
+ * Implementor's note: Do run all stop activities even if
+ * some of them may fail. Emit diagnostics messages as errors
+ * are seen, but don't return early.
+ */
+
+ /* Stop processing the external process' output. */
+ fd = devc->child.fd_stdout_read;
+ if (fd >= 0) {
+ ret = sr_session_source_remove(sdi->session, fd);
+ if (ret != SR_OK) {
+ sr_err("Cannot stop reading acquisition data");
+ }
+ }
+
+ ret = std_session_send_df_end(sdi);
+ (void)ret;
- (void)sdi;
+ ret = omega_rtm_cli_close(sdi);
+ if (ret != SR_OK) {
+ sr_err("Could not terminate acquisition process");
+ }
+ (void)ret;
return SR_OK;
}
.config_get = config_get,
.config_set = config_set,
.config_list = config_list,
- .dev_open = dev_open,
- .dev_close = dev_close,
+ .dev_open = std_dummy_dev_open,
+ .dev_close = std_dummy_dev_close,
.dev_acquisition_start = dev_acquisition_start,
.dev_acquisition_stop = dev_acquisition_stop,
.context = NULL,
projects / libsigrok.git / blobdiff