--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
+ * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@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 <glib.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+#include "protocol.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+static const int hwopts[] = {
+ SR_HWOPT_CONN,
+ SR_HWOPT_SERIALCOMM,
+ 0,
+};
+
+static const int hwcaps[] = {
+ SR_HWCAP_MULTIMETER,
+ SR_HWCAP_LIMIT_SAMPLES,
+ SR_HWCAP_CONTINUOUS,
+ 0,
+};
+
+static const char *probe_names[] = {
+ "Probe",
+ NULL,
+};
+
+SR_PRIV struct sr_dev_driver tekpower_driver_info;
+static struct sr_dev_driver *di = &tekpower_driver_info;
+
+/* Properly close and free all devices. */
+static int clear_instances(void)
+{
+ struct sr_dev_inst *sdi;
+ struct drv_context *drvc;
+ struct dev_context *devc;
+ GSList *l;
+
+ if (!(drvc = di->priv))
+ return SR_OK;
+
+ drvc = di->priv;
+ for (l = drvc->instances; l; l = l->next) {
+ if (!(sdi = l->data))
+ continue;
+ if (!(devc = sdi->priv))
+ continue;
+ sr_serial_dev_inst_free(devc->serial);
+ sr_dev_inst_free(sdi);
+ }
+ g_slist_free(drvc->instances);
+ drvc->instances = NULL;
+
+ return SR_OK;
+}
+
+static int hw_init(void)
+{
+ struct drv_context *drvc;
+
+ if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
+ sr_err("driver context malloc failed.");
+ return SR_ERR;
+ }
+
+ di->priv = drvc;
+
+ return SR_OK;
+}
+
+static int serial_readline(int fd, char **buf, size_t *buflen,
+ uint64_t timeout_ms)
+{
+ uint64_t start;
+ int maxlen, len;
+
+ timeout_ms *= 1000;
+ start = g_get_monotonic_time();
+
+ maxlen = *buflen;
+ *buflen = len = 0;
+ while(1) {
+ len = maxlen - *buflen - 1;
+ if (len < 1)
+ break;
+ len = serial_read(fd, *buf + *buflen, 1);
+ if (len > 0) {
+ *buflen += len;
+ *(*buf + *buflen) = '\0';
+ if (*buflen > 0 && *(*buf + *buflen - 1) == '\r') {
+ /* Strip LF and terminate. */
+ *(*buf + --*buflen) = '\0';
+ break;
+ }
+ }
+ if (g_get_monotonic_time() - start > timeout_ms)
+ /* Timeout */
+ break;
+ g_usleep(2000);
+ }
+
+ return SR_OK;
+}
+
+static GSList *lcd14_scan(const char *conn, const char *serialcomm)
+{
+ struct sr_dev_inst *sdi;
+ struct drv_context *drvc;
+ struct dev_context *devc;
+ struct sr_probe *probe;
+ GSList *devices;
+ int fd, retry;
+ size_t len;
+ char buf[128], *b;
+
+ if ((fd = serial_open(conn, O_RDONLY|O_NONBLOCK)) == -1) {
+ sr_err("unable to open %s: %s",
+ conn, strerror(errno));
+ return NULL;
+ }
+ if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
+ sr_err("unable to set serial parameters");
+ return NULL;
+ }
+
+ sr_info("probing port %s readonly", conn);
+
+ drvc = di->priv;
+ b = buf;
+ retry = 0;
+ devices = NULL;
+ serial_flush(fd);
+ /* There's no way to get an ID from the multimeter. It just sends data
+ * periodically, so the best we can do is check if the packets match the
+ * expected format. */
+ while (!devices && retry < 3)
+ {
+ size_t i;
+ size_t good_packets = 0;
+ retry++;
+
+ /* Let's get a bit of data and see if we can find a packet */
+ len = sizeof(buf);
+ serial_readline(fd, &b, &len, 500);
+ if( (len == 0) || (len < LCD14_PACKET_SIZE) ) {
+ /* Not enough data received, is the DMM connected ? */
+ continue;
+ }
+
+ /* Let's treat our buffer like a stream, and find any
+ * valid packets */
+ for( i = 0; i < len - LCD14_PACKET_SIZE + 1;
+ /* don't increment i here */ )
+ {
+ const lcd14_packet *packet = (void *)(&buf[i]);
+ if( !lcd14_is_packet_valid(packet, NULL) ){
+ i++;
+ continue;
+ }
+ good_packets++;
+ i += LCD14_PACKET_SIZE;
+ }
+
+ /* If we dropped more than two packets worth of data, something
+ * is wrong */
+ size_t dropped = len - (good_packets * LCD14_PACKET_SIZE);
+ if(dropped > 2 * LCD14_PACKET_SIZE)
+ continue;
+
+ /* Let's see if we have anything good */
+ if (good_packets == 0)
+ continue;
+
+ sr_info("found device on port %s", conn);
+
+ if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
+ "TP4000ZC", "")))
+ return NULL;
+ if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
+ sr_dbg("failed to malloc devc");
+ return NULL;
+ }
+
+ /* devc->profile = RADIOSHACK_22_812; */
+ devc->serial = sr_serial_dev_inst_new(conn, -1);
+ devc->serialcomm = g_strdup(serialcomm);
+
+ sdi->priv = devc;
+ sdi->driver = di;
+ if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
+ return NULL;
+ sdi->probes = g_slist_append(sdi->probes, probe);
+ drvc->instances = g_slist_append(drvc->instances, sdi);
+ devices = g_slist_append(devices, sdi);
+ break;
+ }
+
+ serial_close(fd);
+ return devices;
+}
+
+static GSList *hw_scan(GSList *options)
+{
+ struct sr_hwopt *opt;
+ GSList *l, *devices;
+ const char *conn, *serialcomm;
+
+ conn = serialcomm = NULL;
+ for (l = options; l; l = l->next) {
+ opt = l->data;
+ switch (opt->hwopt) {
+ case SR_HWOPT_CONN:
+ conn = opt->value;
+ break;
+ case SR_HWOPT_SERIALCOMM:
+ serialcomm = opt->value;
+ break;
+ }
+ }
+ if (!conn)
+ return NULL;
+
+ if (serialcomm) {
+ /* Use the provided comm specs. */
+ devices = lcd14_scan(conn, serialcomm);
+ } else {
+ /* Then try the default 2400 8n1 */
+ devices = lcd14_scan(conn, "2400/8n1");
+ }
+
+ return devices;
+}
+
+static GSList *hw_dev_list(void)
+{
+ struct drv_context *drvc;
+
+ drvc = di->priv;
+
+ return drvc->instances;
+}
+
+static int hw_dev_open(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+
+ if (!(devc = sdi->priv)) {
+ sr_err("sdi->priv was NULL.");
+ return SR_ERR_BUG;
+ }
+
+ devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
+ if (devc->serial->fd == -1) {
+ sr_err("Couldn't open serial port '%s'.",
+ devc->serial->port);
+ return SR_ERR;
+ }
+ if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
+ sr_err("unable to set serial parameters");
+ return SR_ERR;
+ }
+ sdi->status = SR_ST_ACTIVE;
+
+ return SR_OK;
+}
+
+static int hw_dev_close(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+
+ if (!(devc = sdi->priv)) {
+ sr_err("sdi->priv was NULL.");
+ return SR_ERR_BUG;
+ }
+
+ if (devc->serial && devc->serial->fd != -1) {
+ serial_close(devc->serial->fd);
+ devc->serial->fd = -1;
+ sdi->status = SR_ST_INACTIVE;
+ }
+
+ return SR_OK;
+}
+
+static int hw_cleanup(void)
+{
+ clear_instances();
+
+ return SR_OK;
+}
+
+static int hw_info_get(int info_id, const void **data,
+ const struct sr_dev_inst *sdi)
+{
+ (void)sdi; /* Does nothing. prevents "unused parameter" warning */
+
+ switch (info_id) {
+ case SR_DI_HWOPTS:
+ *data = hwopts;
+ break;
+ case SR_DI_HWCAPS:
+ *data = hwcaps;
+ break;
+ case SR_DI_NUM_PROBES:
+ *data = GINT_TO_POINTER(1);
+ break;
+ case SR_DI_PROBE_NAMES:
+ *data = probe_names;
+ break;
+ default:
+ return SR_ERR_ARG;
+ }
+
+ return SR_OK;
+}
+
+static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
+ const void *value)
+{
+ struct dev_context *devc;
+
+ if (sdi->status != SR_ST_ACTIVE)
+ return SR_ERR;
+
+ if (!(devc = sdi->priv)) {
+ sr_err("sdi->priv was NULL.");
+ return SR_ERR_BUG;
+ }
+
+ switch (hwcap) {
+ case SR_HWCAP_LIMIT_SAMPLES:
+ devc->limit_samples = *(const uint64_t *)value;
+ sr_dbg("Setting sample limit to %" PRIu64 ".",
+ devc->limit_samples);
+ break;
+ default:
+ sr_err("Unknown capability: %d.", hwcap);
+ return SR_ERR;
+ break;
+ }
+
+ return SR_OK;
+}
+
+static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
+ void *cb_data)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_header header;
+ struct sr_datafeed_meta_analog meta;
+ struct dev_context *devc;
+
+ if (!(devc = sdi->priv)) {
+ sr_err("sdi->priv was NULL.");
+ return SR_ERR_BUG;
+ }
+
+ sr_dbg("Starting acquisition.");
+
+ devc->cb_data = cb_data;
+
+ /* Reset the number of samples to take. If we've already collected our
+ * quota, but we start a new session, and don't reset this, we'll just
+ * quit without aquiring any new samples */
+ devc->num_samples = 0;
+
+ /* Send header packet to the session bus. */
+ sr_dbg("Sending SR_DF_HEADER.");
+ packet.type = SR_DF_HEADER;
+ packet.payload = (uint8_t *)&header;
+ header.feed_version = 1;
+ gettimeofday(&header.starttime, NULL);
+ sr_session_send(devc->cb_data, &packet);
+
+ /* Send metadata about the SR_DF_ANALOG packets to come. */
+ sr_dbg("Sending SR_DF_META_ANALOG.");
+ packet.type = SR_DF_META_ANALOG;
+ packet.payload = &meta;
+ meta.num_probes = 1;
+ sr_session_send(devc->cb_data, &packet);
+
+ /* Poll every 100ms, or whenever some data comes in. */
+ sr_source_add(devc->serial->fd, G_IO_IN, 50,
+ lcd14_receive_data, (void *)sdi );
+
+ return SR_OK;
+}
+
+static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
+ void *cb_data)
+{
+ struct sr_datafeed_packet packet;
+ struct dev_context *devc;
+
+ if (sdi->status != SR_ST_ACTIVE)
+ return SR_ERR;
+
+ if (!(devc = sdi->priv)) {
+ sr_err("sdi->priv was NULL.");
+ return SR_ERR_BUG;
+ }
+
+ sr_dbg("Stopping acquisition.");
+
+ sr_source_remove(devc->serial->fd);
+ hw_dev_close((struct sr_dev_inst *)sdi);
+
+ /* Send end packet to the session bus. */
+ sr_dbg("Sending SR_DF_END.");
+ packet.type = SR_DF_END;
+ sr_session_send(cb_data, &packet);
+
+ return SR_OK;
+}
+
+SR_PRIV struct sr_dev_driver tekpower_driver_info = {
+ .name = "tekpower-dmm",
+ .longname = "TekPower/Digitek 4000ZC",
+ .api_version = 1,
+ .init = hw_init,
+ .cleanup = hw_cleanup,
+ .scan = hw_scan,
+ .dev_list = hw_dev_list,
+ .dev_clear = clear_instances,
+ .dev_open = hw_dev_open,
+ .dev_close = hw_dev_close,
+ .info_get = hw_info_get,
+ .dev_config_set = hw_dev_config_set,
+ .dev_acquisition_start = hw_dev_acquisition_start,
+ .dev_acquisition_stop = hw_dev_acquisition_stop,
+ .priv = NULL,
+};
projects / libsigrok.git / blobdiff