461 lines
10 KiB
C
461 lines
10 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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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 <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include "config.h"
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#include "radioshack-dmm.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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static const int hwopts[] = {
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SR_HWOPT_CONN,
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SR_HWOPT_SERIALCOMM,
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0,
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};
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static const int hwcaps[] = {
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SR_HWCAP_MULTIMETER,
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SR_HWCAP_LIMIT_SAMPLES,
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SR_HWCAP_CONTINUOUS,
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0,
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};
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static const char *probe_names[] = {
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"Probe",
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NULL,
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};
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SR_PRIV struct sr_dev_driver radioshackdmm_driver_info;
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static struct sr_dev_driver *di = &radioshackdmm_driver_info;
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static const struct radioshackdmm_profile supported_radioshackdmm[] = {
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{ RADIOSHACK_22_812, "22-812", 100 },
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};
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/* Properly close and free all devices. */
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static int clear_instances(void)
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{
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struct sr_dev_inst *sdi;
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struct drv_context *drvc;
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struct dev_context *devc;
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GSList *l;
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if (!(drvc = di->priv))
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return SR_OK;
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drvc = di->priv;
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for (l = drvc->instances; l; l = l->next) {
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if (!(sdi = l->data))
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continue;
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if (!(devc = sdi->priv))
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continue;
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sr_serial_dev_inst_free(devc->serial);
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sr_dev_inst_free(sdi);
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}
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g_slist_free(drvc->instances);
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drvc->instances = NULL;
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return SR_OK;
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}
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static int hw_init(void)
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{
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struct drv_context *drvc;
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if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
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sr_err("radioshack-dmm: driver context malloc failed.");
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return SR_ERR;
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}
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di->priv = drvc;
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return SR_OK;
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}
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static int serial_readline(int fd, char **buf, size_t *buflen,
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uint64_t timeout_ms)
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{
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uint64_t start;
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int maxlen, len;
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timeout_ms *= 1000;
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start = g_get_monotonic_time();
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maxlen = *buflen;
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*buflen = len = 0;
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while(1) {
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len = maxlen - *buflen - 1;
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if (len < 1)
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break;
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len = serial_read(fd, *buf + *buflen, 1);
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if (len > 0) {
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*buflen += len;
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*(*buf + *buflen) = '\0';
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if (*buflen > 0 && *(*buf + *buflen - 1) == '\r') {
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/* Strip LF and terminate. */
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*(*buf + --*buflen) = '\0';
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break;
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}
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}
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if (g_get_monotonic_time() - start > timeout_ms)
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/* Timeout */
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break;
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g_usleep(2000);
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}
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return SR_OK;
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}
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static GSList *rs_22_812_scan(const char *conn, const char *serialcomm)
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{
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struct sr_dev_inst *sdi;
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struct drv_context *drvc;
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struct dev_context *devc;
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struct sr_probe *probe;
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GSList *devices;
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int fd, retry;
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size_t len;
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char buf[128], *b;
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if ((fd = serial_open(conn, O_RDONLY|O_NONBLOCK)) == -1) {
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sr_err("radioshack-dmm: unable to open %s: %s",
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conn, strerror(errno));
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return NULL;
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}
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if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
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sr_err("radioshack-dmm: unable to set serial parameters");
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return NULL;
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}
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sr_info("radioshack-dmm: probing port %s readonly", conn);
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drvc = di->priv;
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b = buf;
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retry = 0;
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devices = NULL;
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/* There's no way to get an ID from the multimeter. It just sends data
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* periodically, so the best we can do is check if the packets match the
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* expected format. */
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while (!devices && retry < 3)
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{
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size_t i;
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size_t good_packets = 0;
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retry++;
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serial_flush(fd);
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/* Let's get a bit of data and see if we can find a packet */
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len = sizeof(buf);
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serial_readline(fd, &b, &len, 250);
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if( (len == 0) || (len < RS_22_812_PACKET_SIZE) ) {
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/* Not enough data received, is the DMM connected ? */
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continue;
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}
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/* Let's treat our buffer like a stream, and find any
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* valid packets */
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for( i = 0; i < len - RS_22_812_PACKET_SIZE + 1;
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/* don't increment i here */ )
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{
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const rs_22_812_packet *packet = (void *)(&buf[i]);
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if( !rs_22_812_is_packet_valid(packet) ){
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i++;
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continue;
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}
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good_packets++;
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i += RS_22_812_PACKET_SIZE;
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}
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/* If we dropped more than two packets worth of data, something
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* is wrong */
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size_t dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
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if(dropped > 2 * RS_22_812_PACKET_SIZE)
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continue;
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/* Let's see if we have anything good */
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if (good_packets == 0)
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continue;
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sr_info("radioshack-dmm: found RS 22-812 on port %s", conn);
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if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Radioshack",
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"22-812", "")))
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return NULL;
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if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
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sr_dbg("radioshack-dmm: failed to malloc devc");
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return NULL;
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}
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/* devc->profile = RADIOSHACK_22_812; */
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devc->serial = sr_serial_dev_inst_new(conn, -1);
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devc->serialcomm = g_strdup(serialcomm);
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sdi->priv = devc;
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sdi->driver = di;
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if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
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return NULL;
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sdi->probes = g_slist_append(sdi->probes, probe);
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drvc->instances = g_slist_append(drvc->instances, sdi);
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devices = g_slist_append(devices, sdi);
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break;
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}
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serial_close(fd);
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return devices;
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}
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static GSList *hw_scan(GSList *options)
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{
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struct sr_hwopt *opt;
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GSList *l, *devices;
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const char *conn, *serialcomm;
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conn = serialcomm = NULL;
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for (l = options; l; l = l->next) {
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opt = l->data;
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switch (opt->hwopt) {
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case SR_HWOPT_CONN:
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conn = opt->value;
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break;
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case SR_HWOPT_SERIALCOMM:
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serialcomm = opt->value;
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break;
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}
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}
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if (!conn)
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return NULL;
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if (serialcomm) {
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/* Use the provided comm specs. */
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devices = rs_22_812_scan(conn, serialcomm);
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} else {
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/* Then try the default 4800 8n1 */
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devices = rs_22_812_scan(conn, "4800/8n1");
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}
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return devices;
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}
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static GSList *hw_dev_list(void)
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{
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struct drv_context *drvc;
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drvc = di->priv;
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return drvc->instances;
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}
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static int hw_dev_open(struct sr_dev_inst *sdi)
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{
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struct dev_context *devc;
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if (!(devc = sdi->priv)) {
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sr_err("radioshack-dmm: sdi->priv was NULL.");
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return SR_ERR_BUG;
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}
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devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
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if (devc->serial->fd == -1) {
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sr_err("radioshack-dmm: Couldn't open serial port '%s'.",
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devc->serial->port);
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return SR_ERR;
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}
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if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
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sr_err("radioshack-dmm: unable to set serial parameters");
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return SR_ERR;
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}
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sdi->status = SR_ST_ACTIVE;
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return SR_OK;
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}
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static int hw_dev_close(struct sr_dev_inst *sdi)
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{
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struct dev_context *devc;
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if (!(devc = sdi->priv)) {
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sr_err("radioshack-dmm: sdi->priv was NULL.");
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return SR_ERR_BUG;
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}
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if (devc->serial && devc->serial->fd != -1) {
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serial_close(devc->serial->fd);
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devc->serial->fd = -1;
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sdi->status = SR_ST_INACTIVE;
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}
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return SR_OK;
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}
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static int hw_cleanup(void)
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{
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clear_instances();
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return SR_OK;
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}
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static int hw_info_get(int info_id, const void **data,
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const struct sr_dev_inst *sdi)
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{
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(void)sdi; /* Does nothing. prevents "unused parameter" warning */
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switch (info_id) {
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case SR_DI_HWOPTS:
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*data = hwopts;
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break;
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case SR_DI_HWCAPS:
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*data = hwcaps;
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break;
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case SR_DI_NUM_PROBES:
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*data = GINT_TO_POINTER(1);
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break;
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case SR_DI_PROBE_NAMES:
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*data = probe_names;
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break;
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default:
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return SR_ERR_ARG;
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}
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return SR_OK;
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}
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static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
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const void *value)
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{
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struct dev_context *devc;
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if (sdi->status != SR_ST_ACTIVE)
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return SR_ERR;
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if (!(devc = sdi->priv)) {
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sr_err("radioshack-dmm: sdi->priv was NULL.");
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return SR_ERR_BUG;
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}
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switch (hwcap) {
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case SR_HWCAP_LIMIT_SAMPLES:
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devc->limit_samples = *(const uint64_t *)value;
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sr_dbg("radioshack-dmm: Setting sample limit to %" PRIu64 ".",
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devc->limit_samples);
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break;
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default:
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sr_err("radioshack-dmm: Unknown capability: %d.", hwcap);
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return SR_ERR;
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break;
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}
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return SR_OK;
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}
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static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
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void *cb_data)
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{
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struct sr_datafeed_packet packet;
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struct sr_datafeed_header header;
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struct sr_datafeed_meta_analog meta;
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struct dev_context *devc;
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if (!(devc = sdi->priv)) {
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sr_err("radioshack-dmm: sdi->priv was NULL.");
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return SR_ERR_BUG;
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}
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sr_dbg("radioshack-dmm: Starting acquisition.");
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devc->cb_data = cb_data;
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/* Reset the number of samples to take. If we've already collected our
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* quota, but we start a new session, and don't reset this, we'll just
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* quit without aquiring any new samples */
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devc->num_samples = 0;
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/* Send header packet to the session bus. */
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sr_dbg("radioshack-dmm: Sending SR_DF_HEADER.");
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packet.type = SR_DF_HEADER;
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packet.payload = (uint8_t *)&header;
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header.feed_version = 1;
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gettimeofday(&header.starttime, NULL);
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sr_session_send(devc->cb_data, &packet);
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/* Send metadata about the SR_DF_ANALOG packets to come. */
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sr_dbg("radioshack-dmm: Sending SR_DF_META_ANALOG.");
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packet.type = SR_DF_META_ANALOG;
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packet.payload = &meta;
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meta.num_probes = 1;
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sr_session_send(devc->cb_data, &packet);
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/* Poll every 100ms, or whenever some data comes in. */
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sr_source_add(devc->serial->fd, G_IO_IN, 50,
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radioshack_receive_data, (void *)sdi );
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return SR_OK;
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}
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static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
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void *cb_data)
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{
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struct sr_datafeed_packet packet;
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struct dev_context *devc;
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if (sdi->status != SR_ST_ACTIVE)
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return SR_ERR;
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if (!(devc = sdi->priv)) {
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sr_err("radioshack-dmm: sdi->priv was NULL.");
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return SR_ERR_BUG;
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}
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sr_dbg("radioshack-dmm: Stopping acquisition.");
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sr_source_remove(devc->serial->fd);
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hw_dev_close((struct sr_dev_inst *)sdi);
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/* Send end packet to the session bus. */
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sr_dbg("radioshack-dmm: Sending SR_DF_END.");
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packet.type = SR_DF_END;
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sr_session_send(cb_data, &packet);
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return SR_OK;
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}
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SR_PRIV struct sr_dev_driver radioshackdmm_driver_info = {
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.name = "radioshack-dmm",
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.longname = "Radioshack 22-812/22-039 DMMs",
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.api_version = 1,
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.init = hw_init,
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.cleanup = hw_cleanup,
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.scan = hw_scan,
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.dev_list = hw_dev_list,
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.dev_clear = clear_instances,
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.dev_open = hw_dev_open,
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.dev_close = hw_dev_close,
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.info_get = hw_info_get,
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.dev_config_set = hw_dev_config_set,
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.dev_acquisition_start = hw_dev_acquisition_start,
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.dev_acquisition_stop = hw_dev_acquisition_stop,
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.priv = NULL,
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};
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