+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2013 Bert Vermeulen <bert@biot.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 "protocol.h"
-
-#include <string.h>
-#include <math.h>
-
-extern struct sr_dev_driver uni_t_ut32x_driver_info;
-static struct sr_dev_driver *di = &uni_t_ut32x_driver_info;
-
-static float parse_temperature(unsigned char *buf)
-{
- float temp;
- int i;
- gboolean negative;
-
- negative = FALSE;
- temp = 0.0;
- for (i = 0; i < 4; i++) {
- if (buf[i] == 0x3a)
- continue;
- if (buf[i] == 0x3b) {
- if (negative) {
- sr_dbg("Double negative sign!");
- return NAN;
- } else {
- negative = TRUE;
- continue;
- }
- }
- if (buf[i] < 0x30 || buf[i] > 0x39) {
- sr_dbg("Invalid digit '%.2x'!", buf[i]);
- return NAN;
- }
- temp *= 10;
- temp += (buf[i] - 0x30);
- }
- temp /= 10;
- if (negative)
- temp = -temp;
-
- return temp;
-}
-
-static void process_packet(struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct sr_datafeed_packet packet;
- struct sr_datafeed_analog analog;
- GString *spew;
- float temp;
- int i;
- gboolean is_valid;
-
- devc = sdi->priv;
- sr_dbg("Received full 19-byte packet.");
- if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
- spew = g_string_sized_new(60);
- for (i = 0; i < devc->packet_len; i++)
- g_string_append_printf(spew, "%.2x ", devc->packet[i]);
- sr_spew("%s", spew->str);
- g_string_free(spew, TRUE);
- }
-
- is_valid = TRUE;
- if (devc->packet[1] == 0x3b && devc->packet[2] == 0x3b
- && devc->packet[3] == 0x3b && devc->packet[4] == 0x3b)
- /* No measurement: missing channel, empty storage location, ... */
- is_valid = FALSE;
-
- temp = parse_temperature(devc->packet + 1);
- if (isnan(temp))
- is_valid = FALSE;
-
- if (is_valid) {
- memset(&analog, 0, sizeof(struct sr_datafeed_analog));
- analog.mq = SR_MQ_TEMPERATURE;
- analog.mqflags = 0;
- switch (devc->packet[5] - 0x30) {
- case 1:
- analog.unit = SR_UNIT_CELSIUS;
- break;
- case 2:
- analog.unit = SR_UNIT_FAHRENHEIT;
- break;
- case 3:
- analog.unit = SR_UNIT_KELVIN;
- break;
- default:
- /* We can still pass on the measurement, whatever it is. */
- sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
- }
- switch (devc->packet[13] - 0x30) {
- case 0:
- /* Channel T1. */
- analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
- break;
- case 1:
- /* Channel T2. */
- analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
- break;
- case 2:
- case 3:
- /* Channel T1-T2. */
- analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
- analog.mqflags |= SR_MQFLAG_RELATIVE;
- break;
- default:
- sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
- is_valid = FALSE;
- }
- if (is_valid) {
- analog.num_samples = 1;
- analog.data = &temp;
- packet.type = SR_DF_ANALOG;
- packet.payload = &analog;
- sr_session_send(devc->cb_data, &packet);
- g_slist_free(analog.channels);
- }
- }
-
- /* We count packets even if the temperature was invalid. This way
- * a sample limit on "Memory" data source still works: unused
- * memory slots come through as "----" measurements. */
- devc->num_samples++;
- if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
- sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
- devc->cb_data);
- }
-
-}
-
-SR_PRIV void uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
-{
- struct dev_context *devc;
- struct sr_dev_inst *sdi;
- int hid_payload_len, ret;
-
- sdi = transfer->user_data;
- devc = sdi->priv;
- if (transfer->actual_length == 8) {
- /* CH9325 encodes length in low nibble of first byte, with
- * bytes 1-7 being the (padded) payload. */
- hid_payload_len = transfer->buffer[0] & 0x0f;
- memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
- hid_payload_len);
- devc->packet_len += hid_payload_len;
- if (devc->packet_len >= 2
- && devc->packet[devc->packet_len - 2] == 0x0d
- && devc->packet[devc->packet_len - 1] == 0x0a) {
- /* Got end of packet, but do we have a complete packet? */
- if (devc->packet_len == 19)
- process_packet(sdi);
- /* Either way, done with it. */
- devc->packet_len = 0;
- } else if (devc->packet_len > 19) {
- /* Guard against garbage from the device overrunning
- * our packet buffer. */
- sr_dbg("Buffer overrun!");
- devc->packet_len = 0;
- }
- }
-
- /* Get the next transfer (unless we're shutting down). */
- if (sdi->status != SR_ST_STOPPING) {
- if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
- sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
- sdi->status = SR_ST_STOPPING;
- libusb_free_transfer(devc->xfer);
- }
- } else
- libusb_free_transfer(devc->xfer);
-
-}
-
-SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
-{
- struct drv_context *drvc;
- struct dev_context *devc;
- struct sr_dev_inst *sdi;
- struct sr_datafeed_packet packet;
- struct sr_usb_dev_inst *usb;
- struct timeval tv;
- int len, ret;
- unsigned char cmd[2];
-
- (void)fd;
- (void)revents;
-
- drvc = di->priv;
-
- if (!(sdi = cb_data))
- return TRUE;
-
- if (!(devc = sdi->priv))
- return TRUE;
-
- memset(&tv, 0, sizeof(struct timeval));
- libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
- NULL);
-
- if (sdi->status == SR_ST_STOPPING) {
- usb_source_remove(sdi->session, drvc->sr_ctx);
- packet.type = SR_DF_END;
- sr_session_send(cb_data, &packet);
-
- /* Tell the device to stop sending USB packets. */
- usb = sdi->conn;
- cmd[0] = 0x01;
- cmd[1] = CMD_STOP;
- ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
- if (ret != 0 || len != 2) {
- /* Warning only, doesn't matter. */
- sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
- }
-
- sdi->status = SR_ST_ACTIVE;
- return TRUE;
- }
-
- return TRUE;
-}
-
projects / libsigrok.git / blobdiff