2 * This file is part of the sigrok project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "sigrok-internal.h"
26 int command_start_acquisition(libusb_device_handle *devhdl,
29 struct cmd_start_acquisition cmd;
32 /* Compute the sample rate */
33 if((SR_MHZ(48) % samplerate) == 0)
35 cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
36 delay = SR_MHZ(48) / samplerate - 1;
37 } else if((SR_MHZ(30) % samplerate) == 0) {
38 cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
39 delay = SR_MHZ(30) / samplerate - 1;
42 /* Note that sample_delay=0 is treated as sample_delay=256 */
43 if (delay <= 0 || delay > 256) {
44 sr_err("fx2lafw: Unable to sample at %dHz",
49 cmd.sample_delay = delay;
51 /* Send the control message */
52 const int res = libusb_control_transfer(devhdl,
53 LIBUSB_REQUEST_TYPE_VENDOR |
54 LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000,
55 0x0000, (unsigned char*)&cmd,
58 sr_err("fx2lafw: Unable to send start command: %d",