projects / libsigrok.git / blame
| Commit | Line | Data |
|---|---|---|
| f6582cd7 JH |
1 | /* |
| 2 | * This file is part of the sigrok project. | |
| 3 | * | |
| 4 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
| 5 | * | |
| 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. | |
| 10 | * | |
| 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. | |
| 15 | * | |
| 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/>. | |
| 18 | */ | |
| 19 | ||
| 20 | #include <libusb.h> | |
| 21 | ||
| 22 | #include "command.h" | |
| 23 | #include "sigrok.h" | |
| 24 | #include "sigrok-internal.h" | |
| 25 | ||
| dba02442 JH |
26 | int command_start_acquisition(libusb_device_handle *devhdl, |
| 27 | uint64_t samplerate) | |
| f6582cd7 | 28 | { |
| dba02442 JH |
29 | struct cmd_start_acquisition cmd; |
| 30 | int delay = 0; | |
| 31 | ||
| 32 | /* Compute the sample rate */ | |
| 33 | if((SR_MHZ(48) % samplerate) == 0) | |
| 34 | { | |
| 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; | |
| 40 | } | |
| 41 | ||
| 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", | |
| 45 | samplerate); | |
| 46 | return SR_ERR; | |
| 47 | } | |
| 48 | ||
| 49 | cmd.sample_delay = delay; | |
| 50 | ||
| 51 | /* Send the control message */ | |
| f6582cd7 JH |
52 | const int res = libusb_control_transfer(devhdl, |
| 53 | LIBUSB_REQUEST_TYPE_VENDOR | | |
| 54 | LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, | |
| dba02442 JH |
55 | 0x0000, (unsigned char*)&cmd, |
| 56 | sizeof(cmd), 100); | |
| f6582cd7 JH |
57 | if (res < 0) { |
| 58 | sr_err("fx2lafw: Unable to send start command: %d", | |
| 59 | res); | |
| 60 | return SR_ERR; | |
| 61 | } | |
| 62 | ||
| 63 | return SR_OK; | |
| 64 | } |