libsigrok
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros
command.c
Go to the documentation of this file.
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 "fx2lafw.h"
23 #include "command.h"
24 #include "sigrok.h"
25 #include "sigrok-internal.h"
26 
27 SR_PRIV int command_get_fw_version(libusb_device_handle *devhdl,
28  struct version_info *vi)
29 {
30  int ret;
31 
32  ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
33  LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
34  (unsigned char *)vi, sizeof(struct version_info), 100);
35 
36  if (ret < 0) {
37  sr_err("fx2lafw: Unable to get version info: %d.", ret);
38  return SR_ERR;
39  }
40 
41  return SR_OK;
42 }
43 
44 SR_PRIV int command_get_revid_version(libusb_device_handle *devhdl,
45  uint8_t *revid)
46 {
47  int ret;
48 
49  ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
50  LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000,
51  revid, 1, 100);
52 
53  if (ret < 0) {
54  sr_err("fx2lafw: Unable to get REVID: %d.", ret);
55  return SR_ERR;
56  }
57 
58  return SR_OK;
59 }
60 
61 SR_PRIV int command_start_acquisition(libusb_device_handle *devhdl,
62  uint64_t samplerate)
63 {
64  struct cmd_start_acquisition cmd;
65  int delay = 0, ret;
66 
67  /* Compute the sample rate. */
68  if ((SR_MHZ(48) % samplerate) == 0) {
70  delay = SR_MHZ(48) / samplerate - 1;
71  if (delay > MAX_SAMPLE_DELAY)
72  delay = 0;
73  }
74 
75  if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
77  delay = SR_MHZ(30) / samplerate - 1;
78  }
79 
80  sr_info("fx2lafw: GPIF delay = %d, clocksource = %sMHz", delay,
81  (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
82 
83  if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
84  sr_err("fx2lafw: Unable to sample at %" PRIu64 "Hz.",
85  samplerate);
86  return SR_ERR;
87  }
88 
89  cmd.sample_delay_h = (delay >> 8) & 0xff;
90  cmd.sample_delay_l = delay & 0xff;
91 
92  /* Send the control message. */
93  ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
94  LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
95  (unsigned char *)&cmd, sizeof(cmd), 100);
96  if (ret < 0) {
97  sr_err("fx2lafw: Unable to send start command: %d.", ret);
98  return SR_ERR;
99  }
100 
101  return SR_OK;
102 }