libsigrok/hardware/fx2lafw/command.c

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/*
* This file is part of the sigrok project.
*
* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
*
* 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 <libusb.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "fx2lafw.h"
#include "command.h"
SR_PRIV int command_get_fw_version(libusb_device_handle *devhdl,
struct version_info *vi)
{
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int ret;
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ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
(unsigned char *)vi, sizeof(struct version_info), 100);
if (ret < 0) {
sr_err("Unable to get version info: %s.",
libusb_error_name(ret));
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return SR_ERR;
}
return SR_OK;
}
SR_PRIV int command_get_revid_version(libusb_device_handle *devhdl,
uint8_t *revid)
{
int ret;
ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000,
revid, 1, 100);
if (ret < 0) {
sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
return SR_ERR;
}
return SR_OK;
}
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SR_PRIV int command_start_acquisition(libusb_device_handle *devhdl,
uint64_t samplerate, gboolean samplewide)
{
struct cmd_start_acquisition cmd;
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int delay = 0, ret;
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/* Compute the sample rate. */
if (samplewide && samplerate > MAX_16BIT_SAMPLE_RATE) {
sr_err("Unable to sample at %" PRIu64 "Hz "
"when collecting 16-bit samples.", samplerate);
return SR_ERR;
}
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if ((SR_MHZ(48) % samplerate) == 0) {
cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
delay = SR_MHZ(48) / samplerate - 1;
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if (delay > MAX_SAMPLE_DELAY)
delay = 0;
}
if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
delay = SR_MHZ(30) / samplerate - 1;
}
sr_info("GPIF delay = %d, clocksource = %sMHz.", delay,
(cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
return SR_ERR;
}
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cmd.sample_delay_h = (delay >> 8) & 0xff;
cmd.sample_delay_l = delay & 0xff;
/* Select the sampling width. */
cmd.flags |= samplewide ? CMD_START_FLAGS_SAMPLE_16BIT :
CMD_START_FLAGS_SAMPLE_8BIT;
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/* Send the control message. */
ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
(unsigned char *)&cmd, sizeof(cmd), 100);
if (ret < 0) {
sr_err("Unable to send start command: %s.",
libusb_error_name(ret));
return SR_ERR;
}
return SR_OK;
}