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sdrangel/plugins/samplesource/v4l-msi/v4lsource.cpp
hexameron 00ed2c2004 Gain settings.
2015-05-21 18:09:12 +00:00

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/*
* Copyright 2013 Antti Palosaari <crope@iki.fi>
*
* This 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, or (at your option)
* any later version.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "v4linput.h"
#include "v4lthread.h"
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <uapi/linux/videodev2.h>
#include "libv4l2.h"
#include <fcntl.h>
#include <sys/mman.h>
#define CID_CLASS_RF (0x00a20000)
#define CID_RF_TUNER_CLASS_BASE (0x00a20900)
#define CID_TUNER_BW_AUTO (CID_RF_TUNER_CLASS_BASE + 11)
#define CID_TUNER_BW (CID_RF_TUNER_CLASS_BASE + 12)
#define CID_TUNER_LNA_GAIN (CID_RF_TUNER_CLASS_BASE + 42)
#define CID_TUNER_MIXER_GAIN (CID_RF_TUNER_CLASS_BASE + 52)
#define CID_TUNER_IF_GAIN (CID_RF_TUNER_CLASS_BASE + 62)
#define V4L2_PIX_FMT_SDR_U8 v4l2_fourcc('C', 'U', '0', '8') /* unsigned 8-bit Complex*/
#define V4L2_PIX_FMT_SDR_U16LE v4l2_fourcc('C', 'U', '1', '6') /* unsigned 16-bit Complex*/
#define V4L2_PIX_FMT_SDR_CS14LE v4l2_fourcc('C', 'S', '1', '4') /* signed 14-bit Complex*/
#define CLEAR(x) memset(&(x), 0, sizeof(x))
static void xioctl(int fh, unsigned long int request, void *arg)
{
int ret;
do {
ret = v4l2_ioctl(fh, request, arg);
} while (ret == -1 && ((errno == EINTR) || (errno == EAGAIN)));
if (ret == -1) {
qCritical("V4L2 ioctl error: %d", errno);
}
}
void
V4LThread::OpenSource(const char *filename)
{
struct v4l2_buffer buf;
struct v4l2_requestbuffers req;
enum v4l2_buf_type type;
unsigned int i;
recebuf_len = 0;
// fd = v4l2_open(filename, O_RDWR | O_NONBLOCK, 0);
fd = open(filename, O_RDWR | O_NONBLOCK, 0);
if (fd < 0) {
qCritical("Cannot open /dev/swradio0 :%d", fd);
return;
}
set_sample_rate( (double)SAMPLERATE );
set_center_freq( (double)centerFreq );
set_bandwidth( (double)IF_BANDWIDTH );
set_tuner_gain( (double) 6.0);
struct v4l2_format fmt;
pixelformat = V4L2_PIX_FMT_SDR_CS14LE;
CLEAR(fmt);
fmt.type = V4L2_BUF_TYPE_SDR_CAPTURE;
fmt.fmt.sdr.pixelformat = pixelformat;
xioctl(fd, VIDIOC_S_FMT, &fmt);
qCritical(" Expecting format CS14LE, got : %4.4s", (char *)&fmt.fmt.sdr.pixelformat);
CLEAR(req);
req.count = 8;
req.type = V4L2_BUF_TYPE_SDR_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
xioctl(fd, VIDIOC_REQBUFS, &req);
buffers = (struct v4l_buffer*) calloc(req.count, sizeof(*buffers));
for (n_buffers = 0; n_buffers < req.count; n_buffers++) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
xioctl(fd, VIDIOC_QUERYBUF, &buf);
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = v4l2_mmap(NULL, buf.length,
PROT_READ | PROT_WRITE, MAP_SHARED,
fd, buf.m.offset);
if (buffers[n_buffers].start == MAP_FAILED) {
qCritical("V4L2 buffer mmap failed");
}
}
for (i = 0; i < n_buffers; i++) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
xioctl(fd, VIDIOC_QBUF, &buf);
}
// start streaming
type = V4L2_BUF_TYPE_SDR_CAPTURE;
xioctl(fd, VIDIOC_STREAMON, &type);
}
void
V4LThread::CloseSource()
{
unsigned int i;
enum v4l2_buf_type type;
// stop streaming
type = V4L2_BUF_TYPE_SDR_CAPTURE;
xioctl(fd, VIDIOC_STREAMOFF, &type);
for (i = 0; i < n_buffers; i++)
v4l2_munmap(buffers[i].start, buffers[i].length);
v4l2_close(fd);
fd = -1;
}
void
V4LThread::set_sample_rate(double samp_rate)
{
struct v4l2_frequency frequency;
memset (&frequency, 0, sizeof(frequency));
frequency.tuner = 0;
frequency.type = V4L2_TUNER_ADC;
frequency.frequency = samp_rate;
xioctl(fd, VIDIOC_S_FREQUENCY, &frequency);
}
// Cannot change freq while streaming
void
V4LThread::set_center_freq(double freq)
{
struct v4l2_frequency frequency;
if (fd <= 0)
return;
memset (&frequency, 0, sizeof(frequency));
frequency.tuner = 1;
frequency.type = V4L2_TUNER_RF;
frequency.frequency = freq;
xioctl(fd, VIDIOC_S_FREQUENCY, &frequency);
}
void
V4LThread::set_bandwidth(double bandwidth)
{
struct v4l2_ext_controls ext_ctrls;
struct v4l2_ext_control ext_ctrl;
if (fd <= 0)
return;
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
ext_ctrl.id = CID_TUNER_BW_AUTO;
ext_ctrl.value = 0;
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.ctrl_class = CID_CLASS_RF;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
xioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls);
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
ext_ctrl.id = CID_TUNER_BW;
ext_ctrl.value = bandwidth;
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.ctrl_class = CID_CLASS_RF;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
xioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls);
}
void
V4LThread::set_tuner_gain(double gain)
{
struct v4l2_ext_controls ext_ctrls;
struct v4l2_ext_control ext_ctrl;
if (fd <= 0)
return;
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
ext_ctrl.id = CID_TUNER_IF_GAIN;
ext_ctrl.value = gain;
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.ctrl_class = CID_CLASS_RF;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
xioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls);
}
void
V4LThread::set_amps(bool lna, bool on)
{
struct v4l2_ext_controls ext_ctrls;
struct v4l2_ext_control ext_ctrl;
if (fd <= 0)
return;
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
if (lna)
ext_ctrl.id = CID_TUNER_LNA_GAIN;
else
ext_ctrl.id = CID_TUNER_MIXER_GAIN;
ext_ctrl.value = on;
ext_ctrls.ctrl_class = CID_CLASS_RF;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
xioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls);
}
#define CASTUP (int)(qint16)
int
V4LThread::work(int noutput_items)
{
int ret;
struct timeval tv;
struct v4l2_buffer buf;
fd_set fds;
int xreal, yimag;
uint16_t* b;
SampleVector::iterator it;
unsigned int pos = 0;
// MSI format is 252 sample pairs :( 63 * 4) * 4bytes
it = m_convertBuffer.begin();
if (recebuf_len >= 16) { // in bytes
b = (uint16_t *) recebuf_ptr;
unsigned int len = 8 * noutput_items; // decimation (i+q * 4 : cmplx)
if (len * 2 > recebuf_len)
len = recebuf_len / 2;
// Decimate by four for lower cpu usage
for (pos = 0; pos < len - 7; pos += 8) {
xreal = CASTUP(b[pos+0]<<2) + CASTUP(b[pos+2]<<2)
+ CASTUP(b[pos+4]<<2) + CASTUP(b[pos+6]<<2);
yimag = CASTUP(b[pos+1]<<2) + CASTUP(b[pos+3]<<2)
+ CASTUP(b[pos+5]<<2) + CASTUP(b[pos+7]<<2);
Sample s( (qint16)(xreal >> 2) , (qint16)(yimag >> 2) );
*it = s;
it++;
}
m_sampleFifo->write(m_convertBuffer.begin(), it);
recebuf_len -= pos * 2; // size of int16
recebuf_ptr = &b[pos];
}
// return now if there is still data in buffer, else free buffer and get another.
if (recebuf_len >= 16)
return pos / 8;
{ // free buffer, if there was one.
if (pos > 0) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = recebuf_mmap_index;
xioctl(fd, VIDIOC_QBUF, &buf);
}
/* Read data from device */
do {
FD_ZERO(&fds);
FD_SET(fd, &fds);
// Timeout
tv.tv_sec = 2;
tv.tv_usec = 0;
ret = select(fd + 1, &fds, NULL, NULL, &tv);
} while ((ret == -1 && (errno = EINTR)));
if (ret == -1) {
perror("select");
return errno;
}
/* dequeue mmap buf (receive data) */
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
xioctl(fd, VIDIOC_DQBUF, &buf);
/* store buffer in order to handle it during next call */
recebuf_ptr = buffers[buf.index].start;
recebuf_len = buf.bytesused;
recebuf_mmap_index = buf.index;
}
return pos / 8;
}
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