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ad9361_baseband_auto_rate.c
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ad9361_baseband_auto_rate.c
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/*
* Copyright (C) 2016 Analog Devices, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*/
#include "ad9361.h"
#include <errno.h>
#include <iio.h>
#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif
#ifdef _MSC_BUILD
#define snprintf sprintf_s
#endif
static int16_t fir_128_4[] = {
-15,-27,-23,-6,17,33,31,9,-23,-47,-45,-13,34,69,67,21,-49,-102,-99,-32,69,146,143,48,-96,-204,-200,-69,129,278,275,97,-170,
-372,-371,-135,222,494,497,187,-288,-654,-665,-258,376,875,902,363,-500,-1201,-1265,-530,699,1748,1906,845,-1089,-2922,-3424,
-1697,2326,7714,12821,15921,15921,12821,7714,2326,-1697,-3424,-2922,-1089,845,1906,1748,699,-530,-1265,-1201,-500,363,902,875,
376,-258,-665,-654,-288,187,497,494,222,-135,-371,-372,-170,97,275,278,129,-69,-200,-204,-96,48,143,146,69,-32,-99,-102,-49,21,
67,69,34,-13,-45,-47,-23,9,31,33,17,-6,-23,-27,-15};
static int16_t fir_128_2[] = {
-0,0,1,-0,-2,0,3,-0,-5,0,8,-0,-11,0,17,-0,-24,0,33,-0,-45,0,61,-0,-80,0,104,-0,-134,0,169,-0,
-213,0,264,-0,-327,0,401,-0,-489,0,595,-0,-724,0,880,-0,-1075,0,1323,-0,-1652,0,2114,-0,-2819,0,4056,-0,-6883,0,20837,32767,
20837,0,-6883,-0,4056,0,-2819,-0,2114,0,-1652,-0,1323,0,-1075,-0,880,0,-724,-0,595,0,-489,-0,401,0,-327,-0,264,0,-213,-0,
169,0,-134,-0,104,0,-80,-0,61,0,-45,-0,33,0,-24,-0,17,0,-11,-0,8,0,-5,-0,3,0,-2,-0,1,0,-0, 0 };
static int16_t fir_96_2[] = {
-4,0,8,-0,-14,0,23,-0,-36,0,52,-0,-75,0,104,-0,-140,0,186,-0,-243,0,314,-0,-400,0,505,-0,-634,0,793,-0,
-993,0,1247,-0,-1585,0,2056,-0,-2773,0,4022,-0,-6862,0,20830,32767,20830,0,-6862,-0,4022,0,-2773,-0,2056,0,-1585,-0,1247,0,-993,-0,
793,0,-634,-0,505,0,-400,-0,314,0,-243,-0,186,0,-140,-0,104,0,-75,-0,52,0,-36,-0,23,0,-14,-0,8,0,-4,0};
static int16_t fir_64_2[] = {
-58,0,83,-0,-127,0,185,-0,-262,0,361,-0,-488,0,648,-0,-853,0,1117,-0,-1466,0,1954,-0,-2689,0,3960,-0,-6825,0,20818,32767,
20818,0,-6825,-0,3960,0,-2689,-0,1954,0,-1466,-0,1117,0,-853,-0,648,0,-488,-0,361,0,-262,-0,185,0,-127,-0,83,0,-58,0};
#define FIR_BUF_SIZE 8192
int ad9361_set_trx_fir_enable(struct iio_device *dev, int enable)
{
int ret = iio_device_attr_write_bool(dev,
"in_out_voltage_filter_fir_en", !!enable);
if (ret < 0)
ret = iio_channel_attr_write_bool(iio_device_find_channel(dev, "out", false),
"voltage_filter_fir_en", !!enable);
return ret;
}
int ad9361_get_trx_fir_enable(struct iio_device *dev, int *enable)
{
bool value;
int ret = iio_device_attr_read_bool(dev, "in_out_voltage_filter_fir_en", &value);
if (ret < 0)
ret = iio_channel_attr_read_bool(iio_device_find_channel(dev, "out", false),
"voltage_filter_fir_en", &value);
if (!ret)
*enable = value;
return ret;
}
int ad9361_set_bb_rate(struct iio_device *dev, unsigned long rate)
{
struct iio_channel *chan;
long long current_rate;
int dec, taps, ret, i, enable, len = 0;
int16_t *fir;
char *buf;
if (rate <= 20000000UL) {
dec = 4;
taps = 128;
fir = fir_128_4;
} else if (rate <= 40000000UL) {
dec = 2;
fir = fir_128_2;
taps = 128;
} else if (rate <= 53333333UL) {
dec = 2;
fir = fir_96_2;
taps = 96;
} else {
dec = 2;
fir = fir_64_2;
taps = 64;
}
chan = iio_device_find_channel(dev, "voltage0", true);
if (chan == NULL)
return -ENODEV;
ret = iio_channel_attr_read_longlong(chan, "sampling_frequency", ¤t_rate);
if (ret < 0)
return ret;
ret = ad9361_get_trx_fir_enable(dev, &enable);
if (ret < 0)
return ret;
if (enable) {
if (current_rate <= (25000000 / 12))
iio_channel_attr_write_longlong(chan, "sampling_frequency", 3000000);
ret = ad9361_set_trx_fir_enable(dev, false);
if (ret < 0)
return ret;
}
buf = malloc(FIR_BUF_SIZE);
if (!buf)
return -ENOMEM;
len += snprintf(buf + len, FIR_BUF_SIZE - len, "RX 3 GAIN -6 DEC %d\n", dec);
len += snprintf(buf + len, FIR_BUF_SIZE - len, "TX 3 GAIN 0 INT %d\n", dec);
for (i = 0; i < taps; i++)
len += snprintf(buf + len, FIR_BUF_SIZE - len, "%d,%d\n", fir[i], fir[i]);
len += snprintf(buf + len, FIR_BUF_SIZE - len, "\n");
ret = iio_device_attr_write_raw(dev, "filter_fir_config", buf, len);
free (buf);
if (ret < 0)
return ret;
if (rate <= (25000000 / 12)) {
int dacrate, txrate, max;
char readbuf[100];
ret = iio_device_attr_read(dev, "tx_path_rates", readbuf, sizeof(readbuf));
if (ret < 0)
return ret;
ret = sscanf(readbuf, "BBPLL:%*d DAC:%d T2:%*d T1:%*d TF:%*d TXSAMP:%d", &dacrate, &txrate);
if (ret != 2)
return -EFAULT;
if (txrate == 0)
return -EINVAL;
max = (dacrate / txrate) * 16;
if (max < taps)
iio_channel_attr_write_longlong(chan, "sampling_frequency", 3000000);
ret = ad9361_set_trx_fir_enable(dev, true);
if (ret < 0)
return ret;
ret = iio_channel_attr_write_longlong(chan, "sampling_frequency", rate);
if (ret < 0)
return ret;
} else {
ret = iio_channel_attr_write_longlong(chan, "sampling_frequency", rate);
if (ret < 0)
return ret;
ret = ad9361_set_trx_fir_enable(dev, true);
if (ret < 0)
return ret;
}
return 0;
}