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//
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhd/exception.hpp>
#include <uhd/rfnoc/defaults.hpp>
#include <uhd/rfnoc/fft_block_control.hpp>
#include <uhd/rfnoc/registry.hpp>
#include <string>
using namespace uhd::rfnoc;
namespace {
constexpr int DEFAULT_LENGTH = 256;
constexpr fft_shift DEFAULT_SHIFT = fft_shift::NORMAL;
constexpr fft_direction DEFAULT_DIRECTION = fft_direction::FORWARD;
constexpr fft_magnitude DEFAULT_MAGNITUDE = fft_magnitude::COMPLEX;
constexpr int DEFAULT_FFT_SCALING = 1706; // Conservative 1/N scaling
// FFT IP constraints
constexpr int MIN_FFT_LENGTH = 8;
constexpr int MAX_FFT_LENGTH = 1024;
const uhd::rfnoc::io_type_t DEFAULT_TYPE = uhd::rfnoc::IO_TYPE_SC16;
} // namespace
const uint32_t fft_block_control::REG_RESET_ADDR = 131 * 8;
const uint32_t fft_block_control::REG_LENGTH_LOG2_ADDR = 132 * 8;
const uint32_t fft_block_control::REG_MAGNITUDE_OUT_ADDR = 133 * 8;
const uint32_t fft_block_control::REG_DIRECTION_ADDR = 134 * 8;
const uint32_t fft_block_control::REG_SCALING_ADDR = 135 * 8;
const uint32_t fft_block_control::REG_SHIFT_CONFIG_ADDR = 136 * 8;
class fft_block_control_impl : public fft_block_control
{
public:
RFNOC_BLOCK_CONSTRUCTOR(fft_block_control)
{
set_prop_forwarding_policy(forwarding_policy_t::ONE_TO_ONE);
set_action_forwarding_policy(forwarding_policy_t::ONE_TO_ONE);
_reset();
_register_props();
}
void set_direction(const fft_direction direction) override
{
set_property<int>(PROP_KEY_DIRECTION, static_cast<int>(direction));
}
fft_direction get_direction() const override
{
return static_cast<fft_direction>(_direction.get());
}
void set_magnitude(const fft_magnitude magnitude) override
{
set_property<int>(PROP_KEY_MAGNITUDE, static_cast<int>(magnitude));
}
fft_magnitude get_magnitude() const override
{
return static_cast<fft_magnitude>(_magnitude.get());
}
void set_shift_config(const fft_shift shift) override
{
set_property<int>(PROP_KEY_SHIFT_CONFIG, static_cast<int>(shift));
}
fft_shift get_shift_config() const override
{
return static_cast<fft_shift>(_shift.get());
}
void set_scaling(const uint16_t scaling) override
{
set_property<int>(PROP_KEY_FFT_SCALING, scaling);
}
uint16_t get_scaling() const override
{
return static_cast<uint16_t>(_scaling.get());
}
void set_length(const size_t size) override
{
set_property<int>(PROP_KEY_LENGTH, size);
}
size_t get_length() const override
{
return static_cast<size_t>(_length.get());
}
private:
void _reset()
{
regs().poke32(REG_RESET_ADDR, uint32_t(1));
regs().poke32(REG_RESET_ADDR, uint32_t(0));
}
/**************************************************************************
* Initialization
*************************************************************************/
void _register_props()
{
// register block specific properties
register_property(&_length);
add_property_resolver({&_length}, {&_length}, [this]() {
size_t length = this->_length.get();
if (length < MIN_FFT_LENGTH || length > MAX_FFT_LENGTH) {
throw uhd::value_error("Size value must be in ["
+ std::to_string(MIN_FFT_LENGTH) + ", "
+ std::to_string(MAX_FFT_LENGTH) + "]");
}
// Find the log2(length) via highest bit set
size_t length_log2 = 0;
size_t old_length = length;
while ((length >>= 1) != 0) {
length_log2++;
}
size_t coerced_length = (1 << length_log2);
if (old_length != coerced_length) {
RFNOC_LOG_WARNING("Length "
<< old_length
<< " not an integral power of two; coercing to "
<< coerced_length);
this->_length.set(coerced_length);
}
this->regs().poke32(REG_LENGTH_LOG2_ADDR, uint32_t(length_log2));
});
register_property(&_magnitude, [this]() {
int mag = this->_magnitude.get();
if (mag < static_cast<int>(fft_magnitude::COMPLEX)
|| mag > static_cast<int>(fft_magnitude::MAGNITUDE_SQUARED)) {
throw uhd::value_error("Magnitude value must be [0, 2]");
}
this->regs().poke32(REG_MAGNITUDE_OUT_ADDR, uint32_t(mag));
});
register_property(&_direction, [this]() {
int dir = _direction.get();
if (dir < static_cast<int>(fft_direction::REVERSE)
|| dir > static_cast<int>(fft_direction::FORWARD)) {
throw uhd::value_error("Direction value must be in [0, 1]");
}
this->regs().poke32(REG_DIRECTION_ADDR, uint32_t(dir));
});
register_property(&_scaling, [this]() {
int scale = _scaling.get();
if (scale < 0 || scale > (1 << 12) - 1) {
throw uhd::value_error("Scale value must be in [0, 4095]");
}
this->regs().poke32(REG_SCALING_ADDR, uint32_t(scale));
});
register_property(&_shift, [this]() {
int shift = this->_shift.get();
if (shift < static_cast<int>(fft_shift::NORMAL)
|| shift > static_cast<int>(fft_shift::NATURAL)) {
throw uhd::value_error("Shift value must be [0, 2]");
}
this->regs().poke32(REG_SHIFT_CONFIG_ADDR, uint32_t(shift));
});
// register edge properties
register_property(&_type_in);
register_property(&_type_out);
// add resolvers for type (keeps it constant)
add_property_resolver({&_type_in}, {&_type_in}, [& type_in = _type_in]() {
type_in.set(IO_TYPE_SC16);
});
add_property_resolver({&_type_out}, {&_type_out}, [& type_out = _type_out]() {
type_out.set(IO_TYPE_SC16);
});
}
property_t<int> _length{PROP_KEY_LENGTH, DEFAULT_LENGTH, {res_source_info::USER}};
property_t<int> _magnitude = property_t<int>{
PROP_KEY_MAGNITUDE, static_cast<int>(DEFAULT_MAGNITUDE), {res_source_info::USER}};
property_t<int> _direction = property_t<int>{
PROP_KEY_DIRECTION, static_cast<int>(DEFAULT_DIRECTION), {res_source_info::USER}};
property_t<int> _scaling = property_t<int>{
PROP_KEY_FFT_SCALING, DEFAULT_FFT_SCALING, {res_source_info::USER}};
property_t<int> _shift = property_t<int>{
PROP_KEY_SHIFT_CONFIG, static_cast<int>(DEFAULT_SHIFT), {res_source_info::USER}};
property_t<std::string> _type_in = property_t<std::string>{
PROP_KEY_TYPE, IO_TYPE_SC16, {res_source_info::INPUT_EDGE}};
property_t<std::string> _type_out = property_t<std::string>{
PROP_KEY_TYPE, IO_TYPE_SC16, {res_source_info::OUTPUT_EDGE}};
};
UHD_RFNOC_BLOCK_REGISTER_DIRECT(
fft_block_control, FFT_BLOCK, "FFT", CLOCK_KEY_GRAPH, "bus_clk")
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