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dsp_sos_filter_pkg.vhd
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dsp_sos_filter_pkg.vhd
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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.sos_filter_pkg.all;
use work.fixed_point_dsp_pkg.all;
package dsp_sos_filter_pkg is
------------------------------------------------------------------------
type sos_filter_record is record
y, x1, x2, u : integer;
state_counter : integer;
result_counter : integer;
sos_filter_is_ready : boolean;
sos_filter_output_is_ready : boolean;
end record;
constant init_sos_filter : sos_filter_record := (0,0,0,0,5,5,false,false);
------------------------------------------------------------------------
procedure create_sos_filter (
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
b_gains : in fix_array;
a_gains : in fix_array);
procedure create_sos_filter_and_dsp (
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
b_gains : in fix_array;
a_gains : in fix_array);
procedure create_ram_sos_filter (
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
filter_gains : in integer;
signal filter_gain_address : out integer;
filter_gain_is_ready : in boolean);
------------------------------------------------------------------------
procedure request_sos_filter (
signal sos_filter : out sos_filter_record;
input_signal : in integer);
------------------------------------------------------------------------
function get_sos_filter_output ( sos_filter : sos_filter_record)
return integer;
------------------------------------------------------------------------
procedure cascade_sos_filters (
signal triggering_sos_filter : inout sos_filter_record;
signal triggered_sos_filter : inout sos_filter_record);
------------------------------------------------------------------------
function sos_filter_out_is_ready ( sos_filter : sos_filter_record)
return boolean;
------------------------------------------------------------------------
end package dsp_sos_filter_pkg;
package body dsp_sos_filter_pkg is
------------------------------------------------------------------------
procedure create_sos_filter
(
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
b_gains : in fix_array;
a_gains : in fix_array
) is
begin
self.sos_filter_output_is_ready <= false;
self.sos_filter_is_ready <= false;
if self.state_counter < 5 then
self.state_counter <= self.state_counter + 1;
end if;
if self.result_counter < 5 and fixed_point_dsp_is_ready(dsp) then
self.result_counter <= self.result_counter + 1;
end if;
------------------------------
CASE self.state_counter is
WHEN 0 => multiply_add(dsp , self.u , b_gains(0) , self.x1);
WHEN 1 => multiply_add(dsp , self.u , b_gains(1) , self.x2);
WHEN 2 => multiply(dsp , self.u , b_gains(2));
WHEN 3 => multiply_add(dsp , self.y , -a_gains(1) , self.x1);
WHEN 4 => multiply_add(dsp , self.y , -a_gains(2) , self.x2);
WHEN others => -- do nothing
end CASE;
------------------------------
if fixed_point_dsp_is_ready(dsp) then
CASE self.result_counter is
WHEN 0 => self.y <= get_dsp_result(dsp); self.sos_filter_output_is_ready <= true;
WHEN 1 => self.x1 <= get_dsp_result(dsp);
WHEN 2 => self.x2 <= get_dsp_result(dsp);
WHEN 3 => self.x1 <= get_dsp_result(dsp);
WHEN 4 => self.x2 <= get_dsp_result(dsp); self.sos_filter_is_ready <= true;
WHEN others => -- do nothing
end CASE;
end if;
------------------------------
end create_sos_filter;
------------------------------------------------------------------------
procedure create_ram_sos_filter
(
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
filter_gains : in integer;
signal filter_gain_address : out integer;
filter_gain_is_ready : in boolean
) is
begin
self.sos_filter_output_is_ready <= false;
self.sos_filter_is_ready <= false;
if self.state_counter < 5 then
self.state_counter <= self.state_counter + 1;
end if;
if self.result_counter < 5 and fixed_point_dsp_is_ready(dsp) then
self.result_counter <= self.result_counter + 1;
end if;
------------------------------
CASE self.state_counter is
WHEN 0 => multiply_add(dsp , self.u , filter_gains , self.x1);
WHEN 1 => multiply_add(dsp , self.u , filter_gains , self.x2);
WHEN 2 => multiply(dsp , self.u , filter_gains);
WHEN 3 => multiply_add(dsp , self.y , -filter_gains , self.x1);
WHEN 4 => multiply_add(dsp , self.y , -filter_gains , self.x2);
WHEN others => -- do nothing
end CASE;
------------------------------
if fixed_point_dsp_is_ready(dsp) then
CASE self.result_counter is
WHEN 0 => self.y <= get_dsp_result(dsp); self.sos_filter_output_is_ready <= true;
WHEN 1 => self.x1 <= get_dsp_result(dsp);
WHEN 2 => self.x2 <= get_dsp_result(dsp);
WHEN 3 => self.x1 <= get_dsp_result(dsp);
WHEN 4 => self.x2 <= get_dsp_result(dsp); self.sos_filter_is_ready <= true;
WHEN others => -- do nothing
end CASE;
end if;
------------------------------
end create_ram_sos_filter;
------------------------------------------------------------------------
procedure create_sos_filter_and_dsp
(
signal self : inout sos_filter_record;
signal dsp : inout fixed_point_dsp_record;
b_gains : in fix_array;
a_gains : in fix_array
) is
begin
create_fixed_point_dsp(dsp);
create_sos_filter(self, dsp, b_gains, a_gains);
end create_sos_filter_and_dsp;
------------------------------------------------------------------------
procedure request_sos_filter
(
signal sos_filter : out sos_filter_record;
input_signal : in integer
) is
begin
sos_filter.u <= input_signal;
sos_filter.result_counter <= 0;
sos_filter.state_counter <= 0;
end request_sos_filter;
------------------------------------------------------------------------
function get_sos_filter_output
(
sos_filter : sos_filter_record
)
return integer
is
begin
return sos_filter.y;
end get_sos_filter_output;
------------------------------------------------------------------------
procedure cascade_sos_filters
(
signal triggering_sos_filter : inout sos_filter_record;
signal triggered_sos_filter : inout sos_filter_record
) is
begin
if sos_filter_out_is_ready(triggering_sos_filter) then
request_sos_filter(triggered_sos_filter, get_sos_filter_output(triggering_sos_filter));
end if;
end cascade_sos_filters;
------------------------------------------------------------------------
function sos_filter_out_is_ready
(
sos_filter : sos_filter_record
)
return boolean
is
begin
return sos_filter.sos_filter_output_is_ready;
end sos_filter_out_is_ready;
------------------------------------------------------------------------
end package body dsp_sos_filter_pkg;