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Refactor balance_controller and volume_multiplier for improved readability; update simulation settings in project files

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This commit is contained in:
Davide Cavagnola
2025-05-22 16:31:10 +02:00
parent 1d779b7d3a
commit fd7bac0da1
5 changed files with 31 additions and 43 deletions
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22
LAB3/src/balance_controller.vhd
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@@ -30,8 +30,7 @@ ARCHITECTURE Behavioral OF balance_controller IS
CONSTANT BALANCE_STEPS : INTEGER := (2 ** (BALANCE_WIDTH - 1)) / (2 ** BALANCE_STEP_2) + 1;
CONSTANT BAL_MID : INTEGER := 2 ** (BALANCE_WIDTH - 1); -- 512 for 10 bit
CONSTANT BLOCK_SIZE : INTEGER := 2 ** BALANCE_STEP_2;
CONSTANT DEAD_ZONE : INTEGER := BLOCK_SIZE / 2;
CONSTANT DEAD_ZONE : INTEGER := (2 ** BALANCE_STEP_2) / 2;
SIGNAL left_channel : INTEGER RANGE 0 TO BALANCE_STEPS := 0;
SIGNAL right_channel : INTEGER RANGE 0 TO BALANCE_STEPS := 0;
@@ -41,10 +40,12 @@ ARCHITECTURE Behavioral OF balance_controller IS
BEGIN
-- Assigning the output signals
m_axis_tvalid <= m_axis_tvalid_int;
s_axis_tready <= m_axis_tready AND aresetn;
s_axis_tready <= (m_axis_tready OR NOT m_axis_tvalid_int) AND aresetn; -- Chiedere e in caso togliere 'AND aresetn'
-- Balance to exp
PROCESS (aclk)
-- Balance to exp process to avoid changing the balance value when multiplying it for the sample data
BALANCE_CALC : PROCESS (aclk)
BEGIN
IF rising_edge(aclk) THEN
@@ -56,13 +57,13 @@ BEGIN
ELSE
-- Balance left and right channels
IF unsigned(balance) > (BAL_MID + DEAD_ZONE) THEN
left_channel <= to_integer((unsigned(balance) - (BAL_MID + DEAD_ZONE)) SRL BALANCE_STEP_2) + 1;
left_channel <= to_integer((unsigned(balance) - to_unsigned(BAL_MID + DEAD_ZONE, balance'length)) SRL BALANCE_STEP_2) + 1; -- +1 due to shift approximation defect
ELSE
left_channel <= 0;
END IF;
IF unsigned(balance) < (BAL_MID - DEAD_ZONE) THEN
right_channel <= to_integer(((BAL_MID - DEAD_ZONE) - unsigned(balance)) SRL BALANCE_STEP_2) + 1;
right_channel <= to_integer((to_unsigned(BAL_MID - DEAD_ZONE, balance'length) - unsigned(balance)) SRL BALANCE_STEP_2) + 1;
ELSE
right_channel <= 0;
END IF;
@@ -71,10 +72,10 @@ BEGIN
END IF;
END PROCESS;
END PROCESS BALANCE_CALC;
-- Handle AXIS stream
PROCESS (aclk)
AXIS : PROCESS (aclk)
BEGIN
IF rising_edge(aclk) THEN
@@ -82,7 +83,6 @@ BEGIN
IF aresetn = '0' THEN
m_axis_tvalid_int <= '0';
m_axis_tlast <= '0';
m_axis_tdata <= (OTHERS => '0');
ELSE
-- Default output signals
@@ -113,6 +113,6 @@ BEGIN
END IF;
END PROCESS;
END PROCESS AXIS;
END Behavioral;

32
LAB3/src/volume_multiplier.vhd
View File

@@ -29,6 +29,8 @@ END volume_multiplier;
ARCHITECTURE Behavioral OF volume_multiplier IS
CONSTANT VOLUME_STEPS : INTEGER := (2 ** (VOLUME_WIDTH - 1)) / (2 ** VOLUME_STEP_2) + 1;
CONSTANT VOL_MID : INTEGER := 2 ** (VOLUME_WIDTH - 1); -- 512 for 10 bit
CONSTANT DEAD_ZONE : INTEGER := (2 ** VOLUME_STEP_2) / 2;
SIGNAL volume_exp_mult : INTEGER RANGE -VOLUME_STEPS TO VOLUME_STEPS := 0;
@@ -37,9 +39,9 @@ ARCHITECTURE Behavioral OF volume_multiplier IS
BEGIN
-- Assigning the output signals
m_axis_tvalid <= m_axis_tvalid_int;
s_axis_tready <= m_axis_tready AND aresetn;
s_axis_tready <= (m_axis_tready OR NOT m_axis_tvalid_int) AND aresetn;
-- Volume to exp
-- Volume to exp process to avoid changing the volume value when multiplying it for the sample data
PROCESS (aclk)
BEGIN
@@ -51,7 +53,10 @@ BEGIN
ELSE
-- Volume to signed and centered and convert to power of 2 exponent
volume_exp_mult <= to_integer(
shift_right(signed('0' & volume) - to_signed(480, volume'length + 1), VOLUME_STEP_2)
shift_right(
signed('0' & volume) - to_signed(VOL_MID - DEAD_ZONE, volume'length + 1),
VOLUME_STEP_2
)
);
END IF;
@@ -69,7 +74,6 @@ BEGIN
IF aresetn = '0' THEN
m_axis_tvalid_int <= '0';
m_axis_tlast <= '0';
m_axis_tdata <= (OTHERS => '0');
ELSE
-- Default output signals
@@ -86,26 +90,10 @@ BEGIN
-- Joystick datasheet: (y-axis) a value of 0 when it is tilted all the way down
-- and a value of 1023 when it is tilted all the way up
IF volume_exp_mult >= 0 THEN
m_axis_tdata <= STD_LOGIC_VECTOR(
shift_left(
resize(
signed(s_axis_tdata),
m_axis_tdata'LENGTH
),
volume_exp_mult
)
);
m_axis_tdata <= STD_LOGIC_VECTOR(resize(shift_left(signed(s_axis_tdata), volume_exp_mult), m_axis_tdata'LENGTH));
ELSE
m_axis_tdata <= STD_LOGIC_VECTOR(
shift_right(
resize(
signed(s_axis_tdata),
m_axis_tdata'LENGTH
),
- volume_exp_mult
)
);
m_axis_tdata <= STD_LOGIC_VECTOR(resize(shift_right(signed(s_axis_tdata), - volume_exp_mult), m_axis_tdata'LENGTH));
END IF;