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Add testbench for LED blinker, enhance bram_writer with state management, and update test script for overflow/underflow handling

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This commit is contained in:
Davide Cavagnola
2025-04-17 22:55:49 +02:00
parent 667632bfa3
commit a054085341
7 changed files with 185 additions and 44 deletions
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39
LAB2/src/bram_writer.vhd
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@@ -46,7 +46,7 @@ ARCHITECTURE rtl OF bram_writer IS
);
END COMPONENT;
TYPE state_type IS (IDLE, RECEIVING, CHECK_START_CONV, CONVOLUTION);
TYPE state_type IS (IDLE, RECEIVING, CHECK_DATA, CONVOLUTION);
SIGNAL state : state_type := IDLE;
SIGNAL s_axis_tready_int : STD_LOGIC := '0';
@@ -58,6 +58,8 @@ ARCHITECTURE rtl OF bram_writer IS
SIGNAL wr_addr : STD_LOGIC_VECTOR(ADDR_WIDTH - 1 DOWNTO 0) := (OTHERS => '0'); -- Write address for BRAM
SIGNAL overflow_flag : STD_LOGIC := '0'; -- Overflow flag for BRAM write
BEGIN
-- Instantiate BRAM controller
@@ -100,6 +102,8 @@ BEGIN
write_ok <= '0';
overflow <= '0';
underflow <= '0';
overflow_flag <= '0';
ELSE
-- Default assignments for each clock cycle
start_conv <= '0';
@@ -126,24 +130,27 @@ BEGIN
IF s_axis_tvalid = '1' AND s_axis_tready_int = '1' THEN
-- Check for overflow: if address reaches max image size
IF unsigned(wr_addr) = (IMG_SIZE ** 2 - 1) THEN
overflow <= '1';
state <= IDLE;
ELSE
-- Increment write address and write data to BRAM
wr_addr <= STD_LOGIC_VECTOR(unsigned(wr_addr) + 1);
bram_we <= '1'; -- Enable write to BRAM
bram_data_in <= s_axis_tdata; -- Write data to BRAM
overflow_flag <= '1';
END IF;
-- Check for last data signal
IF s_axis_tlast = '1' THEN
state <= CHECK_START_CONV;
END IF;
-- Increment write address and write data to BRAM
wr_addr <= STD_LOGIC_VECTOR(unsigned(wr_addr) + 1);
bram_we <= '1'; -- Enable write to BRAM
bram_data_in <= s_axis_tdata; -- Write data to BRAM
-- Check for last data signal
IF s_axis_tlast = '1' THEN
state <= CHECK_DATA;
END IF;
END IF;
WHEN CHECK_START_CONV =>
-- Check for underflow: if not enough data received
IF unsigned(wr_addr) < (IMG_SIZE ** 2 - 2) THEN
WHEN CHECK_DATA =>
-- Check for overflow/underflow
IF overflow_flag = '1' THEN
overflow <= '1';
overflow_flag <= '0';
state <= IDLE;
ELSIF unsigned(wr_addr) < (IMG_SIZE ** 2 - 1) THEN
underflow <= '1';
state <= IDLE;
ELSE