M1: Einfache Testbench für spi_transmitter

Milestone1/sources/spi_transmitter.vhd

@@ -67,10 +67,10 @@ begin
         if CntBitsRst = '1' then
             cntVal := to_unsigned(0, 3);
         elsif CntBitsEn = '1' then
-            cntVal := cntVal - 1;
+            cntVal := cntVal + 1;
         end if;
 
-        if cntVal = 0 then
+        if cntVal = 7 then
             CntBitsTC <= '1';
         else
             CntBitsTC <= '0';
@@ -83,7 +83,7 @@ begin
     begin
         wait until rising_edge(clk);
         if RegDataLd = '1' then
-            Q := data;               -- laden
+            Q := s_data;               -- laden
         elsif RegDataEn = '1' then
             Q := Q(6 downto 0) & '0'; -- linksschieben
         end if;
@@ -135,7 +135,6 @@ begin
                     state_next <= S_IDLE;
                 elsif CntSckTc = '1' then
                     state_next <= S_STEP_4;
-                    CntBitsEn <= '1';
                 elsif CntSckTc = '0' then
                     state_next <= S_STEP_3;
                 end if;
@@ -200,10 +199,6 @@ begin
                 ssel    <= '0';
                 sck     <= '0';
                 s_ready <= '0';
-            when S_DEAD_END =>
-                ssel    <= '1';
-                sck     <= '0';
-                s_ready <= '0';
             when S_ERROR =>
                 ssel    <= 'X';
                 sck     <= 'X';

Milestone1/sources/spi_transmitter_tb.vhd

@@ -0,0 +1,73 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity spi_transmitter_tb is
+end;
+
+architecture rtl of spi_transmitter_tb is
+
+    constant EXT_CLOCK_FREQ : integer := 125000000;
+    constant SCK_FREQ       : integer := 1000000;
+    constant AW             : POSITIVE := 8;
+
+    constant clk_half_period : time :=  1 sec / EXT_CLOCK_FREQ / 2;
+
+    signal clk     : std_logic := '0';
+    signal reset   : std_logic := '1';
+
+    signal s_data  : std_logic_vector(7 downto 0) := (others=>'0') ;
+    signal s_valid : std_logic := '0';
+    signal s_ready : std_logic;
+
+    signal sck     : std_logic;
+    signal mosi    : std_logic;
+    signal ssel    : std_logic;
+
+begin
+
+    clk_proc: process (clk)
+    begin
+        clk <= not clk after clk_half_period;
+    end process;
+
+    stim: process
+    begin
+        reset <= '0' after 100 * clk_half_period;
+
+        wait until reset = '0';
+        wait until rising_edge(clk);
+        s_data <= x"48";
+        s_valid <= '1';
+
+        loop
+            wait until rising_edge(clk);
+            if s_ready = '1' then
+                s_valid <= '0';
+                s_data <= (others=>'0');
+                exit;
+            end if;
+        end loop;
+
+        wait;
+
+    end process;
+
+    dut: entity work.spi_transmitter
+    generic map (
+        AW     => AW,
+        CLKDIV => EXT_CLOCK_FREQ / (SCK_FREQ * 4)
+    )
+    port map (
+        clk     => clk,
+        reset   => reset,
+
+        s_data  => s_data,
+        s_valid => s_valid,
+        s_ready => s_ready,
+
+        mosi    => mosi,
+        sck     => sck,
+        ssel    => ssel
+    );
+end architecture;

Milestone1/sources/test_spi_transmitter.do

@@ -0,0 +1,44 @@
+# work-Bibliothek erzeugen, falls nicht schon vorhanden
+if { [file exists work] == 0} {
+	vlib work
+}
+
+# Benoetigte Dateien uebersetzen
+vcom -work work spi_transmitter.vhd
+vcom -work work spi_transmitter_tb.vhd
+
+# Simulator starten
+vsim -voptargs=+acc spi_transmitter_tb
+
+# Breite der Namensspalte
+configure wave -namecolwidth 128
+configure wave -datasetprefix 0
+configure wave -signalnamewidth 1
+configure wave -namecolwidth 154
+configure wave -valuecolwidth 100
+set NumericStdNoWarnings 1
+
+add wave -divider "Externe Signale"
+add wave -noupdate /spi_transmitter_tb/clk
+add wave -noupdate /spi_transmitter_tb/reset
+add wave -noupdate /spi_transmitter_tb/s_data
+add wave -noupdate /spi_transmitter_tb/s_valid
+add wave -noupdate /spi_transmitter_tb/s_ready
+add wave -noupdate /spi_transmitter_tb/sck
+add wave -noupdate /spi_transmitter_tb/mosi
+add wave -noupdate /spi_transmitter_tb/ssel
+
+add wave -divider "Interne Signale"
+add wave -noupdate /spi_transmitter_tb/dut/state
+add wave -noupdate /spi_transmitter_tb/dut/state_next
+add wave -noupdate /spi_transmitter_tb/dut/CntSckTc
+add wave -noupdate /spi_transmitter_tb/dut/CntSckRst
+add wave -noupdate /spi_transmitter_tb/dut/RegDataLd
+add wave -noupdate /spi_transmitter_tb/dut/RegDataEn
+add wave -noupdate /spi_transmitter_tb/dut/CntBitsEn
+add wave -noupdate /spi_transmitter_tb/dut/CntBitsTC
+add wave -noupdate /spi_transmitter_tb/dut/CntBitsRst
+add wave -noupdate -label CntBits /spi_transmitter_tb/dut/CntBits/cntVal
+add wave -noupdate -label RegDataQ /spi_transmitter_tb/dut/RegData/Q
+
+run 1000 us