add sawtooth

01-WaveformGenerator/WaveformGenerator/hdl/sawtoothGen_studentVersion.vhd

@@ -1,5 +1,21 @@
 ARCHITECTURE studentVersion OF sawtoothGen IS
+
+	signal counter : unsigned(bitNb-1 downto 0);
+	
 BEGIN
-  sawtooth <= (others => '0');
+
+	count: process(reset, clock, en, step)
+	begin
+		if reset = '1' then
+			counter <= (others => '0');
+		elsif rising_edge(clock) then
+			if en = '1' then
+				counter <= counter + step;
+			end if;
+		end if;
+	end process count;
+	
+	sawtooth <= counter;
+
 END ARCHITECTURE studentVersion;