VGA_ansteuereung: process (clock_50, reset, LCD_DATA, LCD_EN, LCD_RS, sonderzeichen, vga_valid, enable, en_rise, en_fall, en_old, lcd_en_old, lcd_en_fall, state, state2)

begin

if reset = '0' then
	rx_done_tick_sig <= '0';
	vga_out_sig <= (others => '0');
	lcd_en_fall <= '0';
	en_old <= '0';
	en_fall <= '0';
	en_rise <= '0';
	state <= 0;
	state2 <= 0;
	
	
elsif clock_50'event and clock_50 ='1' then
		lcd_en_old <= LCD_EN;
		en_old <= enable;
		
		if en_old ='0' and enable = '1' then --nun in encoder modus
			en_rise <='1';
			rx_done_tick_sig <= '0';
		else
			en_rise <='0';
		end if;
		
		if en_old ='1' and enable = '0' then --nun im decoder modus!!!
			en_fall <='1';
			rx_done_tick_sig <= '0';
		else
			en_fall <='0';
		end if;
		
		if lcd_en_old ='1' and LCD_EN = '0' then --Für Eigegebene Zeichen, liegen nur an wenn LCD_EN auf '0' steht (siehe ini:=8)
			lcd_en_fall <= '1';
		else 
			lcd_en_fall <= '0';
		end if;
		
		if (en_rise ='1' or state > 0) and vga_valid = '1' then -- schreibe "ENC: "
			case state is
			when 0=>
				vga_out_sig <= "01011010"; --ENTER
				rx_done_tick_sig <= '1';--
				state <= state +1;
			when 1=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 2=>
				vga_out_sig <= x"45"; --"E"
				rx_done_tick_sig <= '1';--
				state <= state +1;
			when 3=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 4=>
				vga_out_sig <=x"4E"; --"N"
			   rx_done_tick_sig <= '1';--
				state <= state +1;
			when 5=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 6=>
				vga_out_sig <= x"43"; --"C"
				rx_done_tick_sig <= '1';--
				state <= state +1;
			when 7=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 8=>
				vga_out_sig <= x"3A"; --":"
			   rx_done_tick_sig <= '1';--
				state <= state +1;
			when 9=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 10=>
				vga_out_sig <= x"20"; --" "
			   rx_done_tick_sig <= '1';--
				state <= state +1;	
			when 11=>
				rx_done_tick_sig <= '0';--
				state <= state +1;
			when 12 =>
				en_rise <= '0';
				state <= 13;
			when others =>
				state <= 0;
			end case;
		
		
		elsif (en_fall ='1' or state2 > 0 ) and vga_valid = '1' then -- schreibe "DEC: "
			case state2 is
			when 0=>
				vga_out_sig <= "01011010"; --ENTER
				rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 1=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 2=>
				vga_out_sig <= x"44"; --"D"
				rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 3=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 4=>
				vga_out_sig <=x"45"; --"E"
			   rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 5=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 6=>
				vga_out_sig <= x"43"; --"C"
				rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 7=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 8=>
				vga_out_sig <= x"3A"; --":"
			   rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 9=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 10=>
				vga_out_sig <= x"20"; --" "
			   rx_done_tick_sig <= '1';--
				state2 <= state2 +1;
			when 11=>
				rx_done_tick_sig <= '0';--
				state2 <= state2 +1;
			when 12 =>
				en_fall <= '0';
				state2 <= 13;
			when others =>
				state2 <= 0;
			end case;
		
		
		
		elsif lcd_en_fall = '1' and vga_valid = '1' then 
			if sonderzeichen = "000" then 			--buchstaben
				vga_out_sig <= LCD_DATA;
				rx_done_tick_sig <='1';
				
			elsif sonderzeichen /= "000" then --elsif LCD_RS ='0' then
				case sonderzeichen is
					when "100" => --enter
						vga_out_sig <= "01011010"; --PS2 code für enter
					when "110" => --backspace
						vga_out_sig <="01100110"; --Ps2 code für backspace
					when "001" => --left arrow
						vga_out_sig <= "01101011"; ---etc. etc.
					when "011" => --right arrow
						vga_out_sig <= "01110100";
					when "101" => 	--entf
						vga_out_sig <= x"20";
					when others =>
						vga_out_sig <= x"00"; 
				end case;
				rx_done_tick_sig <= '1';
				lcd_en_fall <= '0';			
			end if;
		else
			rx_done_tick_sig <= '0';
		end if;
			
end if;
		rx_done_tick <= rx_done_tick_sig;
		vga_out <= vga_out_sig;
end process;