$--$ Frequency control process for sine wave

process$($clk$)$

begin

if rising$\_$edge$($clk$)$ then

if btn$\_$increase $=\text{'}1\text{'}$ then

state increase$\_$freq;

elsif btn$\_$decrease $=\text{'}1\text{'}$ then

state decrease$\_$freq;

elsif btn$\_$reset $=\text{'}1\text{'}$ then

frequency ; $--$ Reset frequency to $1$ Hz

end if;

end if;

end process;

$--$ Frequency control process for PWM WAVE

begin

if rising$\_$edge$($clk$)$ then

if btn$\_$inc$\_$duty $=\text{'}1\text{'}$ then

state increase$\_$freq;

elsif btn$\_$dec$\_$duty $=\text{'}1\text{'}$ then

state decrease$\_$freq;

elsif btn$\_$reset $=\text{'}1\text{'}$ then

frequency ; $--$ Reset frequency to $1$ Hz

end if;

end if;

end process;

$--$ State machine process

process$($clk$)$

begin

if rising$\_$edge$($clk$)$ then

case state is

when idle $=>$

$--$ Do nothing in idle state

when increase$\_$freq $=>$

if frequency $<mtext\; id="EditorElement\_1200661"></mtext><mn\; id="EditorElement\_1200662">1</mn><mn\; id="EditorElement\_1200663">0</mn><mn\; id="EditorElement\_1200664">0</mn><mn\; id="EditorElement\_1200665">0</mn>$ then

frequency frequency $+1$;

end if;

when decrease$\_$freq $=>$

if frequency $>1$ then

frequency frequency $-1$;

end if;

end case;

end if;

end process;

above is the my code snippits to utilise $6$ buttons can you fix the errors that im getting please and provide a full code that will run in my programme