Cant Decrement Clock!??

[Altera_Forum]

I've been messing around with this program for quite a while now and have run out of ideas. Im can t get the clock to increment when enable -which is assigned to a switch- is high, but I am not able to get the clock to decrement when enable is low. Any help or insight is appreciated.  

Thanks.     Signal counter, counter2 : INTEGER;   PROCESS(enable, clock_50) --VARIABLE counter: INTEGER;   BEGIN  IF(clock_50 = '1' AND clock_50'EVENT) then  IF(enable = '1') THEN  IF (counter = 52428800/15) THEN --Speed of the on board clk (50Mhz)  counter <= 0;  toggle_clk <= NOT toggle_clk;  ELSE  counter <= counter + 1;  counter2 <= counter2 + 1;  END IF;  ELSE    counter <= 0;  toggle_clk <= '0';  END IF;  END IF; END PROCESS;  --Decelarate PROCESS(enable, clock_50) --VARIABLE counter2: INTEGER;  BEGIN counter2 <= counter; toggle_clk2 <= toggle_clk;  IF(clock_50 = '1' AND clock_50'EVENT) then  IF(enable = '0') THEN  IF (counter2 = 52428800/22) THEN --Speed of the on board clk (50Mhz)  counter2 <= 0;  toggle_clk2 <= not toggle_clk2;  ELSE  counter2 <= counter2 - 1;  --counter <= counter -1;  END IF;  ELSE  counter2 <= 0;  toggle_clk2 <= '0';  END IF;  END IF; END PROCESS;

[Altera_Forum]

First you are assigning a value to counter2 from both processes, which will give strong results in simulation and will give you an error when synthesizing. 

Second, in your decelerate process, you must remember that the complete process is executed each time there is a change on the sensitivity list. This means that at each change of enable or clock_50 (including falling edges) the first two lines will be executed, and you set the values of counter2 and toggle_clk2 with counter and toggle_clk. This will probably cancel the decreasing you wanted to do.  Why don't you put everything in a single process?