Button press to change state machine - "Can't resolve multiple constant drivers..."

Ok, so here's my new code. Hopefully this is more appropriately written.

EDIT: This doesn't work, obviously. It doesn't drive the motor because cw_45 and ccw_180 are low to begin so it just throws it into the STOP state during the 'else' of the second if statement and keeps it there. Suggestions on how to fix?

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
entity motor_demo is
    port(    clk: in std_logic;
        
            RST, EN, CTRL, HALF, CW, Step_clk: out std_logic;
            sw: in std_logic_vector(0 to 4);
            sw_check: out std_logic_vector(0 to 4)
            );
end motor_demo;
architecture stm of motor_demo is
    type motor_action is (STOP, CWISE, CCWISE);
    signal motor_state: motor_action := CWISE;
    
    signal stepcount: integer := 0;
    signal clk_div: std_logic;
    signal drive: std_logic := '0';
    signal cw_45, ccw_180: std_logic := '0';
begin
    -- Clock divider for stepper action
    clk_divider: entity work.clk_divide port map(clk, clk_div);
    
    -- Motor control lines
    EN <= '1';
    RST <= '1';
    CTRL <= '1';
    HALF <= '1';
    
    -- switch debugging
    sw_check <= sw;
    
    -- driving the step clock
    with drive select
        step_clk <= clk_div when '1',
                        '0' when '0',
                        '0' when others;
                        
    process(clk_div, motor_state, sw) is
    begin
    
        if rising_edge(clk_div) then
        
            if sw(0) = '0' then
                motor_state <= CWISE;
            elsif sw(1) = '0' then
                motor_state <= CCWISE;
            elsif sw(2) = '0' then
                motor_state <= STOP;
            elsif sw(3) = '0' then
                motor_state <= CWISE;
                cw_45 <= '1';
            elsif sw(4) = '0' then
                motor_state <= CCWISE;
                ccw_180 <= '1';
            end if;    
            
            -- counter conditions
            if cw_45 = '1' AND stepcount < 49 then
                stepcount <= stepcount + 1;
            elsif ccw_180 = '1' AND stepcount < 199 then
                stepcount <= stepcount + 1;
            else
                ccw_180 <= '0';
                cw_45 <= '0';
                motor_state <= STOP;
            end if;    
        
            case motor_state is 
                when STOP =>
                    drive <= '0';
                    stepcount <= 0;    
                when CWISE =>
                    drive <= '1';
                    CW <= '1';        
                when CCWISE =>
                    drive <= '1';
                    CW <= '0';    
            end case;
        
        end if;
    
    end process;
    
end stm;