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Honored ContributorError (10327): undefined operator ""=""
Hello guys,
it's been a really long time for me without coding in VHDL. I need a stepper motor controller for my nios2 based project so i thought it's best to implement it in FPGA which led me to write the code bellow: library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity stepper_motor_controller is port ( reset_n, clk, f_hn: in std_logic; mc: in std_logic_vector (1 downto 0); steps: out std_logic_vector (3 downto 0)); end entity; architecture behav of stepper_motor_controller is signal halffull :std_logic_vector (3 downto 0); begin process (reset_n,mc(1),f_hn) begin if (reset_n = '0') then halffull <= (others=>'0'); elsif (mc(1) = '0') then halffull <= (others=>'0'); elsif (f_hn = '0') then halffull <= "0001"; else halffull <= "0011"; end if; end process; process (clk) begin if (rising_edge(clk)) then if (mc(0)= '1') then halffull <= halffull(0) & halffull(3 downto 1); --rotate right else halffull <= halffull(2 downto 0) & halffull(3); --rotate left end if; else halffull <= halffull; end if; end process; steps <= halffull; end architecture; unexpectingly, i ended up having the following error msg: error (10327): vhdl error at stepper_motor_controller.vhd(16): can't determine definition of operator ""="" -- found 0 possible definitions i'll really appretiate it if someone could point out the reason for this error or suggest a modification to get over it Thx in advance, good day ;)
