lcd_control_rtl_v3.vhd
来自「LCD display driver for xilinx fpga」· VHDL 代码 · 共 1,428 行 · 第 1/3 页
VHD
1,428 行
state_lcd <= init19; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init19 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= set_ddram_address_c2(3 downto 0); lcd_rw <= '0'; state_lcd <= init20; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init20 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_3_c(7 downto 4); lcd_rw <= '0'; lcd_rs <= '1'; state_lcd <= init21; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init21 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_3_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init22; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init22 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_4_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init23; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init23 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_4_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init24; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init24 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_5_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init25; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init25 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_5_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init26; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init26 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_6_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init27; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init27 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_6_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init28; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init28 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_7_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init29; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init29 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_7_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init30; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init30 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_8_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init31; count <= 0; elsif (count = t_pulse_c) then lcd_rw <= '1'; count <= count + 1; elsif (count = (t_pulse_c - t_hold_c)) then lcd_e <= '0'; count <= count + 1; elsif (count = t_setup_c) then lcd_e <= '1'; count <= count + 1; else count <= count + 1; end if; when init31 => null; -- wait for 1 祍 when others => state_lcd <= lcdreset; end case; end if; end process; end rtl;⌨️ 快捷键说明
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