📄 lcd_control_rtl_v3.vhd
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lcd_data <= function_set_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init6; 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 init6 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= entry_mode_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init7; 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 init7 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= entry_mode_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init8; 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 init8 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= display_control_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init9; 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 init9 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= display_control_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init10; 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 init10 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= clear_display_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init11; 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 init11 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= clear_display_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init12; 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 init12 => -- wait for 1.64 ms if(count = (t_pulse_c + t_clear_display_c)) then lcd_data <= set_ddram_address_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init13; 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 init13 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= set_ddram_address_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init14; 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 init14 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_1_c(7 downto 4); lcd_rw <= '0'; lcd_rs <= '1'; state_lcd <= init15; 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 init15 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_1_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init16; 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 init16 => -- wait for 40 祍 if(count = (t_pulse_c + t_next_pulse_c)) then lcd_data <= data_2_c(7 downto 4); lcd_rw <= '0'; state_lcd <= init17; 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 init17 => -- wait for 1 祍 if(count = (t_pulse_c + t_upper_lower_c)) then lcd_data <= data_2_c(3 downto 0); lcd_rw <= '0'; state_lcd <= init18; 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 init18 => -- wait for 1.64 ms if(count = (t_pulse_c + t_clear_display_c)) then lcd_data <= set_ddram_address_c2(7 downto 4); lcd_rs <= '0'; lcd_rw <= '0'; ⌨️ 快捷键说明
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