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Rémi Heredero
213
Libs/Lcd/hdl/lcdCharacterEncoder_RTL.vhd
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213
Libs/Lcd/hdl/lcdCharacterEncoder_RTL.vhd
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library Common;
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use Common.CommonLib.all;
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ARCHITECTURE Encoder OF lcdCharacterEncoder IS
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constant lcdLineBitNb : positive := 6;
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constant lcdPageBitNb : positive := 4;
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constant lcdColumnBitNb : positive := 8;
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type fontDisplayStateType is (
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init, idle, readChar, displayColumns
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);
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signal fontDisplayState : fontDisplayStateType;
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signal asciiColumnCounter : unsigned(requiredBitNb(fontColumnNb)-1 downto 0);
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signal pixelOffset : unsigned(requiredBitNb(fontColumnNb*fontRowNb-1)-1 downto 0);
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signal pageCounter : unsigned(requiredBitNb(lcdPageNb)-1 downto 0);
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signal columnCounter : unsigned(requiredBitNb(lcdColumnNb)-1 downto 0);
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signal A0 : std_ulogic;
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signal pixelPage : std_ulogic_vector(fontRowNb-1 downto 0);
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signal pixelColumnHigh : std_ulogic_vector(fontRowNb-1 downto 0);
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signal pixelColumnLow : std_ulogic_vector(fontRowNb-1 downto 0);
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BEGIN
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------------------------------------------------------------------------------
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-- diplay FSM
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fontDisplaySequencer: process(reset, clock)
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begin
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if reset = '1' then
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fontDisplayState <= init;
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elsif rising_edge(clock) then
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case fontDisplayState is
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when init =>
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if lcdBusy = '0' then
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fontDisplayState <= idle;
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end if;
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when idle =>
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if asciiSend = '1' then
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fontDisplayState <= readChar;
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end if;
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when readChar =>
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fontDisplayState <= displayColumns;
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when displayColumns =>
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if (asciiColumnCounter = 0) and (lcdBusy = '0') then
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fontDisplayState <= idle;
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end if;
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end case;
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end if;
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end process fontDisplaySequencer;
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asciiBusy <= '0' when fontDisplayState = idle
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else '1';
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a0_proc: process(reset ,clock)
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begin
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if reset = '1' then
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A0 <= '0';
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elsif rising_edge(clock) then
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if asciiSend = '1' then
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if unsigned(asciiData) < 32 then
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A0 <= '0';
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else
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A0 <= '1';
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end if;
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end if;
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end if;
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end process a0_proc;
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------------------------------------------------------------------------------
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-- ascii column counter
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asciiCountColums: process(reset, clock)
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begin
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if reset = '1' then
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asciiColumnCounter <= (others => '0');
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elsif rising_edge(clock) then
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if asciiColumnCounter = 0 then
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if (fontDisplayState = idle) and (asciiSend = '1') then
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asciiColumnCounter <= asciiColumnCounter + 1;
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end if;
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else
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if (fontDisplayState = displayColumns) and (lcdBusy = '0') then
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if asciiColumnCounter < fontColumnNb then
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asciiColumnCounter <= asciiColumnCounter + 1;
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else
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asciiColumnCounter <= (others => '0');
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end if;
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end if;
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end if;
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end if;
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end process asciiCountColums;
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------------------------------------------------------------------------------
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-- page, column counter
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counter: process(reset, clock)
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begin
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if reset = '1' then
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pageCounter <= (others => '0');
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columnCounter <= (others => '0');
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clearDisplay <= '0';
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elsif rising_edge(clock) then
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clearDisplay <= '0';
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if asciiSend = '1' then
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case to_integer(unsigned(asciiData)) is
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when 2 => -- Start of text (home)
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pageCounter <= (others => '0');
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columnCounter <= (others => '0');
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when 3 => -- End of text (end)
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pageCounter <= to_unsigned(lcdPageNb - 1,pageCounter'length);
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columnCounter <= to_unsigned(lcdColumnNb - fontColumnNb, columnCounter'length);
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when 8 => -- BS (backspace) (column back)
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if (columnCounter - fontColumnNb) < 0 then
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columnCounter <= (others => '0');
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else
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columnCounter <= columnCounter - fontColumnNb;
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end if;
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when 10 => -- LF (linefeed) (next line)
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if pageCounter = (lcdPageNb-1) then
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pageCounter <= (others => '0');
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else
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pageCounter <= pageCounter + 1;
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end if;
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when 11 => -- Vertical Tab (prev line)
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if pageCounter = 0 then
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pageCounter <= to_unsigned(lcdPageNb - 1,pageCounter'length);
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else
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pageCounter <= pageCounter - 1;
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end if;
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when 13 => -- CR (carriage return) (coloumn back)
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columnCounter <= (others => '0');
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when 24 => -- CAN (cancel) (clear display)
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clearDisplay <= '1';
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when others =>
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if asciiData >= x"20" then -- normal ascii char
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columnCounter <= columnCounter + fontColumnNb;
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end if;
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end case;
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end if;
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end if;
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end process counter;
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lcdSend <= '1' when
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(fontDisplayState = displayColumns) and
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(lcdBusy = '0') and
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(asciiColumnCounter > 0)
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else '0';
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------------------------------------------------------------------------------
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-- Ram Data
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pixelOffset <= resize(
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resize(fontColumnNb-asciiColumnCounter, pixelOffset'length)*fontRowNb,
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pixelOffset'length
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) when asciiColumnCounter > 0
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else (others => '0');
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pixelPage <=
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pixelData(
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to_integer(pixelOffset) + fontRowNb-1 downto
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to_integer(pixelOffset) + lcdPageBitNb
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) &
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std_ulogic_vector(resize(pageCounter,lcdPageBitNb));
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pixelColumnHigh <=
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pixelData(
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to_integer(pixelOffset) + fontRowNb-1 downto
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to_integer(pixelOffset) + (lcdColumnBitNb/2)
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) &
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std_ulogic_vector(columnCounter(
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columnCounter'high downto (columnCounter'length/2)
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));
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pixelColumnLow <=
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pixelData(
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to_integer(pixelOffset) + fontRowNb-1 downto
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to_integer(pixelOffset) + (lcdColumnBitNb/2)
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) &
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std_ulogic_vector(columnCounter(
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(columnCounter'length/2)-1 downto columnCounter'low
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));
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buildLcdData: process(
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A0, pixelData, pixelOffset,
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pixelPage, pixelColumnHigh, pixelColumnLow
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)
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begin
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lcdData(lcdData'high) <= A0;
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if A0 = '1' then
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lcdData(lcdData'high-1 downto 0) <= pixelData(
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to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset)
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);
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elsif pixelOffset >= 40 then
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lcdData(lcdData'high-1 downto 0) <= pixelData(
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to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset)
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);
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elsif pixelOffset >= 32 then
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lcdData(lcdData'high-1 downto 0) <= pixelPage;
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elsif pixelOffset >= 24 then
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lcdData(lcdData'high-1 downto 0) <= pixelColumnHigh;
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elsif pixelOffset >= 16 then
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lcdData(lcdData'high-1 downto 0) <= pixelColumnLow;
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else
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lcdData(lcdData'high-1 downto 0) <= pixelData(
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to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset)
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);
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end if;
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end process buildLcdData;
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--lcdData <= A0 & pixelData(to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset)) when (A0 = '1')
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-- else A0 & pixelData(to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset)) when (pixelOffset >= 40)
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-- else A0 & pixelPage when (pixelOffset >= 32)
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-- else A0 & pixelColumnHigh when (pixelOffset >= 24)
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-- else A0 & pixelColumnLow when (pixelOffset >= 16)
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-- else A0 & pixelData(to_integer(pixelOffset)+fontRowNb-1 downto to_integer(pixelOffset));
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END ARCHITECTURE Encoder;
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