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137 lines
4.8 KiB
137 lines
4.8 KiB
with Interfaces;
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use Interfaces;
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with Interfaces.C;
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use Interfaces.C;
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with Interfaces.C.extensions;
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use Interfaces.C.extensions;
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with bcm2835_h;
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use bcm2835_h;
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package body RaspiLcd is
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procedure io_init is
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begin
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bcm2835_gpio_fsel(pin => LCD_CS, mode => unsigned_char(BCM2835_GPIO_FSEL_OUTP));
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bcm2835_gpio_fsel(pin => LCD_RST, mode => unsigned_char(BCM2835_GPIO_FSEL_OUTP));
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bcm2835_gpio_fsel(pin => LCD_A0, mode => unsigned_char(BCM2835_GPIO_FSEL_OUTP));
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bcm2835_gpio_fsel(pin => LCD_CLK, mode => unsigned_char(BCM2835_GPIO_FSEL_OUTP));
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bcm2835_gpio_fsel(pin => LCD_SI, mode => unsigned_char(BCM2835_GPIO_FSEL_OUTP));
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end io_init;
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procedure lcd_init is
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begin
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-- reset
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bcm2835_gpio_write(pin => LCD_CS, on => unsigned_char(HIGH));
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bcm2835_delayMicroseconds(unsigned_long_long(1));
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bcm2835_gpio_write(pin => LCD_RST, on => unsigned_char(LOW));
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bcm2835_delayMicroseconds(unsigned_long_long(1));
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bcm2835_gpio_write(pin => LCD_RST, on => unsigned_char(HIGH));
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bcm2835_delayMicroseconds(unsigned_long_long(1));
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-- init routine
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for index in lcd_init_data'range loop
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lcd_transfer_data(value => lcd_init_data(index), si => false);
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end loop;
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lcd_clear;
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end lcd_init;
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-- display strings on the lcd at a given position
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-- data is a string with any allowed range
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-- for strings not beginning at 0 we have to decrement the index
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-- variable for xpos by the value of the range begin, so we get
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-- for xpos a range from (xpos + 0 .. xpos + number of char in string)
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procedure lcd_ascii57_string (xpos : natural; ypos : natural; data : string) is
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begin
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for index in data'range loop
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lcd_ascii57(xpos => xpos + (index - data'first) * 6, ypos => ypos, data => character'val(character'pos(data(index))));
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end loop;
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end lcd_ascii57_string;
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procedure lcd_ascii57 (xpos : natural; ypos : natural; data : character) is
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begin
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lcd_set_page(page => ypos, column => xpos);
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-- write one 5x7 char
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for index in 0..4 loop
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lcd_transfer_data(value => font_5x7(character'pos(data))(index), si => true);
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end loop;
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-- one free column between chars
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lcd_transfer_data(value => 16#00#, si => true);
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end lcd_ascii57;
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procedure lcd_picture (xpos : natural; ypos: natural) is
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begin
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for outdex in 0..7 loop
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lcd_set_page(page => ypos + outdex, column => xpos);
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for index in (128 * outdex) .. (128 * (outdex + 1) - 1) loop
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lcd_transfer_data(value => picture(index), si => true);
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end loop;
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end loop;
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end lcd_picture;
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procedure lcd_clear is
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begin
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bcm2835_gpio_write(pin => LCD_CS, on => unsigned_char(LOW));
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for outdex in 0..7 loop
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lcd_set_page(page => outdex, column => 0);
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for index in 0..128 loop
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lcd_transfer_data(value => 16#00#, si => true);
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end loop;
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end loop;
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bcm2835_gpio_write(pin => LCD_CS, on => unsigned_char(HIGH));
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end lcd_clear;
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procedure lcd_transfer_data (value : byte; si : boolean) is
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begin
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bcm2835_gpio_write(pin => LCD_CS, on => unsigned_char(LOW));
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bcm2835_gpio_write(pin => LCD_CLK, on => unsigned_char(HIGH));
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if si then
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bcm2835_gpio_write(pin => LCD_A0, on => unsigned_char(HIGH));
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else
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bcm2835_gpio_write(pin => LCD_A0, on => unsigned_char(LOW));
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end if;
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lcd_byte(value);
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bcm2835_gpio_write(pin => LCD_CS, on => unsigned_char(HIGH));
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end lcd_transfer_data;
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procedure lcd_set_page (page : natural; column : natural) is
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lsb : byte := byte(column + 1) and 16#0f#;
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msb : byte := byte(column + 1) and 16#f0#;
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page_int : byte := byte(page) or 16#b0#;
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begin
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msb := Shift_Right(msb, 4);
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msb := msb or 16#10#;
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lcd_transfer_data(value => page_int, si => false);
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lcd_transfer_data(value => msb, si => false);
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lcd_transfer_data(value => lsb, si => false);
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null;
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end lcd_set_page;
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procedure lcd_byte (data : byte) is
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data_int : byte := data;
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begin
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for index in 0..7 loop
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bcm2835_delayMicroseconds(unsigned_long_long(1));
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bcm2835_gpio_write(pin => LCD_CLK, on => unsigned_char(LOW));
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if (data_int and 16#80#) = 16#80# then
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bcm2835_gpio_write(pin => LCD_SI, on => unsigned_char(HIGH));
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else
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bcm2835_gpio_write(pin => LCD_SI, on => unsigned_char(LOW));
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end if;
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data_int := Shift_Left(data_int, 1);
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bcm2835_delayMicroseconds(unsigned_long_long(1));
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bcm2835_gpio_write(pin => LCD_CLK, on => unsigned_char(HIGH));
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end loop;
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end lcd_byte;
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end RaspiLcd;
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