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163 lines
4.7 KiB
163 lines
4.7 KiB
-- raspilcd, a simple tool to display bmp pictures & text on a ST7565 LCD
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-- Copyright (C) 2014 Torsten Meissner
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see http://www.gnu.org/licenses/.
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with Ada.Text_IO;
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with bcm2835_h;
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with st7565lcd;
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with Interfaces; use Interfaces;
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with Ada.Text_IO, Ada.Integer_Text_IO, Ada.Streams.Stream_IO;
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use Ada.Text_IO, Ada.Integer_Text_IO, Ada.Streams.Stream_IO;
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with Ada.Command_Line; use Ada.Command_Line;
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procedure raspilcd is
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-- shorter names for packages
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package IO renames Ada.Text_IO;
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package LCD renames st7565lcd;
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package IOS renames Ada.Streams.Stream_IO;
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-- stream.io definitions
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My_File : IOS.FILE_TYPE;
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My_File_Access : IOS.STREAM_ACCESS;
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-- picture data
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picture_header : LCD.t_bmp_header;
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color_mask : LCD.t_color_mask;
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picture_data : LCD.t_bmp_array (0 .. 128 * 64 - 1);
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-- lcd pixel array
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lcd_data : LCD.t_lcd_array;
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-- exception handling
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tool_info : string := "raspi-lcd version 0.1, (c) 2014 by tmeissner";
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usage : string := "usage: ./raspitest BMP-FILE (as root)";
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bmp_error : string := "error: malformed BMP-FILE (valid: 128x64, no compression, 32bpp)";
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cli_exception : exception;
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bmp_exception : exception;
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begin
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-- no picture given
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if Argument_Count /= 1 then
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raise cli_exception;
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end if;
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-- open picture file
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declare
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filename : string := Argument (1);
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begin
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IOS.Open(My_File, In_File, filename);
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My_File_Access := IOS.Stream(My_File);
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end;
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-- read bmp header
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LCD.t_bmp_header'Read(My_File_Access, picture_header);
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--Put_Line("Width: " & Integer'Image(picture_header.biWidth));
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--Put_Line("Height: " & Integer'Image(picture_header.biHeight));
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--Put_Line("Color Depth: " & Integer'Image(Integer(picture_header.biBitCount)));
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--Put_Line("Compression: " & Integer'Image(Integer(picture_header.biCompression)));
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-- check for valid bmp format
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if (abs picture_header.biHeight /= 64 or picture_header.biWidth /= 128 or
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(picture_header.biCompression /= 0 and picture_header.biCompression /= 3) or
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picture_header.biBitCount /= 32) then
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raise bmp_exception;
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end if;
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-- get color map if existing
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if picture_header.biCompression = 3 then
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LCD.t_color_mask'Read(My_File_Access, color_mask);
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end if;
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-- read in image data
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if picture_header.biHeight < 0 then
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-- top-down pixel matrix
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for index in picture_data'range loop
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if not IOS.End_Of_File(My_File) then
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LCD.t_byte_array'Read(My_File_Access, picture_data(index));
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end if;
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end loop;
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else
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-- bottom-top pixel matrix
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for row in reverse 0 .. 63 loop
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for column in 0 .. 127 loop
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if not IOS.End_Of_File(My_File) then
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LCD.t_byte_array'Read(My_File_Access, picture_data(row * 128 + column));
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end if;
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end loop;
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end loop;
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end if;
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-- close picture file
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Ada.Streams.Stream_IO.Close(My_File);
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-- convert bmp to lcd matrix
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lcd_data := LCD.bmp_to_lcd(bmp => picture_data, color_mask => color_mask);
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-- load bcm2835 lib
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-- print picture and some text on lcd
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if integer(bcm2835_h.bcm2835_init) = 0 then
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IO.Put_Line("Error while initializing BCM2835 library");
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else
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LCD.io_init;
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LCD.lcd_init;
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LCD.lcd_picture(xpos => 0, ypos => 0, picture => lcd_data);
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bcm2835_h.bcm2835_delay(5000);
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LCD.lcd_clear;
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LCD.lcd_ascii57_string(xpos => 0, ypos => 0, data => "raspiFPGA 0.1");
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LCD.lcd_ascii57_string(xpos => 0, ypos => 1, data => "(c) raspiDEV 2013");
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-- close library
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if integer(bcm2835_h.bcm2835_close) = 0 then
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IO.Put_Line("Error while closing BCM2835 library");
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end if;
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end if;
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-- exception handling
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exception
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when e: cli_exception =>
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put_line(tool_info);
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put_line(usage);
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when e: bmp_exception =>
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put_line(tool_info);
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put_line(bmp_error);
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end raspilcd;
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