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Arduino

This page is dedicated to my works on the Arduino platform.

This program generate a PAL Video screen 160x256 pixel, full of text (20x32 char) and left some time to do something else!

This program use D0RX and D1TX pin on a arduino nano 3.0 (ATmega328), to see it you must connect 1 resistor to D0 (330ohm) and 1 resistor to D1 (1k ohm), this is the signal for you tv, take GND from arduino board.

To download a program you must disconnect the resistor that interfere to your FTDI chip.

Arduino IDE compile everything with -Os optimization for size not speed.

I have a Makefile to compile with option -O2 optimization for speed, that is customized for Arduino-0018 for Mac but adaptable for other platforms.

Go to the dir where is your pde file (in a dir that have the same name), and do a make.

After you can do a make upload, see in the Makefile (that is done for Arduino-0018 on Mac OS X) to do the changes for your sistem.

USART clk/4 mode is used to achieve a very fast pixel blasting!

         ychar=(line-STARTLINE)&7; //offset in char
         y=(line-STARTLINE)/8; //char per line
         // blast the data to the screen
         // We can load UDR twice because it is double-bufffered
         buffer=tileset[screen[0+y*32]*8+ychar];
         UDR0 = 0x00 ;
         UCSR0B = _BV(TXEN0);
         UDR0 = buffer ;
         for(x=1;x<20;x++)
         {
           buffer=tileset[screen[x+y*32]*8+ychar];
           while (!(UCSR0A & _BV(UDRE0))) ;
           UDR0 = buffer ;
         }
         

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