Damian Peckett
parent
f380964ea3
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0b4deef806
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README.md
31
README.md
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# arduino-vga
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Generating VGA video with an Arduino Uno / Atmega16u2 Microcontroller
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Generating VGA video with an Arduino Uno / Atmega16u2 Microcontroller.
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**To Connect (atmega16u2):**
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Connect all grounds on the VGA connector together.
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Connect VGA ground to the Arduino Gnd.
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Place a 120ohm resistor from the MOSI2 pin (Pin 4 on ICSP) to PB7 (Pin 4 on JP2)
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*Optional Protection* Place a 1N4148 diode from PB7 (anode) to Gnd (cathode).
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Connect the VGA red, blue and green inputs together and connect to PB7.
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Connect VGA vsync to PB5 (Pin 3 on JP2).
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Connect VGA hsync to PB4 (Pin 1 on JP2).
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**To Assemble:**
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avr-as -mmcu=atmega16u2 -o ghettovga.o ghettovga.s
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avr-ld -m avr35 -o ghettovga.bin ghettovga.o
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avr-objcopy -j .text -j .data -O ihex ghettovga.bin vghettovga.hex
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**To Upload:**
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Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
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dfu-programmer atmega16u2 erase
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dfu-programmer atmega16u2 flash "./ghettovga.hex"
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dfu-programmer atmega16u2 reset
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**To Restore Arduino Bootloader**
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Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
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Retrieve the appropriate usb-serial hex from:
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https://github.com/arduino/Arduino/tree/master/hardware/arduino/avr/firmwares/atmegaxxu2/arduino-usbserial
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Use dfu-programmer to flash hex to atmega16u2
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Font glyphs copyright (c) 1981 Michael C. Koss http://mckoss.com/jscript/tinyalice.htm
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#!/bin/sh
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avr-as -mmcu=atmega16u2 -o vga.o sync.s
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avr-ld -m avr35 -o vga.bin vga.o
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avr-objcopy -j .text -j .data -O ihex vga.bin vga.hex
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@ -0,0 +1,5 @@
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#!/bin/sh
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dfu-programmer atmega16u2 erase
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dfu-programmer atmega16u2 flash "./vga.hex"
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dfu-programmer atmega16u2 reset
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,4 @@
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README
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This is a very old branch of the apple code that was used to generate ascii based characters.
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Needs a very serious clean up.
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#!/bin/sh
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avr-as -mmcu=atmega16u2 -o vga.o ghettovga.s
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avr-ld -m avr35 -o vga.bin vga.o
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avr-objcopy -j .text -j .data -O ihex vga.bin vga.hex
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@ -0,0 +1,5 @@
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#!/bin/sh
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dfu-programmer atmega16u2 erase
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dfu-programmer atmega16u2 flash "./vga.hex"
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dfu-programmer atmega16u2 reset
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File diff suppressed because it is too large
Load Diff
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/*
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* GhettoVGA Interface Library Example
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*/
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// Only supports upper case characters, ASCII 0x20 - 0x40
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void writeCharacter(unsigned char row, unsigned char col, unsigned char val) {
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unsigned char buf[4] = {0x8D, 0, 0, 0};
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buf[1] = col;
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buf[2] = row;
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buf[3] = val-0x20;
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Serial.write(buf, 4);
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}
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void writeString(unsigned char row, unsigned char col, const char *str) {
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const char *ptr;
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for(ptr = str; *ptr; ptr++, col++) writeCharacter(row, col, *ptr);
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}
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unsigned char readCharacter(unsigned char row, unsigned char col) {
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unsigned char buf[4] = {0x8A, 0, 0, 0};
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buf[1] = col;
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buf[2] = row;
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Serial.write(buf, 4);
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return Serial.read() + 0x20;
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}
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void clearRow(unsigned char row) {
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for(int col = 0; col < 32; ++col) writeCharacter(row, col, ' ');
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}
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void clearScreen() {
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unsigned char buf[4] = {0x8C, 0, 0, 0};
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Serial.write(buf, 4);
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}
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void setup() {
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Serial.begin(115200);
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}
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void loop() {
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writeString(0, 0, "HELLO WORLD!");
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delay(1000);
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clearScreen();
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delay(1000);
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}
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// Generate Encoded Font Glyph Table
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// Apple II Character Set.
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#include <stdio.h>
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#include <stdlib.h>
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unsigned char glyphs[64][5][3] = {
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// '@'
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{{0,1,0},
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{1,0,1},
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{1,1,1},
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{1,0,0},
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{0,1,1}},
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// 'A'
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{{0,1,0},
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{1,0,1},
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{1,1,1},
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{1,0,1},
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{1,0,1}},
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// 'B'
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{{1,1,0},
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{1,0,1},
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{1,1,0},
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{1,0,1},
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{1,1,0}},
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// 'C'
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{{0,1,0},
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{1,0,1},
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{1,0,0},
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{1,0,1},
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{0,1,0}},
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// 'D'
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{{1,1,0},
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{1,0,1},
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{1,0,1},
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{1,0,1},
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{1,1,0}},
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// 'E'
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{{1,1,1},
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{1,0,0},
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{1,1,0},
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{1,0,0},
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{1,1,1}},
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// 'F'
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{{1,1,1},
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{1,0,0},
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{1,1,0},
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{1,0,0},
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{1,0,0}},
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// 'G'
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{{0,1,1},
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{1,0,0},
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{1,0,1},
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{1,0,1},
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{0,1,0}},
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// 'H'
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{{1,0,1},
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{1,0,1},
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{1,1,1},
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{1,0,1},
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{1,0,1}},
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// 'I'
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{{1,1,1},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{1,1,1}},
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// 'J'
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{{1,1,1},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{1,1,0}},
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// 'K'
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{{1,0,1},
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{1,0,1},
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{1,1,0},
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{1,0,1},
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{1,0,1}},
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// 'L'
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{{1,0,0},
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{1,0,0},
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{1,0,0},
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{1,0,0},
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{1,1,1}},
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// 'M'
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{{1,0,1},
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{1,1,1},
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{1,0,1},
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{1,0,1},
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{1,0,1}},
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// 'N'
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{{1,0,1},
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{1,1,1},
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{1,1,1},
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{1,1,1},
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{1,0,1}},
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// 'O'
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{{0,1,0},
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{1,0,1},
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{1,0,1},
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{1,0,1},
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{0,1,0}},
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// 'P'
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{{1,1,0},
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{1,0,1},
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{1,1,0},
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{1,0,0},
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{1,0,0}},
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// 'Q'
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{{0,1,0},
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{1,0,1},
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{1,0,1},
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{0,1,0},
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{0,0,1}},
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// 'R'
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{{1,1,0},
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{1,0,1},
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{1,1,0},
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{1,0,1},
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{1,0,1}},
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// 'S'
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{{0,1,1},
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{1,0,0},
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{0,1,0},
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{0,0,1},
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{1,1,0}},
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// 'T'
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{{1,1,1},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{0,1,0}},
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// 'U'
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{{1,0,1},
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{1,0,1},
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{1,0,1},
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{1,0,1},
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{0,1,0}},
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// 'V'
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{{1,0,1},
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{1,0,1},
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{1,0,1},
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{0,1,0},
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{0,1,0}},
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// 'W'
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{{1,0,1},
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{1,0,1},
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{1,1,1},
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{1,1,1},
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{0,1,0}},
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// 'X'
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{{1,0,1},
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{1,0,1},
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{0,1,0},
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{1,0,1},
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{1,0,1}},
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// 'Y'
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{{1,0,1},
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{1,0,1},
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{0,1,0},
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{0,1,0},
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{0,1,0}},
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// 'Z'
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{{1,1,1},
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{0,0,1},
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{0,1,0},
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{1,0,0},
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{1,1,1}},
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// '['
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{{0,1,1},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{0,1,1}},
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// '\'
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{{1,0,0},
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{1,0,0},
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{0,1,0},
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{0,1,0},
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{0,0,1}},
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// ']'
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{{1,1,0},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{1,1,0}},
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// '^'
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{{0,1,0},
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{1,0,1},
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{0,0,0},
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{0,0,0},
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{0,0,0}},
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// '_'
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{{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,0,0},
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{1,1,1}},
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// ' '
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{{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,0,0}},
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// '!'
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{{0,1,0},
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{0,1,0},
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{0,1,0},
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{0,0,0},
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{0,1,0}},
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// '"'
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{{1,0,1},
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{1,0,1},
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{0,0,0},
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{0,0,0},
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{0,0,0}},
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// '#'
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{{1,0,1},
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{1,1,1},
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{1,0,1},
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{1,1,1},
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{1,0,1}},
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// '$'
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{{0,1,1},
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{1,1,0},
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{1,1,1},
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{0,1,1},
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{1,1,0}},
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// '%'
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{{1,0,1},
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{0,0,1},
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{0,1,0},
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{1,0,0},
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{1,0,1}},
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// '&'
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{{0,1,0},
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{1,0,1},
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{0,1,0},
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{1,0,1},
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{0,1,1}},
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// '\''
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{{0,1,0},
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{0,1,0},
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{0,0,0},
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{0,0,0},
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{0,0,0}},
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// '('
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{{0,0,1},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{0,0,1}},
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// ')'
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{{1,0,0},
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{0,1,0},
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{0,1,0},
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{0,1,0},
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{1,0,0}},
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// '*'
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{{0,0,0},
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{1,0,1},
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{0,1,0},
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{1,0,1},
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{0,0,0}},
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// '+'
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{{0,0,0},
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{0,1,0},
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{1,1,1},
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{0,1,0},
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{0,0,0}},
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// ''
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{{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,1,0},
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{1,0,0}},
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// '-'
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{{0,0,0},
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{0,0,0},
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{1,1,1},
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{0,0,0},
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{0,0,0}},
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// '.'
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{{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,0,0},
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{0,1,0}},
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// '/'
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{{0,0,1},
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{0,0,1},
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{0,1,0},
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{0,1,0},
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{1,0,0}},
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// '0'
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{{1,1,1},
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{1,0,1},
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{1,0,1},
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{1,0,1},
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{1,1,1}},
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// '1'
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{{0,1,0},
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{1,1,0},
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{0,1,0},
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{0,1,0},
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{1,1,1}},
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// '2'
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{{0,1,0},
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{1,0,1},
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{0,0,1},
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{1,1,0},
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{1,1,1}},
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// '3'
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{{1,1,0},
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{0,0,1},
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{0,1,0},
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{0,0,1},
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{1,1,0}},
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// '4'
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{{1,0,1},
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{1,0,1},
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{1,1,1},
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{0,0,1},
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{0,0,1}},
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// '5'
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{{1,1,1},
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{1,0,0},
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{1,1,1},
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{0,0,1},
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{1,1,0}},
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// '6'
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{{0,1,1},
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{1,0,0},
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{1,1,0},
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{1,0,1},
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{0,1,0}},
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// '7'
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{{1,1,1},
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{0,0,1},
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{0,1,0},
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{1,0,0},
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{1,0,0}},
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// '8'
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{{1,1,1},
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{1,0,1},
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{1,1,1},
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{1,0,1},
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{1,1,1}},
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// '9'
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{{0,1,0},
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{1,0,1},
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{0,1,1},
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{0,0,1},
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{1,1,0}},
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// ':'
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{{0,0,0},
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{0,1,0},
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{0,0,0},
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{0,1,0},
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{0,0,0}},
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// ';'
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{{0,0,0},
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{0,1,0},
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{0,0,0},
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{0,1,0},
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{1,0,0}},
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// '<'
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{{0,0,1},
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{0,1,0},
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{1,0,0},
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{0,1,0},
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{0,0,1}},
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// '='
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{{0,0,0},
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{1,1,1},
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{0,0,0},
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{1,1,1},
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{0,0,0}},
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// '>'
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{{1,0,0},
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{0,1,0},
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{0,0,1},
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{0,1,0},
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{1,0,0}},
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// '?'
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{{0,1,0},
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{1,0,1},
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{0,0,1},
|
||||
{0,1,0},
|
||||
{0,1,0}}
|
||||
};
|
||||
|
||||
int main() {
|
||||
int i;
|
||||
unsigned char character;
|
||||
|
||||
printf("\nROW_GLYPH_1:\n");
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][0][0]<<3) | (glyphs[i][0][1]<<2) | (glyphs[i][0][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][0][0]<<3) | (glyphs[i][0][1]<<2) | (glyphs[i][0][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][0][0]<<3) | (glyphs[i][0][1]<<2) | (glyphs[i][0][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = ((glyphs[i][0][0]<<3) | (glyphs[i][0][1]<<2) | (glyphs[i][0][2]<<1))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
|
||||
printf("\nROW_GLYPH_2:\n");
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][1][0]<<3) | (glyphs[i][1][1]<<2) | (glyphs[i][1][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][1][0]<<3) | (glyphs[i][1][1]<<2) | (glyphs[i][1][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][1][0]<<3) | (glyphs[i][1][1]<<2) | (glyphs[i][1][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = ((glyphs[i][1][0]<<3) | (glyphs[i][1][1]<<2) | (glyphs[i][1][2]<<1))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
|
||||
printf("\nROW_GLYPH_3:\n");
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][2][0]<<3) | (glyphs[i][2][1]<<2) | (glyphs[i][2][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][2][0]<<3) | (glyphs[i][2][1]<<2) | (glyphs[i][2][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][2][0]<<3) | (glyphs[i][2][1]<<2) | (glyphs[i][2][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = ((glyphs[i][2][0]<<3) | (glyphs[i][2][1]<<2) | (glyphs[i][2][2]<<1))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
|
||||
printf("\nROW_GLYPH_4:\n");
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][3][0]<<3) | (glyphs[i][3][1]<<2) | (glyphs[i][3][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][3][0]<<3) | (glyphs[i][3][1]<<2) | (glyphs[i][3][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][3][0]<<3) | (glyphs[i][3][1]<<2) | (glyphs[i][3][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = ((glyphs[i][3][0]<<3) | (glyphs[i][3][1]<<2) | (glyphs[i][3][2]<<1))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
|
||||
printf("\nROW_GLYPH_5:\n");
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][4][0]<<3) | (glyphs[i][4][1]<<2) | (glyphs[i][4][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][4][0]<<3) | (glyphs[i][4][1]<<2) | (glyphs[i][4][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = (~((glyphs[i][4][0]<<3) | (glyphs[i][4][1]<<2) | (glyphs[i][4][2]<<1)))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
for(i = 0; i < 64; ++i) {
|
||||
character = ((glyphs[i][4][0]<<3) | (glyphs[i][4][1]<<2) | (glyphs[i][4][2]<<1))&0xF;
|
||||
printf(".byte 0x%02x\n", character);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue