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Luis Rodil-Fernandez 2 years ago
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  1. 12
      README.md
  2. 39
      include/README
  3. 46
      lib/README
  4. 22
      platformio.ini
  5. 157
      src/main.cpp

12
README.md

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<<< a bunch of classic demoscene effects running on an esp32 >>>
___. .__ __ .__ .___ __
\_ |__ |__|_______/ |_| |__ __| _/____ ___.__._/ |________ ____
| __ \| \_ __ \ __\ | \ / __ |\__ \< | |\ __\_ __ \/ _ \
| \_\ \ || | \/| | | Y \/ /_/ | / __ \\___ | | | | | \( <_> )
|___ /__||__| |__| |___| /\____ |(____ / ____| |__| |__| \____/
\/ \/ \/ \/\/
+----- - - --- - - --- - -- - - - --- - - - --- --- -- - - - -- -- --+
: reliving some teenage coding on a lazy summer day .
. oldskool effects running on an ESP32 with a monochrome display :
: http://www.derfunke.net .
+-- (( 2022 )) ------ -- - -------------- -- --- ---------------- -- --+

39
include/README

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This directory is intended for project header files.
A header file is a file containing C declarations and macro definitions
to be shared between several project source files. You request the use of a
header file in your project source file (C, C++, etc) located in `src` folder
by including it, with the C preprocessing directive `#include'.
```src/main.c
#include "header.h"
int main (void)
{
...
}
```
Including a header file produces the same results as copying the header file
into each source file that needs it. Such copying would be time-consuming
and error-prone. With a header file, the related declarations appear
in only one place. If they need to be changed, they can be changed in one
place, and programs that include the header file will automatically use the
new version when next recompiled. The header file eliminates the labor of
finding and changing all the copies as well as the risk that a failure to
find one copy will result in inconsistencies within a program.
In C, the usual convention is to give header files names that end with `.h'.
It is most portable to use only letters, digits, dashes, and underscores in
header file names, and at most one dot.
Read more about using header files in official GCC documentation:
* Include Syntax
* Include Operation
* Once-Only Headers
* Computed Includes
https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

46
lib/README

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This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into executable file.
The source code of each library should be placed in a an own separate directory
("lib/your_library_name/[here are source files]").
For example, see a structure of the following two libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
and a contents of `src/main.c`:
```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
PlatformIO Library Dependency Finder will find automatically dependent
libraries scanning project source files.
More information about PlatformIO Library Dependency Finder
- https://docs.platformio.org/page/librarymanager/ldf.html

22
platformio.ini

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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:lolin32]
platform = espressif32
board = lolin32
framework = arduino
monitor_speed = 115200
; NeoGPS=slashdevin/NeoGPS@^4.2.9
lib_deps =
SSD1306=adafruit/Adafruit SSD1306@^2.5.6
Time=paulstoffregen/Time@^1.6.1

157
src/main.cpp

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#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define DEG2RAD 0.01745329f
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define STAR_COUNT 300
#define TEXT_COUNT 17
int textIdx = 0;
unsigned long lastText = 0;
const char *texts[] = {
"REMEMBER WHERE YOU ARE",
"THIS\nSPECK\nOF MATTER",
"YOU ARE\nSTARDUST",
"THAT WILL\nWALK HERE",
"ONLY\nONCE",
"GO FIND\nOTHERS",
"8000\nLIGHT\nYEARS",
"ISN'T\nFAR",
"WHEN YOU\nTRAVEL",
"IN YOUR\nMIND",
"",
"",
"",
"HAPPY\nBIRTHDAY",
"HAPPY\nBIRTHDAY",
"",
"",
};
struct Star {
int angle;
int age;
int speed;
};
Star sfield[STAR_COUNT];
void init_display() {
Wire.begin(5, 4);
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS, false, false)) {
Serial.println(F("SSD1306 allocation failed"));
while(true) ; // do not proceed
}
display.clearDisplay();
}
void star_reset(int which) {
sfield[which].angle = random(360);
sfield[which].speed = random(1, 6);
}
void init_starfield() {
for (int i = 0; i < STAR_COUNT; i++) {
sfield[i].age = random(0, 100);
star_reset( i );
}
}
void setup() {
Serial.begin(115200);
init_display();
init_starfield();
Serial.println("Kicking off starfield");
}
void draw_starfield() {
int xstar, ystar;
// compute center of screen
int xc = SCREEN_WIDTH >> 1;
int yc = SCREEN_HEIGHT >> 1;
display.clearDisplay();
for (int i = 0; i < STAR_COUNT; i++) {
if (sfield[i].age > 100) {
sfield[i].age = sfield[i].age - 100;
star_reset(i);
} else {
sfield[i].age = sfield[i].age + sfield[i].speed;
}
xstar = (xc + (sin(sfield[i].angle * DEG2RAD) * sfield[i].age ));
ystar = (yc + (cos(sfield[i].angle * DEG2RAD) * sfield[i].age ));
display.drawPixel(xstar, ystar, WHITE);
}
}
void draw_moire() {
float t = millis() * 0.001;
float cx1 = sin(t / 2) * SCREEN_WIDTH / 3 + SCREEN_WIDTH / 2;
float cy1 = sin(t / 4) * SCREEN_HEIGHT / 3 + SCREEN_HEIGHT / 2;
float cx2 = cos(t / 3) * SCREEN_WIDTH / 3 + SCREEN_WIDTH / 2;
float cy2 = cos(t) * SCREEN_HEIGHT / 3 + SCREEN_HEIGHT / 2;
for(int y = 0; y < SCREEN_HEIGHT; y++) {
float dy = (y - cy1) * (y - cy1);
float dy2 = (y - cy2) * (y - cy2);
for(int x = 0; x < SCREEN_WIDTH; x++) {
float dx = (x - cx1) * (x - cx1);
float dx2 = (x - cx2) * (x - cx2);
int ic = (int)ceil(sqrt(dx + dy));
int ic2 = (int)ceil(sqrt(dx2 + dy2));
int shade = ((( ic ^ ic2 ) >> 3) & 1) * 255;
if(shade > 128) {
display.drawPixel(x, y, WHITE);
} else {
display.drawPixel(x, y, BLACK);
}
}
}
}
void draw_text1() {
if( (millis() - lastText) >= 3200 ) {
textIdx++;
lastText = millis();
if(textIdx >= TEXT_COUNT) textIdx = 0;
}
display.setTextSize(2);
display.setTextColor(SSD1306_WHITE);
display.setCursor(10, 12);
display.println(F( texts[textIdx] ));
// display.setCursor(10, 32);
// display.setTextSize(2);
// display.println(F("WHERE YOU ARE"));
}
void loop() {
if( (textIdx > 9) && (textIdx <= 12) ) {
draw_moire();
} else {
draw_starfield();
}
draw_text1();
// draw_moire();
display.display();
}
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