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raspberrypisig / fiddle.html
Last active September 22, 2025 21:15 — forked from WarFox/fiddle.html
Test jsfiddle https://jsfiddle.net/gh/gist/library/pure/f1eb115b5da77cfbe5e9b7d510cb5efd
<!DOCTYPE html>
<html>
<head>
<title>Kitchen Sink Example</title>
</head>
<body lang="en">
<p>This paragraph WILL NOT be styled by CSS or changed by javascript.</p>
<p id="secondpara">This paragraph will be styled by CSS using its <b>id</b>attribute using CSS selector.</p>
<p class="thirdpara">This paragraph will be styled by CSS using its <b>class</b>attribute using CSS selector.</p>
<p id="willchange">This paragraph will be changed by javascript</p>
@raspberrypisig
raspberrypisig / index.css
Created September 22, 2025 19:21
Test jsfiddle http://jsfiddle.net/gh/gist/library/pure/{gist_id}/
p {
color: green
}
@raspberrypisig
raspberrypisig / Test.cpp
Created September 21, 2025 09:21
#include <Arduino.h>
#include <SPI.h>
// Pin definitions matching your diagram.json
#define BUSY_PIN 4 // esp:D4 -> epd1:BUSY
#define RESET_PIN 21 // esp:D21 -> epd1:RST
#define DC_PIN 22 // esp:D22 -> epd1:DC
#define CS_PIN 5 // esp:D5 -> epd1:CS
#define MOSI_PIN 23 // esp:D23 -> epd1:DIN
#define SCK_PIN 18 // esp:D18 -> epd1:CLK
@raspberrypisig
raspberrypisig / Bonnyr.md
Created September 21, 2025 09:09
@raspberrypisig
raspberrypisig / Claude2epaper.cpp
Created September 21, 2025 09:05
#include <Arduino.h>
#include <SPI.h>
#define BUSY_PIN 4
#define RESET_PIN 21
#define DC_PIN 22
// Display dimensions
#define EPD_WIDTH 128
#define EPD_HEIGHT 296
@raspberrypisig
raspberrypisig / claude-waveshare.cpp
Created September 21, 2025 08:32
#include <Arduino.h>
#include <SPI.h>
#define BUSY_PIN 4
#define RESET_PIN 21
#define DC_PIN 22
// Display dimensions
#define EPD_WIDTH 128
#define EPD_HEIGHT 296
@raspberrypisig
raspberrypisig / all.c
Last active September 21, 2025 04:34
unsigned char ucDataBlock[1983] = {
// Offset 0x00000000 to 0x000007BE
0x12, 0x01, 0x27, 0x01, 0x00, 0x11, 0x03, 0x44, 0x00, 0x0F, 0x45, 0x00,
0x00, 0x27, 0x01, 0x21, 0x00, 0x80, 0x4E, 0x00, 0x4F, 0x00, 0x00, 0x24,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@raspberrypisig
raspberrypisig / Hmm.md
Created September 20, 2025 20:50

Tiny hardware detail check first: you’re using the ESP32 with Arduino framework, and you want to send raw bytes over SPI. You have a DC pin (Data/Command pin) that determines whether the bytes should be understood as command or data by the peripheral. Conventionally, DC=0 → command and DC=1 → data. Correct?

Here’s a neat, reusable way to implement your two functions:

#include <SPI.h>

#define DC_PIN  21   // Change to your actual DC pin number
#define CS_PIN   5   // Chip select, change to your wiring
@raspberrypisig
raspberrypisig / Good.md
Created September 20, 2025 19:44

For the Waveshare 2.9" e-paper display v2, after initialization, you'll need to send several commands to turn on a pixel at position (0,0). Here's the sequence of raw bytes:

1. Set RAM X Address Start/End Position

0x44, 0x00, 0x0F  // Command 0x44, X start=0, X end=15 (128 pixels / 8 = 16 bytes)

2. Set RAM Y Address Start/End Position

0x45, 0x00, 0x00, 0x27, 0x01  // Command 0x45, Y start=0x0000, Y end=0x0127 (295 pixels)
@raspberrypisig
raspberrypisig / Raw.md
Last active September 20, 2025 19:39

https://files.waveshare.com/upload/7/79/2.9inch-e-paper-v2-specification.pdf

Sending raw SPI data to an e-paper display requires a precise sequence of commands and data bytes. Below is a detailed breakdown of the raw byte stream needed to draw a 5x5 black square at the (0,0) coordinate on a Waveshare 2.9-inch V2 e-paper display.

E-Paper Display Communication Principles

Communication with the display via SPI involves these key signals:

  • CS (Chip Select): Must be pulled low to start an SPI transaction.