経緯

アリエクでe-Paperを買ったみました

背面を見てみるとRev.2.1でしたので、関連情報を見つけて、試してみました

＜関連譲歩＞ www.waveshare.com その一部を抜粋します。

Overview

Versions

V2: V2 hardware and interfaces are compatible with V1, adoptsV2 demo. If you are the first time to purchase it and there is a V2 label behind the screen, you can directly use the V2 demo.V1: use V1 demo.

Parameters

Dimensions	2.9inch
Driver board dimensions	89.5mm × 38mm
Display dimensions	66.89mm × 29.05mm
Outline dimensions (screen only)	79.0mm × 36.7mm × 1.05mm
Operating voltage	3.3V/5V (5V is required for power supply and signal)
Communication interface	SPI
Dot pitch	0.227 × 0.226
Resolution	296 × 128
Display color	Black, White
Grey scale	4
Refresh time	3s
Refresh power	26.4mW（typ.）
Standby current	< 0.01uA (almost 0)
Operating Temperature	0 ~ 50 ℃
Storage Temperature	-25 ~ 60 ℃ESP32/8266

Resources

Documentation

Schematic
2.9inch e-Paper V2 Specification (Newest)
2.9inch_e-Paper_Datasheet.pdf(V1)

Demo code

試してみました

Demo (zip file)よりダウンロードし、解凍する
E-Paper_code→Arduino→epd2in9_V2を開き、epd2in9_V2.inoをダブルクリック
ボードとポートを選択

e-PaperとRP2040を接続

e-Paper	配線色	ESP32	ESP32-S3	RP-2040
VCC	灰	3.3V	3.3V	3.3V
GND	茶	GND	GND	GND
DIN MOSI(Master Out Slave In)	青	IO14	IO11	10	マスターからスレーブへ
CLK SCK(Serial Clock)	黄	IO13	IO12	8	データ転送同期用のクロック信号
CS チップセレクト SS(Slave Select)	橙	IO15	IO10	D4	スレーブデバイスの選択
DC data:high　command:low	緑	IO27	IO13	D3
RST	白	IO26	IO14	D2
BUSY	紫	IO25	IO4	D5
PWR		IO33	IO5	D6	今回のパネルでは使用しない

ソースコード変更

　 endif.h

/**
 *  @filename   :   epdif.h
 *  @brief      :   Header file of epdif.cpp providing EPD interface functions
 *                  Users have to implement all the functions in epdif.cpp
 *  @author     :   Yehui from Waveshare
 *
 *  Copyright (C) Waveshare     August 10 2017
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documnetation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to  whom the Software is
 * furished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef EPDIF_H
#define EPDIF_H

#include <Arduino.h>

// Pin definition
// #define RST_PIN         8
// #define DC_PIN          9
// #define CS_PIN          10
// #define BUSY_PIN        7
// #define PWR_PIN         6

//Seeed XIAO RP2040
#define RST_PIN         D2
#define DC_PIN          D3
#define CS_PIN          D4
#define BUSY_PIN        D5
#define PWR_PIN         D6

class EpdIf {
public:
    EpdIf(void);
    ~EpdIf(void);

    static int  IfInit(void);
    static void DigitalWrite(int pin, int value); 
    static int  DigitalRead(int pin);
    static void DelayMs(unsigned int delaytime);
    static void SpiTransfer(unsigned char data);
};

#endif

epd2in9_V2.ino

  /**
 *  @filename   :   epd2in9_V2-demo.ino
 *  @brief      :   2.9inch e-paper V2 display demo
 *  @author     :   Yehui from Waveshare
 *
 *  Copyright (C) Waveshare     Nov 09 2020
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documnetation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to  whom the Software is
 * furished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <SPI.h>
#include "epd2in9_V2.h"
#include "epdpaint.h"
#include "imagedata.h"

#define COLORED     0
#define UNCOLORED   1

/**
  * Due to RAM not enough in Arduino UNO, a frame buffer is not allowed.
  * In this case, a smaller image buffer is allocated and you have to 
  * update a partial display several times.
  * 1 byte = 8 pixels, therefore you have to set 8*N pixels at a time.
  */
unsigned char image[1024];
Paint paint(image, 0, 0);    // width should be the multiple of 8 
Epd epd;
unsigned long time_start_ms;
unsigned long time_now_s;
char time_string[] = {'0', '0', ':', '0', '0', '\0'};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  int cnt = 8000;     // Serialが接続されるまで、最大約1秒待ちます。
  while (!Serial && cnt--) {
    delay(1);
  }
  Serial.printf("Serial cnt:%d\n\r", 8000 - cnt);

  if (epd.Init() != 0) {
      Serial.print("e-Paper init failed");
      return;
  }

  epd.ClearFrameMemory(0xFF);   // bit set = white, bit reset = black
  paint.SetRotate(ROTATE_90);
  paint.SetWidth(128);
  paint.SetHeight(296);

  /* For simplicity, the arguments are explicit numerical coordinates */
  paint.Clear(UNCOLORED);
  paint.DrawStringAt(0, 40, "YShigu`s Diary!", &Font20, COLORED);
  epd.SetFrameMemory(paint.GetImage(), 0, 10, paint.GetWidth(), paint.GetHeight());
  epd.DisplayFrame();

  delay(5000);



  /* Deep sleep */
  Serial.print("sleep...");
  epd.Sleep();
}

void loop() {

}

yshigu’s diary

296x128, 2.9inch E-Ink raw display panel V2を試してみました

経緯