描述

在本教程中，我將向您展示如何使用 GxEPD2 庫(kù)對(duì)電子紙顯示器進(jìn)行部分更新。

由于電子墨水屏幕的刷新率非常慢（例如微雪 2s 的 2.9 英寸屏幕完全刷新），部分刷新功能非常有用。我使用的屏幕有 0.3 秒的局部刷新時(shí)間。

首先，電子墨水屏需要連接到 ESP32。ESP32 板之間的接線可能不同。以下是 GxEPD2 庫(kù)的示例草圖中的幾個(gè)示例：

// mapping suggestion for ESP32, e.g. LOLIN32, see .../variants/.../pins_arduino.h for your board
// NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD/
/ BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V// mapping of Waveshare ESP32 Driver Board
// BUSY -> 25, RST -> 26, DC -> 27, CS-> 15, CLK -> 13, DIN -> 14
// NOTE: this board uses "unusual" SPI pins and requires re-mapping of HW SPI to these pins in SPIClass
//       see example GxEPD2_WS_ESP32_Driver.ino, it shows how this can be done easily
// mapping suggestion for ESP32, e.g. LOLIN32 D32 PRO
// BUSY -> 15, RST -> 2, DC -> 0, CS -> 5, CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
// note: use explicit value for CS, as SS is re-defined to TF_CS(4) in pins_arduino.h for Board: "LOLIN D32 PRO"// mapping suggestion for ESP32, e.g. TTGO T8 ESP32-WROVER
// BUSY -> 4, RST -> 0, DC -> 2, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
// for use with Board: "ESP32 Dev Module":

我有一個(gè) NodeMCU ESP32，所以我按如下方式連接它（顯示 --> ESP32）：BUSY --> D4、RST --> RX2、DC --> TX2、CS --> D5、CLK --> D18、DIN --> D23，接地 --> 接地，VCC --> 3V3

代碼

首先，您需要安裝庫(kù) GxEPD2 和 U8g2_for_Adafruit_GFX（Sketch --> Include Library --> Manage Libraries --> search the name of the library --> click install）。