初始化提交

arduino-cli/libraries/M5Core2-master/examples/Unit/CardKB/CardKB.ino

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+/*
+*******************************************************************************
+* Copyright (c) 2021 by M5Stack
+*                  Equipped with M5Core2 sample source code
+*                          配套  M5Core2 示例源代码
+* Visit the website for more information: https://docs.m5stack.com/en/core/core2
+* 获取更多资料请访问: https://docs.m5stack.com/zh_CN/core/core2
+*
+* describe: CardKB.  键盘
+* date: 2021/8/11
+*******************************************************************************
+  Please connect to Port A,Read the characters entered by CardKB Unit and display them on the screen.
+  请连接端口A,读取CardKB Unit输入的字符并显示在屏幕上。
+*/
+
+#include <M5Core2.h>
+
+#define CARDKB_ADDR 0x5F  //Define the I2C address of CardKB.  定义CardKB的I2C地址
+
+void setup() {
+  M5.begin();             //Init M5Core2.  初始化 M5Core2
+  M5.lcd.setTextSize(2);  //Set the text size to 2.  设置文字大小为2
+  M5.Lcd.printf("IIC Address: 0x5F\n");
+  M5.Lcd.printf(">>");
+  Wire.begin();
+}
+
+void loop() {
+  Wire.requestFrom(
+      CARDKB_ADDR,
+      1);  //Request 1 byte from the slave device.  向从设备请求1字节
+  while (Wire.available())  //If received data is detected.  如果检测到收到数据
+  {
+    char c = Wire.read();  // Store the received data.  将接收到的数据存储
+    if (c != 0) {
+      M5.Lcd.printf("%c", c);
+      Serial.println(c, HEX);
+    }
+  }
+}