add module rs232 example

Author: Forairaaaaa

examples/Modules/RS232/RS232.ino

@@ -0,0 +1,42 @@
+/*
+*******************************************************************************
+* Copyright (c) 2023 by M5Stack
+*                  Equipped with M5Core sample source code
+*                          配套  M5Core 示例源代码
+* Visit for more information:
+*https://docs.m5stack.com/en/module/RS232F%Module%13.2 获取更多资料请访问:
+*https://docs.m5stack.com/zh_CN/module/RS232F%Module%13.2
+*
+* Describe: RS232.
+* Date: 2023/3/23
+*******************************************************************************
+*/
+
+#include <M5Stack.h>
+
+/* Define your pin here */
+/* And should be the same as you module setup */
+#define RX_PIN 16
+#define TX_PIN 17
+
+void setup() {
+    M5.begin();
+    M5.Power.begin();
+    M5.Lcd.setTextSize(1);
+    M5.Lcd.drawString("Module RS232 test", 75, 3, 4);
+    Serial2.begin(
+        115200, SERIAL_8N1, RX_PIN,
+        TX_PIN);  // Set the baud rate of serial port 2 to 115200,8 data bits,
+                  // no parity bits, and 1 stop bit, and set RX to 16 and TX
+                  // to 17.
+                  // 设置串口二的波特率为115200,8位数据位,没有校验位,1位停止位,并设置RX,TX引脚
+}
+
+void loop() {
+    Serial2.write("Hello\n");
+
+    if (Serial2.available()) {
+        M5.Lcd.print(char(Serial2.read()));
+    }
+    delay(100);
+}