Added Example files from Waveshare repo

src/WS_RS485.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <HardwareSerial.h>       // Reference the ESP32 built-in serial port library
+#include "WS_GPIO.h"
+#include "WS_Relay.h"
+
+#define Extension_CH1       1     // Expansion Channel 1
+#define Extension_CH2       2     // Expansion Channel 2
+#define Extension_CH3       3     // Expansion Channel 3
+#define Extension_CH4       4     // Expansion Channel 4
+#define Extension_CH5       5     // Expansion Channel 5
+#define Extension_CH6       6     // Expansion Channel 6
+#define Extension_CH7       7     // Expansion Channel 7
+#define Extension_CH8       8     // Expansion Channel 8
+#define Extension_ALL_ON    9     // Expansion ALL ON
+#define Extension_ALL_OFF   10    // Expansion ALL OFF
+
+
+
+void SetData(uint8_t* data, size_t length);   // Send data from the RS485
+void ReadData(uint8_t* buf, uint8_t length);  // Data is received over RS485
+
+void RS485_Analysis(uint8_t *buf);            // External relay control
+void RS485_Init();         // Example Initialize the system serial port and RS485
+void RS485_Loop();         // Read RS485 data, parse and control relays
+void RS485Task(void *parameter);