79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
#include <Wire.h>
|
|
#include <Adafruit_GFX.h>
|
|
#include <Adafruit_SSD1306.h>
|
|
|
|
// OLED setup
|
|
#define SCREEN_WIDTH 128
|
|
#define SCREEN_HEIGHT 64
|
|
#define OLED_ADDRESS 0x3C
|
|
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
|
|
|
|
// RS485 control pins
|
|
#define DE_PIN 20
|
|
#define RE_PIN 10
|
|
|
|
void setup() {
|
|
// Initialize Serial1 for RS485 (TX=21, RX=9)
|
|
Serial.begin(115200);
|
|
Serial1.begin(1000000, SERIAL_8N1, 9, 21);
|
|
|
|
// Set DE and RE as outputs
|
|
pinMode(DE_PIN, OUTPUT);
|
|
pinMode(RE_PIN, OUTPUT);
|
|
|
|
// Enable receive mode
|
|
digitalWrite(DE_PIN, LOW);
|
|
digitalWrite(RE_PIN, LOW);
|
|
|
|
// Initialize OLED
|
|
Wire.begin(3, 4); // SDA=3, SCL=4
|
|
if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
|
|
while (true)
|
|
; // Halt if display fails
|
|
}
|
|
display.clearDisplay();
|
|
display.setTextSize(1);
|
|
display.setTextColor(SSD1306_WHITE);
|
|
display.setCursor(0, 0);
|
|
display.println("Waiting for RS485...");
|
|
display.display();
|
|
}
|
|
|
|
void loop() {
|
|
if (Serial1.available()) {
|
|
uint8_t buffer[32];
|
|
int count = 0;
|
|
|
|
// Read all available bytes
|
|
while (Serial1.available() && count < sizeof(buffer)) {
|
|
buffer[count++] = Serial1.read();
|
|
}
|
|
|
|
// Display on Serial
|
|
Serial.print("recv: ");
|
|
for (int i = 0; i < count; i++) {
|
|
Serial.print("0x");
|
|
if (buffer[i] < 0x10) Serial.print("0");
|
|
Serial.print(buffer[i], HEX);
|
|
Serial.print(" ");
|
|
}
|
|
Serial.println();
|
|
|
|
// Display on OLED
|
|
display.clearDisplay();
|
|
display.setCursor(0, 0);
|
|
display.setTextSize(1);
|
|
display.println("Received:");
|
|
display.setCursor(0, 12);
|
|
display.setTextSize(1);
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
display.print("0x");
|
|
if (buffer[i] < 0x10) display.print("0");
|
|
display.print(buffer[i], HEX);
|
|
display.print(" ");
|
|
}
|
|
display.display();
|
|
}
|
|
}
|