server_plain.c

#include <RF22ReliableDatagram.h>
#include <Adafruit_GFX.h>
#include "Adafruit_ILI9340.h" // Hardware-specific library
#include <RF22.h>
#include <SPI.h>
#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2

RF22ReliableDatagram rf22(SERVER_ADDRESS);

#if defined(__SAM3X8E__)
#undef __FlashStringHelper::F(string_literal)
#define F(string_literal) string_literal
#endif

#define TFT_RST 7
#define TFT_DC 8
#define TFT_CS 9

Adafruit_ILI9340 tft = Adafruit_ILI9340(TFT_CS, TFT_DC, TFT_RST);
uint8_t row = 0;

void setup() {
  Serial.begin(9600);

  tft.begin();
  tft.fillScreen(ILI9340_BLACK);

  if (!rf22.init()) {
    Serial.println("RF22 init failed");
  }
}

// uint8_t data[] = "And hello back to you";
uint8_t buf[RF22_MAX_MESSAGE_LEN];

void loop() {
  uint8_t  r, g, b;
  uint8_t len = sizeof(buf);
  uint8_t from;

  if (rf22.recvfromAck(buf, &len, &from)) {
    digitalWrite(10, LOW);

    Serial.print("got request from : 0x");
    // Serial.print(from, HEX);
    // Serial.print(": ");
    // Serial.println((char*)buf);

    // len == 48?
    for (int jj = 0; jj < len; jj=jj+3) {
      Serial.println(jj);
      Serial.println("COL");

      r = buf[jj];
      g = buf[jj + 1];
      b = buf[jj + 2];

      Serial.print("R ");
      Serial.print(r);
      Serial.print(" G ");
      Serial.print(g);
      Serial.print(" B ");
      Serial.println(b);

      tft.drawPixel(jj / 3, row, tft.Color565(r, g, b));
    }

    row++;

    // if (!rf22.sendtoWait(data, sizeof(data), from)) {
    //   Serial.println("sendtoWait failed");
    // }
  }
}