Interfacing with the E3V3SE TJC HMI display using TJC instructions ;)

main.cpp

#include <Arduino.h>
#define TJC Serial0
#define TX_Pin 6
#define RX_Pin 7
#define FRAME_LENGTH 7

int a;
unsigned long nowtime;
void setup()
{
  Serial.begin(115200);
  Serial.print("Settling");
  for (uint8_t i = 0; i < 10; i++)
  {
    Serial.print(".");
    delay(200);
  }
  Serial.println();

  TJC.begin(115200, SERIAL_8N1, -1, -1);
  TJC.print("DRAKJHSUYDGBNCJHGJKSHBDN\xff\xff\xff");

  while (TJC.read() >= 0)
    ;
  TJC.print("page main\xff\xff\xff");
  nowtime = millis();
}

void loop()
{
  char str[100];
  if (millis() >= nowtime + 500)
  {
    nowtime = millis();

    TJC.printf("n0.val=%d\xff\xff\xff", a);
    TJC.printf("t0.txt=\"count:%d\"\xff\xff\xff", a);
    TJC.printf("click b0,1\xff\xff\xff");
    delay(50);
    TJC.printf("click b0,0\xff\xff\xff");

    a++;
  }

  // Serial data format:
  // Serial data frame length: 7 bytes
  // Frame header parameter 1 parameter 2 parameter 3 frame end
  // 0x55 1 byte 1 byte 1 byte 0xffffff
  // When the parameter is 01
  // Frame header parameter 1 parameter 2 parameter 3 frame end
  // 0x55 01 led number led status 0xffffff
  // Example 1: Host computer code printh 55 01 01 00 ff ff ff Meaning: No. 1 led is turned off
  // Example 2: Host computer code printh 55 01 04 01 ff ff ff Meaning: No. 4 led is turned on
  // Example 3: Host computer code printh 55 01 00 01 ff ff ff Meaning: No. 0 led is turned on
  // Example 4: Host computer code printh 55 01 04 00 ff ff ff Meaning: LED No. 4 is off

  // When the parameter is 02 or 03
  // Frame header Parameter 1 Parameter 2 Parameter 3 Frame end
  // 0x55 02/03 Slide value 00 0xffffff
  // Example 1: Host computer code printh 55 02 64 00 ff ff ff Meaning: h0.val=100
  // Example 2: Host computer code printh 55 02 00 00 ff ff ff Meaning: h0.val=0
  // Example 3: Host computer code printh 55 03 64 00 ff ff ff Meaning: h1.val=100
  // Example 4: Host computer code printh 55 03 00 00 ff ff ff Meaning: h1.val=0

  // When the serial port buffer is greater than or equal to 6  while (TJC.available() >= FRAME_LENGTH)
  {
    unsigned char ubuffer[FRAME_LENGTH];
    // Read 1 byte from the serial port buffer without deleting it
    unsigned char frame_header = TJC.peek();
    // When the acquired data is a packet header (0x55)
    if (frame_header == 0x55)
    {
      // Read 7 bytes from the serial port buffer
      TJC.readBytes(ubuffer, FRAME_LENGTH);
      if (ubuffer[4] == 0xff && ubuffer[5] == 0xff && ubuffer[6] == 0xff)
      {
        if (ubuffer[1] == 0x01)
        {
          // What is sent is LED information
          sprintf(str, "msg.txt=\"led %d is %s\"\xff\xff\xff", ubuffer[2], ubuffer[3] ? "on" : "off");
          TJC.print(str);
        }
        else if (ubuffer[1] == 0x02)
        {
          // What is sent is the information of the slider h0.val
          sprintf(str, "msg.txt=\"h0.val is %d\"\xff\xff\xff", ubuffer[2]);
          TJC.print(str);
        }
        else if (ubuffer[1] == 0x03)
        {
          // What is sent is the information of the slider h1.val
          sprintf(str, "msg.txt=\"h1.val is %d\"\xff\xff\xff", ubuffer[2]);
          TJC.print(str);
        }
      }
    }
    else
    {
      TJC.read(); // Read 1 byte from the serial buffer and delete
    }
  }
}