Trying to use a custom serial connection to a salvaged board

Using Arduino Project Guidance
1

I salvaged a board from a satellite receiver that has a 4 digit 7 segment display, a couple of buttons, and a FD620K1 controlling it all.
The board has 6 pins:

  • 1 VDD
  • 1 GND
  • 1 pin for the IR receiver (Don't need it)
  • 1 STD
  • 1 CLCK
  • 1 Data I/O

After some googling I found the schematic for this part that controls the board. And the schematic for the board itself. (I found a Chinese one that I translated, I cannot upload as a new user, but I will add the link to it in Chinese: The Chinese pdf).

My question is: Is it feasible to code a custom way for the Arduino to control the digit display, and read the input?

Here's some code I tried to write that did not work:
Pin configuration:

  • VDD -> 3.3V
  • GND -> GND
  • IR -> (Unused)
  • STB -> 4
  • DIO -> 5
  • CLCK -> 6

Code:

void setup() {
  Serial.begin(9600);
  Serial.println("serial delimit test 1.0"); // so I can keep track of what is loaded
  pinMode(4, OUTPUT); // STB
  digitalWrite(4, HIGH);    
  pinMode(5, OUTPUT); // DIO
  digitalWrite(5, LOW);
  pinMode(6, OUTPUT); // Clock    
  Serial.println("Setting it to high in 1 second");
  delay(1000);
  Serial.println("High");
  // digitalWrite(4, HIGH);
}
int i = 0;
int bytemessage[] = {1,1,0,0,0,1,0,1};
int sleep = 10;
void loop() {
  i++;
  if (i == 500) 
  {
    digitalWrite(4, LOW);
    Serial.println("Sending"); 
    for(int b = 0; b < sizeof(bytemessage); b++) 
    {
      digitalWrite(6, HIGH);
      if(b == 1) 
      {
        digitalWrite(5, HIGH);  
      }
      delay(sleep);
      digitalWrite(6, LOW);
      digitalWrite(5, LOW);  
      delay(sleep);  
    }
    digitalWrite(4, HIGH);
  }
  digitalWrite(6, HIGH);
  delay(sleep);
  digitalWrite(6, LOW);
  delay(sleep);
  Serial.println(digitalRead(5));
}

Thanks!

2

You need to, at least, toggle the clock signal for each bit you are sending.

3

That's why I toggle the pin 6 inside the for loop, which is sending the byte.

4

Fixed if(b -- 1) to if(bytemessage[b] == 1)

5

Are doing one clock pulse as each bit is being sent? How do you coordinate the rising of the clock pulse with the bit being sent?

6

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