P10_simple

// Written By Kouzerumatsukite; 25 JUNE 2023
#include <Arduino.h>
#include <SPI.h>

// Assign these ESP32 pins to P10 Board
#define DR  23 // -> DR   // Data-Receive
#define OE  21 // -> OE   // Output-Enable
#define CLK 18 // -> CLK  // Data-Clock
#define LAT  5 // -> LAT  // Data-Latch
#define RSA 32 // -> A    // Row Select A
#define RSB 33 // -> B    // Row Select B

// the way of how the data is arranged in the display is stupid
// but we're gonna follow it anyway, its arranged like this:
// row 0-3: 0 4 8 C // Each hex notation stores byte (8 pixels)
// row 4-7: 1 5 9 D // DR IN -> 0123456789ABCDEF -> DR OUT
// row 8-B: 2 6 A E // board -> MATRIX ROW DATA  -> next matrix
// row C-F: 3 7 B F // the four rows selected by RSA / RSB pins

uint8_t display_data[4][16];
int current_row=0;

void displayRow(){
  // turn off display
  digitalWrite(OE,LOW);
  // update row select
  int row = current_row++ & 3;
  digitalWrite(RSA,row>>0&1);
  digitalWrite(RSB,row>>1&1);
  // update row data
  SPI.writeBytes((uint8_t*)display_data[row], 16);
  digitalWrite(LAT,HIGH);
  digitalWrite(LAT,LOW);
  // turn on display
  digitalWrite(OE,HIGH);
  return;
}

const uint8_t bitmap_test_00[] = { 0xC0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x03,  };
const uint8_t bitmap_test_01[] = { 0x00, 0x00, 0x00, 0x00, 0x01, 0x44, 0xA4, 0x00, 0xA3, 0x0C, 0x34, 0x00, 0xA5, 0x54, 0xA4, 0x00, 0xA5, 0x54, 0xA0, 0x00, 0x63, 0x4C, 0x94, 0x81, 0x00, 0x00, 0x01, 0x83, 0x00, 0x00, 0x03, 0xC7, 0x4A, 0x6E, 0x83, 0xFF, 0x6A, 0x88, 0x86, 0xF7, 0x5A, 0x8C, 0x85, 0x6B, 0x4A, 0x88, 0x05, 0x6B, 0x4A, 0x6E, 0x87, 0xFF, 0x00, 0x00, 0x0F, 0x77, 0x00, 0x00, 0x03, 0xCE, 0x00, 0x00, 0x00, 0xF8,  };
const uint8_t bitmap_test_02[] = { 0xFE, 0x00, 0x7F, 0xC0, 0x82, 0x00, 0x40, 0x40, 0x82, 0x00, 0x40, 0x40, 0x82, 0x00, 0x40, 0x40, 0x82, 0x00, 0x40, 0x40, 0x82, 0x00, 0x40, 0x40, 0x82, 0x00, 0x40, 0x40, 0xE2, 0x00, 0x70, 0x40, 0xE2, 0x00, 0x70, 0x40, 0xE2, 0x00, 0x70, 0x40, 0xE2, 0x00, 0x70, 0x40, 0xE2, 0x00, 0x70, 0x40, 0xE2, 0x22, 0x70, 0x40, 0xE2, 0x22, 0x70, 0x40, 0xE2, 0x2A, 0x70, 0x40, 0xFE, 0x3E, 0x7F, 0xC0,  };
const uint8_t bitmap_test_03[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00,  };
// function to load bitmap into display, in correct order
void loadBitmap(const uint8_t* bitmap_data){
  for(int y=0; y<4; y++){
    for(int x=0; x<16; x++){
      int i = (x/4)+4*(y+4*(3-(x%4)));
      display_data[y][x] = ~bitmap_data[i];
    }
  }
}

void setup() {
  // initialize pin states
  pinMode(DR ,OUTPUT);
  pinMode(OE ,OUTPUT);
  pinMode(CLK,OUTPUT);
  pinMode(LAT,OUTPUT);
  pinMode(RSA,OUTPUT);
  pinMode(RSB,OUTPUT);
  // initialize SPI
  SPI.begin(CLK, -1, DR, -1);
  SPI.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE0));
}

void displayDelay(int millisec){
  int finish_time = millis() + millisec;
  while (finish_time - millis() > 0){
    displayRow();
    delay(1);
  }
}

void loop() {
  // load bitmaps and display
  loadBitmap(bitmap_test_00);
  displayDelay(2500);
  loadBitmap(bitmap_test_01);
  displayDelay(2500);
  loadBitmap(bitmap_test_02);
  displayDelay(2500);
  loadBitmap(bitmap_test_03);
  displayDelay(2500);
}