/*
**  Note:
**  This was my first Wokwi excursion. I do continue it since my experiment
**  with MicroPython failed. The trial was https://wokwi.com/projects/475845604237478913
*/

// Voyager in a Tin (working title)
// This is first of a kind in several aspects:
//    - it's my first IoT project
//    - it's my first attempt to use Wokwi
//    - it's the first clone of an ancient HP Voyager pocket calculator with WiFi
//    - it's the first ancient HP pocket calculator build into an Altoids tin
// The Voyager series includes also the since decades well known HP12C Financial Calculator

// The nudge:
// I was triggered to start this project by the ATS Mini Radio and its wireless features,
// see ... esp32-si4732.github.io/ats-mini/index.html
// The goal:
// Since long I'm interessted in "emulators" (which in fact are simulations) of HP pocket calculators.
// Besides those running under Windows, Linux, MacOS, ..., there exist also some clones, but up to now
// none using WiFi. With it I'd like to enable copy and paste, access to data and programs (R/W and R/O),
// exchange of the calculator's ROM (what means changing the model), maybe also version updates.

// This project includes help/suggestions/code from
//   - Koepel, working wiring of the display
//   - AnonEngineering, wiring of the TCA8418 chip
//   - Maverick, simulation of the TCA8418
//   - robinblood created with AI support an HP10C simulator
//      see https://wokwi.com/projects/476496384464737281

// New role model: youtu.be/xNvaoZqZ404
// Result: lid and box indication swapped in the wiring sketch.

// Note: The included CSV files contain the f/w of the original calculators. Almost at least,
//       -- the hp16p is patched to fix the CHS/stack-lift bug.

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include <Adafruit_TCA8418.h>

Adafruit_TCA8418 keypad;

#define TFT_DC D4 // D2
#define TFT_CS D1 // D1
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

void setup() {
  Wire.begin(D2, D3);
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }
  Serial.println("");
  Serial.println("Hello, XIAO ESP32-C6!");
  Serial.println("Welcome to Wokwi :-)");

  if (! keypad.begin(TCA8418_DEFAULT_ADDR, &Wire)) {
    Serial.println("keypad not found, check wiring & pullups!");
    while (1);
  }

  // configure the size of the keypad matrix.
  // all other pins will be inputs
  keypad.matrix(4, 10);

  // flush the internal buffer
  keypad.flush();

  tft.begin();
  tft.setRotation(1);
// test of possible layout, goal: show 4-level stack plus LastX register
  tft.setCursor(6, 1);
  tft.setTextSize(4);
  tft.setTextColor(ILI9341_DARKGREY);
  tft.println("-3,141592654");
  tft.setCursor(6, 46);
  tft.println(" 0,318309886");
  tft.setCursor(6, 91);
  tft.setTextColor(ILI9341_LIGHTGREY);
  tft.println(" 2,718281828");
  tft.setCursor(6, 143);
  tft.setTextColor(ILI9341_WHITE);
  tft.println(" 1,648721271");
  tft.setCursor(6, 209);
  tft.setTextColor(ILI9341_LIGHTGREY);
  tft.print("-0,518309886");

  tft.setCursor(1, 188);
  tft.setTextColor(ILI9341_GREEN);
  tft.setTextSize(1);
  tft.println("USER    f   g    BEGIN    GRAD    D.MY    C    PRGM");
}

void loop() {
    if (keypad.available() > 0)
  {
    //  datasheet page 15 - Table 1
    int k = keypad.getEvent();
    if (k & 0x80) Serial.print("PRESS\tR: ");
    else Serial.print("RELEASE\tR: ");
    k &= 0x7F;
    k--;
    Serial.print(k / 10);
    Serial.print("\tC: ");
    Serial.print(k % 10);
    Serial.println();
  }

}