iButton

platformio.ini

@@ -90,6 +90,7 @@ lib_deps =
 	Bodmer/JPEGDecoder
 	https://github.com/bmorcelli/SmartRC-CC1101-Driver-Lib/
 	ducktape=https://github.com/bmorcelli/duktape/releases/download/2.7.0-lite/duktape-2.7.0.zip
+  paulstoffregen/OneWire@^2.3.8
 	;https://github.com/eadmaster/rtl_433_ESP
 	;jackjansen/esp32_idf5_https_server_compat
 	tobozo/ESP32-PSRamFS

src/core/menu_items/OthersMenu.cpp

@@ -9,6 +9,7 @@
 #include "modules/others/timer.h"
 #include "modules/others/clicker.h"
 #include "modules/others/bad_usb.h"
+#include "modules/others/ibutton.h"
 
 void OthersMenu::optionsMenu() {
     options = {
@@ -30,6 +31,7 @@ void OthersMenu::optionsMenu() {
     #if !defined(ARDUINO_M5STACK_ARDUINO_M5STACK_CORE) && !defined(ARDUINO_M5STACK_ARDUINO_M5STACK_CORE2)
         {"Interpreter", [=]()  { run_bjs_script(); }},
     #endif
+        {"iButton",        [=]() { setup_ibutton(); }},
         {"Timer",        [=]() { Timer(); }},
         {"Main Menu",    [=]() { backToMenu(); }},
     };

src/modules/others/ibutton.cpp

@@ -0,0 +1,105 @@
+// thanks geo-tp for the base of this
+#include "ibutton.h"
+#include "core/display.h"
+#include "core/mykeyboard.h"
+
+#define ONE_WIRE_BUS 0
+
+OneWire oneWire(ONE_WIRE_BUS);
+byte buffer[8];
+
+void setup_ibutton() {
+  tft.fillScreen(TFT_BLACK);
+  tft.setTextColor(TFT_WHITE);
+  tft.setTextSize(2);
+  displayTextLine("Waiting iButton...");
+  delay(100);
+
+  for(;;){
+      if (check(EscPress)){
+        returnToMenu=true;
+        break;
+      }
+      // iButton is plugged
+      if (oneWire.reset() != 0) {
+        // Main Button is pressed
+        if (check(SelPress)) {
+          write_ibutton();
+        } else {
+          read_ibutton();
+        }
+      }
+      delay(500);
+  }
+}
+
+void write_byte_rw1990(byte data) {
+  for (int data_bit = 0; data_bit < 8; data_bit++) {
+    delay(25);
+    oneWire.write_bit(~data);
+    data >>= 1;
+  }
+}
+
+void write_ibutton() {
+  tft.setCursor(52,102);
+  tft.print("Wait...");
+
+  oneWire.reset(); // Reset bus
+  oneWire.skip(); // Skip rom check
+  delay(20);
+
+  // Step 1 : Prepare for writing
+  oneWire.write(0xD1);  // Start write command
+  oneWire.reset(); // Reset bus
+
+  // Step 2 : Write the ID
+  oneWire.write(0xD5);  // Write ID command
+  for (byte i = 0; i < 8; i++) {
+    write_byte_rw1990(buffer[i]);  // Write each byte
+  }
+  oneWire.reset();  // Reset bus
+
+  // Step 3 : Finalise
+  oneWire.write(0xD1);  // End of write command
+  oneWire.reset();  // Reset bus
+
+  // Display end of copy
+  tft.fillScreen(TFT_BLACK);
+  tft.setCursor(90,50);
+  tft.setTextSize(2);
+  displayTextLine("COPIED");
+  tft.setCursor(40,80);
+  tft.print("Release button");
+
+  delay(3000);
+
+  tft.fillScreen(TFT_BLACK);
+  tft.setCursor(10,60);
+  displayTextLine("Waiting iButton...");
+}
+
+void read_ibutton() {
+  oneWire.write(0x33);  // Read ID command
+  oneWire.read_bytes(buffer, 8);  // Read ID
+
+  // Display iButton
+  tft.fillScreen(TFT_BLACK);
+  tft.setTextSize(2);
+  tft.setCursor(55,20);
+  tft.println("iButton ID: ");
+
+  // Dislay ID
+  tft.setTextSize(1.7);
+  tft.setCursor(12, 57);
+  for (byte i = 0; i < 8; i++) {
+    tft.print(buffer[i], HEX);
+    tft.print(" ");
+  }
+
+  // Display copy infos
+  tft.setCursor(55,85);
+  tft.setTextSize(1.5);
+  tft.println("Hold OK to copy");
+}
+

src/modules/others/ibutton.h

@@ -0,0 +1,5 @@
+#include <OneWire.h>
+
+void setup_ibutton();
+void write_ibutton();
+void read_ibutton();