Arduino for STM32

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/*
 * Version 01 RS485 Laser RS-484 reading test program (with LCD added)
 * Bill Dube, Nov 24, 2024
 * Nucleo F446RE Ver 01
 * 
 */ 
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

HardwareSerial Serial1(USART1); //D10/(PB6) =TX1  PB7 = RX1

#define VER 01 
#define SERIAL_XMT 2 // DE control pin on RS 485 board
#define SERIAL_RCV 3 // RE control pin on RS 485 board

#define LCD_SCL PB8  // I2C clock pin
#define LCD_SDA PB9  // I2C data pin

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display  
  
  byte getdata;
  int ByteCount;
  long LaserDiaReadingI =0;
  float LaserDiaReadingF;
  String DigitString, ReadingString;
  unsigned long int TimeNow;
  float SecondsElapsed;
  
void setup() {

  lcd.init();                      // initialize the lcd 
  lcd.backlight();
 
  //Using Serial1 Port for RS485, 
  // Pin PB6 (D10) TX  Connected to pin DI on RS-485 board 
  // Pin PB7 RX  Connected to pin R0 on RS-485 board 
  // (This is the opposite to what is typically shown in tutorials, but this indeed is what works.)
  
  Serial1.begin(2400);  // Serial1 port = 2400 baud, 8 data, No parity, 1 stop
  // Serial.begin(115200); // Start serial monitor port when running this on a Mega
  // Pin D2 connected to pin DE on rs485 board
  // Pin D3 connected to pin RE on rs485 board
  pinMode(SERIAL_XMT, OUTPUT);//DE Controling pin of RS-485
  pinMode(SERIAL_RCV, OUTPUT);//RE Controling pin of RS-485
  // Set DE and RE to logic LOW
  digitalWrite(SERIAL_XMT,LOW);//DE=LOW Receive Enabled M1
  digitalWrite(SERIAL_RCV,LOW);//RE=LOW Receive Enabled M1
  delay(100); // Give a bit of time for board to get its serail pins sorted...
  lcd.setCursor(0,0);  
  lcd.print("RS485 Ver= ");
  lcd.println(VER);
  delay(1000); // Pause to leave the starting splash up on the monitor for a second...
  TimeNow = millis();
} // end setup()

void loop() {

  getdata=0;
  if(Serial1.available()){ //if there is a byte is available on the RS485
    getdata=Serial1.read();
    if (getdata == 0xF1) { // We have the beginning of a reading
      ByteCount=1; // Reset the byte counter
//      lcd.setCursor(0,0);  // Time stamp stuff for using with Mega and serial monitor
//      lcd.print("Time="); 
//      SecondsElapsed = (millis() - TimeNow) / 1000.0; // divide by a float to force the type conversion
//      lcd.print(SecondsElapsed,3);
      lcd.setCursor(0,0); // Row 1 col 1
      lcd.print("Laser Reading = ");
      lcd.setCursor(0,1); // Row 1 col 2
      lcd.print("                "); // clear it out with blanks
      lcd.setCursor(0,1); // Row 1 col 2
      lcd.print(LaserDiaReadingF, 3); // Write what we get back from the laser
      ReadingString =String(""); // Clear out for a new reading
    }
    else
    {
     DigitString =String("");  // Clear out the digit string
     if (getdata < 16){
       DigitString =String(0,HEX);
     }
     //Serial.print(getdata,HEX);
     DigitString +=String(getdata,HEX);
     if (ByteCount <=3 ) { // only save first 3 bytes
       ReadingString = DigitString + ReadingString; // Put the latest data in the _front_
       ByteCount++;  // increment the byte counter
     }
     if (ByteCount == 4) {
       LaserDiaReadingI = ReadingString.toInt();
       LaserDiaReadingF = LaserDiaReadingI / 1000.0;
       ByteCount++;
     }  
    } 
  } // if Serial1 avalible
} // end loop()

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HardwareSerial Serial1(PB7,PB6);

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void setup(){
...
Serial1.setRx(PB7)
Serial1.setTx(PB6)
...
}

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#ifdef HAL_UART_MODULE_ENABLED
WEAK const PinMap PinMap_UART_TX[] = {
  {PA_0,       UART4,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
  {PA_2,       USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
  {PA_9,       USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, [u]GPIO_AF7_USART1)},
  {PB_6,       USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
...
  {NC,         NP,     0}
};
#endif

#ifdef HAL_UART_MODULE_ENABLED
WEAK const PinMap PinMap_UART_RX[] = {
  {PA_1,       UART4,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
  {PA_3,       USART2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
  {PA_10,      USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
  {PB_7,       USART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
...
  {NC,         NP,     0}
};
#endif

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&usart1 {
	pinctrl-0 = <&usart1_tx_pb6 &usart1_rx_pb7>;
	pinctrl-names = "default";
	current-speed = <115200>;
	status = "okay";
};