Arduino for STM32

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Adafruit_SSD1306 Display (128, 64, &Wire2, OLED_RESET);

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// --------------------------------------
// i2c_scanner
//
// Version 1
//    This program (or code that looks like it)
//    can be found in many places.
//    For example on the Arduino.cc forum.
//    The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
//     Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26  2013
//    V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
//    by Arduino.cc user Krodal.
//    Changes by louarnold removed.
//    Scanning addresses changed from 0...127 to 1...119,
//    according to the i2c scanner by Nick Gammon
//    http://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
//    As version 4, but address scans now to 127.
//    A sensor seems to use address 120.
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//

#include <Wire_slave.h>

//use IIC2
//TwoWire WIRE2 (2,I2C_FAST_MODE);
//#define Wire WIRE2

//////////////////
 #define OLED_RESET -1 // use -1 if no reset pin on OLED board

// use second I2C bus on STM32F103
// TwoWire Wire2(SDA2, SCL2);
TwoWire Wire2(PB11, PB10);

Adafruit_SSD1306 Display
// below is for a 128x64 OLED. Other option is 128x32 for smaller OLED
Adafruit_SSD1306 Display (128, 64, &Wire2, OLED_RESET);
//////////////////
void setup() {

  Serial.begin(115200);
  Wire.begin();
  Serial.println("\nI2C Scanner");
}


void loop() {
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++) {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.

    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address < 16) 
        Serial.print("0");
      Serial.println(address, HEX);

      nDevices++;
    }
    else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16) 
        Serial.print("0");
      Serial.println(address, HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found");
  else
    Serial.println("done");

  delay(5000);           // wait 5 seconds for next scan
}
/*
////////////////////
   Display1.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // if nothing is displayed using 0x3C, try 0x3D
  
  //  Display1
  Display1.clearDisplay();
  Display1.setTextSize(2);
  Display1.setTextColor(WHITE, BLACK);
  Display1.setCursor(0, 0 );
  Display1.println("Display");
  Display1.println("I2C #2 @ 3C");
  Display1.display(); 
////////////////////
*/

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#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x3F for a 16 chars and 2 line display
//LiquidCrystal_I2C lcd(0x3F, 16, 2);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
lcd.begin();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(" I2C LCD with ");
lcd.setCursor(0,1);
lcd.print(" STM32F103C8T6 ");
}

void loop()
{
// Do nothing here…
}

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 // --------------------------------------
// i2c_scanner
//
// Version 1
//    This program (or code that looks like it)
//    can be found in many places.
//    For example on the Arduino.cc forum.
//    The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
//     Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26  2013
//    V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
//    by Arduino.cc user Krodal.
//    Changes by louarnold removed.
//    Scanning addresses changed from 0...127 to 1...119,
//    according to the i2c scanner by Nick Gammon
//    http://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
//    As version 4, but address scans now to 127.
//    A sensor seems to use address 120.
// Version 6, November 27, 2015.
//    Added waiting for the Leonardo serial communication.
// 
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//

#include <Wire.h>

// TwoWire Wire2(SDA2, SCL2);
TwoWire Wire2(PB11, PB10);


void setup()
{
  Wire2.begin();

  Serial.begin(9600);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}


void loop()
{
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ ) 
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire2.beginTransmission(address);
    error = Wire2.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4) 
    {
      Serial.print("Unknown error at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000);           // wait 5 seconds for next scan
}

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#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

//#if (SSD1306_LCDHEIGHT != 64)
#if (SSD1306_LCDHEIGHT != 32)
///#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

int sensorValue = 0;
int voltage = 0;
const int analogInPin = PA7;

//display.invertDisplay(true); // invert the colours of led display
//display.invertDisplay(false);
//display.drawPixel(10, 10, WHITE);//to highlight a particular pixel
void setup()
{
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize I2C addr to 0x3C ( for 128x64 Display )

  display.clearDisplay(); // clear the display before starting the program to avoid adafruit splashscreen ( *we can also skip it by modifing header file )
  // display.drawBitmap(x-axis position, y-axis position, bitmap data, bitmap width, bitmap height, color)
  display.drawPixel(100, 15, WHITE);//to highlight a particular pixel

}

void loop()
{
  display.clearDisplay();
  display.setTextSize(4);
  display.setTextColor(WHITE);

  sensorValue = analogRead(analogInPin);

  voltage = map(sensorValue, 0, 4096, 0, 3300);

  display.setCursor(0, 0);
  display.print(voltage);
  display.display();
}