text: #ifndef VARIANT_H
  #define VARIANT_H
  
  //On-board LED pin number           PIN  // Arduino Pin Number         
  #define BOARD_NR_LED            1
  #define LED_BUILTIN             PC13
  
  #define LED_BUILTIN_MASK        0xFF   //ON 1
  #define STM32_LED_BUILTIN_ACTIVE_HIGH
  
  #define BOARD_NR_KEY               0
  #define KEY0_BUILTIN             PA0
  #define KEY0_BUILTIN_MASK        0x01    //PRESED 1
  
  //On-board user button
  //#define USER_BTN                  PA0  // 2
  
  
  // Connected to on board LIS3DSH accelerometer, CS: PE3
  #define MOSI                        PA7
  #define MISO                        PA6
  #define SCK                         PA5
  #define SS                          PA4
  
  // Connected to on board CS43L22 audio
  #define SDA                         PB9
  #define SCL                         PB6
  
  #define I2C1_100KHZ_TIMING 0x2000090E
  #define I2C2_100KHZ_TIMING 0x2000090E
  #define I2C3_100KHZ_TIMING 0x2000090E
  #define I2C4_100KHZ_TIMING 0x2000090E
  
  //USB
  
  //serial bootloader address
  # define SERIAL_LOAD_RAM 0x20001800U
  
  
  #endif
  