Quick start guide

• USB powered: 3.3V is generated by on-board LDO
  3.3V power availble to application
• External 3.3V source: applied to power pins
• Analog supply: selected by solder jumper
  external or connected to 3.3V Vcc

• Boot0 (1): Boot mode selection (0: normal, 1: bootloader)
  On board pull down
• Reset (4): tie low to reset the board
  Active low, on board pull down
• PA4 (10): On board LED
  LED is lit when GPIO is low.
  this allows to drive high load using external low side FET

• Install and execute STM32CubeMX | html
• Start a New Project and select STM32F042F6Px MCU.
• Set PA4 pin as GPIO_Output
• In 'Project Settings', set Project Name and select 'Toolchain / IDE' as Makefile
• Click on Generate Code

  /* USER CODE BEGIN WHILE */
  while (1)
  {
    HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_4); //Toggle the state of pin PA4
    HAL_Delay(100); //delay 100ms

  /* USER CODE END WHILE */

# Build blink
make

# Flash via USB DFU (connect Boot0 to Vcc)
dfu-util -l
dfu-util -d xxxx:yyyy -a z -D build/blink.bin