Pinout MCU

Alt Functions	External Conn Chassis	MCU Pinout	Pin	-	Pin	MCU Pinout	External Conn Chassis	Alt Functions
	1	3.3V	1		2	3.3V	2
		GND	3		4	GND
	13	GPIO_PB1	5		6	VBAT
	3	GPIO_PB7	7		8	GPIO_PB8	15
	4	GPIO_PB6	9		10	GPIO_PB9	16
		GPIO_PB5	11		12	GPIO_PC15	14
		GPIO_PB4	13		14	NRST
		GPIO_PB3	15		16	GPIO_PA0		WKUP
		GPIO_PA15	17		18	GPIO_PA1	5
SWDCLK		GPIO_PA14	19		20	GPIO_PA2	6
SWDIO		GPIO_PA13	21		22	GPIO_PA3	7
USB_DP		GPIO_PA12*	23		24	GPIO_PA4	8
USB_DN		GPIO_PA11*	25		26	GPIO_PA5	9
		GPIO_PA10	27		28	GPIO_PA6	10
		GPIO_PA9	29		30	GPIO_PA7	11
	12	GPIO_PA8	31		32	GPIO_PB0
		GPIO_PB15	33		34	GPIO_PB2
		GPIO_PB14	35		36	GPIO_PB10		I2C_SCL
		GPIO_PB13	37		38	GPIO_PB11		I2C_SDA
		GPIO_PB12	39		40	5V

Accessing the peripherals on the MCU on UP Xtreme

In order to access the peripherals, you need to reprogram the MCU with the desired functions using one of your favourite frameworks/language:

• Arduino for STM32
• STM32 Cube

PlatformIO Projects

Using PlatformIO (with ST STM32 extension), it is easy to setup a project and code with your preferred language and framework for UP Xtreme MCU.

We provide 2 generic samples to test the MCU I/O:

• Example to test the internal 40 pin header for the MCU and USB communication with the WHL-U SoC
• Example to test the external 16 pin header for the MCU and USB communication with the WHL-U SoC

In order to configure your project correctly, the platform.ini file included in the project should be as follows:

 ;PlatformIO Project Configuration File
 ;
 ;   Build options: build flags, source filter
 ;   Upload options: custom upload port, speed and extra flags
 ;   Library options: dependencies, extra library storages
 ;   Advanced options: extra scripting
 ;
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
  
 [env:bluepill_f103c8]
 platform = ststm32
 board = bluepill_f103c8
 framework = arduino
 upload_protocol = stlink
 lib_ldf_mode = deep+
 board_build.f_cpu = 48000000L
 build_flags =
     -D HSE_VALUE=8000000
     -D HAL_PCD_MODULE_ENABLED
     -D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
     -D USBCON
     -D USBD_USE_CDC
     -D USBD_VID=0X160D
     -D USBD_PID=0X9991
     -D USB_MANUFACTURE="Unknown"

Once your project is ready to be flashed, connect the USB STM32 Programmer to the Host PC where you have the PlatformIO IDE and use the available programming adapter cable to connect the STM32 Programmer to the MCU internal header. Then you can program the MCU by pressing the "upload" button on PlatformIO.

Once the upload process is complete the MCU will reset itself and start the uploaded sketch.