The STM32MP157A-DK1 and STM32MP157C-DK2 Discovery kits leverage the capabilities of STM32MP1 Series microprocessors to allow users easily develop applications using STM32 MPU OpenSTLinux Distribution software for the main processor and STM32CubeMP1 software for the co-processor.
They include an ST-LINK embedded debug tool, LEDs, push-buttons, one Ethernet 1-Gbps connector, one USB Type-CTM OTG connector, four USB Type-A Host connectors, one HDMI® transceiver, one stereo headset jack with analog microphone, and one microSDTM connector.
To expand the functionality of the STM32MP157A-DK1 and STM32MP157C-DK2 Discovery kits, two GPIO expansion connectors are also available for ARDUINO® and Raspberry Pi® shields.
Additionally, the STM32MP157C-DK2 Discovery kit features an LCD display with a touch panel, and Wi-Fi® and Bluetooth® Low Energy capability.
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We use a special library called adafruit_blinka (named after Blinka, the CircuitPython mascot) to provide the layer that translates the CircuitPython hardware API to whatever library the Linux board provides.
For example, on Raspberry Pi we use the python RPi.GPIO library. For any I2C interfacing we'll use ioctl messages to the /dev/i2c device. For SPI we'll use the spidev python library, etc. These details don't matter so much because they all happen underneath the adafruit_blinka layer.