This is a very simple and cheap STM32C071 board.
It is largely compatible to ATMega-based "Nano" boards - with 3.3V IOs:
- Simple, very low cost (2L, all parts on top of PCB)
- Builtin USB (DFU) bootloader
- Full-speed USB, no crystal needed (using the Clock Recovery System (CRS))
- 48MHz ARM® Cortex®-M0+ with 24KB SRAM and 128KB Flash memory
- 23+2 GPIOs with 2x SPIs, 2x UARTs, 2x I2C and lots of timer channels
- 9 analog input channels, internal voltage reference
- Fast 2.5MSps 12-bit Analog-to-digital converter (ADC)
- 2x user LEDs (not shared with other GPIOs)
see znu.nz/c0
If you build this yourself, you must set the NBOOT_SEL Bit in the Flash Option Bytes to zero (e.g. via SWD), or you cannot use BOOT0 to invoke the bootloader during powerup.
Designed by Benedikt Heinz <hunz at mailbox.org>
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