A few days ago, I received the CH573 development board from WCH, so I'd like to try this chip.

and here is some overview of the chip：

• 32-bit RISC processor WCH RISC-V3A
• Supports the RV32 IMAC instruction set, single-cycle multiplication and hardware division
• Built-in 18K SRAM, 512K Flash ROM, ICP, ISP and IAP support for OTA wireless upgrades
• Integrated 2.4GHz RF transceivers and baseband and link control to improve optimized protocol stack and application layer APIs to support networking
• Supports 3.3V and 2.5V power supplies, built-in DC/DC conversion, and 0dBm transmits power with a current of 6mA
• Various low power modes: Idle, Halt, Sleep, Shutdown, built-in battery voltage low voltage monitoring, minimum sleep current 0.3uA
• Built-in USB controller and USB transceiver for USB 2.0 full-speed and low-speed hosts or devices
• Built-in real-time clock RTC supports timing and triggering modes 
• An 8-channel 12-bit ADC-to-digital converter is available to support 8-channel touch keys 
• Provides 4 sets of 26-bit timers, supports capture/sampling, supports 4 26-bit PWM outputs, and supports 6 8-bit PWM outputs 
• Available in 4 sets of stand-alone UART, compatible with 16C550, with a maximum communication port rate of up to 6Mbps 
• Available in 1 set of SPIs, built-in FIFO, support for Master and Slave modes 
• Built-in temperature sensor 
• Available in 20 GPIO, 4 of which support 5V signal input, all GPIO support interrupt and wake-up functions 
• Built-in AES-128 plus decryption unit, chip unique ID 
• Package: QFN28_4X4

I've ported the u8g2 library to this chip.