The CH32V307 board

It measures 2-7/8 by 4 inches -- a pretty big board. The board is marked "CH307V-R1-1v0". There was an earlier board marked "CH307V-R0-1v0". My board is black (the earlier one was green). The earlier board had what look like 4 USB on one edge and the ethernet connector all by itself on another edge.

If you want to buy one of these, I see them for sale on "Tindie" for $29.

• CH32V307 R1 board on Tindie

Here is what I see on my board:

• The CH32V307 chip in what looks like a 100 pin package.
• an 8Mhz crystal oscillator (Y1)
• a 32.768 crystal (Y2)
• P6 USBHS - USB (type C)
• P7 USBFS - USB (type C)
• CH549G chip to P9 (USB type C)
• A honest to goodness power LED
• An honest reset button
• A user or "key" button
• An actual switch on 5 volt power (via a 500 mA fuse)
• RJ-45 ethernet
• A wealth of GPIO pins.

• two rows of 54 pins (54 ?!) one on each side of the board
• duplicate female pins in single rows (arduino compatibility??)

The CH549G is described as "An 8-bit enhanced USB MCU with multiple interfaces. It provides 64K program ROM and 2K+256 RAM. It supports USB host, USB device and Type-C CC and PD. It provides 16-channel Touch-key, 16-channel ADC, 3 sets of timers, 8-channel PWM, 4-channel UART and SPI, etc." Sounds like a fancy item to use as a USB to serial interface, but it is made by the same folks who make the CH307, so it makes sense that they would use it.

First power on

2022-06-18T22:35:03.097842-07:00 trona kernel: usb 1-1.2: USB disconnect, device number 4
2022-06-18T22:35:03.880840-07:00 trona kernel: usb 1-1.2: new full-speed USB device number 5 using ehci-pci
2022-06-18T22:35:03.960832-07:00 trona kernel: usb 1-1.2: New USB device found, idVendor=1a86, idProduct=8010, bcdDevice= 2.03
2022-06-18T22:35:03.961134-07:00 trona kernel: usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2022-06-18T22:35:03.961372-07:00 trona kernel: usb 1-1.2: Product: WCH-Link
2022-06-18T22:35:03.961685-07:00 trona kernel: usb 1-1.2: Manufacturer: wch.cn
2022-06-18T22:35:03.962019-07:00 trona kernel: usb 1-1.2: SerialNumber: 0001A0000001
2022-06-18T22:35:03.962820-07:00 trona kernel: cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device