WCH CH32V307 RISC-V development board features 8 UART ports controlled over Ethernet

CH32V307V-EVT-R1 is a development board based on WCH CH32V307 RISC-V microcontroller with an Ethernet port, an USB Type-C port, and eight UART interfaces accessible through headers.

As we noted in our article about CH583 Bluetooth 5.3 RISC-V microcontroller, WCH (Jiangsu Qin Heng) has started to share resources like datasheets and code samples through Github. They’ve done the same again for CH32V307 with schematics (PDF only), a datasheet in English, and firmware either bare metal or based on RT-Thread OS to control the eight serial interfaces over Ethernet.

CH32V307 RISC-V 8x UARTLet’s check CH32V305 and CH32V307 MCU specifications first:

  • MCU core – WCH designed RISC-V4F 32-bit RISC-V core up to 144MHz
  • FPU – Single-cycle multiplication and hardware division, hardware float point unit (FPU) ;
  • Memory – Up to 64KB SRAM
  • Storage – Up to 256KB Flash
  • Networking – Gigabit Ethernet MAC, 10 Mbps PHY
  • USB – 1x USB 2.0 OTG full-speed interface,  1x USB 2.0 host/device interface with built-in 480 Mbps PHY
  • Serial
    • 8x USART interfaces including 5x UARTs
    • 2x CAN interfaces (2.0B active)
    • 2-wire debug interface
  • Other interfaces/peripherals
    • SDIO interface
    • FSMC memory interface
    • DVP digital video interface
    • 80x GPIO ports, with 16 external interrupts;
    • 2x I2C, 3x SPI
    • 2x I1S
    • 2x 12-bit DAC;
    • 2-unit 16-channel 12-bit ADC, 16-channel TouchKey;
    • 10 timers;
    • 2x general DMA controllers, 18 channels in total;
    • 4x amplifiers;
  • Security – Single true random number generator (TRNG), CRC calculation unit, 96-bit unique chip ID;
  • Power management
    • Supply voltage – 2.5V/3.3V, GPIO unit is supplied independently;
    • Low-power modes: sleep/stop/standby;
    • Power-on/power-down reset (POR/PDR), programmable voltage detector (PVD);
  • Packages: LQFP64M, LQFP100.

CH305 and CH307 are pretty similar, except CH305 has less memory (32KB SRAM) and storage (128KB flash), and lacks interfaces like Ethernet and DVP.


CH32V307V-EVT-R1 board specifications:

  • MCU – WCH CH32V307VCT6 32-bit RISC-V microcontroller @ 144 MHz as described above
  • Networking – 10 Mbps Ethernet
  • USB – 1x USB 2.0 Type-C port (480 Mbps), 1x USB 2.0 Type-C port (Full Speed: 12 Mbps)
  • Expansion
    • MCU I/O expansion headers with 8x UART interfaces, and more
    • Arduino headers
  • Debugging
    • SDI & UART header to download and debug CH32V307 firmware
    • USB-C port to connect to WCH-Link (selectable by jumper)
  • Misc – LEDs, Reset button, user button,
  • Power Supply
    • Switch to select USB or external 5V power supply
    • 5V to 3.3V voltage regulator

CH32V307 RISC-V development board 8x UART

All resources can be found ch32v307 Github repo, with source and PDF schematics & PCB layout, datasheet, board’s user manual, code samples for each peripheral, and two samples to use the board as an Ethernet to multiple UARTs device as follows:

  • RT-Thread/uart_server_rtt – 8 UARTs server demo based on RT_Thread, LwIP.
  • bart_metal/8_uart_server – 8x UARTs server demo based on WCH_NET_lib without any OS (bare metal)

[Update April 27, 2023: The code samples have been moved to https://github.com/openwch/ch32v307/tree/main/EVT/EXAM/ETH/]

Patrick Yang, Technical director at WCH, says they’ve only implemented part of the code so far, and also welcome contributions from the community:

At present, we have realized the TX/RX function of TCP client, and TCP server and UDP server / client need to be realized and improved. I hope all developers can actively submit PR. waiting for you~

CH32V307V-EVT-R1 development board is listed on LCSC for about $10.7, but is currently out of stock.

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