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WCH-LinkRV Protocol

WCH-Link uses USB Bulk Transfer.

const VENDOR_ID: u16 = 0x1a86;
const PRODUCT_ID: u16 = 0x8010;

const ENDPOINT_OUT: u8 = 0x01;
const ENDPOINT_IN: u8 = 0x81;

// const RAW_ENDPOINT_OUT: u8 = 0x02;
// const RAW_ENDPOINT_IN: u8 = 0x82;

USB Packet

Request packet:

0	1	2	3 ... n
0x81	CMD	LEN	PAYLOAD ...

Success response packet:

0	1	2	3 ... n
0x82	CMD	LEN	PAYLOAD ...

Error response packet:

0	1	2	3 ... n
0x81	REASON	LEN	PAYLOAD ...

where:

LEN = PAYLOAD.len()
PAYLOAD

Command

0x01 - Set address and size
0x02 - Program
0x03 - Memory read
0x06 - Flash Read Protect
0x08 - DMI OP
0x0b - Reset
0x0d - Info
0x0e - Disable debug for riscvchip 2, 3
0x0f - ? beigin verify

0x01 - Set RAM address and size

0x02 - Program

0x01 Erase
0x03 execute ram?
0x05 begin buck transfer?
0x06 ?? - wlink_ready_write
0x07 Verify
0x08 End Program
0x09 buck transfer ends
0x0a ? Verify
0x0b for riscvchip 1, = verify
0x0c BeginReadMemory

0x03 - Memory Read

offset: u32
len: u32

0x06 - Flash Read Protect

0x01 Check if flash is read-protected
- 0x01 protected, read-memory return random data
- 0x02 not protected
0x03 Set flash read-protected
0x02 Set flash read-unprotected

Set subcommand requires quitreset for riscvchip 1

0x08 - DMI OP

PAYLOAD

iAddr_u8	iData_u32_be	iOp_u8

Response PAYLOAD

oAddr_u8	oData_u32_be	oOp_u8

where:

oOp_u8 = 0x02 when failed

0x0b - Reset

0x01 Quit reset
- 300ms delay after this command
0x02 Reset for riscvchip 0x02
0x03 Reset, normal?

0x0d - Control

0x01 Get firmware version
0x02 Connect chip
0x03 ? stage after connect chip and read riscvchip, for riscvchip 1
0x04 get rom ram split, for riscvchip 3, 5, 6, 9
0xff End process

0x0e

0x01 Disable debug for riscvchip 2, 3

Error Reason

0x55: failed to connect with riscvchip

Constants

RiscvChip

/// Currently supported RISC-V chip series
#[repr(u8)]
pub enum RiscvChip {
    /// CH32V103 RISC-V3A series
    CH32V103 = 0x01,
    /// CH571/CH573 RISC-V3A BLE 4.2 series
    CH57x = 0x02,
    /// CH565/CH569 RISC-V3A series
    CH56x = 0x03,
    /// CH32V20x RISC-V4B/V4C series
    CH32V20x = 0x05,
    /// CH32V30x RISC-V4C/V4F series
    CH32V30x = 0x06,
    /// CH581/CH582/CH583 RISC-V4A BLE 5.3 series
    CH58x = 0x07,
    /// CH32V003 RISC-V2A series
    CH32V003 = 0x09,
}

Firmware Versions

WCH-LinkUtility v2.8

MRS IDE v2.7

Variants

MCU	Variant	Description
CH549	WCH-Link-R1-1v1	Swith mode by changing firmware
CH32V305F	WCH-LinkE-R0-1v3	Swith mode by button or EEPROM setting
CH32V203	WCH-LinkS-CH32V203
??	WCH-LinkB

Ref

Official WCH-Link Homepage(English) http://www.wch-ic.com/products/WCH-Link.html
Official WCH-Link Homepage(中文) https://www.wch.cn/products/WCH-Link.html

WCH-OpenOCD

Since WCH updates there firmware to 2.8, the old version of WCH-OpenOCD might be not working.

3.5 KiB Raw Blame History