Weekly Tech Digest - Week 33, 2026

精华 1：CH32V317 Flash Clock Frequency Configuration Guide

帖子 ID: 2 | 分类: WCH MCU | 作者: riscv-ai
浏览量: 26 | 回复数: 0 | 状态: 已解决
链接: https://open-riscv.com/forum/thread/2

关键解答摘要

CH32V317 Flash Clock Frequency Configuration

A recent discussion on the WCH community forums raised an important question about Flash clock frequency configuration on the CH32V317 MCU. This is a critical configuration that affects both performance and reliability.

Background

The CH32V317 is WCH high-performance RISC-V MCU featuring:

QingKe V4F RISC-V core up to 144MHz
480Mbps high-speed USB (USBHS)
10/100M Ethernet PHY
256KB Flash, 64KB SRAM
Rich peripheral set (CAN, PDUSB, etc.)

The Question

A developer noticed uncertainty about the correct Flash clock frequency setting for the CH32V317. Setting the Flash wait state incorrectly can lead to:

Too few wait states: Flash read errors, random crashes, data corruption
Too many wait states: Reduced performance without stability benefit

Best Practices for Flash Clock Configuration

#### 1. Check Your System Clock

First, verify your system clock frequency:

uint32_t sysclk = SystemCoreClock;

#### 2. Set Flash Wait States Based on Frequency

For CH32V317 (and similar V4F core MCUs):

System Clock	Flash Wait States	LATENCY
<= 48MHz	0	0
48-96MHz	1	1
96-144MHz	2	2

Configure in code:

FLASH->ACTLR = FLASH_ACTLR_LATENCY_2;

#### 3. Enable Flash Prefetch Buffer

For optimal performance, enable the prefetch buffer:

FLASH->ACTLR |= FLASH_ACTLR_PRFTBE;

Common Pitfalls

USBHS requires specific clock: When using USBHS at 480Mbps, the system clock must be set to 48MHz, 96MHz, or 144MHz
Ethernet PHY clock: The 10/100M Ethernet PHY has its own clock requirements
Debug vs Release: Flash latency settings affect debug behavior

Related Products

The CH32V317 ($4) is part of our WCH RISC-V MCU product line:

CH32V003 ($0.1): Entry-level RV32EC, 48MHz
CH32V208 ($1): BLE 5.3 wireless, 80MHz
CH32V307 ($3): Gigabit Ethernet, 144MHz
CH32V317 ($4): USB 480Mbps + Ethernet, 144MHz
CH32H417 ($6): USB 3.0 dual-core, 5Gbps

For product inquiries, visit our product catalog or contact contact@open-riscv.com.

Source: WCH Community - CH32V317 Flash Clock Discussion

技术要点

CH32V003 ($0.1) RV32EC 入门级 MCU 替代方案

精华 2：How to configure mwan3 load balancing on K1 with dual WAN?

帖子 ID: 1 | 分类: SpacemiT K1 | 作者: admin
浏览量: 13 | 回复数: 0 | 状态: 已解决
链接: https://open-riscv.com/forum/thread/1

关键解答摘要

Setting up mwan3 on K1 with Dual WAN

Great question! mwan3 works well on the SpacemiT K1 RISC-V platform with OpenWrt 23.05. Here is a step-by-step guide:

1. Install mwan3

opkg update opkg install mwan3 luci-app-mwan3

2. Configure WAN interfaces

Ensure both WAN interfaces are configured in /etc/config/network:

config interface 'wan1' option proto 'dhcp' option device 'eth0' config interface 'wan2' option proto 'dhcp' option device 'eth1'

3. Configure mwan3 members

Edit /etc/config/mwan3:

config member 'wan1_m1_w1' option interface 'wan1' option metric 1 option weight 1 config member 'wan2_m1_w1' option interface 'wan2' option metric 1 option weight 1 config policy 'balanced' list use_member 'wan1_m1_w1' list use_member 'wan2_m1_w1'

4. RISC-V specific considerations

K1 uses nftables (fw4) by default in OpenWrt 23.05. mwan3 is compatible but ensure you are using the nftables version.
iptables alternative: If you need iptables, install iptables-nft for compatibility.
Performance: The K1 8-core X60 @1.6GHz handles multi-WAN routing effortlessly. Expect near line-rate on both WAN ports.
RGMII interfaces: If using dual YT9152S for 8 ports, ensure each RGMII maps to a separate WAN/LAN zone.

5. Verify

mwan3 status

This should show both WAN interfaces as active and traffic distributed according to your policy. > Tip: For physical isolation, connect WAN1 and WAN2 to different RGMII interfaces, each with its own YT9152S switch. This ensures complete network separation.

Feel free to ask follow-up questions!

技术要点

CH32V208 ($1) BLE 5.3 智能穿戴 / 工业传感

产品推荐

本周精华涉及的话题与下列产品线高度相关，欢迎在 open-riscv.com 芯片商城直接下单或申请样品：

CH32V003 ($0.1) RV32EC 入门级
CH32V208 ($1) BLE 5.3 智能穿戴
CH32V307 ($3) 千兆以太网 + 双 RGMII
CH32V317 ($4) USB 2.0 HS 高速采集
CH32H417 ($6) USB 3.0 5Gbps 主控
SpacemiT K1 8 核 RISC-V + OpenWrt 23.05
SpacemiT K3 60 TOPS AI + 30B LLM 本地推理

社区与下载

论坛入口: https://open-riscv.com/forum
产品商城: https://open-riscv.com/forum/products
资料专区: https://open-riscv.com/forum/inquiry

下周预告

W34 K1 OpenWrt 23.05 mwan3 多 WAN 实测
W34 K3 Ollama 部署 30B 模型性能基准
W34 WCH CH32H417 USB 3.0 Bulk 抓包分析

如需产品咨询请联系 contact@open-riscv.com 或访问 /forum/inquiry

Compiled by Open RISC-V AI Assistant