【经验】沁恒TCP/IP网络协议栈芯片CH395常见问题汇总及解答

时间： 2022-05-18 来源：沁恒

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用户在使用沁恒推出的TCP/IP网络协议栈芯片 CH395时，常会遇到以下问题，本文将给出这些问题的解决方案：

一、CH395外围电路设计注意

1.CH395的PHY是电压型，网络变压器的中心抽头要接3.3V。

2.CH395的电源引脚退耦电容不可少，而且要靠芯片周围摆放。

3.CH395支持串口，SPI和并口（仅CH395L支持）接口，在芯片上电时，395根据SEL和TXD引脚的电平来决定采用哪种方式。

4.为了在电源上电期间有效复位并减少外部干扰，可以在RSTI引脚与地之间接一个0.1UF的电容。

5.具体接法可以上沁恒官网（www.wch.cn）上搜索CH395EVT。

二、初始化失败

1.首先检查“check_exist”命令，正常情况下395会将该命令的输入值按位取反后输出，若该命令不正常，则说明395的通讯接口有问题，请注意接口时序，检查CH395接口选择模式配置是否正确，即检查TXD，SEL电平状态是否正确。

2.395初始化参数设置好后，先延时20ms左右，再执行初始化命令。

3.注意395的网络参数的合法性，设置不规范的ip地址可能会导致395网络出错。

三、与电脑无法建立TCP连接

1. 连接之前先将电脑的网络防火墙关闭。

2.对于多网卡的电脑，在设置电脑端网络调试软件时要注意选择正确的网卡，最好是打开软件前，将其他网卡都禁用。

3.先ping一下395，若ping不通，则先检查网口的指示灯是否亮着，若不亮则换一根网线再试；若网口灯亮，则可能395初始化没有正确完成

4.检查395初始化配置的信息是否正确，目的ip与端口是否与电脑端设置相同`，TCP连接要注意ip地址处于同一网段，如果是在路由器局域网环境下，还要考虑395ip地址避免冲突。

5.TCP正常连接时，395的INT引脚会给出中断低电平信号，可以通过读取命令来获取中断状态

6.若出现连接断开后不能再次连上的问题，则可能是因为395在检测到连接断开后自动关闭了socket，可以通过在socket断开与超时中断里重新打开socket。

7.初始化socket之前没有将socket配置信息表清空。

四、数据接收与发送问题

1.若395接收到数据，会产生数据接收中断信号，检测395的INT引脚是否有低电平产生，注意如果使用单片机外部中断，则触发位要设置为低电平触发。若有中断信号，则读取中断状态，对照头文件里的定义，获取中断含义。

2.检查395接收中断的处理，正常流程是：获取中断、读取数据长度，读取数据内容。

3.UDP server 模式下的数据收发与其他模式不一样：数据接收时，395会在数据包前加上8个字节的信息，分别是数据包长度，源端口，源ip。在接收中断处理任务里，需要将这些信息分离并保存。数据发送时，395使用395UDPSendTo（）函数，函数参数需要使用上面的信息。

4.与395发送相关的中断有两个，分别是发送完成中断与发送缓冲区空闲中断；单片机向395发送缓冲区写一包数据，395会将数据复制到MAC缓冲区，复制完毕后会产生发送缓冲区空闲中断；CH395可能会将数据分装成若干包数据包，每发送一包数据包，395都会产生一次发送完成中断；因此在实际发送时，必须要等到发送缓冲区空闲中断产生后，才能向395缓冲区填写下一次数据。

5.395在数据收发过程中出现数据丢包现象：

（1）395在收发数据的过程中不能被其他进程打断，如果395在数据收发中被其他任务打断，则可能会导致数据丢包。

（2）检查下定义接收缓冲区大小，读取接收长度，看是否超过了接收缓冲区。接收缓冲区在定义的时候至少要大于定义的TCP MSS的值。

五、芯片发热

由于CH395内部集成MAC和PHY，发热量稍大，但不会影响芯片稳定性。可通过以下方式改进：

（1）芯片RSETE 脚参考电阻18K。

（2）改善电源，如使用DC电源代替LDO，减小部分功耗。

（3）启用CH395低能耗模式。

六、编程注意事项

（1）芯片内置上电复位电路，主程序开始先延时200ms时间，留给CH395足够的上电复位时间，防止单片机上程序开始运行而CH395仍处于复位状态。

（2）芯片初始化之后，建议先做测试命令，确保基本通信正常后再进行下面的操作。

（3）假如程序中有设置MAC地址操作，需要延时200ms左右时间。

（4）批量发送数据时，每次发送数据前要确保前一次数据已经发送完成（可通过查询SINT_STAT_SENBUF_FREE中断来实现）。

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本文由扶摇转载自沁恒，原文标题为:CH395常见问题汇总及解答，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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沁恒（WCH）通讯接口芯片和全栈MCU选型指南

目录- 企业简介接口转换产品 MCU产品选型 USB转串口产品选型低功耗蓝牙系列单片机系列网络系列 USB系列 USB PD协议系列/ Type-C快充系列 PCI/PCIE 系列显示驱动及键盘扫描系列单片机外围系列通讯接口芯片和全栈MCU芯片产品方案

型号- CH24X,CH36X,CH32V103C6T6,CH32F205RBT6,CH370,CH372,CH343G,CH374,CH132,CH32F203C8T6,CH252,CH376,CH343K,CH375,CH378,CH440G,CH583M,CH32V208WBU6,CH32V208RBT6,CH341T,CH32V003J4M6,CH32V203系列,CH32F103C6T6,CH32V305RBT6,CH382,CH342F,CH384,CH342K,CH221K,CH37X,CH9374B,CH237,CH236,CH58X,CH340K,CH32F103C8U6,CH22X,CH34X,NET-232-9120,CH582M,CH340N,CH340T,NET-SER-DT TTL,CH32V208GBU6,CH341B,CH341A,CH341F,CH32V203C8T6,CH231,CH486F,CH351,CH235,CH234,CH35X,CH247,CH368,CH484M,CH23X,CH32V307,CH32V203G6U6,CH582F,CH340E,CH482,CH32V305,CH481,CH32F203C8U6,CH340C,CH484,CH32V203C8U6,CH32V303,CH340B,CH241,CH483,CH365,CH486,CH364,CH340G,CH246,CH367,CH4XX,CH366,CH578,CH457,CH9339,CH577,CH32V303VCT6,CH335,CH456,CH9338,CH579,CH337,CH32V,CH56X,CH339,CH32V003A4M6,CH32F,BLE-TPT-A-ANT,CH32F203C6T6,BLE2U-A-ANT,CH565M,CH451,CH9102,CH9344,CH571,CH450,CH444G,CH9101,CH9343,CH453,CH573,CH452,CH334,CH455,CH9340,NET-TTL-9120,CH454,CH563Q,CH347,CH9328,CH226,CH57X,CH225,CH348,CH9329,CH9326,CH9342G,CH32F208RBT6,CH581,CH583,CH341,CH462,CH582,CH32F203VCT6,CH32F208WBU6,CH340,CH343,CH342,CH221,CH463,CH345,CH224,CH443K,CH344,CH556,CH344Q,CH555,CH558,CH557,CH559,CH317,CH438,CH54X,NET-485-9120,CH9434,CH319,CH224D,CH563L,CH442E,CH32V203C6T6,CH552,CH32V307VCT6,CH551,CH554,CH224K,CH432,CH567,CH343P,CH446,CH445,CH569,CH561Q,CH448,CH55X,CH568,CH440R,CH31X,CH449,CH440P,CH9340K,CH9340C,CH32F207VCT6,CH561,CH440,CH563,CH442,CH344L,CH565,CH444,CH443,CH32V203F8P6,CH412,BLE-TPT-B-ANT,CH32V303RCT6,CH52X,CH32V103R8T6,CH32V003系列,CH448F,CH32F203K8T6,CH32V203F8U6,NET-SER-DT RS232,CH9103M,CH9143,CH93XX,CH9145,CH9140,CH32V203G8R6,CH9142,CH532,CH9141,CH531,CH545,CH424,CH544,CH423,CH547,CH546,CH446Q,CH549,CH9126,CH446X,CH53X,CH548,CH32F103R8T6,BLE-DONGLE,CH32F203RCT6,NET-SER-DT RS485,CH9104L,CH541,CH540,CH543,CH422,CH32V003,CH542,CH421,CH32V003F4P6,CH9101Y,CH445P,CH32V303RBT6,CH9101N,CH9101R,CH9101U,CH9101H,CH32V307RCT6,CH32V203K8T6,CH9121,CH9120,CH32V307WCU6,CH32V303系列,CH347T,CH522,CH9102X,CH444P,CH525,CH524,CH9104,CH527,CH9103,CH528,CH565W,CH9344L,BLE-SER-A-ANT,CH348L,CH348Q,CH32V203F6P6,CH521,CH9350,CH32V203RBT6,CH9102F,CH483M,CH32F203CBT6,CH32V103C8T6,CH483X,CH91XX,CH581F,CH32F103C8T6,CH32F207,CH32F205,CH32F203,CH32V103C8U6,CH32V003F4U6,CH482X,CH32F208,CH181,CH32V208,CH182,CH32V103系列,CH32V203,BLE2U-C-ANT,CH32V208CBU6,CH914X,CH449X,CH32V303CBT6,CH32V305FBP6,CH390,CH392,CH32V203K6T6,CH482D,CH395,CH397,CH38X,CH569W,CH315S,BLE232-NEP,CH32F103,CH449F,CH32V103,CH39X,CH9150,CH481D

2022/12/06 - 沁恒 - 选型指南代理服务技术支持批量订货

沁恒（WCH）通讯接口芯片和全栈MCU选型指南

目录- 企业简介接口转换产品 MCU产品选型 USB转串口产品选型低功耗蓝牙系列单片机系列网络系列 USB系列 USB PD协议系列 PCI/PCIE 系列显示驱动及键盘扫描系列单片机外围系列产品方案

型号- CH32V103C6T6,CH32F205RBT6,CH343G,CH32F203C8T6,CH343K,CH573F,CH378,CH440G,CH571K,CH32V208WBU6,CH583M,CH32V208RBT6,CH341T,CH32F103C6T6,CH32V305RBT6,CH342F,CH384,CH342K,CH32F103C8U6,CH340K,CH582M,CH340N,CH340T,CH32V208GBU6,CH341B,CH341A,CH571F,CH341F,CH32V203C8T6,CH486F,CH571D,CH368,CH484M,CH32V307,CH582F,CH340E,CH482,CH32F203C8U6,CH32V305,CH481,CH32V203C8U6,CH340C,CH484,CH32V303,CH483,CH486,CH340G,CH246,CH578,CH457,CH32V303VCT6,CH577,CH335,CH456,CH552T,CH579,CH552P,CH577F,CH32F203C6T6,CH9344,CH451,CH450,CH444G,CH453,CH452,CH334,CH455,CH454,CH9328,CH348,CH9329,CH224P,CH9326,CH34B,CH9342G,CH32F208RBT6,CH581,CH583,CH341,CH462,CH32F203VCT6,CH32F208WBU6,CH582,CH340,CH552E,CH343,CH342,CH463,CH552G,CH345,CH224,CH443K,CH344,CH556,CH555,CH558,CH557,CH559,CH317,CH438,CH224D,CH32V203C6T6,CH442E,CH552,CH551,CH554,CH224K,CH551G,CH343P,CH567,CH446,CH445,CH569,CH448,CH568,CH440R,CH449,CH440P,CH573X,CH9340K,CH9340C,CH32F207VCT6,CH440,CH442,CH344L,CH565,CH444,CH443,CH32V303RCT6,CH32V103R8T6,CH448F,CH9103M,CH9143,CH557Q,CH9140,CH532,CH9142,CH545L,CH531,CH9141,CH545,CH544,CH423,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32F203RCT6,CH541,CH540,CH543,CH422,CH542,CH554T,CH445P,CH554P,CH32V303RBT6,CH9101U,CH579F,CH9101H,CH32V307RCT6,CH32V203K8T6,CH555L,CH9121,CH9120,CH579M,CH522,CH9102X,CH525,CH444P,CH524,CH527,CH528,CH578F,CH554E,CH9344L,CH578M,CH348L,CH554G,CH348Q,CH521,CH9102F,CH9350,CH483M,CH32F203CBT6,CH32V103C8T6,CH483X,CH549L,CH549F,CH549G,CH581F,CH32F103C8T6,CH32F207,CH32F205,CH559T,CH32F203,CH32V103C8U8,CH482X,CH32F208,CH548G,CH32V208,CH548L,CH32V203,CH548N,CH32V208CBU6,CH558T,CH32V303CBT6,CH547G,CH392,CH547F,CH482D,CH395,CH559L,CH547L,CH397,CH32F103,CH546G,CH32V103,CH558L,CH546L,CH481D

2022/01 - 沁恒 - 选型指南代理服务技术支持批量订货

沁恒以太网选型表

沁恒网络以太网系列产品选型表，覆盖PHY芯片、网络透传芯片、TCP/IP协议栈芯片、10/100M以太网控制芯片、USB转以太网、串口转以太网芯片；集成TCP/IP协议栈，可轻松实现网络与其他接口间的数据双向传输，降低串口设备联网难度，广泛应用于工业控制如伺服、变频器等，通信ICT领域、消费电子如摄像仪、监控等。

电源电压（VDD 接电源正极，GND 接地）

LQFP 封装；64 脚；本体 10x10mm

MDI/MDIX极性自动转换，扩展8路GPIO，命令化控制，快速连接以太网。

选型表 - 沁恒立即选型

【产品】沁恒以太网协议栈管理芯片CH395，集成10/100M以太网MAC和PHY，用于单片机系统进行以太网通讯

沁恒CH395是以太网协议栈管理芯片，用于单片机系统进行以太网通讯。CH395芯片自带10/100M 以太网介质传输层(MAC)和物理层(PHY)，完全兼容IEEE802.3 10/100M 协议，内置了IP、DHCP、ARP、ICMP、IGMP、UDP、TCP等以太网协议栈固件。单片机系统可以方便的通过CH395芯片进行网络通讯。

2022-07-25 - 产品代理服务技术支持批量订货

沁恒邀您莅临2024慕尼黑上海电子展

沁恒携青稞RISC-V系列MCU与多维度、多层次USB/蓝牙/以太网接口芯片精彩亮相：高性能低功耗蓝牙、USB接口转换、Type-C PD等特色板块，计算机手机周边、物联网、工业控制等场景专题，9大版面向您全方位展示沁恒全栈自研的产品体系如何针对具体应用深度优化，让专业接口更加易用，让方案开发更加便捷。

2024-07-06 - 原厂动态代理服务技术支持批量订货

CH334U IC RoHS (SGS) Test Report (CANEC2304439901)

型号- CH32V103C6T6,CH32F103VCT6,CH32F205RBT6,CH32V103VBT6,CH370,CH251,CH372,CH132,CH374,CH252,CH376,CH375,CH378,CH32V107RCT6,CH32V208WBU6,CH32V403CBT6,CH32V003J4M6,CH32F103C6T6,CH382,CH384,CH32V305WBU6,CH237,CH358,CH32F107RCT6,CH236,CH357,CH32F103C8U6,CH238,CH359,CH32L103J4M6,CH32V103VCT6,CH590,CH350,CH471,CH592,CH591,CH231,CH352,CH351,CH472,CH593,CH233,CH354,CH232,CH353,CH235,CH356,CH234,CH355,CH248,CH247,CH368,CH249,CH32V107RBT6,CH32V203G6U6,CH482,CH360,CH481,CH242,CH484,CH241,CH483,CH244,CH365,CH486,CH122,CH243,CH364,CH246,CH367,CH245,CH366,CH457,CH578,CH3232,CH335,CH456,CH577,CH32V303VCT6,CH217,CH338,CH459,CH337,CH458,CH579,CH334U,CH339,CH32V003A4M6,CH32V405RBT6,CH570,CH330,CH451,CH572,CH450,CH571,CH332,CH453,CH574,CH331,CH452,CH573,CH213,CH334,CH455,CH576,CH454,CH575,CH226,CH347,CH225,CH228,CH227,CH348,CH32V403G6U6,CH32V407VCT6,CH32L103G6U6,CH581,CH341,CH462,CH583,CH340,CH582,CH32F208WBU6,CH343,CH464,CH221,CH342,CH463,CH224,CH345,CH344,CH465,CH314,CH556,CH313,CH555,CH316,CH558,CH315,CH557,CH318,CH317,CH438,CH559,CH319,CH32L103F4U6,CH32F103VBT6,CH552,CH32L103FBP6,CH551,CH312,CH554,CH311,CH432,CH553,CH446,CH567,CH445,CH448,CH569,CH447,CH568,CH449,CH32F207VCT6,CH440,CH561,CH321,CH442,CH563,CH441,CH562,CH323,CH444,CH565,CH322,CH443,CH564,CH413,CH534,CH412,CH533,CH536,CH538,CH537,CH539,CH32V103R8T6,CH9936,CH9937,CH32V203F8U6,CH32V403C6T6,CH530,CH32V203G8R6,CH411,CH532,CH410,CH531,CH424,CH545,CH423,CH544,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32V403F8P6,CH32V407RCT6,CH541,CH32L103CBT6,CH540,CH422,CH543,CH421,CH542,CH633,CH632,CH635,CH32V003F4P6,CH634,CH516,CH637,CH636,CH639,CH638,CH32L103F4P6,CH32V307RCT6,CH32L103CBU6,CH631,CH32V203G8P6,CH523,CH522,CH643,CH525,CH524,CH527,CH526,CH529,CH528,CH32V203F6P6,CH521,CH642,CH520,CH641,CH32F107RBT6,CH32F203CBT6,CH32V105RBT6,CH32V103R6T6,CH32V403G8P6,CH622,CH621,CH32V003F4U6,CH32F103R6T6,CH32F105RCT6,CH32V403F6P6,CH32L103G8P6,CH32V105RCT6,CH32V403F8U6,CH32V403G8R6,CH32V303CBT6,DM7407,CH32L103F8U6,CH32V305FBP6,CH32L103F6P6,CH32V405FBP6,CH32L103G8R6,CH32V403K6T6,CH9415,CH9413,CH9414,CH9412,CH32F107VBT6,CH8572,CH8571,CH32F203C8T6,CH8570,CH9884,CH32V208RBT6,CH32L103C6T6,CH32V305RBT6,CH9516,CH9514,CH9515,CH9512,CH9513,CH9511,CH32V208GBU6,CH32L103F8P6,CH9882,CH32V203C8T6,CH9626,CH9627,CH9624,CH9625,CH9622,CH9623,CH32F105RBT6,CH9628,CH9629,CH32F203C8U6,CH32V203C8U6,CH9578,CH9576,CH9577,CH32V405WBU6,CH32V403C8T6,CH32F103RCT6,CH32V103RBT6,CH9100,CH9342,CH32F203C6T6,CH9341,CH9102,CH9344,CH9101,CH9343,CH9463,CH9340,CH9328,CH9327,CH9569,CH9329,CH9326,CH9565,CH9325,CH9445,CH9566,CH32V107VCT6,CH32L103C8T6,CH32V403C8U6,CH32F208RBT6,CH9331,CH9574,CH9330,CH9575,CH9573,CH32F203VCT6,CH9317,CH9318,CH9438,CH9435,CH9436,CH9315,CH9433,CH9434,CH32F107VCT6,CH32L103C8U6,CH32V103RCT6,CH9320,CH32V203C6T6,CH32V307VCT6,CH9426,CH32V107VBT6,CH32V403VCT6,CH9431,CH9552,CH9432,CH32V203F8P6,CH32V303RCT6,CH32L103K6T6,CH32F203K8T6,CH9144,CH32L103A4M6,CH9143,CH9145,CH9140,CH9142,CH9141,CH9126,CH32V407WCU6,CH32F105VCT6,CH32F203RCT6,CH9375,CH9374,CH9371,CH9370,CH9373,CH9130,CH9372,CH32V303RBT6,CH32F103RBT6,CH32V203K8T6,CH9122,CH9121,CH9120,CH32V307WCU6,CH9104,CH9346,CH9103,CH9345,CH32V403RCT6,CH32F203RBT6,CH9232,CH9110,CH9234,CH9230,CH9350,CH32V203RBT6,CH32V103C8T6,CH32V403K8T6,CH32L103K8T6,CH32F103C8T6,CH32V403RBT6,CH32V103C8U6,CH32V105VCT6,CH181,CH183,CH182,CH32V208CBU6,CH390,CH392,CH32V203K6T6,CH394,CH9165,CH396,CH395,CH32L103GBU6,CH398,CH397,CH9161,CH32F105VBT6,CH32V105VBT6,CH9397,CH9150,CH9153,CH9152

31 Mar 2023 - 沁恒 - 测试报告代理服务技术支持批量订货

CH395以太网协议栈芯片数据手册

型号- CH395L,CH395Q,CH395

2016/3/2 - 沁恒 - 数据手册代理服务技术支持批量订货

助力电力行业国产化 | 沁恒USB/蓝牙/以太网接口芯片及全栈MCU亮相电力行业盛会

4月9日~10日，沁恒携“自主核中国芯”主题亮相杭州第四十八届中国电工仪器仪表产业发展技术研讨会及展会，依托多层次USB/蓝牙/以太网接口芯片、青稞RISC-V全栈MCU等关键技术自主可控的中国芯，向行业客户展示专业、可靠、丰富的解决方案，助力电力行业智能化，推动国产替代2.0。

2024-04-15 - 原厂动态代理服务技术支持批量订货

以太网协议栈芯片 CH395手册

型号- CH395L,CH395Q,CH395

2024/3/8 - 沁恒 - 数据手册 - 版本：1E 代理服务技术支持批量订货

【产品】网络串口透传芯片CH9121集成TCP/IP协议栈，串口波特率最高可支持到921600bps

沁恒推出的网络串口透传芯片CH9121集成TCP/IP 协议栈，可实现网络数据包和串口数据的双向透明传输，具有TCPCLIENT、TCP SERVER、UDP 3 种工作模式，串口波特率最高可支持到921600bps。

2022-07-15 - 产品代理服务技术支持批量订货

沁恒USB蓝牙以太网，全栈MCU让连接更简单

型号- CH390,CH592,CH591,CH9121,CH9143,CH571,CH395,CH573,CH397,CH9120,CH9142,CH9141,CH32X035,CH569,CH32V208,CH32V307,CH182,CH581,CH32V305,CH583,CH32V303,CH582,CH32V103,CH32V203,CH565,CH32V003

2023/8/21 - 沁恒 - 商品及供应商介绍代理服务技术支持批量订货