首页 stm32-enc28j60-arp

stm32-enc28j60-arp

上传者： chen244798611 | 上传时间： 2025-09-07 12:33:13 | 文件大小： 7.65MB | 文件类型： ZIP
STM32是一款基于ARM Cortex-M内核的微控制器系列，由意法半导体（STMicroelectronics）生产。在本文中，我们将深入探讨STM32如何与ENC28J60网络接口芯片协同工作来实现ARP（地址解析协议）功能。ARP是TCP/IP协议栈中的关键部分，用于将网络层的IP地址映射到数据链路层的物理MAC地址。 ENC28J60是一款经济高效的以太网控制器，适合嵌入式应用。它集成了MAC（媒体访问控制）和PHY（物理层）功能，能够处理以太网帧的发送和接收。STM32通过SPI（串行外围接口）与ENC28J60通信，进行数据交换和配置。 1. **STM32与ENC28J60的接口**：STM32的SPI端口被用作与ENC28J60的接口。SPI是一种同步串行通信协议，通常由四个信号线组成：MISO（主输入/从输出）、MOSI（主输出/从输入）、SCK（时钟）和SS（从机选择）。STM32作为SPI主机，通过这些线发送命令和接收数据。 2. **ARP协议简介**：ARP协议是IPv4网络中解决IP地址与MAC地址对应关系的一种方法。当设备需要向另一个网络设备发送数据时，如果只知道对方的IP地址，就需要通过ARP查询获取其MAC地址。ARP请求广播到整个局域网，目标设备接收到请求后，回复自己的MAC地址。 3. **STM32实现ARP**：在STM32上实现ARP涉及以下步骤： - **ARP缓存管理**：STM32维护一个ARP缓存表，存储已知的IP-MAC映射。当需要发送数据时，首先检查缓存，如果找到对应的条目，直接使用MAC地址。 - **ARP请求构造**：当目标IP不在缓存中，STM32构建一个ARP请求帧，包含自身的IP和MAC地址以及目标IP。 - **ARP请求发送**：通过SPI将请求帧写入ENC28J60，然后发送到网络。 - **ARP应答处理**：当收到ARP应答时，STM32解析帧内容，更新ARP缓存，并保存目标MAC地址。 - **ARP老化和刷新**：为了保持ARP缓存的准确性，需要定期检查并删除过期条目，同时在通信过程中适时更新缓存。 4. **c8t6-enc28j60-arp**：这个文件名可能是项目的代码库或示例，包含了使用STM32的Cortex-M8（或C8T6）核心与ENC28J60进行ARP操作的实现。可能包括初始化、数据传输、ARP请求和应答处理等功能的源代码。 STM32与ENC28J60结合，可以为嵌入式系统提供网络连接能力，而ARP协议确保了IP数据包能正确地在物理网络上传输。通过理解和实现STM32与ENC28J60的交互，以及ARP协议的流程，开发者可以创建具备完整网络功能的智能设备。

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