C8051F120+CP2200：嵌入式以太网开发平台指南

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"C8051F120+CP2200组成的以太网开发平台，包含硬件电路设计、协议解析以及TCP/IP配置向导的使用方法，旨在帮助开发者进行嵌入式以太网应用的开发。" 这篇用户指南详细介绍了基于C8051F120微控制器和CP2200的嵌入式以太网开发平台。C8051F120是一款高性能的微控制器，常常用于需要高速处理和实时响应的嵌入式系统中。CP2200则可能是一款以太网控制器或PHY芯片，负责实现物理层的通信，连接微控制器与网络。该开发平台提供的硬件部分包括C8051F120目标板和AB4以太网开发板，这些硬件组件是构建嵌入式以太网系统的基础。此外，还有一块USBD模块，可能是用于USB设备接口，使得开发板可以与个人电脑或其他USB设备进行通信。软件方面，开发平台采用了经过行业验证的CMX Micronet™协议栈，这是一种专门为嵌入式处理器设计的TCP/IP协议栈。这个协议栈的优势在于其易于使用的库形式，且可自由分发。为了简化开发流程，开发平台还提供了一个TCP/IP配置向导。该向导能够根据用户选择的特定协议生成优化过的库代码，并自动生成框架代码，以便于在Silicon Laboratories的集成开发环境(IDE)中管理项目。 TCP/IP配置向导的使用极大地方便了开发者，它不仅生成高度定制化的库，还提供了项目文件，使得开发者可以直接在IDE中开始编程。关于TCP/IP库和配置向导的更深入信息，如API详细描述，可以在应用笔记"AN237:TCP/IP库程序员指南"中找到。 C8051F120+CP2200开发平台为开发者提供了一套完整的工具，涵盖了硬件设计、协议栈以及开发工具，帮助开发者快速、高效地构建和调试嵌入式以太网应用。无论是初次接触嵌入式以太网的开发者，还是有经验的专业人士，都能从中受益。通过学习和使用这套平台，开发者能够掌握如何利用C8051F120微控制器和CP2200芯片实现以太网功能，以及如何利用TCP/IP协议栈进行通信。

Ethernet-DK

Rev. 0.3 5

4.1. Network Setup Procedure

If using a standard cable:

1. Connect the AB4 Ethernet Development Board to an Ethernet wall outlet or to a router/switch using a

standard Ethernet cable.

2. Connect a PC to the same Ethernet network using a standard Ethernet cable.

If using a crossover cable:

1. Connect the AB4 Ethernet Development Board directly to a PC using an Ethernet crossover cable.

2. Configure the PC to have a static IP address. The steps below show how to configure a Windows PC to use

a static IP address.

a. Open the Network Connections Folder. This is accessible from the control panel or from the start menu by right-

clicking on My Network Places and selecting Properties.

b. Right-click on the Local Area Connection and select Properties.

c. Select Internet Protocol (TCP/IP) and click Properties. Optionally, if the Show icon in notification area when connected

is checked, right-clicking the system tray icon will provide a quick shortcut to the LAN properties dialog and can be

used as an indicator that the network is functioning properly.

d. Select Use the following IP address and specify an IP address and subnet mask for the PC. For a subnet mask of

255.255.255.0, the embedded system’s IP address must match the first three octets of the PC’s IP address for the PC

to recognize the embedded system. See Section 4.2 for additional information about choosing the embedded

system’s IP address.

Note: When entering an IP or subnet address into the dialog box, the cursor will automatically advance to the next

field for a three digit octet. If entering a one or two digit octet, the spacebar, right arrow key, or ‘.’ can be pressed to

advance to the next field.

e. Click OK after the static IP address and subnet mask have been configured. The PC will now be able to access the

embedded system using a crossover cable.

Ethernet-DK

6 Rev. 0.3

4.2. Selecting an IP Address for the Embedded System

For a PC to recognize an embedded system on a network, its IP address and subnet mask need to be configured.

Below are a few guidelines to follow when choosing an IP address for the embedded system. Figure 6 shows an

example of a compatible PC and embedded system IP address combination.

1. Find the IP address and Subnet mask for the PC. If a Default Gateway is specified, then save this address for

later use. If you are using a crossover cable, you may choose any IP address for your PC as long as the

Subnet mask allows it to recognize the embedded system.

2. The IP address chosen for the embedded system must match the PC’s IP address in all bit locations where

the Subnet mask is a 1 in order for the PC to recognize the embedded system. Otherwise, the PC will send

it’s request outside the local network.

3. Do not duplicate IP addresses or select a broadcast address. An IP address is considered a broadcast

address if all bits which are 0 in the Subnet mask are 1 in the IP address. Broadcast addresses with

additional 1s such as 10.10.255.255 (Figure 6) can be broadcast to nodes outside the local network.

4. The address 255.255.255.255 is known as the Ethernet broadcast address and is used when the Subnet

mask for the network is not known. Any packet transmitted to this address will reach all nodes on the local

network but cannot go further than the nearest router.

4.3. IP Address Selection Example

The example in Figure 6 shows the IP address and subnet mask of the PC we want to connect to the embedded

system. Since the first 24 bits of the subnet mask are 1, the first 24 bits of the embedded web server’s IP address

(shown in bold) must match the PC’s IP address. Only the least significant 8 bits may vary making the valid range

of IP addresses for the embedded web server 10.10.10.0 to 10.10.10.254 with the exception of 10.10.10.80 since

this address is already taken by the PC. 10.10.10.255 is reserved because it is the broadcast address for this

network.

Figure 6. IP Address Selection Example

PC IP Address

PC Subnet Mask

Embedded Web Server IP Address

0000 1010 0000 1010 0000 1010 0101 0000

10 10 10 80

1111 1111 1111 1111 1111 1111 0000 0000

255 255 255 0

(decimal)

(binary)

(decimal)

(binary)

0000 1010

1010 0011

163

(decimal)

(binary)

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