Altera DE2-115 User Manual download pdf (Page 115)

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Nios II Processor

Software Device Drivers

HAL API

MicroC/OS-II

NicheStack TCP/IP Software Component

Application Specific System Initialization

Web Server Application

Figure 6-33 Nios II Program Software Architecture

Finally, the detail descriptions for Software flow chart of the Web Server program are listed in

below:

Firstly, the Web Server program initiates the MAC and net device then calls the get_mac_addr()

function to set the MAC addresses for the PHY. Secondly, it initiates the auto-negotiation process to

check the link between PHY and gateway device. If the link exists, the PHY and gateway devices

will broadcast their transmission parameters, speed, and duplex mode. After the auto-negotiation

process has finished, it will establish the link. Thirdly, the Web Server program will prepare the

transmitting and receiving path for the link. If the path is created successfully, it will call the

get_ip_addr() function to set up the IP address for the network interface. After the IP address is

successfully distributed, the NicheStack™ TCP/IP Stack will start to run for Web Server application.

Figure 6-34 describes this demo setup and connections on DE2-115. The Nios II processor is

running NicheStack™ on the MicroC/OS-II RTOS.

Note: your gateway should support DHCP because it uses DHCP protocol to request a valid IP from the

Gateway, or else you would need to reconfigure the system library to use static IP assignment. Furthermore, the

web server demonstration uses the RGMII or MII interface to access the TCP/IP. You can switch the MAC

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Altera DE2-115 User Manual Page 115