PIC以太网开发板——基于微芯最新ENC28J60以太网控制器

Microchip TCP/IP Stack v3.75.6 协议栈说明介绍

• Introduction


• Directory Structure
• Configuration
  
  • The config.h file
  • Hardware configuration files
  • Main application source code
• Building the code image
  
• Uploading the HTTP documents
• Testing the TCP/IP Stack
  
  • Sending ICMP requests (ping)
  • Using Microchip's Ethernet Discoverer
  • Using the serial interface
  • Testing the HTTP server
  • The udptest module
• Connecting to the Internet

Testing the TCP/IP Stack

After building the code and programming the microcontroller, you may have to perform a Power-On-Reset (power cycle) if you changed the microcontroller's configuration bits since the microcontroller only loads them after a Power-On-Reset and not after a normal Reset.

If everything is correct the LED connected to the pin mapped to LED0_IO will start blinking about once a second, and if you have a LCD module, it will show a series of message screens that will include an initial screen with the software version number, and then after a small delay the current time (if you compiled the time and SNTP modules using the USE_TIME and STACK_USE_SNTP options in the config.h file) and the values for the IP Transmit and Receive packet counters.

For designs or boards with a two line LCD module, the LCD will cycle between two screens showing for about 5 seconds the current time (or version number if time support has not been included) and then for about 10 seconds the IP packet counters.

If you included the time and SNTP module, until the unit is able to communicate with the NTP server to obtain the reference clock you will see the legend "--/--/-- --:--" on the display indicating that the current clock is not valid, and as soon the unit successfully receives a time update from the NTP server the display will start showing the current date and time.

Figures 1 and 2 below shows an example of the different messages you will see on the LCD for both two and four lines LCD modules.

Figure 1

Figure 2

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