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

Using the serial interface

When the TCP/IP Stack code starts to run after Reset, the code will send the current IP address via the serial interface.

If you compiled the stack code with the ENABLE_BUTTON0_CONFIG option, when you reset the microcontroller and hold low for an instant the I/O pin mapped to BUTTON0_IO the code will run the configuration routine via the serial interface.

Note about configuration information stored in EEPROM:

If you use an external serial EEPROM, the current stack code will reserve the first 64 bytes to write the configuration information, such as IP address, netmask, etc.

When you run the stack code for the very first time the default configuration hard coded in program memory will be written to the serial EEPROM. The next time the stack code starts will load the previously stored configuration from the serial EEPROM.

If you change the default hard coded configuration in the config.h file, you must invalidate the previously stored configuration in the serial EEPROM.

To do so hold low the I/O port mapped to BUTTON0 for at least 4 seconds after reset or while in the serial configuration menu, the old configuration in the serial EEPROM will be mark as invalid, and the serial interface will show a message, the LEDs will turn on for few seconds and the microcontroller will reset automatically.

After Reset the code will write the new default configuration into the serial EEPROM.

Note that the BUTTON0 option to rewrite the configuration in the serial EEPROM and the configuration menu via the serial interface will be included in the code only if you define the ENABLE_BUTTON0_CONFIG macro in the config.h file.

(The stack default configuration for the serial interface is 19,200 bps, 8 bits, 1 stop bit, no parity).

Figure shows the terminal screen after forcing a configuration change.

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