| |
|
Description
The Celeritous PICWEB1 Embedded web server is a small module featuring the
new Microchip PIC18F67J60 8-bit microcontroller with integrated Ethernet
controller on the chip.
The PICWEB1 module includes all the support components for the PIC18F67J60
plus a 25LC256 serial EEPROM, a USB interface based on the FTDI FT232RQ
USB controller and as an option a DS2502-E48 from Dallas-Maxim holding an
IEEE assigned 48-bit MAC address.
A demo board is available where you plug in the PICWEB1 module, adding
a power supply connector with a voltage regulator, the classic RJ12-6
connector for ICSP with an ICD2, Reset and four push buttons, four LEDs
and a TMP121 digital temperature sensor.
The PICWEB1 ships with the PIC18F67J60 preloaded with a customized version
of the Microchip TCP/IP Stack v.4.02 but I also created a hardware profile
and tested it with the modified version of the 3.75 TCP/IP Stack.
|
Celeritous PICWEB1
[Click Image to Enlarge]
|
Design considerations
The PICWEB1 Demo Kit includes everything you need to get started, the PICWEB1
module, the demo board, a cross-over and straight ethernet cables, USB cable,
power supply and a CD with additional information and drivers that let you
use the USB interface on the PICWEB1 that is connected via two jumpers to the
PIC18F67J60 UART.
External memory
As mentioned before the PICWEB1 module includes a 25LC256 Serial EEPROM that will
be used for storing configuration information and HTTP server documents.
Microcontroller Clock Frequency
To support the internal Ethernet controller, the PIC18F67J60 requires a clock
source of 25MHz, but the TCP/IP stack code set the configuration bits to use
the PLL block to generate an internal cpu clock of about 41.6667MHz.
Schematics
Detailed schematics and a Quick Start Guide are included in the CD
distributed with the demo kit and additional information can be
obtained on Celeritous Website.
|
Getting the board up and running
Compiling the 3.75 for the PICWEB1 is a simple task, it requires few
software tools available for download from Microchip's
website at no cost, and obviously the TCP/IP stack source code distribution and a
PIC programmer. For this project I used Microchip's
MPLAB ICD2 as a programmer.
With the latest modified version of the
Microchip TCP/IP Stack v3.75, the process is quite simple.
This new version adds the PICWEB1 macro definition that
combined with the device selection for the Microcontroller generates the appropriate
code for this particular project.
The software distribution includes the MPLAB IDE project file
PICWEB1.mcp, load this project into MPLAB IDE,
select the correct processor (by default the project has selected the PIC18F97J60)
and verify that the settings on the config.h and
picweb1.h files apply to your project or modify them
accordingly (both files are located in the include
subdirectory of the main src directory).
For additional details check the README.TXT file
included in the software distribution.
For a detailed explanation about how to build Microchip's TCP/IP stack
for this or similar projects Click Here.
|
Datasheets for relevant parts used in this project
Useful Links
TCP/IP Stack Source code and useful software tools
Additional Resources
|
|
|
