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Microchip TCP/IP Stack v3.75.6
Contents
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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
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Figure 2
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[Click on the images for a larger view]
Also if you have connected serial interface and a terminal program
(the stack default configuration for the serial interface is 19,200 bps,
8 bits, 1 stop bit, no parity) you will see the current IP address on
the terminal screen.
Sending ICMP echo requests (ping)
The most popular program today available in almost any operating
system to test if you can reach a remote IP host is
ping, which sends an ICMP message packet to a remote host requesting
an "echo reply".
The stack (unless it was disabled in the configuration file) includes a
basic ICMP module that will reply to an "echo request".
Be aware that the current version only supports ICMP requests with a
payload no larger than 32 bytes, then in some operating systems
(Windows default is 32 bytes) you will need to specify the packet size.
Figure 3 below shows the command screen after running a ping to a PICNet 1
board running the TCP/IP Stack.
Figure 3
[Click on the image for a larger view]
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