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5.2 TCP/IP Sample Programs
We have provided a number of sample programs demonstrating various uses of TCP/IP for
networking embedded systems. These programs require that you connect your PC and the
Smart Star together on the same network. This network can be a local private network
(preferred for initial experimentation and debugging), or a connection via the Internet.
5.2.1 How to Set IP Addresses in the Sample Programs
With the introduction of Dynamic C 7.30 we have taken steps to make it easier to run
many of our sample programs. You will see a TCPCONFIG macro. This macro tells
Dynamic C to select your configuration from a list of default configurations. You will
have three choices when you encounter a sample program with the TCPCONFIG macro.
1. You can replace the TCPCONFIG macro with individual MY_IP_ADDRESS ,
MY_NETMASK , MY_GATEWAY , and MY_NAMESERVER macros in each program.
2. You can leave TCPCONFIG at the usual default of 1, which will set the IP configurations
to 10.10.6.100 , the netmask to 255.255.255.0 , and the nameserver and gateway
to 10.10.6.1 . If you would like to change the default values, for example, to use an IP
address of 10.1.1.2 for the CPU Card, and 10.1.1.1 for your PC, you can edit the
values in the section that directly follows the “General Configuration” comment in the
TCP_CONFIG.LIB library. You will find this library in the LIB\TCPIP directory.
3. You can create a CUSTOM_CONFIG.LIB library and use a TCPCONFIG value greater
than 100. Instructions for doing this are at the beginning of the TCP_CONFIG.LIB
library in the LIB\TCPIP directory.
There are some other “standard” configurations for TCPCONFIG that let you select differ-
ent features such as DHCP. Their values are documented at the top of the
TCP_CONFIG.LIB library in the LIB\TCPIP directory. More information is available in
the Dynamic C TCP/IP User ’s Manual .
IP Addresses Before Dynamic C 7.30
Most of the sample programs use macros to define the IP address assigned to the CPU Card
and the IP address of the gateway, if there is a gateway. Instead of the TCPCONFIG macro,
you will see a MY_IP_ADDRESS macro and other macros.
#define
#define
#define
#define
MY_IP_ADDRESS "10.10.6.170"
MY_NETMASK "255.255.255.0"
MY_GATEWAY "10.10.6.1"
MY_NAMESERVER "10.10.6.1"
In order to do a direct connection, the following IP addresses can be used for the CPU Card:
#define MY_IP_ADDRESS "10.1.1.2"
#define MY_NETMASK "255.255.255.0"
// #define MY_GATEWAY "10.10.6.1"
// #define MY_NAMESERVER "10.10.6.1"
In this case, the gateway and nameserver are not used, and are commented out. The IP
address of the CPU Card is defined to be 10.1.1.2 . The IP address of you PC can be
defined as 10.1.1.1 .
User ’s Manual
53
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