Other Parts Discussed in Thread: TM4C1294NCPDT
I'm using the MCU SDK with networking on a LM3S9B92.
I have configured it wit a static IP address, and it works well.
How do I change the IP Address from my code? (I would like to read it from EEPROM on startup)
Hi George Cerff,
The quick answer is you need to use one of the available NDK hook functions to change the IP address, more specifically you can do this with the "stack thread begin hook".
The IP address configuration happens at run time in some C code that is auto generated, based on the settings chosen in the BIOS configuration file (*.cfg file).
When you choose a static IP address from the BIOS configuration, some global values similar to the following will be generated:
/* Static IP Address settings */
char *LocalIPAddr = "192.168.1.2";
char *LocalIPMask = "255.255.254.0";
char *GatewayIP = "0.0.0.0";
char *DomainName = "demo.net";
These values will be used when the NDK is initializing. So you can write a hook function that overrides these globals (or just the LocalIPAddr value if you want) *before* this initialization happens.
You could have a function similar to this:
extern char *LocalIPAddr;
void readIPAddr()
{
*LocalIPAddr = /* read IP address value from ROM and assign it here */
}
Then you can set it to the value for "stack thread begin hook" in your configuration. This will result in your function readIPAddr being called in the beginning of the NDK stack thread:
Steve
