Hi, I am using u-boot. i want to write my own protocol and add a few commands to u-boot for my custom board.
I want to send packets and recieve packets (UDP).
I followed the example as given in tftp.c and am able to send packets. using NetSendUDPPacket.
I did not understand the following:
1)
What do the following do ?.
NetSetTimeout (TIMEOUT * CFG_HZ, TftpTimeout); NetSetHandler (TftpHandler);
All i could make sense it after the timeout, TftpTimeout is called. Is it called under all circumstances or only based on specific circumstances. ( Say if i get a packet. i may not want it to be called). i could not understand beyound this.
What is the precision of the timeout value. are milliseconds allowed ?
Am i right ?.
Why do we require an handler. what does NetStartAgain ( ) do ?. Where does it start again ?. if i want to use it - what should i keep in mind. any variables need to be taken care of ?.
2) What does NetState variable in net.c do ?
I could manage to write a send routine. but recieve i am not able to understand the code. I just want to recieve packets and take some actions (just like a server).
are there any examples for doing this. suppose i dont get a packet say within 1 sec. i may want to do some other thing ?. is it possible in u-boot.
I am a dull idiot. I dont understand easily. Please be elaborate in your answers.
Thanks for Your time. i would appreciate any responses.
Thanks once again.
With Warm Regards, John.