i am devoloping with arm7,and using tcp/ip
(TcpNet) ,but i get a very low speed when
communicating with pc;
i don't know whether there is a speed limit of the
tcp/ip stack, will you share me with the debugged
speed limit ?
TCP... transporting real-time signal and control
These two really don't go well together. You might want to try UDP. There's also RTP (Real-Time Protocol) on top of UDP if you need timestamps and sequence numbers.
A normal speed when uploading files with TFTP_demo example is up to 100 KBytes/second. This depends on the cpu clock speed. A speed of 100 kB/s has been measured with 96MHz cpu clock on ARM7 core. You should have in mind that there has been executed several memcpy() to store incomming data into a file on RAM file system.
A Debug version reduces the speed of TCPnet because of 2 reasons: - it uses printf - it uses a polling method for a debug serial transmit
To reach a full speed you should disable a debug and use as less of memcpy() as possible. If you still need a debug version, then you should modify the sendchar() function to use transmit interrupts.