the code is completed, I set up the GPRS data-transmission system software, to achieve the PPP, UDP, IP protocol layering and packaged to achieve the design of embedded UDP/IP protocol stack

Packet : 51622447pppcode.rar filelist
test.c
udp.c
udp.h
at89x51.H
commdrv.c
commdrv.h
icmp.c
icmp.h
ip.c
ip.h
main.c
modemdrv.c
modemdrv.h
notation.h
ppp.c
ppp.h

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