lwIP PPP initialization

gistfile1.txt

I have ppp working in both lwip 1.3.0 and lwip 1.3.2 and would recommend 1.3.2 

First you need ti init the stack and the init ppp 

sys_sem_t sem; 

sem = sys_sem_new(0); // Create a new semaphore. 
tcpip_init(tcpip_init_done, &sem); 
sys_sem_wait(sem); // Block until the lwIP stack is initialized. 
sys_sem_free(sem); // Free the semaphore. 

/* init the PPP stack */ 
pppInit(); 


now dial you modem, performing and init string that your device requires. Once your modem respond with a CONNECT string you are ready to begin ppp session. 

pppSetAuth(PPPAUTHTYPE_NONE, "", ""); 
pppFD = pppOpen((sio_fd_t)MODEM_USART,ModemErrorCB,this); 

the real trick for the gprs modem for me was to also enable the authorization methods in lwipopts.h 

Then a ppp session is negotiated and you can begin the use the stack one the ModemErrorCB is called. 

I hope this helps 

Oh I ripped out the ethernet code since my current project does not require it yet.