|
From: | Iordan Neshev |
Subject: | [lwip-users] Re: lwIP + PPP |
Date: | Tue, 30 Mar 2010 10:05:02 +0300 |
User-agent: | Thunderbird 2.0.0.21 (Windows/20090302) |
Message: 1
Hmm, sio_read should not filter the input from the device. I'm using a GPRS modem too and I don't have such problems. As a side note - I used to get bad fcs in the past and the problem turned out to be incorrect UART port settings which resulted in big bit error rates for that baud rate.Date: Mon, 29 Mar 2010 14:20:39 +0200 From: Nicolas Dioli <address@hidden> Subject: Re: [lwip-users] lwIP + PPP To: Mailing list for lwIP users <address@hidden> Message-ID: <address@hidden> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hello, i am using lwip 1.3.2 + PPP with FreeRTOS. I have a question about pppInProc.When i receive a ppp packet which start by 0x7E, when the function is testing the fcs: he found an invalid fcs and drop the packet.I don't understand why ( i have already read rfc but i'm lost).perhaps, the packet is wrong: my sio_read return only the packet between 2 flags 0x7E. An didn't return "CONNECT 115200" from the modem GPRS.
Please make sure that every single character from the modem is delivered by sio_read() and tell us
if this helps. Btw, Simon, this may be the same problem as yours. Iordan.
Nicolas Dioli Polytech'Nice-Sophia student
[Prev in Thread] | Current Thread | [Next in Thread] |