Re: [lwip-users] PPP with NO_SYS=1 in an interrupt context

[Mehmet Ali Ekici]

Hi,

I have checked it with 9600 baud too there is no framing errors for the port. Here is the logs.

We are using  SIM900D from simcom as GPRS modem.

 

I expect fcs to be “6b e4” but log says 0x70d6.  How can fcs be calculated over the received frame to check if fcs correct or not ?

 

7e ff 03 c0 21 0a 08 6b e4 7e

pppInProc[0]: got 10 bytes

pppInProc[0]: Dropping bad fcs 0x70d6 proto=0xc021

 

 

Executing command  : ATDt*99#

 

CONNECT

<CR><LF>CONNECT<CR><LF> len = 11 : 0

Received expected result : CONNECT

pppInit

lcp_init: xmit_accm=0 0 0 0

pppOpen: COM1

pppOverSerialOpen: unit 0: Connecting

pppStart: unit 0

ppp_set_xaccm[0]: outACCM=0 0 0 0

ppp_send_config[0]: outACCM=ff ff ff ff

ppp_recv_config[0]: inACCM=0 0 0 0

lcp_lowerup: asyncmap=0 0 0 0

LCP: lowerup state 0 (LS_INITIAL) -> 2 (LS_CLOSED)

auth_reset: 0

lcp_addci: L opt=2 0

lcp_addci: L opt=5 24f8b455

lcp_addci: opt=7

lcp_addci: opt=8

pppWrite[0]: len=44

ff 7d 23 c0 21 7d 21 7d 21 7d 20 7d 34 7d 22 7d 26 7d 20 7d 20 7d 20 7d 20 7d 25 7d 26 24 f8 b4 55 7d 27 7d 22 7d 28 7d 22 54 79 7e fsm_sdata(LCP): Sent code 1,1,20.

LCP: sending Configure-Request, id 1

LCP: open state 2 (LS_CLOSED) -> 6 (LS_REQSENT)

pppStart: finished

System initialised

> 7e ff 7d 23 c0 21 7d 21 7d 21 7d 20 7d 2e 7d 22 7d 26 7d 20 7d 2a 7d 20 7d 20 7d 23 7d 24 c0 23 f3 4d 7e 7e ff 7d 23 c0

pppInProc[0]: got 40 bytes

pppInput[0]: LCP len=14

fsm_input(LCP):1,1,14

fsm_rconfreq(LCP): Rcvd id 1 state=6 (LS_REQSENT)

lcp_reqci:  ASYNCMAP=X PAP (C023)

lcp_reqci: returning CONFACK.

pppWrite[0]: len=35

7e ff 7d 23 c0 21 7d 22 7d 21 7d 20 7d 2e 7d 22 7d 26 7d 20 7d 2a 7d 20 7d 20 7d 23 7d 24 c0 23 cd ce 7e fsm_sdata(LCP): Sent code 2,1,14.

pppInput[0]: packet processed

21 7d 24 7d 21 7d 20 7d 2e 7d 25 7d 26 24 f8 b4 55 7d 27 7d 22 7d 28 7d 22 ad 7d 35 7e

pppInProc[0]: got 29 bytes

pppInput[0]: LCP len=14

fsm_input(LCP):4,1,14

fsm_rconfnakrej(LCP): Rcvd id 1 state=8 (LS_ACKSENT)

lcp_rejci: long opt 5 rejected

lcp_rejci: void opt 7 rejected

lcp_rejci: void opt 8 rejected

lcp_addci: L opt=2 0

pppWrite[0]: len=28

ff 7d 23 c0 21 7d 21 7d 22 7d 20 7d 2a 7d 22 7d 26 7d 20 7d 20 7d 20 7d 20 5f ad 7e fsm_sdata(LCP): Sent code 1,2,10.

LCP: sending Configure-Request, id 2

pppInput[0]: packet processed

7e ff 7d 23 c0 21 7d 22

pppInProc[0]: got 8 bytes

7d 22 7d 20 7d 2a 7d 22 7d 26 7d 20 7d 20 7d 20 7d 20 36 d9 7e

pppInProc[0]: got 21 bytes

pppInput[0]: LCP len=10

fsm_input(LCP):2,2,10

fsm_rconfack(LCP): Rcvd id 2 state=8 (LS_ACKSENT)

lcp_acki: Ack

ppp_send_config[0]: outACCM=0 0 a 0

ppp_recv_config[0]: inACCM=0 0 0 0

pppWrite[0]: len=16

7e ff 03 c0 21 09 00 00 08 00 00 00 00 bb 6e 7e fsm_sdata(LCP): Sent code 9,0,8.

link_established: unit 0; Lowering up all protocols...

IPCP: lowerup state 0 (LS_INITIAL) -> 2 (LS_CLOSED)

pppWrite[0]: len=36

ff 03 80 21 01 01 00 1c 03 06 00 00 00 00 02 06 00 2d 0f 00 81 06 00 00 00 00 83 06 00 00 00 00 7d 5e 84 7e fsm_sdata(IPCP): Sent code 1,1,28.

IPCP: sending Configure-Request, id 1

IPCP: open state 2 (LS_CLOSED) -> 6 (LS_REQSENT)

pppInput[0]: packet processed

7e ff 03 c0 21 0a 08 6b e4 7e

pppInProc[0]: got 10 bytes

pppInProc[0]: Dropping bad fcs 0x70d6 proto=0xc021

pppDrop: pbuf len=12, addr 2000509c

 

#>counters

------------------

Counters for port  :  0

 

Rx byte cnt ...: 0

Tx byte cnt ...: 0

Parity errors..: 0

Framing errors.: 0

Brakes ........: 0

Overrun errors.: 0

 

Counters for port  :  1

 

Rx byte cnt ...: 220

Tx byte cnt ...: 281

Parity errors..: 0

Framing errors.: 0

Brakes ........: 0

Overrun errors.: 0

 

Counters for port  :  2

 

Rx byte cnt ...: 0

Tx byte cnt ...: 0

Parity errors..: 0

Framing errors.: 0

Brakes ........: 0

Overrun errors.: 0

 

 

Mehmet Ali Ekici