[En-Nut-Discussion] HDLC in charcter mode?

Hendrik Osenberg hendrik.osenberg at web.de
Mon Apr 11 20:17:54 CEST 2011

Hello everyone,

i have a problem with the AT91 AHDLC Driver.
At first i want to use it as a normal uart in order to configure a bluetooth-module by sending hex-values. After receiving the correct answers, I want to start a PPP-session...
I have a working PPP-Connection and i can send Data from my board, by the way it is an OLIMEX SAM7-EX256, via a mobile phone. But to do this i have set up the bluetooth connection with another program which makes use of the normal uart1-driver. After this was successful i have to flash the board with the Code which I use the Ahdlc1 driver. In two older threads I read about   _ioctl(pppcom, HDLC_SETIFNET, 0);, but this does not work. If I try to change in raw mode it ends up in a freezing CPU.
Here is a part of the example:

int pppcom;
unsigned long baud = 9600;
char transparent[] = {0x02,0x52,0x01,0x00,0x64,0x01,0x03};
int lctl = 1000;

NutRegisterDevice(&devAhdlc1, 0, 0);
NutRegisterDevice(&devPpp, 0, 0);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);

pppcom= _open("ppp:uart1/user/pass",_O_RDWR | _O_BINARY);
if (pppcom <= 0)

_ioctl(pppcom, UART_SETSPEED, &baud);
_ioctl(pppcom, UART_SETREADTIMEOUT, &lctl);
_ioctl(pppcom, HDLC_SETIFNET, 0);


Does this feature misses in this driver? But in which way is NutChat working? It is in character mode too, isn't it?
What am I doing wrong? Are there any hints?
Any help is welcome!

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