From: 赵振国 <zhenguo6858@gmail.com>
To: 赵振国 <zhenguo6858@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] tty: n_gsm: CR bit value should be 0 when config "initiator=0"
Date: Wed, 7 Jul 2021 14:08:40 +0800 [thread overview]
Message-ID: <CAGGV+3L+VgU75kKt30EoThQ3yhyfFDhkEvoK9N-hAQrv8XxiUA@mail.gmail.com> (raw)
In-Reply-To: <CAGGV+3LgLdohhYhH+qJTokeNU_WdV9oRNHMc9a_5YTTVA3U8ow@mail.gmail.com>
Dear Jiri,Greg
1: our development board uses linux kernel , uart dev node is "/dev/ttyGS2"
2: config uart "/dev/ttyGS2" ,we use ngsm ldisc,and config
"c.initiator = 0;" code is as follows
#include <stdio.h>
#include <stdint.h>
#include <linux/gsmmux.h>
#include <linux/tty.h>
#define DEFAULT_SPEED B115200
#define SERIAL_PORT /dev/ttyGS2
int ldisc = N_GSM0710;
struct gsm_config c;
struct termios configuration;
uint32_t first;
/* open the serial port */
fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
/* configure the serial port : speed, flow control ... */
/* use n_gsm line discipline */
ioctl(fd, TIOCSETD, &ldisc);
/* get n_gsm configuration */
ioctl(fd, GSMIOC_GETCONF, &c);
/* we are responter and need encoding 0 (basic) */
c.initiator = 0;
c.encapsulation = 0;
/* our modem defaults to a maximum size of 127 bytes */
c.mru = 127;
c.mtu = 127;
/* set the new configuration */
ioctl(fd, GSMIOC_SETCONF, &c);
/* get first gsmtty device node */
ioctl(fd, GSMIOC_GETFIRST, &first);
printf("first muxed line: /dev/gsmtty%i\n", first);
/* and wait for ever to keep the line discipline enabled */
daemon(0,0);
pause();
3: connect to ubuntu by uart serial port cable,ubuntu uart dev node
is /"dev/ttyUSB0"
send DLC0 SABM command by "/dev/ttyUSB0",but linux development board
can't response,code is as follows
int main(int argc, char **argv)
{
int fd;
fd = open("/dev/ttyUSB0,O_RDWR | O_NOCTTY | O_NDELAY);
char buf[256]={0xf9,0x03,0x3f,0x01,0x1c,0xf9};
write(fd,buf,6);
close(fd);
}
4: linux development board receive data,by uart,gsm_queue will check
CR,find CR=1.so go to invalid,pls check again.
static void gsm_queue(struct gsm_mux *gsm)
{
cr ^= 1 - gsm->initiator; /* Flip so 1 always means command */
dlci = gsm->dlci[address];
switch (gsm->control) {
case SABM|PF:
if (cr == 0)
goto invalid;
if (dlci == NULL)
dlci = gsm_dlci_alloc(gsm, address);
if (dlci == NULL)
return;
if (dlci->dead)
gsm_response(gsm, address, DM);
else {
gsm_response(gsm, address, UA);
gsm_dlci_open(dlci);
}
break;
next prev parent reply other threads:[~2021-07-07 6:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 11:53 [PATCH v2] tty: n_gsm: CR bit value should be 0 when config "initiator=0" Zhenguo Zhao
2021-06-24 12:58 ` Greg KH
[not found] ` <CAGGV+3LgLdohhYhH+qJTokeNU_WdV9oRNHMc9a_5YTTVA3U8ow@mail.gmail.com>
2021-07-07 6:08 ` 赵振国 [this message]
2021-07-07 6:10 ` Greg KH
2021-07-07 6:12 ` 赵振国
2021-07-15 2:29 ` 赵振国
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