Hi Peter,
Thanks for ur reply. Here some piece of code that i developed to make
use of UART0, still i am facing problem in using uart at Baudrate
115200.Here i am attaching piece of code for ur reference. PLz review
code and let me know any mistake.
int OpenSerialPort ( PortNumber_t pnPortNumber, BaudRate_t bdBaudRate )
{
int ret;
int rReturnVal = 0;
char serialDev[30] ;
//here pnPortNumber is 1 means i try to open /dev/tts/0
sprintf (serialDev,"/dev/tts/%d", pnPortNumber - 1 );
if ( (fd = open(serialDev, O_RDWR)) < 0)
{
perror ("open failed");
fprintf(stderr, "Opening of dev %s failed.\n", serialDev);
rReturnVal = SERIAL_PORT_OPEN_FAILED;
return (rReturnVal);
}
tcflush(fd, TCIFLUSH);
ret = tcgetattr(fd, &save);
if ( ret == -1)
{
perror("tcgetattr");
rReturnVal = SERIAL_PORT_OPEN_FAILED;
return (rReturnVal);
}
Initialize_serial(fd, bdBaudRate);
}
int Initialize_serial(int fd, BaudRate_t bdBaudRate)
{
struct termios tmp;
speed_t speed = B115200;
if ( tcgetattr(fd, &tmp) == -1)
{
fprintf(stderr, "Getting terminal default settings failed !\n");
return (-1);
}
switch (bdBaudRate)
{
case 9600:
speed = B9600;
break;
case 57600:
speed = B57600;
break;
case 115200:
speed = B115200;
break;
case 921600:
speed = B921600;
break;
default:
speed = B115200;
break;
}
tmp.c_iflag &= ~(IGNBRK | IXANY | IUCLC | INLCR | ICRNL | ISTRIP \
| IXON | BRKINT);^M
tmp.c_oflag &= ~OPOST;
tmp.c_cflag &= ~CSIZE;
tmp.c_cflag |= CREAD;
tmp.c_cflag |= CS8;
tmp.c_lflag &= ~ (ICANON |ISIG | ECHO | IEXTEN);
tmp.c_cc[VMIN] = 1;
tmp.c_cc[VTIME] = 0;
cfsetispeed(&tmp, speed);
cfsetospeed(&tmp, speed);
if (tcsetattr(fd, TCSANOW, &tmp)!= 0)
{
fprintf(stderr, "Setting terminal properties failed !\n");
}
return 0;
}
and i am reading uart data using read sys call( read(fd, buffer,
(size_t) 1);) and writing data using write sys call write (fd, (char
*)ucpDataBuffer, txSize);. During read operation I am not receiving
proper data. Is there any UART settings need to be changed Please
help me on this.
Regards,
Subhash B Karigar
----- Original Message -----
From: "Peter Wippich" <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>
To: "Subhash" <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
Cc: <[email protected]
<mailto:[email protected]>>
Sent: Thursday, March 22, 2007 8:07 PM
Subject: Re: UART0 help
>
> man 2 open
> man 2 read
> man 2 write
> man termios
>
> ...........
>
> Can't resist,
>
> Peter
>
> On Thu, 22 Mar 2007, Subhash wrote:
>
> > Hi All,
> >
> > I want to make use of UART0 in my application, is there a source
code is available already? And also I want to know what is the
maximum baudrate this uart supports... can we go higher baudrate like
921kbps?. PLease can any one help me on this...
> >
> > Regards,
> >
> > Subhash B Karigar
> >
>
>
> | Peter Wippich Voice: +49 30
46776411 |
> | G&W Instruments GmbH fax: +49 30
46776419 |
> | Gustav-Meyer-Allee 25, Geb. 12 Email:
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> |
> | D-13355 Berlin /
Germany |
>
>
>
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