At Mon, 22 Jul 2019 00:16:58 -0700 (PDT) [email protected] wrote:
>
>
>
>
> Hi,
>
> i am trying with c program for Uart peripheral like this :
> #include<termios.h>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <errno.h>
> #include <stdio.h>
> #include<stdlib.h>
>
> void main (void)
> {
> int file;
> char buf[20];
> size_t nbytes;
> ssize_t bytes_written;
> struct termios oldtio, newtio;
>
>
> if ((file = open("/dev/ttyS1", O_RDWR | O_NOCTTY))<0)
> {
> printf("UART: Failed to open the file.\n");
> return;
> }
>
>
> //save the current serial settings
> tcgetattr(file, &oldtio);
>
> //clear the structure for new port settings
> bzero(&newtio, sizeof(newtio));
>
> newtio.c_cflag = B9600 | CS8 | CREAD | CLOCAL;
> newtio.c_iflag = IGNPAR | ICRNL;
>
> tcflush(file, TCIFLUSH);
> tcsetattr(file, TCSANOW, &newtio);
>
> strcpy(buf, "This is a test\n");
> nbytes = strlen(buf);
>
> while (1)
> {
> bytes_written = write(file, buf, nbytes);
> sleep(10);
> }
> close(file);
>
>
> }
> i am running the code in to one terminal using ./uart1.0 and checking the
> output into one more terminal using
>
> debian@beaglebone:~$ minicom -D /dev/ttyO1 -b 9600
>
> minicom is opening but not able to see the data, here i not did any
> hardware connection on board.
OK you can't open the *same* serial port with two programs and see what is
sent by one with the other.
>
> what is problem , where is the mistake please tell me...
>
> suggest me any hardware connections i need to connect..
Go back to your earlier set up and cross-wire the pins for UART1 and UART2 and
open minicom on /dev/ttyO2.
>
>
--
Robert Heller -- 978-544-6933
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