Dear all,
I have gone through quiet a few post listed here under UART, but still I
have not been able to enable my UART, I have done the following:
1) I am using 3.8.13-bone50 #1 SMP on Debian 7.5, its the default image
without any changes. But still when I change uEnv to enable UART it just
doesn't enable. it just show ttyO0 and ttyO1.
Changes I made in uEnv were: cape_enable=capemgr.enable_partno=BB-UART1,
BB-UART2, BB-UART4, BB-UART5
2) On one post here it was also mentioned that a different driver (from
Omap) links the serial port to tty"S" so I also tried running a serial
loopback program (attached) to no success.
I am sorry for bugging you all with such a trivial matter, I know it is
something very simple that I am missing, but somehow I am not able to find
what that is.
So, need some expert experienced eyes to spot the mistake. :)
Thank you.
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/*
* uart-loopback.c - userspace uart loopback test
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <termios.h>
#include <sys/ioctl.h>
void print_usage(char *prg)
{
fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
fprintf(stderr, "Options: -b <baud> (uart baud rate)\n");
fprintf(stderr, "Options: -c <count> (ascii count)\n");
fprintf(stderr, " -? (show this help)\n");
fprintf(stderr, "\nExample:\n");
fprintf(stderr, "uart-loopback /dev/ttyS1\n");
fprintf(stderr, "\n");
exit(1);
}
int main(int argc, char **argv)
{
fd_set readfs; /* file descriptor set */
struct timeval Timeout;
int fd,ret;
char *tty;
char j[2];
char *btr = NULL;
int opt,count=127;
char i;
while ((opt = getopt(argc, argv, "bc:?")) != -1) {
switch (opt) {
case 'b':
btr = optarg;
printf("baud=%s\n",btr);
break;
case 'c':
count = atoi(optarg);
break;
case '?':
default:
print_usage(argv[0]);
break;
}
}
if (argc - optind != 1)
print_usage(argv[0]);
tty = argv[optind];
printf("count=%d\n",count);
printf("uart port used: %s\n",tty);
if ((fd = open (tty, O_RDWR | O_NOCTTY)) < 0) {
perror(tty);
exit(1);
}
tcflush(fd, TCIFLUSH);
for (i=48; i < count+48; i++) {
/* ret=write(fd,&i, 1);
if (ret != 1) {
printf("write error!\n");
exit(1);
}
*/ FD_SET(fd, &readfs); /* set testing source */
/* set timeout value within input loop */
Timeout.tv_usec = 0; /* milliseconds */
Timeout.tv_sec = 10; /* seconds */
ret = select(fd+1, &readfs, NULL, NULL, &Timeout);
if (ret==0){
printf("read timeout error!\n");
exit(1);
}
else
ret=read(fd, &j, 1);
if (ret!=1) {
printf("read error!\n");
exit(1);
}
if ( i!=j[0] ) {
printf("read data error: wrote 0x%x read 0x%x\n",i,j[0]);
exit(1);
}
printf("%c",j[0]);
}
printf("\n");
close(fd);
return 0;
}
