Looking further, it is failing on the tcgetattr, which in turn fails the setattr.
The test code is:
/* simple test of each of the 8 serial ports on the TS7800
* John Donoghue <>
* 18 Dec 2007
*/
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
/*------------------------------------------------------------*/
FILE * UART_init(uint8_t port, uint32_t baudrate)
{
int hCom = -1;
struct termios options;
char buffer[100];
switch(baudrate)
{
case 50:
baudrate = B50;
break;
case 75:
baudrate = B75;
break;
case 110:
baudrate = B110;
break;
case 134:
baudrate = B134;
break;
case 150:
baudrate = B150;
break;
case 200:
baudrate = B200;
break;
case 300:
baudrate = B300;
break;
case 600:
baudrate = B600;
break;
case 1200:
baudrate = B1200;
break;
case 1800:
baudrate = B1800;
break;
case 4800:
baudrate = B2400;
break;
case 9600:
baudrate = B9600;
break;
case 19200:
baudrate = B19200;
break;
case 38400:
baudrate = B38400;
break;
case 57600:
baudrate = B57600;
break;
case 115200:
baudrate = B115200;
break;
case 230400:
baudrate = B230400;
break;
default:
baudrate = B38400;
break;
}
sprintf(buffer,"/dev/ttyS%d", (port));
printf("try open %d : '%s'\r\n", (int)port, buffer);
hCom = open(buffer, O_RDWR | O_NOCTTY /*| O_NDELAY*/);
if (hCom < 0)
{
fprintf(stderr,"OpenSerial: Couldnt open %s:", buffer);
fflush(stderr);
perror(NULL);
return NULL;
}
/* save current serial port settings */
if(tcgetattr(hCom,&options) != 0)
{
perror("OpenSerial: tcgetattr: ");
}
cfsetispeed(&options, baudrate);
cfsetospeed(&options, baudrate);
options.c_cflag &= ~PARENB; /* no parity */
options.c_cflag &= ~CSTOPB; /* 1 stop bit */
options.c_cflag &= ~CSIZE; /* mask out all size bits */
options.c_cflag |= CS8; /* 8 bits */
options.c_cflag |= (CLOCAL | CREAD); /* enable recieve and local control*/
options.c_iflag &= ~CRTSCTS; /* No RTS/CTS */
options.c_iflag &= ~(IXON | IXOFF | IXANY); /* No Xon/Xoff */
options.c_oflag &= ~OPOST; /* no output processing */
options.c_oflag &= ~ONLCR; /* dont convert linefeeds */
options.c_lflag &= ~(ICANON|ECHOE|ECHO|ISIG); /* not line oriented */
options.c_cc[VTIME] = 1000;
options.c_cc[VMIN] = 1; /* dont wait for a byte */
tcflush(hCom, TCIFLUSH);
if(tcsetattr(hCom,TCSANOW,&options)!=0)
{
perror("OpenSerial: tcsetattr");
close(hCom);
return NULL;
}
return fdopen(hCom, "r+");
}
/*------------------------------------------------------------*/
int main()
{
int i;
FILE * com;
for(i=0;i<10;i++)
{
sleep(1);
printf("Open port %d \r\n", i);
com = UART_init(i, 9600);
if(com)
{
fprintf(com, "Com port %d\r\n", i);
fflush(com);
fclose(com);
}
}
return 0;
}
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