Hello!
I'm having an issue with using UART1 in c. I've shorted the TX and RX pins
and I can echo back a series of two bytes I send from write. I'm using the
non-canonical code given on this page
<http://www.tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html>. Everything
works great the first two times I do this while running the program, but
the third time the BBB hangs during the read command. Anyone have any idea
what to do about this? Here's the relevant parts of my code below,
void SERIAL_Init(void)
{
/*******************************************************************/
printf("\tSerial Port Initialization ...");
SERIAL_fd = open(MODEMDEVICE,O_RDWR | O_NOCTTY /*| O_NDELAY*/);
if (SERIAL_fd < 0)
{ perror(MODEMDEVICE);
exit(-1);
}
fcntl(SERIAL_fd,F_SETFL,0);
tcgetattr(SERIAL_fd,&newtio);
newtio.c_cflag |= CS8 | CLOCAL | CREAD ;
cfsetispeed(&newtio,BAUDRATE);
cfsetospeed(&newtio,BAUDRATE);
newtio.c_iflag = IGNBRK | IGNPAR;
newtio.c_oflag = 0;
newtio.c_lflag = 0;
newtio.c_cc[VTIME]=0; /* inter-character timer unused */
newtio.c_cc[VMIN]=31; /* blocking read until 18 chars
received */
tcflush(SERIAL_fd,TCIFLUSH);
tcsetattr(SERIAL_fd,TCSANOW,&newtio);
/****************************************************************/
printf("Done\n");
return;
}
unsigned char test_data[2] = {0x00,0x00};
unsigned char read_command[2][2] = {
{0x1a,0x2b},
{0x90,0x05},
};
while(readTest == 0)
{
printf("Enter 0 to read from maestro pin, 1 to continue with testing\n");
scanf("%d",&readTest);
write(SERIAL_fd,read_command[0],2);
printf("Wrote values...\n");
num_bytes = read(SERIAL_fd,&test_data,2);
printf("Value read: %x %x\n",test_data[0],test_data[1]);
}
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