Sorry, I say "just", but Peter posted that link like a week or slightly longer. Ago.
On Fri, Jul 24, 2015 at 2:51 PM, William Hermans <[email protected]> wrote: > *Is there someway of putting in a custom baud divisor in c code ideally? * > > > Yes. Peter Hurdley just posted a link to some code to do exactly that on > the forums here. The subject title was Portuguese( I think ), so should > stand out if you search Peter's name, and sort by date. > > On Fri, Jul 24, 2015 at 11:15 AM, <[email protected]> wrote: > >> Hi I'm trying to set a MIDI connection through serial port 4 >> >> echo something > /dev/ttyO4 >> works if I select one of the baud rates defined in termios.h (say 38400) >> but doesn't work for 31250 (the MIDI baud rate). >> >> I have flashed to 4.1 (uname -r == 4.1.2-ti-r4) and can get a 500k Baud >> serial port from another UART. With the idea that setting a divisor would >> work out to the desired BAUD if I could set a divisor of 16. I have another >> UART that needs to run at 1 MBaud. >> >> Is there someway of putting in a custom baud divisor in c code ideally? >> >> This is where I am at: >> >> void initializeBBB() { >> FILE *uartFileManager; >> //UART config using termios >> struct termios midiTermios, picTermios, tempTermios; >> >> midiDevice = open( "/dev/ttyO4", O_RDWR | O_NOCTTY ); >> if ( midiDevice < 0 ) { >> printf("Error: MIDI connection failed to open"); >> } >> >> tcgetattr( midiDevice, &tempTermios ); >> bzero( &midiTermios, sizeof( midiTermios ) ); >> midiTermios.c_cflag = B500000 | CS8 | CLOCAL | CREAD; >> midiTermios.c_iflag = IGNPAR | ICRNL; >> midiTermios.c_oflag = 0; >> midiTermios.c_lflag = 0; >> >> midiTermios.c_cc[VTIME] = 0; >> midiTermios.c_cc[VMIN] = 1; >> >> tcflush( midiDevice, TCIFLUSH ); >> tcsetattr( midiDevice, TCSANOW, &midiTermios ); >> } >> >> which will initialize ttyO4 to 500000 Baud. Placing in: >> cfsetispeed(&midiTermios, 31250); >> cfsetospeed(&midiTermios, 31250); >> cfmakeraw(&midiTermios); >> >> before tcsetattr did not accomplish setting. >> >> midiTermios.c_ispeed = 31250; >> midiTermios.c_ospeed = 31250; >> >> also didn't work. Are there ioctl commands available on the BBB? Any help >> that doesn't make me use a MIDI --> USB cable and connect that way would be >> appreciated. I would really like to not have to recompile the kernel. >> >> Thanks, >> >> j >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
