RE: [ts-7000] Re: None of the serial port s are detected.

["Jegan Bose Vincent" <>]

Thanks. I tried all possibilities and suggestions discussed in the forum
related to the serial ports in TS-7800, ultimately I end up writing a simple
native C application which is working perfectly ok with 2 other ARM boards,
X86, 86-64, etc. When I debugged using the native gdb supplied in BSP (I
love this feature), the program is hanging for ever in the C read(FD,
buffer, length) library call. Here is a tailored version of my application,
any suggestion is greatly appreciated. Time is running out on my end, I need
to make a suggestion to the bosses on the board selection.

::open("/dev/ttyS1", O_RDWR | O_NOCTTY | O_NDELAY );

//I tried this too
//::open("/dev/ttyS1", O_RDWR | O_NOCTTY | O_NONBLOCK ); 

//I tried this too
//::open("/dev/ttyS1", O_RDWR | O_NOCTTY | O_NONBLOCK | O_NDELAY); 

And I tried many combinations.

int ReadData(char* buffer, unsigned int length)
{
        if(m_fd < 0){
                __MESSAGE("Port not open for reading\n","");
                return -1;
        }

        int bytesRead = ::read(m_fd, buffer, length);
        if( bytesRead < 0 ){
                __MESSAGE("No data read: %s\n", bytesRead);
                buffer[0] = '\0';
        }else{
                buffer[bytesRead] = '\0';
        }
        
        return bytesRead;
}

int WriteData(const char* buffer, unsigned int length)
{

        if(m_fd < 0){
                __MESSAGE("Port not open for writing\n", "");
                return -1;
        }

        return ::write(m_fd, buffer, length);
}

________________________________________
From:   On Behalf Of
naturalwatt
Sent: Thursday, July 24, 2008 4:39 AM
To: 
Subject: [ts-7000] Re: None of the serial port s are detected.

--- In  Frank <> wrote:
>
> Best guess is the ports are being held open by getty. By default, ttyS0 
> and ttyS1 are grabbed by the getty process. getty is what gives you the 
> serial port terminal access (if needed). With a null modem cable you 
> could use something like Windows HyperTerm to log onto your 7800.
> 
> In your /etc/inittab file, you will see these two lines about 2/3 down:
> 
> # By default, run gettys on both serial ports
> T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
> T1:23:respawn:/sbin/getty -L ttyS1 115200 vt100
> 
> To gain access to ttyS1, as root, edit this file and comment out the 
> 'T1' entry:
> 
> # By default, run gettys on both serial ports
> T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
> # T1:23:respawn:/sbin/getty -L ttyS1 115200 vt100
> 
> Save the file, reboot, and you should be all set.
> 
You don't need to reboot after editting inittab. just type init q.
 


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