Re: AT91SAM9260 async UART

[Peter Teoh <htmldeveloper@xxxxxxxxx>]

On Wed, Nov 11, 2009 at 6:05 AM, J.H.Kim <frog1120@xxxxxxxxx> wrote:

Hi, everyone

I'm tyring to implement blocking UART.
I just do "open("/dev/ttyS1", O_RDWR);
But the read function does not blocked when there is no input data.
It acts like asynchronous UART.

How can I implement blocking UART with AT91SAM9260?

so is my ttyS1, because the hardware does not exists:

First, using dmesg, see what has been initialized:

    420 [    2.279365] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    421 [    2.280126] 00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    422 [    2.283205] brd: module loaded

so cat /dev/ttyS0 worked - it will block.

but:

>cat /dev/ttyS1
cat: /dev/ttyS1: Input/output error

not sure if this helped?
 

Thanks in advance

Best Regards,
J.Hwan.Kim

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Regards,
Peter Teoh