Serial Port Bug?
k5di at zianet.com
Wed Nov 28 19:51:46 UTC 2007
Tod Merley wrote:
> On Nov 27, 2007 7:48 AM, Karl Larsen <k5di at zianet.com> wrote:
>> I have a software I like to use called gmfsk which uses the serial
>> port to turn on and off the transmitter in my radio. It worked fine on
>> my old computer. Now when I try to run gmfsk it puts up an error panel
>> that says "Not a serial or parallel port". This made me think the new
>> computer which has a serial port that is not working.
>> With a volt meter I find some pins have a constant -10.7 volts on
>> them which is the standard RS-232 for a no-data signal. In this static
>> measure the voltmeter sees no positive volts near +12 volts.
>> Wanting a way to test the serial port I recalled minicom and after
>> getting it set up on /dev/ttyS0 it seems happy with Com 1. The old
>> /dev/modem is gone on F7. But now what is a way to drive the serial port
>> pins to a constant plus voltage with minicom?
>> I have a scope that I can use if there are no way to make a constant
>> positive voltage. My fear is that the serial port is broken and can't
>> make a positive voltage.
>> Karl F. Larsen, AKA K5DI
>> Linux User
>> #450462 http://counter.li.org.
>> fedora-list mailing list
>> fedora-list at redhat.com
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> Hi Karl F. Larsen!
> What I like to do with dmesg is #dmesg > dmesg.txt and then call - say
> Abiword to actually paw through the file. Searching in Abiword for
> "serial" I found these three lines together:
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
> pnp: Device 00:0c activated.
> 00:0c: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> Looking a bit at the SW you like to use I see that it uses hamlib to
> control the rig. The error message may well indicate that the hamlib
> you have compiled talks to a port whose SW interface (e.g. - at I/O
> 0x3f8 (irq = 4)) ls located elseware..
> That is my guess.
> Good Hunting!
Hi Tod all I get is this:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
Nothing about being set up in dmesg. It appears the kernel correctly
sees the driver. But for some reason it is not turned on.
Karl F. Larsen, AKA K5DI
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