How fast is you data transmission? Are you using the serial API calls?
-----Original Message-----
From: Oliver King-Smith <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Tuesday, August 24, 1999 12:12 PM
Subject: Re: HotSync signal
>Dave,
>
>To clarify a few points
>
>1) I make no OS calls in my code while I am receiving the serial data. So
>the processing is occurring when the modem HotSync line is triggered.
>Presumably the Palm OS kernel is monitoring these lines, and they generate
>an IRQ when they arrive.
>2) Because the data is not RS232 the UART buffers are not been used. This
>is unfortunate because as you mentioned the UART can run asynchronously to
>the rest of the processor. But in this case there is no data going into
>the UART.
>
>Oliver
>
>At 09:51 AM 8/24/99 -0400, you wrote:
>>Oliver
>>Have you tried masking out the hotsync char while you are processing the
>>first. If the problem is the second hotsync char is being generated
before
>>the OS gets to process it, you can use the same technique as if you were
>>masking out one of the hardware buttons (short-stop the OS and handle the
>>key yourself, or ignore it). If the problem is the hardware stopping to
>>service the interrupt generated by the key being press and placing the
char
>>on the even queue, I don't know what can be done
>>
>>>2) When the HotSync signal is triggered, the Palm OS kernel spends so
much
>>>time processing the signal, I miss a large chunk of the data coming in.
>>I found I typically don't loose data to interrupts since the UART buffers
>>incoming chars even if the processor is busy. Are you using a control
line
>>to read data?
>>
>>-----Original Message-----
>>From: Oliver King-Smith <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>>Date: Tuesday, August 24, 1999 3:33 AM
>>Subject: HotSync signal
>>
>>
>>>My application uses the HotSync Signal to initiate a read from an
external
>>>device. This works fine in most cases, but one particular device sends a
>>>second HotSync signal after the read has begun.
>>>
>>>This has two unfortunate side effects.
>>>1) The program attempts to read a second value from the external device
>>>after it has completed the first read (This is solvable with a UI switch,
>>>although I would prefer to keep it hidden from the user).
>>>2) When the HotSync signal is triggered, the Palm OS kernel spends so
much
>>>time processing the signal, I miss a large chunk of the data coming in.
>>>
>>>These problems all go away by turning off interrupts, but "everyone" says
>>>don't turn off interrupts otherwise your cat will go blind, etc. So does
>>>anyone have a suggestion on how to prevent the aforementioned problems.
>>>
>>>Other relevant facts to consider when proposing solutions
>>>a) The external hardware is designed by other companies, so redesigning
it
>>>is not an option.
>>>b) I can not use the UART, since the data is not RS232 compatible (i.e.
no
>>>start or stop bits, and no frame information).
>>>
>>>Thanks in advance
>>>
>>>Oliver King-Smith
>>>
>>>
>>>
>>
>
>
