Re: [ts-7000] Re: Missing characters in Serial I/P

["Donal O'Connor" <>]

Hi Guys,

I am really sorry about the delay back, so busy with other college stuff and I got a bit sick there for a while.

I am still experiencing this problem with the serial I/O.

I have:

 - Moved to NAND flash
 - Set the thread priority of the serial comm to time critical (QT)

I am still getting the problem where I miss a character, the important one '>'

I don't know if this is a problem of my own programming but since it works perfectly on my desktop machine, something has to be up.

I have download the Serial testing program at: http://www.turbocontrol.com/simpleserial.htm

I run the DlpTempGSim program on my x86 development machine on (/dev/ttyUSB0) where my usb->serial converter plugged in.

I then have a null modem cable to my ARM device which is connected to another usb->serial converter at same address, /dev/ttyUSB0.

I run the DlpTempG program on this and I get interesting results.

Output from Simulator on my development machine:

:~/Desktop/Downloads/serialtestx86$ ./DlpTempGSim

Ports available:  ttyS3 ttyS2 ttyS1 ttyS0 ttyUSB0

*** Press Ctrl-C to stop ***

24-3-09 17:23:19   sent response
24-3-09 17:23:20   sent response
An unhandled exception occurred at $08062F2D :
ESynaSerError : Communication error 9997: Timeout during operation
  $08062F2D
  $080612B4
  $0806136D
  $08048225

Output from the program on the ts7390:

:~/Desktop/Downloads/serialtestx86$ ./DlpTempGSim

Ports available:  ttyS3 ttyS2 ttyS1 ttyS0 ttyUSB0

*** Press Ctrl-C to stop ***

24-3-09 17:23:19   sent response
24-3-09 17:23:20   sent response
An unhandled exception occurred at $08062F2D :
ESynaSerError : Communication error 9997: Timeout during operation
  $08062F2D
  $080612B4
  $0806136D
  $08048225


Now the two of them seem to be communicating but after a few seconds it crashes.


Anyone have any ideas or pointers? - Should I try another driver? If so which one.

Hope someone can help.

Thanks very much.

Regards,
Donal

On Wed, Feb 25, 2009 at 1:16 PM, Matthew Harrell <> wrote:

> From working on a 2.6.27 port of the SD card stuff, I've found a couple
> bugs in the sdcard driver (and I know that a few remain). The one
> you're experiencing is due to the fact that the driver enters atomic
> mode (unnecessarily) while transferring data to/from the sdcard.
>
> Even when I release the atomic mode, the sdcard performance is about
> 87k/second on a ts7400 and requires 100% cpu load, even after I got rid
> of the while (!(DMA_READ(STATUS) & 0x40)) ; busy wait.
>
> What is more interesting is that their 2.4 driver does about 1.3
> megabytes per second running under linux 2.4.

Interesting. Does this problem occur only when you're writing to the
card or does it also happen periodically when the system writes something
to the card?

Do you have a version of your driver I can experiment with?

--
Matthew Harrell Another Month's End:
Bit Twiddlers, Inc. All Targets Met
mharrell%40bittwiddlers.com All Systems Working
All Customers Satisfied
All Staff Enthusiastic
All Pigs Fed And Ready To Fly

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