Hi,
when I change the CCD_FRAME settings of my QHY5-II cam with "unsupported" frame size settings (by accidentally choosing wrong subframe settings) , then the driver does not respond with some error messages but simply becomes unresponsive. I cant see a crash but the driver hangs in "GetQHYCCDSingleFrame".
For example frame size 32 pixel with 500 px offset in x-y is working, but the same settings with frame size 16 not. I am wondering how a client can determine which subframes are allowed and which not ...

The driver is running on a raspberrypi 2 with ubunutu mate 16.04 LTS.

Thanks,
Klaus

Blocking ================================
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Final binned (1x1) image area is (500, 500), (16, 16)
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Current exposure time is 100000.000000 us
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDBinMode (1x1).
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDResolution camroix 500 camroiy 500 camroiwidth 16 camroiheight 16
2018-06-17T11:38:46: QHY CCD QHY5II-M-1037db: [DEBUG] Taking a 0.1 seconds frame...
2018-06-17T11:38:47: QHY CCD QHY5II-M-1037db: [DEBUG] Exposure done, downloading image...
2018-06-17T11:38:47: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call.

Not-Blocking ==========================================================================
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Final binned (1x1) image area is (500, 500), (32, 32)
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Current exposure time is 100000.000000 us
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDBinMode (1x1).
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] SetQHYCCDResolution camroix 500 camroiy 500 camroiwidth 32 camroiheight 32
2018-06-17T11:27:45: QHY CCD QHY5II-M-1037db: [DEBUG] Taking a 0.1 seconds frame...
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Exposure done, downloading image...
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call.
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Blocking read call finished.
2018-06-17T11:27:46: QHY CCD QHY5II-M-1037db: [DEBUG] Download complete.

Hi,
this is not an INDI issuer per se, but more an issue of the QHY SDK library. Do we have contact to the QHY SDK developers?

Thanks,
Klaus

I'll forward this to QHY, thanks for report.