OSError: exception: access violation reading 0x00000142C7D01640 when using bulk mode with downsampling enabled

andreasjung · Post by **andreasjung** » Thu Aug 17, 2023 7:43 am

I have this Python code (latest picosdk, Python 3.11, Picoscope 5444A) for reading data in bulk mode.
This code works:

        self._device_status["GetValuesBulk"] = ps.ps5000aGetValuesBulk(
            self._device_handle,
            ctypes.byref(c_maxSamples),
            0,
            (self._number_of_captures - 1),
            0,
            0,
            ctypes.byref(overflow),
        )

I tried to play with the downsampling functionality (AVERAGE) by changing the code to:

Code: Select all

        self._device_status["GetValuesBulk"] = ps.ps5000aGetValuesBulk(
            self._device_handle,
            ctypes.byref(c_maxSamples),
            0,
            (self._number_of_captures - 1),
            1, # Downsampling RADIO
            4, # AVERAGE
            ctypes.byref(overflow),
        )

This gives me an error

Code: Select all

OSError: exception: access violation reading 0x00000142C7D01640

What could be the problem?

Post by **Martyn** » Wed Aug 23, 2023 9:11 am

Have you added average ratio mode memory buffers using ps.ps5000aSetDataBuffers or ps.ps5000aSetDataBuffer

Test & Measurement Forum

OSError: exception: access violation reading 0x00000142C7D01640 when using bulk mode with downsampling enabled

OSError: exception: access violation reading 0x00000142C7D01640 when using bulk mode with downsampling enabled

Re: OSError: exception: access violation reading 0x00000142C7D01640 when using bulk mode with downsampling enabled