# start_offset of 1 can help if triggering on oscilloscope # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # copies or substantial portions of the Software. # The above copyright notice and this permission notice shall be included in all # furnished to do so, subject to the following conditions: # copies of the Software, and to permit persons to whom the Software is # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # in the Software without restriction, including without limitation the rights # of this software and associated documentation files (the 'Software'), to deal # Permission is hereby granted, free of charge, to any person obtaining a copy This is Python code not intended for running on a microcontroller board. '''Convert a list of png images to pseudo composite video in wav file form. This technique is likely to work well on an old CRO but the vertical lines will be too prominent on a DSO.Ĭopy Code # SPDX-FileCopyrightText: 2019 Kevin J. This is, in effect, a crude form of composite video. A large sync pulse can be added to allow the oscilloscope to trigger (start) the horizontal scan. This is far higher than the rate required for audio but still within the capabilities of the SAMD21/SAMD51 chips. If the frame rate is 60Hz and the image is 50x40 pixels then the DAC needs to output samples at 60*50*40 = 120 kilosamples-per-second (ksps or kHz).

This technique only allows one pixel per column to be displayed as the beam scans from left to right, multiple scans need to be used to create a complete image. If the slew rate is high enough the vertical transitions will be barely visible on a CRO.

To draw an on-pixel, the DAC can be set to a value on-screen, if a pixel is not on then the DAC can be set of a value off-screen. A low-resolution image can be formed by allowing the normal timebase to control the beam horizontally and using the DAC to control the vertical position.

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