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Jeff Epler af674d5a44 _set_size_and_colorspace: Boost pixel clock 
Limor noticed that the pixel clock was very low, leading to a frame rate
of just 7.6Hz from the camera.  Because the structure of the parallel
capture driver means dropping at least half of all frames, this led to
a really low LCD refresh rate of just 3.8Hz.

Bump the PLL multiplier for non-JPEG modes from 8 to 32.  This gives
a capture framerate of about 30FPS and an LCD refresh rate of about 15Hz.

Going significantly higher (multiplier 48) gives a jumbled display, but even
going slightly higher doesn't have a big effect on frame rate because the total
LCD data transmission time of about 30ms starts to overlap with the next frame.
Increasing the multiplier to 40 increases the capture frame rate to 40Hz but
the LCD refresh rate decreaseds to just 13Hz, because only 1/3 of captured
frames are displayed instead of 1/2.  This is highly dependent on the LCD
resolution & speed.
2021-10-12 12:12:29 -05:00
.github initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
docs fix docs 2021-10-07 14:06:20 -05:00
examples address pylint errors again 2021-10-08 21:44:06 -05:00
LICENSES initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
.gitignore initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
.pre-commit-config.yaml initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
.pylintrc initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
.readthedocs.yml initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
adafruit_ov5640.py _set_size_and_colorspace: Boost pixel clock 2021-10-12 12:12:29 -05:00
CODE_OF_CONDUCT.md initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
LICENSE initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
pyproject.toml initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
README.rst Use 20MHz, not 24MHz, master clock 2021-10-08 11:53:22 -05:00
README.rst.license initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
requirements.txt initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00
setup.py.disabled initial skeleton with cookiecutter 2021-09-29 13:01:28 -05:00

README.rst.license 

SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
SPDX-License-Identifier: MIT