ssd1681: Fix OverflowError for displays larger than 255x255. #90
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Need to explicitly truncate to just the low-order byte; otherwise, creating these bytearrays results in `OverflowError: value must fit in 1 byte(s)`.
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Also: if I have the time I'll see if this pattern occurs in other drivers too and add fixes for them as well. |
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i tested with a feather thinkink and a 1681 monochrome and 1683 tri-color. the driver is not working for the 1683, so i'll be adding a new driver for it. but the monochrome works as expected with this change |
BlitzCityDIY
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Aug 13, 2025
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Updating https://github.com/adafruit/Adafruit_CircuitPython_DotStar to 2.2.18 from 2.2.17: > Merge pull request adafruit/Adafruit_CircuitPython_DotStar#71 from dhalbert/spi-lock-managment Updating https://github.com/adafruit/Adafruit_CircuitPython_EPD to 2.15.0 from 2.14.0: > Merge pull request adafruit/Adafruit_CircuitPython_EPD#94 from adafruit/UC8197 > Merge pull request adafruit/Adafruit_CircuitPython_EPD#95 from adafruit/ssd1883 > Merge pull request adafruit/Adafruit_CircuitPython_EPD#93 from adafruit/ssd1680_fix > Merge pull request adafruit/Adafruit_CircuitPython_EPD#90 from AJMansfield/patch-1 Updating https://github.com/adafruit/Adafruit_CircuitPython_JD79661 to 1.0.1 from 1.0.0: > Merge pull request adafruit/Adafruit_CircuitPython_JD79661#1 from adafruit/cleanup Updating https://github.com/adafruit/Adafruit_CircuitPython_TLV320 to 1.2.1 from 1.1.0: > Merge pull request adafruit/Adafruit_CircuitPython_TLV320#11 from samblenny/fix-example-link > Merge pull request adafruit/Adafruit_CircuitPython_TLV320#10 from samblenny/volume-fixes Updating https://github.com/adafruit/Adafruit_CircuitPython_FruitJam to 1.2.0 from 0.5.0: > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#13 from FoamyGuy/volume_api > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#14 from mikeysklar/ntp-helper > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#12 from mikeysklar/headphone-speaker > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#11 from adafruit/TheKitty-patch-1 > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#9 from relic-se/request_display_config-default > Merge pull request adafruit/Adafruit_CircuitPython_FruitJam#8 from relic-se/any_button_pressed-fix Updating https://github.com/adafruit/Adafruit_CircuitPython_Bundle/circuitpython_library_list.md to NA from NA: > Added the following libraries: Adafruit_CircuitPython_UC8253
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When trying to use this driver with a display with dimensions larger than 255x255, the arithmetic operations that attempt to format the width and height into a pair of bytes in the ssd1681 driver's
power_upfunction leaves extra overflowing high-order bits in the low-order byte, resulting in an error:OverflowError: value must fit in 1 byte(s), originating from line 146 (for widths larger than 255) or 153 (for heights larger than 255).This PR fixes this by explicitly masking out just the low byte; it also fixes another instance of this pattern in
set_ram_address(though I've not gone into detail trying to figure out inputs to actually trigger an error from this instance).I've tested this change using an 400x300 HINK-E042A88 SSD1683 display, connected via an Adafruit eInk Feather Friend to my Adafruit Feather RP2040.
Based on my tests I can confirm that this PR addresses the above issue; display operations appear to run correctly with it.