Add adc_ladder() factory for ADC resistor-ladder binary inputs#78
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ADC resistor-ladder buttons (input_type=2) share one ADC pin and are distinguished by voltage. adc_ladder() packs (N, id_base) + (N+1) strictly-descending LE uint16 thresholds into BinaryInputs.reserved[14], matching the firmware's registerAdcLadder decode byte-for-byte. Validation mirrors the firmware contract so this helper can't build a config the device would silently drop: - 2..6 thresholds (N = 1..5; reserved[14] holds at most N+1=6) - thresholds strictly descending, each a uint16 - button_data_byte_index 0..10 (index into the 11-byte MSD block) - id_base >= 0 and last id <= 7 (button id is a 3-bit report field) Adds BinaryInputType enum and tests pinning the wire contract plus every rejection branch. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Matches firmware OpenDisplay#35 review: input_type == 2 is reserved for the host-side switch feature. Add SWITCH = 2 to model the reservation and renumber ADC_LADDER to 3. Wire layout is otherwise unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
g4bri3lDev
approved these changes
Jul 3, 2026
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Matching PR to OpenDisplay/Firmware#35, this adds support for configs of analog buttons. Tested live on an XTEINK X4, and I tried to make it as generic as possible. As always, let me know if something doesn't look right / should be architected differently, I'm still learning (obvs!) so any/all feedback is very welcome.
Robot's commit message:
ADC resistor-ladder buttons (input_type=2) share one ADC pin and are distinguished by voltage. adc_ladder() packs (N, id_base) + (N+1) strictly-descending LE uint16 thresholds into BinaryInputs.reserved[14], matching the firmware's registerAdcLadder decode byte-for-byte.
Validation mirrors the firmware contract so this helper can't build a config the device would silently drop:
Adds BinaryInputType enum and tests pinning the wire contract plus every rejection branch.