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conr2286 / PocketFT8Xcvr

Yet Another Pocket FT8 Transceiver
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Touchpad needs coordination over full screen #8

Closed conr2286 closed 1 month ago

conr2286 commented 1 month ago

Despite earlier naysaying, the Pocket FT8 GUI requires the touchpad coordinates to have access to the full screen area.

The problem arises from the MCP3422's use of an internal 2.048 Volt reference that limits touchpad access to a subset of the entire display area.

conr2286 commented 1 month ago

Resolved by adding R12 and R13 (510 Ohms) to lower the driven voltage to the touchpad so that it lies below the MCP3422's 2.048 Volt reference. Tested the workaround with a patch to the V1.01 PCB. Recalibrated the X/Y Min/Max values in Test05-Touchpad, Test09-GUI and the PocketFT8FW sketch. Tests 05 and 09 now working correctly.