APM 2.8 - Read PPM signal using interruptions on PIN PL1/ICP5

[zillion42 (Tobias Houfek)]

APM 2.8 clone, no PPM RX input [solved] with reflashing 32U2 Version 2.3.17

Hi, I recently bought an APM 2.8 clone in China and had the problem that it couldn’t read my Frsky XM+ via PPM on port 1 - signal 2 and 3 closed - nothing soldered. It’s ancient hardware, I know, I just wanted to have the same plane twice, the old one also has an APM Plane V. 3.3. [IMG_20241202_190133] I then tried all sorts of things, flashed the 32U2 several times with Atmel FLIP to ArduPPM_v2.3.16_ATMega32U2 as suggested here, heated up the pins of the 32U2 with the rework station, etc. …