What I will try first is to implement how the PBs before the APB6 was implemented. If that does not work then I will need someone to measure on a real APB6 to see if the protocol has changed with later APB6 firmware upgrades. The specification at electric images.co.nz is 5 years old.
It turned out that I had too slow timing on the one- and zero-bits in the protocol. I used 120us and 240us where it turned out that it needed to be 116us and 232us. Now it works just fine with the new DPR-chip C8515.
Big thanks to Top Down for lending me a C8515-chip to use during my troubleshooting and verification!
The Black friday deal is still on, since this bug was found just days in advance of the deal.
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