Example pwm.pio re-implementation not working

[zeroflow]

I've had my try at replicating the pwm.pio example from the raspberry pi GitHub.

The C-Code ported to CircuitPython does not work, and generates different pio assembly code than if rewritten in MicroPyton.

Pwm_Example_MP_CP.zip

One notable difference is in the generated pio binary code:

CP: [32896, 40999, 41030, 165, 4102, 41026, 131]
MP: [36992, 40999, 41030, 165, 6150, 41026, 131]

Looking at a disassembled version of these numbers, it can be seen, that the sideset arguments are different between both versions.

CircuitPython
PUSH    noblock 00000 <----------
MOV     X OSR   00000
MOV     Y ISR   00000
JMP     X!=Y 5  00000
JMP      6      10000 <----------
MOV     Y Y     00000
JMP     Y-- 3   00000

Micropython
PUSH    noblock 10000 <----------
MOV     X OSR   00000
MOV     Y ISR   00000
JMP     X!=Y 5  00000
JMP      6      11000 <----------
MOV     Y Y     00000
JMP     Y-- 3   00000

That's just one example, I've also had troubles getting other pio code to run, but this was the most understandable for debugging.

[tannewt]

I suspect this is due to #16 (lack of sideset opt support). With opt set, one bit is used to say if it is active or not IIRC.