I/Q

[letonton]

Hello, I made a square wave generator using PIO state machines, ok
I'd like to build a versions producing two output pins in Inphase/Quadrature
relationship (same frequency with a syncronous and exactly 90 degrees of
reciprocall phase shift)
Thanks for help !

[rkompass]

You might try something like:

@asm_pio(sideset_init=(PIO.OUT_LOW, PIO.OUT_LOW), in_shiftdir=PIO.SHIFT_LEFT, out_shiftdir=PIO.SHIFT_RIGHT)
def qgen():
    nop()                  .side(0b00)        [9]
    nop()                  .side(0b00)        [14]
    nop()                  .side(0b01)        [9]
    nop()                  .side(0b01)        [14]
    nop()                  .side(0b11)        [9]
    nop()                  .side(0b11)        [14]
    nop()                  .side(0b10)        [9]
    nop()                  .side(0b10)        [13]

One quadrature cycle should correspond to 100 PIO instructions.