I'm programming a 16bits to 4bits comm protocol... 4 bits of data, a DEN (data enable) and a CS (chip select. ) It's just for check RP2040's capability.
importarray, time
frommachineimportPin
import rp2
#protocolo de conversion de 16bit a 4bit (en 4 tramos con una salida de DEN (data enable) franco bajada
# y EN en positivo.)
@rp2.asm_pio(out_init= [rp2.PIO.OUT_LOW] *4,
sideset_init= [rp2.PIO.OUT_HIGH] *2,
out_shiftdir=rp2.PIO.SHIFT_LEFT,
autopull=True, pull_thresh=16)
defpioNiple():
set(x, 3) .side(0b01)
label("loop")
out(pins, 4) .side(0b11)
nop() .side(0b10)
jmp(x_dec, "loop") .side(0b11)
nop() .side(0b01)
sm=rp2.StateMachine(0, pioNiple, freq=2000,
sideset_base=Pin(14),
out_base=Pin(10))
# Start the StateMachine, it will wait for data on its FIFO.
sm.active(1)
sm.put(0xFFAA)
sm.put(0xAA01)
This is when I use shift_left Channel 0..3 bit 0..3 channel 4 is DEN and channel 5 is CS.
