MicroPython Forum (Archive)

Code: Select all

import utime
import rp2
from machine import Pin

p0 = Pin(25,Pin.OUT)

# Blink state machine program. Blinks LED at 10 Hz (with freq=2000)
# 2000 Hz / (20 cycles per instruction * 10 instructions) = 10 Hz
# Single pin (base pin) starts at output and logic low
@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
def blink():
    wrap_target()
    set(pins, 1) [19]
    nop()        [19]
    nop()        [19]
    nop()        [19]
    nop()        [19]
    set(pins, 0) [19]
    nop()        [19]
    nop()        [19]
    nop()        [19]
    nop()        [19]
    
    label("wait")    # y set to '0' results in an wait loop
    jmp(not_y,"wait")    
    wrap()

# Init state machine with "blink" program
# (state machine 0, running at 2kHz, base pin is GP25 (LED))
sm = rp2.StateMachine(0, blink, freq=2000, set_base=Pin(25))

# Continually start and stop state machine
while True:
    print("Starting state machine...")
    sm.exec("set(y, 1)")
    sm.active(1)
    utime.sleep(1)

    print("Stopping state machine...")
    sm.exec("set(y, 0)")   // first stop it via register y (LED then is OFF)
    utime.sleep(0.1)
    sm.active(0)

    utime.sleep(1)
    print("LED on...")
    p0.value(1)

    utime.sleep(1)
    print("LED off...")
    p0.value(0)
    utime.sleep(1)

Code: Select all

    sm.exec("mov(osr,1)")
    sm.exec("out(pins,32) ")

Code: Select all

import time
from machine import Pin
import rp2

# Define an empty program that uses a single set pin.
@rp2.asm_pio(set_init=(rp2.PIO.OUT_LOW,rp2.PIO.OUT_LOW))
def prog():
    pass


# Construct the StateMachine, binding Pin(0) and Pin(1) to the set pin.
sm = rp2.StateMachine(0, prog, set_base=Pin(0))

# Turn on the set pin via an exec instruction.
sm.exec("set(pins, 3)")

# loop forever
while True:
    pass