Raspberry Pi Pico Python SDK Manual page 21

Raspberry Pi Pico Python SDK
18
19
20 rp2.PIO(0).irq(lambda
21
22 sm = rp2.StateMachine(0, irq_test, freq=1000)
23 sm.active(1)
24 time.sleep(1)
25 sm.active(0)
An example program that blinks at 1Hz and raises an IRQ at 1Hz to print the current millisecond timestamp,
Pico MicroPython Examples:
1 # Example using PIO to blink an LED and raise an IRQ at 1Hz.
2
3 import
4 from
5 import
6
7
8 @rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
9 def blink_1hz():
10 # Cycles: 1 + 1 + 6 + 32 * (30 + 1) = 1000
11 irq(rel(0))
12 set(pins, 1)
13 set(x, 31)
14 label("delay_high")
15 nop()
16 jmp(x_dec, "delay_high")
17
18 # Cycles: 1 + 7 + 32 * (30 + 1) = 1000
19 set(pins, 0)
20 set(x, 31)
21 label("delay_low")
22 nop()
23 jmp(x_dec, "delay_low")
24
25
26 # Create the StateMachine with the blink_1hz program, outputting on Pin(25).
27 sm = rp2.StateMachine(0, blink_1hz, freq=2000, set_base=Pin(25))
28
29 # Set the IRQ handler to print the millisecond timestamp.
30 sm.irq(lambda
31
32 # Start the StateMachine.
33 sm.active(1)
or to wait for a pin change and raise an IRQ.
Pico MicroPython Examples:
1 # Example using PIO to wait for a pin change and raise an IRQ.
2 #
3 # Demonstrates:
4 # - PIO wrapping
5 # - PIO wait instruction, waiting on an input pin
6 # - PIO irq instruction, in blocking mode with relative IRQ number
7 # - setting the in_base pin for a StateMachine
8 # - setting an irq handler for a StateMachine
9 # - instantiating 2x StateMachine's with the same program and different pins
3.9. PIO Support
pio: print(pio.irq().flags()))
https://github.com/raspberrypi/pico-micropython-examples/tree/master/pio/pio_1hz.py
time
machine import Pin
rp2
p: print(time.ticks_ms()))
https://github.com/raspberrypi/pico-micropython-examples/tree/master/pio/pio_pinchange.py
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