36 lines
871 B
Python
36 lines
871 B
Python
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# Example using PIO to blink an LED and raise an IRQ at 1Hz.
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import time
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from machine import Pin
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import rp2
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@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
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def blink_1hz():
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# fmt: off
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# Cycles: 1 + 1 + 6 + 32 * (30 + 1) = 1000
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irq(rel(0))
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set(pins, 1)
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set(x, 31) [5]
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label("delay_high")
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nop() [29]
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jmp(x_dec, "delay_high")
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# Cycles: 1 + 7 + 32 * (30 + 1) = 1000
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set(pins, 0)
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set(x, 31) [6]
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label("delay_low")
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nop() [29]
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jmp(x_dec, "delay_low")
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# fmt: on
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# Create the StateMachine with the blink_1hz program, outputting on Pin(25).
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sm = rp2.StateMachine(0, blink_1hz, freq=2000, set_base=Pin(25))
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# Set the IRQ handler to print the millisecond timestamp.
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sm.irq(lambda p: print(time.ticks_ms()))
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# Start the StateMachine.
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sm.active(1)
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