43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
# SPDX-FileCopyrightText: 2021 Jeff Epler, written for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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#
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# Adapted from the example https://github.com/raspberrypi/pico-examples/tree/master/pio/pio_blink
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import array
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import time
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import board
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import rp2pio
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import adafruit_pioasm
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blink = adafruit_pioasm.assemble(
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"""
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.program blink
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pull block ; These two instructions take the blink duration
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out y, 32 ; and store it in y
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forever:
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mov x, y
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set pins, 1 ; Turn LED on
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lp1:
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jmp x-- lp1 ; Delay for (x + 1) cycles, x is a 32 bit number
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mov x, y
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set pins, 0 ; Turn LED off
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lp2:
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jmp x-- lp2 ; Delay for the same number of cycles again
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jmp forever ; Blink forever!
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"""
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)
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while True:
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for freq in [5, 8, 30]:
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with rp2pio.StateMachine(
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blink,
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frequency=125_000_000,
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first_set_pin=board.LED,
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wait_for_txstall=False,
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) as sm:
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data = array.array("I", [sm.frequency // freq])
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sm.write(data)
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time.sleep(3)
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time.sleep(0.5)
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