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pioasm_neopixel: Adapt to various boards

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On any board with a NEOPIXEL pin defined, use it.  Otherwise, arbitrarily
use D16 which is conveniently at a corner of the Pico board.

Send several different pixel colors so that the user can see it working.
This commit is contained in:
Jeff Epler 2021-03-02 09:40:38 -06:00
parent 235dc408ec
commit 937357eab1
1 changed files with 15 additions and 4 deletions
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19
examples/pioasm_neopixel.py
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@ -5,6 +5,7 @@
import time
import rp2pio
import board
import microcontroller
import adafruit_pioasm
# NeoPixels are 800khz bit streams. Zeroes are 1/3 duty cycle (~416ns) and ones
@ -25,21 +26,31 @@ do_zero:
assembled = adafruit_pioasm.assemble(program)
# If the board has a designated neopixel, then use it. Otherwise use
# GPIO16 as an arbitrary choice.
if hasattr(board, "NEOPIXEL"):
NEOPIXEL = board.NEOPIXEL
else:
NEOPIXEL = microcontroller.pin.GPIO16
sm = rp2pio.StateMachine(
assembled,
frequency=800000 * 6, # 800khz * 6 clocks per bit
init=adafruit_pioasm.assemble("set pindirs 1"),
first_set_pin=board.D12,
first_sideset_pin=board.D12,
first_set_pin=NEOPIXEL,
first_sideset_pin=NEOPIXEL,
auto_pull=True,
out_shift_right=False,
pull_threshold=8,
)
print("real frequency", sm.frequency)
for i in range(100):
for i in range(30):
sm.write(b"\x0a\x00\x00")
time.sleep(0.1)
sm.write(b"\x00\x0a\x00")
time.sleep(0.1)
sm.write(b"\x00\x00\x0a")
time.sleep(0.1)
print("writes done")
time.sleep(2)