From 4bc0cb72284feee6dd7fdfb5d383d476531fa7b6 Mon Sep 17 00:00:00 2001 From: Minecon724 Date: Tue, 14 May 2024 17:26:58 +0200 Subject: [PATCH] initial commit --- LICENSE | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ ws2811.py | 65 +++++++++++++++++++++++++++++ 2 files changed, 186 insertions(+) create mode 100644 LICENSE create mode 100644 ws2811.py diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..0e259d4 --- /dev/null +++ b/LICENSE @@ -0,0 +1,121 @@ +Creative Commons Legal Code + +CC0 1.0 Universal + + CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE + LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN + ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS + INFORMATION ON AN "AS-IS" BASIS. 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Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to + this CC0 or use of the Work. diff --git a/ws2811.py b/ws2811.py new file mode 100644 index 0000000..27eb058 --- /dev/null +++ b/ws2811.py @@ -0,0 +1,65 @@ +from machine import Pin +from rp2 import PIO, StateMachine, asm_pio +from time import sleep_ms, sleep_us +from random import randint + +LEDS = 3 +PIN = Pin(16) + +""" +inspired by https://github.com/raspberrypi/pico-micropython-examples/blob/master/pio/pio_ws2812.py +I made this for no other purpose than learning +took me a few hours to understand pio, but if I did it you can too + +ws2811 has different timing: +0 - 250ns, then 1000ns +1 - 600ns, then 650ns +rpi cpu cycle = 8ns + +to make things easier, we can split timing: +0 -> 250ns high + 350 low + 650 low +1 -> 250ns high + 350 high + 650 low + +p1 -> 250ns = 31.25 cycles +p2 -> 350ns = 43.75 cycles +p3 -> 650ns = 81.25 cycles +decimal, but it's fine if it's off by some, so we can round +""" + +@asm_pio(sideset_init=PIO.OUT_LOW, + out_shiftdir=PIO.SHIFT_LEFT, + autopull=True, pull_thresh=24) +def prog(): + label("loop") + + # 3rd part + nop().side(0).delay(14) # 15 + nop().side(0).delay(14) # 30 + nop().side(0).delay(14) # 45 + nop().side(0).delay(14) # 60 + nop().side(0).delay(14) # 75 + out(x, 1).side(0).delay(5) # 81. get one bit of color + + # 1st part + nop().side(1).delay(15) # 16 + jmp(not_x, "zero").side(1).delay(14) # 31. check if zero + + # 2nd part for 1 bit + nop().side(1).delay(14) # 15 + nop().side(1).delay(14) # 30 + jmp("loop").side(1).delay(12) # 43 + + # 2nd part for 0 bit + label("zero") + nop().side(0).delay(14) # 15 + nop().side(0).delay(14) # 30 + nop().side(0).delay(12) # 43 + +sm = StateMachine(0, prog, sideset_base=PIN) +sm.active(1) + +while True: + for i in range(LEDS): + sm.put(randint(0, 0xFFFFFF), 8) # I still don't know why 8 not 24 + + sleep_ms(500) \ No newline at end of file