# SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Unlicense OR CC0-1.0

cfg prefetch false
cfg eof_on downstream
cfg trailing_bytes 32
cfg lut_width_bits 32

# WS2812 symbol definition in RMT data format
lut 0x80030009 # Zero
lut 0x80090003 # One
lut 0x00F000F0 # Reset

# Output the WS2812 reset symbol first
# The reset code is saved in LUT index 2 (0b10)
set 17 H, set 16 L
set 31..0 L31..L0, write 32

byteloop:
	# Load one byte into counter B
	# the read byte will be save to the MSB of the input FIFO, i.e. [63:56]
	read 8, set 16..23 56..63, ldctibl

bitloop:
	# Output MSB of byte as LUT index (0 or 1)
	set 16 B7

	# Write LUT output
	set 31..0 L31..L0, write 32

	# Shift BL up by one bit
	set 16 L, set 17..23 B0..B6, ldctibl

	# Do this for all 8 bits
	loopa 7 1 bitloop

	# All bits are done, handle next byte
	jmp byteloop