jepler/Adafruit_CircuitPython_NeoPxl8
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

reduce amount of pio code strings

Browse source
This commit is contained in:
Jeff Epler 2022-11-16 10:16:58 -06:00
parent c86c6c0b62
commit 8561bed8dd
No known key found for this signature in database
GPG key ID: D5BF15AB975AB4DE
1 changed files with 11 additions and 60 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

71
adafruit_neopxl8.py
View file

@ -19,7 +19,7 @@ import bitops
import adafruit_pixelbuf
import rp2pio
_PROGRAM8 = """
_PROGRAM = """
.program piopixl8
top:
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
@ -32,7 +32,7 @@ top:
bitloop:
pull ifempty [1] ; don't start outputting HIGH unless data is available (always-low part)
mov pins, ~ null [3] ; always-high part
out pins, 8 [4] ; variable part
{} ; variable part
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
jmp y--, bitloop ; always-low part
@ -46,60 +46,6 @@ wait_reset:
jmp top
"""
_PROGRAMN = """
.program piopixl8
top:
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
pull block ; wait for fresh data
out y, 32 ; get count of NeoPixel bits
; NeoPixels are 800khz bit streams. We are choosing zeros as <312ns hi, 936 lo>
; and ones as <700 ns hi, 546 ns lo> and a clock of 16*800kHz, so the always-high
; time is 4 cycles, the variable time is 5 cycles, and the always-low time is 7 cycles
bitloop:
pull ifempty [1] ; don't start outputting HIGH unless data is available (always-low part)
mov pins, ~ null [3] ; always-high part
out pins, {} [3] ; variable part
out x, {} ; variable part
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
jmp y--, bitloop ; always-low part
; A minimum delay is required so that the next pixel starts refreshing the front of the strands
pull block
out y, 32
wait_reset:
jmp y--, wait_reset
jmp top
"""
_PROGRAM1 = """
.program piopixl8
top:
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
pull block ; wait for fresh data
out y, 32 ; get count of NeoPixel bits
; NeoPixels are 800khz bit streams. We are choosing zeros as <312ns hi, 936 lo>
; and ones as <700 ns hi, 546 ns lo> and a clock of 16*800kHz, so the always-high
; time is 4 cycles, the variable time is 5 cycles, and the always-low time is 7 cycles
bitloop:
pull ifempty [1] ; don't start outputting HIGH unless data is available (always-low part)
mov pins, ~ null [3] ; always-high part
out pins, 1 [4] ; variable part
mov pins, null ; always-low part (last cycle is the 'pull ifempty' after wrap)
jmp y--, bitloop ; always-low part
; A minimum delay is required so that the next pixel starts refreshing the front of the strands
pull block
out y, 32
wait_reset:
jmp y--, wait_reset
jmp top
"""
# Pixel color order constants
RGB = "RGB"
@ -199,12 +145,17 @@ class NeoPxl8(adafruit_pixelbuf.PixelBuf):
self._num_strands = num_strands
if num_strands == 8:
assembled = adafruit_pioasm.assemble(_PROGRAM8)
variable_part = "out pins, 8 [4] ; variable part"
elif num_strands == 1:
assembled = adafruit_pioasm.assemble(_PROGRAM1)
variable_part = "out pins, 1 [4] ; variable part"
else:
program = _PROGRAMN.format(num_strands, 8 - num_strands)
assembled = adafruit_pioasm.assemble(program)
variable_part = f"""
out pins, {num_strands} [3] ; variable part
out x, {8-num_strands} ; variable part
"""
program = _PROGRAM.format(variable_part)
assembled = adafruit_pioasm.assemble(program)
self._sm = rp2pio.StateMachine(
assembled,