147f920eb6
still doesn't work with new 5m LED strips from BTF-Lighting (1m strips do work, as do older 5m stripes).
229 lines
5.1 KiB
NASM
229 lines
5.1 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2024 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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; ***************************************************************************
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; defines
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.equ SK6812_PATTERN_NUM = 3
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; ***************************************************************************
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; data
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.dseg
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sk6812DataBegin:
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sk6812NumLeds: .byte 1
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sk6812Pattern: .byte 5*SK6812_PATTERN_NUM ; 1 byte num leds, 4 bytes colour (RGBW)
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sk6812DataEnd:
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; SK6812_Init
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;
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; IN:
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; - nothing
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; OUT:
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; - CFLAG: set if okay, clear on error
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; USED:
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SK6812_Init:
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; ldi xh, HIGH(sk6812DataBegin)
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; ldi xl, LOW(sk6812DataBegin)
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; clr r16
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; ldi r17, (sk6812DataEnd-sk6812DataBegin)
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; rcall Utils_FillSram
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sbi SK6812_DDR, SK6812_PINNUM ; set to output
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cbi SK6812_PORT, SK6812_PINNUM ; set LOW
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ldi r16, 150
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sts sk6812NumLeds, r16
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ldi r18, 255 ; R
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ldi r19, 69 ; G
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ldi r20, 0 ; B
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ldi r21, 0 ; W
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rcall SK6812_SetAllColor ; r23 (r16, r17)
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sec
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ret
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SK6812_Init_error:
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clc
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ret
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; ---------------------------------------------------------------------------
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; @routine SK6812_Fini
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;
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; @return CFLAG set if okay, clear on error
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; USED:
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SK6812_Fini:
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sec
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine SK6812_SetAllColor @global
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;
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; Set all LEDs to same colour.
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;
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; @param r18 red value
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; @param r19 green value
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; @param r20 blue value
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; @param r21 white value
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; @clobbers r23 (r16, r17, r24, r25)
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SK6812_SetAllColor:
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push r15
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in r15, SREG
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cli
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; reset
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cbi SK6812_PORT, SK6812_PINNUM
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Utils_WaitNanoSecs 80000, 0, r22 ; wait for 80us
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lds r23, sk6812NumLeds
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SK6812_SetAllColor_loop:
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rcall sk6812SendQuadruple ; (r16, r17, r24, r25)
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dec r23
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brne SK6812_SetAllColor_loop
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; sbi SK6812_PORT, SK6812_PINNUM
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out SREG, r15
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pop r15
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine sk6812SendPattern
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;
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; Send given pattern to LEDs.
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;
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; @param R22 number of 5-byte subpatterns
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; @param X pointer to pattern (numleds, R, G, B, W)*SK6812_PATTERN_NUM
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; @clobbers R18, R19, R20, R21, R22, R23, X (R16, R17)
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sk6812SendPattern:
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sk6812SendPattern_loop1:
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ld r23, X+ ; num leds
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tst r23
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brne sk6812SendPattern_readandset
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ret ; no leds, done
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sk6812SendPattern_readandset:
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ld r18, X+ ; R
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ld r19, X+ ; G
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ld r20, X+ ; B
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ld r21, X+ ; W
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sk6812SendPattern_loop2:
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rcall sk6812SendQuadruple ; (r16, r17)
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dec r23
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brne sk6812SendPattern_loop2
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dec r22
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brne sk6812SendPattern_loop1
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine sk6812SendQuadruple
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;
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; Sends GRBW
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; @param r18 red value
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; @param r19 green value
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; @param r20 blue value
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; @param r21 white value
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; @clobbers r16 (r17, r24, r25)
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sk6812SendQuadruple:
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mov r16, r19 ; G
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rcall sk6812SendByte4 ; (r16, r17, r24, r25)
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mov r16, r18 ; R
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rcall sk6812SendByte4 ; (r16, r17, r24, r25)
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mov r16, r20 ; B
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rcall sk6812SendByte4 ; (r16, r17, r24, r25)
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mov r16, r21 ; W
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rcall sk6812SendByte4 ; (r16, r17, r24, r25)
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @macro M_SK6812_HANDLEBIT
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.macro M_SK6812_HANDLEBIT
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lsl r16 ; +1
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brcs l_sendOne ; +1 if false, +2 if branch taken
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; send ZERO
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nop ; +1
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out SK6812_PORT, r25 ; +1 HIGH
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nop
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nop
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nop
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out SK6812_PORT, r24 ; +1
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nop ; +1
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rjmp l_end ; +2
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l_sendOne:
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out SK6812_PORT, r25 ; +1 HIGH
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nop ; +1
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nop ; +1
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nop ; +1
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nop ; +1
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nop ; +1
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out SK6812_PORT, r24 ; +1
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nop ; +1
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l_end:
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.endmacro
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; @end
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; ---------------------------------------------------------------------------
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; @routine sk6812SendByte4
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;
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; reset: 80microsecs
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; 0: 500ns high, 750ns low (+/- 150ns)
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; 1: 750ns high, 500ns low (+/- 150ns)
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; 8 ticks per cycle
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;
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; @param r16 value
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; @clobbers r16, r17, r24, r25
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sk6812SendByte4:
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ldi r24, 0
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ldi r25, (1<<SK6812_PINNUM)
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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M_SK6812_HANDLEBIT
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ret ; +4
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; @end
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