2878d3aaa2
timing is very tight so we need an extra routine per timing type for sending a byte to the led strip.
132 lines
3.2 KiB
NASM
132 lines
3.2 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2026 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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sk6812JumpTableSendByte:
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rjmp sk6812SendByte0
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rjmp sk6812SendByte1
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; ***************************************************************************
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; type 0
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.macro SK6812_SENDBIT0
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sk6812SendBit: ; 0 1
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rol r16 ; +1 +1
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brcs sk6812SendBit_send1 ; +1 +2
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; send 0
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nop ; +1
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sbi SK6812_PORT, SK6812_PINNUM ; +2
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nop ; +1
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nop ; +1
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cbi SK6812_PORT, SK6812_PINNUM ; +2
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; nop ; +1
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nop ; +1
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rjmp sk6812SendBit_end ; +2
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sk6812SendBit_send1:
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; send 1
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sbi SK6812_PORT, SK6812_PINNUM ; +2
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nop ; +1
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nop ; +1
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nop ; +1
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cbi SK6812_PORT, SK6812_PINNUM ; +2
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nop ; +1
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nop ; +1
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nop ; +1
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sk6812SendBit_end: ; 13 13
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.endmacro
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; ---------------------------------------------------------------------------
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; @routine sk6812SendByte0
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;
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; Sends a byte to the LED strip
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; @param r16 byte
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; @clobbers r16 (r24, r25)
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sk6812SendByte0:
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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SK6812_SENDBIT0
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ret
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; @end
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; ***************************************************************************
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; type 1
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.macro SK6812_SENDBIT1
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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 ; +1
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nop ; +1
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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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; ---------------------------------------------------------------------------
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; @routine sk6812SendByte1
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;
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; Sends a byte to the LED strip
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; @param r16 byte
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; @clobbers r16, r24, r25
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sk6812SendByte1:
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ldi r24, 0
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ldi r25, (1<<SK6812_PINNUM)
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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SK6812_SENDBIT1
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ret
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; @end
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