71 lines
1.9 KiB
NASM
71 lines
1.9 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 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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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine flashWaitForAttnState
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;
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; @param r16 expected state (0x00 or 0xff)
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; @param r17 time to wait for expected state (in milliseconds)
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; @clobbers
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flashWaitForAttnState:
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flashWaitForAttnState_loop:
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rcall flashWaitForAttnState1ms ; (R22, R24)
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brcs flashWaitForAttnState_stateReached
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dec r17
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brne flashWaitForAttnState_loop
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clc
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ret
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flashWaitForAttnState_stateReached:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine flashWaitForAttnState1ms
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;
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; Wait for up to 1ms for ATTN line to reach the given state
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;
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; @return CFLAG set if state reached, cleared otherwise
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; @param R16 expected state (0xff for high, 0 for low)
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; @clobbers R24 (R22)
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flashWaitForAttnState1ms:
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cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN port as input
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cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable internal pullup for ATTN
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ldi r24, 100
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flashWaitForAttnState1ms_loop:
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push r17
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in r17, COM_ATTN_INPUT
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eor r17, r16
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andi r17, (1<<COM_ATTN_PIN)
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pop r17
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breq flashWaitForAttnState1ms_stateReached
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rcall Utils_WaitFor10MicroSecs ; wait for 10us (R22)
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dec r24
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brne flashWaitForAttnState1ms_loop
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rjmp flash_recv_clc_ret
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flashWaitForAttnState1ms_stateReached:
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sec
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ret
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; @end
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