166 lines
3.5 KiB
NASM
166 lines
3.5 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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#ifndef AVR_MODULES_COM2W_COM2WN_IO_H
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#define AVR_MODULES_COM2W_COM2WN_IO_H
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; WORK IN PROGRESS
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.cseg
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; ---------------------------------------------------------------------------
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; @routine com2wSetupLines
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com2wSetupLines:
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; setup CLK line (as input, disable internal pull-up resistor)
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rcall com2wClkSetHigh
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.ifdef COM_CLK_PUE
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_CLK
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com r16
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inr r17, COM_CLK_PUE
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and r17, r16
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outr COM_CLK_PUE, r17
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.endif
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; setup DATA line (as input, disable internal pull-up resistor)
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rcall com2wnDataSetHigh
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.ifdef COM_DATA_PUE
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_DATA
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com r16
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inr r17, COM_DATA_PUE
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and r17, r16
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outr COM_DATA_PUE, r17
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.endif
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine com2wClkSetHigh
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;
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; @clobbers none
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com2wClkSetHigh:
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push r16
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push r17
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_CLK
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; clear bit in io reg (AND with complement)
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com r16
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inr r17, COM_CLK_DDR
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and r17, r16
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outr COM_CLK_DDR, r17 ; make pin input
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.ifndef COM_CLK_PUE
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inr r17, COM_CLK_OUTPUT
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and r17, r16 ; disable pullup
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outr COM_CLK_OUTPUT, r17
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.endif
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pop r17
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pop r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine com2wnClkSetLow
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;
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; @param Y pointer to interface data in SRAM
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; @clobbers none
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com2wnClkSetLow:
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push r16
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push r17
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_CLK
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; set bit in io reg
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inr r17, COM_CLK_DDR
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or r17, r16
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outr COM_CLK_DDR, r17 ; make pin output
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com r16
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inr r17, COM_CLK_OUTPUT
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and r17, r16
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outr COM_CLK_OUTPUT, r17 ; set pin low
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pop r17
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pop r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine com2wnDataSetHigh
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;
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; @param Y pointer to interface data in SRAM
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; @clobbers none
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com2wnDataSetHigh:
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push r16
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push r17
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_DATA
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; clear bit in io reg (AND with complement)
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com r16
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inr r17, COM_DATA_DDR
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and r17, r16
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outr COM_DATA_DDR, r17 ; make pin input
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.ifndef COM_DATA_PUE
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inr r17, COM_DATA_OUTPUT
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and r17, r16 ; disable pullup
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outr COM_DATA_OUTPUT, r17
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.endif
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pop r17
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pop r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine com2wnDataSetLow
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;
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; @param Y pointer to interface data in SRAM
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; @clobbers none
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com2wnDataSetLow:
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push r16
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push r17
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ldd r16, Y+COM2W_IFACE_OFFS_PINMASK_DATA
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; set bit in io reg
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inr r17, COM_DATA_DDR
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or r17, r16
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outr COM_DATA_DDR, r17 ; make pin output
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com r16
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inr r17, COM_DATA_OUTPUT
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and r17, r16
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outr COM_DATA_OUTPUT, r17 ; set pin low
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pop r17
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pop r16
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ret
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; @end
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#endif ; AVR_MODULES_COM2W_COM2WN_IO_H
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