db3f88f3af
- move IRQ control to main code (only the main code knows exactly which combination of pins is used for com2) - split one big module into multiple smaller files (easier to maintain)
72 lines
2.0 KiB
NASM
72 lines
2.0 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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#ifndef AVR_MODULES_COM2W2_MSGREAD_H
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#define AVR_MODULES_COM2W2_MSGREAD_H
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.cseg
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; ---------------------------------------------------------------------------
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; @routine com2w2RecvMsg
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;
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; Receive a packet into buffer pointed to by X.
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; Expects interrupts to be disabled.
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;
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; @param R19 max buffer size
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; @param X buffer to receive to
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; @return CFLAG set if msg received, cleared on error (see R16)
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; @return R16 if CFLAG cleared: 0=message not for this node, otherwise error
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; @clobbers r16, r17, r18, r19, r20, r22, r24, r25, X
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com2w2RecvMsg:
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; check buffer size
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subi r19, 2
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brcs com2w2RecvMsg_eBadSize
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; read destination address
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rcall com2w2RecvByte ; (r17, r18, r20, r22)
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brcc com2w2RecvMsg_eIo
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st X+, r16
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; read remaining msg size
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rcall com2w2RecvByte ; (r17, r18, r20, r22)
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brcc com2w2RecvMsg_eIo
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st X+, r16
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inc r16 ; account for CRC byte
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sub r19, r16
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brcs com2w2RecvMsg_eBadSize
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mov r19, r16
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com2w2RecvMsg_loop:
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rcall com2w2RecvByte ; (r17, r18, r20, r22)
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brcc com2w2RecvMsg_eIo
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st X+, r16
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dec r19
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brne com2w2RecvMsg_loop
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sec
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rjmp com2w2RecvMsg_end
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com2w2RecvMsg_eBadSize:
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ldi r16, NET_IFACE_OFFS_ERR_MSGSIZE_LOW
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rjmp com2w2RecvMsg_incCounterRet
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com2w2RecvMsg_eIo:
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ldi r16, NET_IFACE_OFFS_ERR_IO_LOW
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com2w2RecvMsg_incCounterRet:
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rcall NET_Interface_IncCounter16 ; (R24, R25)
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rcall com2w2RecvByteWaitForQuietClk ; (r18, r20, r22)
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com2w2RecvMsg_clcRet:
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clc
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com2w2RecvMsg_end:
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ret
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; @end
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#endif
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