169 lines
4.7 KiB
NASM
169 lines
4.7 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2023 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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; This file contains packet receiption handlers for the address protocol
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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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; CPRO_Address_OnPacketReceived:
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;
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; Try to handle the given packet.
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;
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; IN:
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; - X : pointer to received buffer
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; OUT:
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; - CFLAG: set if handled, cleared otherwise
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; USED: depending on called routines
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CPRO_Address_OnPacketReceived:
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adiw xh:xl, COM2_MSG_OFFS_CMD
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ld r16, x
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sbiw xh:xl, COM2_MSG_OFFS_CMD
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ldi r17, (cproPacketTypeTransTableEnd-cproPacketTypeTransTableBegin) & 0xff
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ldi zl, LOW(cproPacketTypeTransTableBegin)
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ldi zh, HIGH(cproPacketTypeTransTableBegin)
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rcall Utils_FindBytePositionInTable
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brcc CPRO_Address_OnPacketReceived_nc
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ldi r17, (cproPacketTypeTransTableEnd-cproPacketTypeTransTableBegin) & 0xff
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ldi zl, LOW(cproPacketTypeHandleTable)
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ldi zh, HIGH(cproPacketTypeHandleTable)
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rcall Utils_TableJump
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sec
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ret
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CPRO_Address_OnPacketReceived_nc:
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clc
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ret
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cproPacketTypeTransTableBegin:
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.db CPRO_CMD_PING, CPRO_CMD_NEED_ADDRESS, CPRO_CMD_HAVE_ADDRESS, CPRO_CMD_ADDRESS_RANGE, CPRO_CMD_DENY_ADDRESS, CPRO_CMD_CLAIM_ADDRESS
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cproPacketTypeTransTableEnd:
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; position within table must be in same order as in table above!
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cproPacketTypeHandleTable:
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.dw cproHandlePing, cproHandleNeedAddr, cproHandleHaveAddr, cproHandleAddrRange, cproHandleDenyAddr, cproHandleClaimAddr
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cproHandleNeedAddr:
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lds r17, cproMode
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cpi r17, CPRO_MODE_NORMAL
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brne cproHandleNeedAddr_done
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; enter CPRO_MODE_SENDING_HAVE_ADDR mode
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lds r16, com2Address
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tst r16
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breq cproHandleNeedAddr_done ; we have no address, don't handle
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ldi r24, CPRO_MODE_SENDING_HAVE_ADDR ; start singleshot timer for sending HAVE_ADDRESS
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sts cproMode, r24
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lds r24, com2Address
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clr r25
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adiw r25:r24, 3
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rjmp cproAddressSetTimer
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cproHandleNeedAddr_done:
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sec
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ret
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cproHandleHaveAddr:
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lds r17, cproMode
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cpi r17, CPRO_MODE_GETADDRSTARTED
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brne cproHandleHaveAddr_done
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; validate address
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adiw xh:xl, CPRO_PACKET_HAVEADDR_OFFS_ADDRESS
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ld r16, x
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sbiw xh:xl, CPRO_PACKET_HAVEADDR_OFFS_ADDRESS
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tst r16
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breq cproHandleHaveAddr_done ; invalid address, ignore
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cpi r16, 127
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brcc cproHandleHaveAddr_done ; invalid address, ignore
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; set bit corresponding to given address in bitfield of used addresses
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dec r16
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rcall cproSetBitInBitfield
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cproHandleHaveAddr_done:
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sec
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ret
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cproHandleClaimAddr:
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adiw xh:xl, CPRO_PACKET_CLAIMADDR_OFFS_ADDRESS
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ld r16, x
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tst r16
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breq cproHandleClaimAddr_done
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cpi r16, 0xff
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breq cproHandleClaimAddr_done
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lds r17, com2Address
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tst r17
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breq cproHandleClaimAddr_done
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cp r16, r17
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brne cproHandleClaimAddr_done
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ldi r16, CPRO_MODE_SEND_DENY_ADDR
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sts cproMode, r16
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rcall cproAddressSetTimer1s
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cproHandleClaimAddr_done:
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sec
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ret
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cproHandleDenyAddr:
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; check mode
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lds r17, cproMode
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cpi r17, CPRO_MODE_CLAIMING_ADDR1
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brcs cproHandleDenyAddr_notInClaimAddr13Mode
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cpi r17, CPRO_MODE_CLAIMING_ADDR3+1
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brcc cproHandleDenyAddr_notInClaimAddr13Mode
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; we are in one of the three CLAIM_ADDRESS modes and received a DENY_ADDR, check address
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adiw xh:xl, CPRO_PACKET_DENYADDR_OFFS_ADDRESS
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ld r16, x
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sbiw xh:xl, CPRO_PACKET_DENYADDR_OFFS_ADDRESS
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lds r17, cproAddrRangeBegin
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cp r16, r17
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brne cproHandleDenyAddr_done ; not our currently claimed address, ignore
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; someone denied us our claimed address, try next
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rcall cproGetNextFreeAddr
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brcs cproHandleDenyAddr_gotFreeAddr
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; no free address, abort TODO: send an error message to bus ("bus full")
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ldi r16, CPRO_MODE_NOADDRESS
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sts cproMode, r16
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ret
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cproHandleDenyAddr_gotFreeAddr: ; claim next address
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ldi r16, CPRO_MODE_SEND_CLAIM_ADDR1
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sts cproMode, r16
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rcall cproAddressSetTimer1s ; start timer
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rjmp cproHandleDenyAddr_done
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cproHandleDenyAddr_notInClaimAddr13Mode: ; reclaim mode?
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lds r17, cproMode
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cpi r17, CPRO_MODE_RECLAIMING_ADDR
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brne cproHandleDenyAddr_done
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; reclaiming went wrong, go through full address assignment protocol
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rcall CPRO_StartGetAddrProcedure
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cproHandleDenyAddr_done:
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sec
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ret
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