X-Git-Url: https://git.smho.de/gw/?p=owSlave2.git;a=blobdiff_plain;f=common%2FOWCRC8_16.s;fp=common%2FOWCRC8_16.s;h=0518dfee53fa87ade123cce77747df6fbd8b685b;hp=0000000000000000000000000000000000000000;hb=81a79648a168a1167c5ad97d4068621c1751a353;hpb=6467d8138460abffd9ddabc7b0a9f00c764af19c

diff --git a/common/OWCRC8_16.s b/common/OWCRC8_16.s
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+// Copyright (c) 2017, Tobias Mueller tm(at)tm3d.de
+// All rights reserved. 
+// 
+// Redistribution and use in source and binary forms, with or without 
+// modification, are permitted provided that the following conditions are 
+// met: 
+// 
+//  * Redistributions of source code must retain the above copyright 
+//    notice, this list of conditions and the following disclaimer. 
+//  * Redistributions in binary form must reproduce the above copyright 
+//    notice, this list of conditions and the following disclaimer in the 
+//    documentation and/or other materials provided with the 
+//    distribution. 
+//  * All advertising materials mentioning features or use of this 
+//    software must display the following acknowledgement: This product 
+//    includes software developed by tm3d.de and its contributors. 
+//  * Neither the name of tm3d.de nor the names of its contributors may 
+//    be used to endorse or promote products derived from this software 
+//    without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+
+
+.comm crc16,2
+.comm crc8,2
+#define _CRC8_16_
+
+CRC16_alg:
+	;crc
+	
+	lds r_crc,crc16;lade low byte fuer vergleich mit bit
+	mov r_temp,r_crc
+	andi r_temp,0x01 ;nur bit 0
+	cp r_temp2,r_temp  ;r_temp2 wird in interruptroutine gesetzt
+	brne crc2_16 ;nur schieben
+	;schieben und XOR
+	lds r_temp2,crc16+1
+	lsr	r_temp2
+	ror	r_crc
+	ldi	r_temp, 0x01	
+	eor	r_crc, r_temp
+	ldi	r_temp, 0xA0	;
+	eor	r_temp2, r_temp
+	rjmp crce_16
+crc2_16:
+	lds r_temp2,crc16+1
+	lsr	r_temp2
+	ror	r_crc
+crce_16:
+	sts crc16,r_crc
+	sts crc16+1,r_temp2
+	
+	ret
+
+.macro CRCS ; CRC beim Senden
+	push r_crc
+	push r_temp2
+	rcall CRC16_alg
+	pop r_temp2
+		;crc
+	lds r_crc,crc8
+	mov r_temp,r_crc
+	andi r_temp,0x01
+	cp r_temp2,r_temp
+	brne crc2_8
+	lsr r_crc
+	ldi r_temp,0x8c
+	eor r_crc,r_temp
+	rjmp crce_8
+crc2_8:
+	lsr r_crc
+crce_8:
+	sts crc8,r_crc
+	pop r_crc
+.endm
+
+.macro CRCR; CRC beim Empfangen
+	;clr r_temp2
+	;sbrc r_rwbyte,7
+	;ldi r_temp2,1
+	push r_crc
+	rcall CRC16_alg
+	pop r_crc
+.endm
+
+.macro CRCInit1; CRC initialisierung bei READ_COMMAND
+	ldi r_temp,0
+	sts crc16,r_temp
+	sts crc16+1,r_temp
+.endm
+
+.macro CRCInit2; CRC initialisierung bei READ_DATA
+	ldi r_temp,0
+	sts crc8,r_temp
+.endm