fcs.s

AVR单片机系统开发经典实例部分源程序

;  	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
;  	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
; 	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
;  	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
; 	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
;  	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
;  	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
;  	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
;  	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
;  	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
;  	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
; 	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
; };
; /*
; rom u32	FCS_Table_32[]	=	{	// 32-bit PPP Polynomial
; 	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
; 	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
; 	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
; 	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
; 	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
; 	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
; 	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
; 	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
; 	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
; 	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
; 	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
; 	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
; 	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
; 	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
; 	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
; 	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
; 	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
; 	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
; 	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
; 	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
; 	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
; 	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
; 	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
; 	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
; 	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
; 	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
; 	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
; 	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
; 	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
; 	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
; 	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
; 	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
; };
; */
; //**************************************************************************
; 
; u16 UpdateFCS_16(u16 fcs, u8 c)
; {	// update fcs - fast table method
	.dbline 117
; 	return (fcs >> 8) ^ FCS_Table_16[(fcs & 0xff) ^ c];
	mov R2,R22
	clr R3
	movw R18,R20
	andi R19,0
	eor R18,R2
	eor R19,R3
	ldi R16,2
	ldi R17,0
	xcall empy16s
	movw R30,R16
	ldi R24,<_FCS_Table_16
	ldi R25,>_FCS_Table_16
	add R30,R24
	adc R31,R25
	lpm R0,Z+
	lpm R1,Z
	movw R30,R0
	movw R16,R20
	mov R16,R17
	clr R17
	eor R16,R30
	eor R17,R31
	.dbline -2
L1:
	xcall pop_gset2
	.dbline 0 ; func end
	ret
	.dbsym r c 22 c
	.dbsym r fcs 20 s
	.dbend
	.dbfunc e UpdateFCS_32 _UpdateFCS_32 fl
;              f -> y+0
;              i -> R10
;              c -> y+14
;            fcs -> y+10
	.even
_UpdateFCS_32::
	xcall push_arg4
	xcall push_gset3
	sbiw R28,4
	.dbline -1
	.dbline 169
; }
; /*
; u16 UpdateFCS_16(u16 fcs, u8 c)
; {	// update the fcs - bit band method
; 	register u8	i, f;
; 
; 	f = (u8)(fcs >> 8);
; 
; 	fcs = (fcs & 0x00ff) ^ c;
; 
; 	for (i = 8; i > 0; i--)
; 	{
; 		if (fcs & 1)
; 		{
; 			fcs >>= 1;
; 			fcs ^= HDLCPolynomial;
; 		}
; 		else
; 	     	fcs >>= 1;
; 	}
; 
; 	return (fcs ^ f);
; }
; 
; void Make_FCS_Table_16()
; {	// Generate the FCS table in ram
; 	u8		i;
; 	u16		w;
; 	u32		dw;
; 
; 	for (w = 0; w < 256; w++)
; 	{
; 		dw = (u32)w;
; 		for (i = 8; i > 0; i--)
; 		{
; 			if (dw & 1)
; 				dw = (dw >> 1) ^ HDLCPolynomial;
; 			else
; 				dw >>= 1;
; 		}
; 		FCS_Table_16[w] = (u16)(dw & 0xffff);
; 	}
; }
; 
; u32 UpdateFCS_32(u32 fcs, u8 c)
; {
; 	return (fcs >> 8) ^ FCS_Table_32[(fcs & 0xff) ^ c];
; }
; */
; 
; u32 UpdateFCS_32(u32 fcs, u8 c)
; {	// update the fcs - bit band method
	.dbline 173
; 	register u8	i;
; 	u32			f;
; 
; 	f = fcs >> 8;
	ldi R24,8
	ldi R25,0
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	st -y,R24
	movw R16,R2
	movw R18,R4
	xcall lsr32
	movw R30,R28
	std z+0,R16
	std z+1,R17
	std z+2,R18
	std z+3,R19
	.dbline 175
; 
; 	fcs = (fcs & 0x000000ff) ^ (u32)c;
	ldi R20,255
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	and R2,R20
	and R3,R21
	and R4,R22
	and R5,R23
	ldd R6,y+14
	clr R7
	clr R8
	clr R9
	eor R2,R6
	eor R3,R7
	eor R4,R8
	eor R5,R9
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	.dbline 177
; 
; 	for (i = 8; i > 0; i--)
	ldi R24,8
	mov R10,R24
	xjmp L6
L3:
	.dbline 178
; 	{
	.dbline 179
; 		if (fcs & 1)
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	and R2,R20
	and R3,R21
	and R4,R22
	and R5,R23
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	cp R2,R20
	cpc R3,R21
	cpc R4,R22
	cpc R5,R23
	breq L7
	.dbline 180
; 		{
	.dbline 181
; 			fcs >>= 1;
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	lsr R5
	ror R4
	ror R3
	ror R2
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	.dbline 182
; 			fcs ^= ZModem_PolyNominal;
	ldi R20,32
	ldi R21,131
	ldi R22,184
	ldi R23,237
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	eor R2,R20
	eor R3,R21
	eor R4,R22
	eor R5,R23
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	.dbline 183
; 		}
	xjmp L8
L7:
	.dbline 185
; 		else
; 	     	fcs >>= 1;
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	lsr R5
	ror R4
	ror R3
	ror R2
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
L8:
	.dbline 186
L4:
	.dbline 177
	dec R10
L6:
	.dbline 177
	clr R2
	cp R2,R10
	brsh X0
	xjmp L3
X0:
	.dbline 188
; 	}
; 
; 	return fcs ^ f;
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	movw R30,R28
	ldd R6,z+10
	ldd R7,z+11
	ldd R8,z+12
	ldd R9,z+13
	eor R6,R2
	eor R7,R3
	eor R8,R4
	eor R9,R5
	movw R16,R6
	movw R18,R8
	.dbline -2
L2:
	adiw R28,4
	xcall pop_gset3
	adiw R28,4
	.dbline 0 ; func end
	ret
	.dbsym l f 0 l
	.dbsym r i 10 c
	.dbsym l c 14 c
	.dbsym l fcs 10 l
	.dbend