PamVMC/include/CRC.h

/****************************************************************************
 *  F i l e   D a t a                                                        
 *  $Id: CRC.h,v 1.1 2009-02-19 16:50:35 nikolas Exp $
 *  $Revision: 1.1 $ 
 *  $Date: 2009-02-19 16:50:35 $     
 *  $RCSfile: CRC.h,v $ 
 *                                                                           
 ****************************************************************************
 *  S W   D e v e l o p m e n t   E n v i r o n m e n t                      
 *                                                                           
 *  $Author: nikolas $                                                                   
 *               :                                                           
 *****************************************************************************/

#ifndef CRC_H
#define CRC_H

#define BYTE       unsigned char 
#define  UINT32 unsigned int 
#define  UINT16 unsigned short 

#include <iostream>
/**   Example of CAST macro at work. public domain demo by Bob Stout.
 *
 *       Example of CAST macro at work                                   
 *                                                                       
 *       union {                                                         
 *               char    ch[4];                                         
 *               int     i[2];                                           
 *       } my_union;                                                    
 *                                                                      
 *       long    longvar;                                                
 *                                                                       
 *               longvar = (long)my_union;        Illegal cast           
 *               longvar = CAST(long, my_union);  Legal cast             
 *                                                                       
 */
#define CM_CAST(new_type,old_object) (*((new_type *)&(old_object)))


#define CM_HI_UINT16(x) ( (BYTE)( ((x) & 0xff00)>>8 ) )
#define CM_LO_UINT16(x) ( (BYTE)( ((x) & 0x00ff) ) )

#define CM_HI_UINT32(x) ( (UINT16)( ((x) & 0xffff0000)>>16 ) )
#define CM_LO_UINT32(x) ( (UINT16)( ((x) & 0x0000ffff) ) )


#define CM_HIHI_UINT32(x) ( (BYTE)( ((x) & 0xff000000)>>24 ) )
#define CM_LOHI_UINT32(x) ( (BYTE)( ((x) & 0x00ff0000)>>16 ) )
#define CM_HILO_UINT32(x) ( (BYTE)( ((x) & 0x0000ff00)>> 8 ) )
#define CM_LOLO_UINT32(x) ( (BYTE)( ((x) & 0x000000ff)     ) )


/**
   Macro READ_NEXT_BITS_UINT(wordlen,p,offset,n,res)

   this mascro scans bits for a 'wordlen'-bit long word. 'wordlen' can be 8,16,32...
   It reads the next 'n' bits starting after the 'offset'-th bit of the 'wordlen'-bit word pointed by p.
   store the result in 'res', and increment properly both 'offset' and 'p' such that they can be reused
   in the text invocation of the macro.

     \a p        unsigned 'wordlen'-bit pointer (ie. wordlen==16, then unsinged short int * in i386 arch) 
              varibale name.
              it points to the word to scan. it is incremented automatically by the macro.
     \a offset   unsigned  8 bit variable name (unsigned char?). Must be an l-value.
              it holds the number of bit already read in the most significant part of the
              current pointer (*p). Should be used always the same variable while a scanning
              session. This value must be initialized to zero and should be always less then 'wordlen'.
     \a n        the number of bits to read. Can be a r-value. Must be   0 <= n <= 'wordlen'. 
              if n is zero (senseless), both 'p' and 'offset' are unchanged and 0 is returned in 'res'.
     \a res      unsigned 'wordlen'-bit variable name (i.e wordlen==16, then unsigned short int? on i386 arch)
              in which to store the requested 'n' bits.
              they are returned in the less significat part of 'res'. If n<'wordlen', then the most
              significant bits of 'res' are padded to zero.
   
   before using he macro the first time you have to: (let's assume 'wordlen' fixed to 16 and an i386 arch.)
     1) choose an unsigned short pointer to pass as 'p', and initialize it to the sequence 
        of bits to scan from.
     2) choose an unsigned  char variable to pass as 'offset' and initialize it to zero 
        (or some other value X<16, if you want to skip the first X bits)
     3) choose an unsigned short to return the result.
     
*/

#define CM_READ_NEXT_BITS_UINT(wordlen,p,offset,n,res) \
do {                                     \
    res = (*p << offset);                \
    res >>= (wordlen-(n));               \
    if(n<=wordlen-offset) {              \
      offset=(offset+(n))%wordlen;       \
      if(offset==0)                      \
         p++;                            \
    }else{                               \
      p++;                               \
      res |= *p>>(wordlen*2-offset-(n)); \
      offset+=(n)-wordlen;               \
    }                                    \
}while(0)

/* Wrapper to 8,16,32,64 bit link wrapper to READ_NEXT_BITS_UINT : */
#define CM_READ_NEXT_BITS_UINT8(p,offset,n,res)  CM_READ_NEXT_BITS_UINT(8 ,p,offset,n,res)
#define CM_READ_NEXT_BITS_UINT16(p,offset,n,res) CM_READ_NEXT_BITS_UINT(16,p,offset,n,res)
#define CM_READ_NEXT_BITS_UINT32(p,offset,n,res) CM_READ_NEXT_BITS_UINT(32,p,offset,n,res)
#define CM_READ_NEXT_BITS_UINT64(p,offset,n,res) CM_READ_NEXT_BITS_UINT(64,p,offset,n,res)

#define CM_GET_BIT(exp,n) (((exp) >> ((n)-1)) & 0x1)


/* Thees macros write a 16 or 32 bits in BigEndian fascion in a (unsigned char*) avoiding the
   addressing alignement problem and also increment ptr
     - ptr    must be a (unsigned char*) pointer (l-value)
     - byte   must be a (unsigned char)          (r-value)
     - word   must be a (unsigned short int)     (r-value)
     - dword  must be a (unsigned int)           (r-value)
 */
#define CM_WRITE_BE_UINT8(ptr,byte) do { *ptr = (unsigned char)(byte); ptr++;} while(0)

#define CM_WRITE_BE_UINT16(ptr,word) do { \
  CM_WRITE_BE_UINT8(ptr,((word)>>8)); \
  CM_WRITE_BE_UINT8(ptr,(word)); \
} while(0)

#define CM_WRITE_BE_UINT32(ptr,dword) do { \
  CM_WRITE_BE_UINT8(ptr,(dword)>>24); \
  CM_WRITE_BE_UINT8(ptr,(dword)>>16); \
  CM_WRITE_BE_UINT8(ptr,(dword)>>8); \
  CM_WRITE_BE_UINT8(ptr,(dword));      \
} while(0)

/* Thees macros read a 16 or 32 bits in BigEndian fascion from a (unsigned char*) avoiding the
   addressing alignement problem and also increment ptr
     - ptr    must be a (unsigned char*) pointer (l-value)
     - byte and temp   must be a (unsigned char)          (l-value)
     - word   must be a (unsigned short int)     (l-value)
     - dword  must be a (unsigned int)           (l-value)
 */
#define CM_READ_BE_UINT8(ptr,byte) do { byte = *(ptr); (ptr)++; } while(0)

#define CM_READ_BE_UINT16(ptr,word,temp) do { \
  CM_READ_BE_UINT8(ptr,temp);             \
  word = ((unsigned short int)temp) << 8; \
  CM_READ_BE_UINT8(ptr,temp);             \
  word |= temp;                            \
} while(0)

#define CM_READ_BE_UINT32(ptr,word,temp) do { \
  CM_READ_BE_UINT8(ptr,temp);         \
  word =  ((unsigned int)temp) << 24;  \
  CM_READ_BE_UINT8(ptr,temp);         \
  word |= ((unsigned int)temp) << 16;  \
  CM_READ_BE_UINT8(ptr,temp);         \
  word |= ((unsigned int)temp) <<  8;  \
  CM_READ_BE_UINT8(ptr,temp);         \
  word |= ((unsigned int)temp);        \
} while(0)


/** Univeral BIT converter to 2 registers set with different resolution.
    Used in Microsecond to register converte for data time out and event time
    out and other same-style register.
    
    \a v        is the value in some unit
    \a unit_h   is the resolution of the MSD-part. must be in same unit of v.
    \a no_bit_h is the number of bits of the MSD-part.
    \a unit_l   is the resolution of the LSD-part. must be in same unit of v.
    \a no_bit_l is the number of bits of the LSD-part.
    
    \example (case of ETO)
    Suppose to have 2 8-bit registers ETO1 (8 bit,LSB) and ETO2 (8 bit,HSB): 
    ETO2 have a resoluion of 65 microsec;
    ETOHSB have a resolution of 16 millisec;

    This will format a value of 1 millisecond (unit is in microsecond)
    the usage is: CM_TIME2REG(1000,16*1000,8,65,8)

 */

//#define CM_TIME2REG(v,unit_h,no_bit_h,unit_l,no_bit_l) ((((v)/(unit_h))<<(no_bit_l) ) | ((((v)%(unit_h))/(unit_l)) & ~((0xffffffff)<<((no_bit_l)+(no_bit_h)))))

//#define CM_INT_UNUSED 0


/**
   Compute a 8 bit CRC based on a \a data, whith a \a old pre-computed crc.   
 */
/** old   ---> the old pre-computed crc */
/** data ---> the data to compute crc for */
BYTE CM_crc8_8(BYTE old, BYTE data);

UINT32 CM_Compute_CRC8_8(UINT32 oldcrc
                         ,BYTE *buffer 
                         ,UINT32 length 
                         );


UINT16 CM_CRC16(BYTE* adrs, UINT16 Crc);
UINT16 CM_Compute_CRC16(UINT16 oldcrc,BYTE *buffer,UINT32 length);

BYTE* charToUnsignedChar(char buffer[], UINT32 length);


#endif /* CRC_H */


1	/****************************************************************************
2	* F i l e D a t a
3	* $Id: CRC.h,v 1.1 2009-02-19 16:50:35 nikolas Exp $
4	* $Revision: 1.1 $
5	* $Date: 2009-02-19 16:50:35 $
6	* $RCSfile: CRC.h,v $
7	*
8	****************************************************************************
9	* S W D e v e l o p m e n t E n v i r o n m e n t
10	*
11	* $Author: nikolas $
12	* :
13	*****************************************************************************/
14
15	#ifndef CRC_H
16	#define CRC_H
17
18	#define BYTE unsigned char
19	#define UINT32 unsigned int
20	#define UINT16 unsigned short
21
22	#include <iostream>
23	/** Example of CAST macro at work. public domain demo by Bob Stout.
24	*
25	* Example of CAST macro at work
26	*
27	* union {
28	* char ch[4];
29	* int i[2];
30	* } my_union;
31	*
32	* long longvar;
33	*
34	* longvar = (long)my_union; Illegal cast
35	* longvar = CAST(long, my_union); Legal cast
36	*
37	*/
38	#define CM_CAST(new_type,old_object) (((new_type )&(old_object)))
39
40
41	#define CM_HI_UINT16(x) ( (BYTE)( ((x) & 0xff00)>>8 ) )
42	#define CM_LO_UINT16(x) ( (BYTE)( ((x) & 0x00ff) ) )
43
44	#define CM_HI_UINT32(x) ( (UINT16)( ((x) & 0xffff0000)>>16 ) )
45	#define CM_LO_UINT32(x) ( (UINT16)( ((x) & 0x0000ffff) ) )
46
47
48	#define CM_HIHI_UINT32(x) ( (BYTE)( ((x) & 0xff000000)>>24 ) )
49	#define CM_LOHI_UINT32(x) ( (BYTE)( ((x) & 0x00ff0000)>>16 ) )
50	#define CM_HILO_UINT32(x) ( (BYTE)( ((x) & 0x0000ff00)>> 8 ) )
51	#define CM_LOLO_UINT32(x) ( (BYTE)( ((x) & 0x000000ff) ) )
52
53
54
55	/**
56	Macro READ_NEXT_BITS_UINT(wordlen,p,offset,n,res)
57
58	this mascro scans bits for a 'wordlen'-bit long word. 'wordlen' can be 8,16,32...
59	It reads the next 'n' bits starting after the 'offset'-th bit of the 'wordlen'-bit word pointed by p.
60	store the result in 'res', and increment properly both 'offset' and 'p' such that they can be reused
61	in the text invocation of the macro.
62
63	\a p unsigned 'wordlen'-bit pointer (ie. wordlen==16, then unsinged short int * in i386 arch)
64	varibale name.
65	it points to the word to scan. it is incremented automatically by the macro.
66	\a offset unsigned 8 bit variable name (unsigned char?). Must be an l-value.
67	it holds the number of bit already read in the most significant part of the
68	current pointer (*p). Should be used always the same variable while a scanning
69	session. This value must be initialized to zero and should be always less then 'wordlen'.
70	\a n the number of bits to read. Can be a r-value. Must be 0 <= n <= 'wordlen'.
71	if n is zero (senseless), both 'p' and 'offset' are unchanged and 0 is returned in 'res'.
72	\a res unsigned 'wordlen'-bit variable name (i.e wordlen==16, then unsigned short int? on i386 arch)
73	in which to store the requested 'n' bits.
74	they are returned in the less significat part of 'res'. If n<'wordlen', then the most
75	significant bits of 'res' are padded to zero.
76
77	before using he macro the first time you have to: (let's assume 'wordlen' fixed to 16 and an i386 arch.)
78	1) choose an unsigned short pointer to pass as 'p', and initialize it to the sequence
79	of bits to scan from.
80	2) choose an unsigned char variable to pass as 'offset' and initialize it to zero
81	(or some other value X<16, if you want to skip the first X bits)
82	3) choose an unsigned short to return the result.
83
84	*/
85
86	#define CM_READ_NEXT_BITS_UINT(wordlen,p,offset,n,res) \
87	do { \
88	res = (*p << offset); \
89	res >>= (wordlen-(n)); \
90	if(n<=wordlen-offset) { \
91	offset=(offset+(n))%wordlen; \
92	if(offset==0) \
93	p++; \
94	}else{ \
95	p++; \
96	res \|= p>>(wordlen2-offset-(n)); \
97	offset+=(n)-wordlen; \
98	} \
99	}while(0)
100
101	/* Wrapper to 8,16,32,64 bit link wrapper to READ_NEXT_BITS_UINT : */
102	#define CM_READ_NEXT_BITS_UINT8(p,offset,n,res) CM_READ_NEXT_BITS_UINT(8 ,p,offset,n,res)
103	#define CM_READ_NEXT_BITS_UINT16(p,offset,n,res) CM_READ_NEXT_BITS_UINT(16,p,offset,n,res)
104	#define CM_READ_NEXT_BITS_UINT32(p,offset,n,res) CM_READ_NEXT_BITS_UINT(32,p,offset,n,res)
105	#define CM_READ_NEXT_BITS_UINT64(p,offset,n,res) CM_READ_NEXT_BITS_UINT(64,p,offset,n,res)
106
107	#define CM_GET_BIT(exp,n) (((exp) >> ((n)-1)) & 0x1)
108
109
110
111
112	/* Thees macros write a 16 or 32 bits in BigEndian fascion in a (unsigned char*) avoiding the
113	addressing alignement problem and also increment ptr
114	- ptr must be a (unsigned char*) pointer (l-value)
115	- byte must be a (unsigned char) (r-value)
116	- word must be a (unsigned short int) (r-value)
117	- dword must be a (unsigned int) (r-value)
118	*/
119	#define CM_WRITE_BE_UINT8(ptr,byte) do { *ptr = (unsigned char)(byte); ptr++;} while(0)
120
121	#define CM_WRITE_BE_UINT16(ptr,word) do { \
122	CM_WRITE_BE_UINT8(ptr,((word)>>8)); \
123	CM_WRITE_BE_UINT8(ptr,(word)); \
124	} while(0)
125
126	#define CM_WRITE_BE_UINT32(ptr,dword) do { \
127	CM_WRITE_BE_UINT8(ptr,(dword)>>24); \
128	CM_WRITE_BE_UINT8(ptr,(dword)>>16); \
129	CM_WRITE_BE_UINT8(ptr,(dword)>>8); \
130	CM_WRITE_BE_UINT8(ptr,(dword)); \
131	} while(0)
132
133	/* Thees macros read a 16 or 32 bits in BigEndian fascion from a (unsigned char*) avoiding the
134	addressing alignement problem and also increment ptr
135	- ptr must be a (unsigned char*) pointer (l-value)
136	- byte and temp must be a (unsigned char) (l-value)
137	- word must be a (unsigned short int) (l-value)
138	- dword must be a (unsigned int) (l-value)
139	*/
140	#define CM_READ_BE_UINT8(ptr,byte) do { byte = *(ptr); (ptr)++; } while(0)
141
142	#define CM_READ_BE_UINT16(ptr,word,temp) do { \
143	CM_READ_BE_UINT8(ptr,temp); \
144	word = ((unsigned short int)temp) << 8; \
145	CM_READ_BE_UINT8(ptr,temp); \
146	word \|= temp; \
147	} while(0)
148
149	#define CM_READ_BE_UINT32(ptr,word,temp) do { \
150	CM_READ_BE_UINT8(ptr,temp); \
151	word = ((unsigned int)temp) << 24; \
152	CM_READ_BE_UINT8(ptr,temp); \
153	word \|= ((unsigned int)temp) << 16; \
154	CM_READ_BE_UINT8(ptr,temp); \
155	word \|= ((unsigned int)temp) << 8; \
156	CM_READ_BE_UINT8(ptr,temp); \
157	word \|= ((unsigned int)temp); \
158	} while(0)
159
160
161	/** Univeral BIT converter to 2 registers set with different resolution.
162	Used in Microsecond to register converte for data time out and event time
163	out and other same-style register.
164
165	\a v is the value in some unit
166	\a unit_h is the resolution of the MSD-part. must be in same unit of v.
167	\a no_bit_h is the number of bits of the MSD-part.
168	\a unit_l is the resolution of the LSD-part. must be in same unit of v.
169	\a no_bit_l is the number of bits of the LSD-part.
170
171	\example (case of ETO)
172	Suppose to have 2 8-bit registers ETO1 (8 bit,LSB) and ETO2 (8 bit,HSB):
173	ETO2 have a resoluion of 65 microsec;
174	ETOHSB have a resolution of 16 millisec;
175
176	This will format a value of 1 millisecond (unit is in microsecond)
177	the usage is: CM_TIME2REG(1000,16*1000,8,65,8)
178
179	*/
180
181	//#define CM_TIME2REG(v,unit_h,no_bit_h,unit_l,no_bit_l) ((((v)/(unit_h))<<(no_bit_l) ) \| ((((v)%(unit_h))/(unit_l)) & ~((0xffffffff)<<((no_bit_l)+(no_bit_h)))))
182
183	//#define CM_INT_UNUSED 0
184
185
186	/**
187	Compute a 8 bit CRC based on a \a data, whith a \a old pre-computed crc.
188	*/
189	/** old ---> the old pre-computed crc */
190	/** data ---> the data to compute crc for */
191	BYTE CM_crc8_8(BYTE old, BYTE data);
192
193	UINT32 CM_Compute_CRC8_8(UINT32 oldcrc
194	,BYTE *buffer
195	,UINT32 length
196	);
197
198
199	UINT16 CM_CRC16(BYTE* adrs, UINT16 Crc);
200	UINT16 CM_Compute_CRC16(UINT16 oldcrc,BYTE *buffer,UINT32 length);
201
202	BYTE* charToUnsignedChar(char buffer[], UINT32 length);
203
204
205
206
207
208
209	#endif /* CRC_H */
210
211
212