From 7e21282dece5c2df76b9613d1c65a4522f3b9904 Mon Sep 17 00:00:00 2001 From: agelonch Date: Tue, 13 May 2014 13:31:08 +0200 Subject: [PATCH] Code CRC Reshaped to libLTE format --- lte/include/lte/fec/crc.h | 30 ++++++++- lte/lib/fec/src/crc.c | 117 ++++++++++++++++-------------------- lte/lib/fec/test/crc_test.c | 15 +++-- lte/lib/fec/test/crc_test.h | 2 + 4 files changed, 90 insertions(+), 74 deletions(-) diff --git a/lte/include/lte/fec/crc.h b/lte/include/lte/fec/crc.h index 010122973..dd9b58ef6 100644 --- a/lte/include/lte/fec/crc.h +++ b/lte/include/lte/fec/crc.h @@ -36,8 +36,34 @@ #define LTE_CRC8 0x19B -int init_crc(int lorder, unsigned long polynom); +#define _WITHMALLOC + +#ifndef _WITHMALLOC +#define MAX_LENGTH 1024*16 +#endif + +typedef struct { + unsigned long table[256]; +#ifdef _WITHMALLOC + unsigned char *data0; +#else + unsigned char data0[MAX_LENGTH]; +#endif + int polynom; + int order; + unsigned long crcinit; + unsigned long crcxor; + unsigned long crcmask; + unsigned long crchighbit; + unsigned int crc_out; +} crc_t; + +//ELIMINATE//////////////////// unsigned int crc(unsigned int crc, char *bufptr, int len, - int long_crc,unsigned int poly, int paste_word); + int long_crc, unsigned int poly, int paste_word); +/////////////////////////////// + +int crc_init(crc_t *crc_par); +unsigned int crc_attach(char *bufptr, int len, crc_t *crc_params); #endif diff --git a/lte/lib/fec/src/crc.c b/lte/lib/fec/src/crc.c index 3cbd1ad11..73c87d14d 100644 --- a/lte/lib/fec/src/crc.c +++ b/lte/lib/fec/src/crc.c @@ -31,116 +31,103 @@ #include #include "lte/utils/pack.h" -#define _WITHMALLOC +#include "lte/fec/crc.h" -unsigned int cword; -char *cdata; -const unsigned long crcinit = 0x00000000; //initial CRC value -const unsigned long crcxor = 0x00000000; //final XOR value -unsigned long crcmask; -unsigned long crchighbit; -unsigned long crctab[256]; +void gen_crc_table(crc_t *crc_params) { - - -void gen_crc_table(int lorder, unsigned long poly) { - - int i, j, ord=(lorder-8); + int i, j, ord=(crc_params->order-8); unsigned long bit, crc; for (i=0; i<256; i++) { crc = ((unsigned long)i)<crchighbit; crc<<= 1; - if (bit) crc^= poly; + if (bit) crc^= crc_params->polynom; } - crctab[i] = crc & crcmask; + crc_params->table[i]=crc & crc_params->crcmask; } } -unsigned long crctable (unsigned char* data, unsigned long length, int lorder) { +unsigned long crctable (unsigned long length, crc_t *crc_params) { - // Polynom lorders of 8, 16, 24 or 32. - unsigned long crc = crcinit; + // Polynom order 8, 16, 24 or 32 only. + int ord=crc_params->order-8; + unsigned long crc = crc_params->crcinit; + unsigned char* data = crc_params->data0; - while (length--) crc = (crc << 8) ^ crctab[ ((crc >> (lorder-8)) & 0xff) ^ *data++]; - - return((crc^crcxor)&crcmask); + while (length--){ + crc = (crc << 8) ^ crc_params->table[ ((crc >> (ord)) & 0xff) ^ *data++]; + } + return((crc ^ crc_params->crcxor) & crc_params->crcmask); } -unsigned long reversecrcbit(unsigned int crc, unsigned int polynom, int lorder, int nbits) { +unsigned long reversecrcbit(unsigned int crc, int nbits, crc_t *crc_params) { unsigned long m, rmask=0x1; for(m=0; m>1; + if((rmask & crc) == 0x01 )crc = (crc ^ crc_params->polynom)>>1; else crc = crc >> 1; } - return((crc^crcxor)&crcmask); + return((crc ^ crc_params->crcxor) & crc_params->crcmask); } -int init_crc(int lorder, unsigned long polynom){ - - unsigned long polyhighbit; +int crc_init(crc_t *crc_par){ // Compute bit masks for whole CRC and CRC high bit - crcmask = ((((unsigned long)1<<(lorder-1))-1)<<1)|1; - polyhighbit=0xFFFFFFFF ^ (crcmask+1); - crchighbit = (unsigned long)1<<(lorder-1); + crc_par->crcmask = ((((unsigned long)1<<(crc_par->order-1))-1)<<1)|1; + crc_par->crchighbit = (unsigned long)1<<(crc_par->order-1); - // Eliminate highest bit in polynom word - polynom=polynom & polyhighbit; + printf("crcmask=%x, crchightbit=%x\n", + (unsigned int)crc_par->crcmask, (unsigned int)crc_par->crchighbit); // check parameters - if (lorder < 1 || lorder > 32) { - printf("ERROR, invalid order, it must be between 1..32.\n"); + if (crc_par->order%8 != 0) { + printf("ERROR, invalid order=%d, it must be 8, 16, 24 or 32.\n", crc_par->order); return(0); } - if (lorder%8 != 0) { - printf("ERROR, invalid order=%d, it must be 8, 16, 24 or 32.\n", lorder); - return(0); - } - if (polynom != (polynom & crcmask)) { - printf("ERROR, invalid polynom.\n"); - return(0); - } - if (crcinit != (crcinit & crcmask)) { + + if (crc_par->crcinit != (crc_par->crcinit & crc_par->crcmask)) { printf("ERROR, invalid crcinit.\n"); return(0); } - if (crcxor != (crcxor & crcmask)) { + if (crc_par->crcxor != (crc_par->crcxor & crc_par->crcmask)) { printf("ERROR, invalid crcxor.\n"); return(0); } // generate lookup table - gen_crc_table(lorder, polynom); + gen_crc_table(crc_par); return(1); } -#define MAX_LENGTH 8192 - +///ELIMINATE////////////////////////// unsigned int crc(unsigned int crc, char *bufptr, int len, - int long_crc, unsigned int poly, int paste_word) { + int long_crc, unsigned int poly, int paste_word){ + return(0); +} +/////////////////////////////////////// + + + +unsigned int crc_attach(char *bufptr, int len, crc_t *crc_params) { int i, len8, res8, a; -#ifdef _WITHMALLOC - char *data0, *pter; + unsigned int crc; + char *pter; - data0 = (char *)malloc(sizeof(char) * (len+long_crc)*2); - if (!data0) { +#ifdef _WITHMALLOC + crc_params->data0 = (unsigned char *)malloc(sizeof(*crc_params->data0) * (len+crc_params->order)*2); + if (!crc_params->data0) { perror("malloc ERROR: Allocating memory for data pointer in crc() function"); return(-1); } -#endif -#ifndef _WITHMALLOC - char data0[MAX_LENGTH], *pter; - - if((((len+long_crc)>>3) + 1) > MAX_LENGTH){ +#else + if((((len+crc_params->order)>>3) + 1) > MAX_LENGTH){ printf("ERROR: Not enough memory allocated\n"); return(-1); } @@ -156,24 +143,22 @@ unsigned int crc(unsigned int crc, char *bufptr, int len, for(i=0; idata0[i]=(unsigned char)(unpack_bits(&pter, 8)&0xFF); } // Calculate CRC - pter=data0; - crc=crctable ((unsigned char *)pter, len8+a, long_crc); + crc=crctable(len8+a, crc_params); // Reverse CRC res8 positions - if(a==1)crc=reversecrcbit(crc, poly, long_crc, res8); + if(a==1)crc=reversecrcbit(crc, res8, crc_params); // Add CRC pter=(char *)(bufptr+len); - pack_bits(crc, &pter, long_crc); + pack_bits(crc, &pter, crc_params->order); #ifdef _WITHMALLOC - free(data0); - data0=NULL; + free(crc_params->data0); + crc_params->data0=NULL; #endif //Return CRC value return crc; } - diff --git a/lte/lib/fec/test/crc_test.c b/lte/lib/fec/test/crc_test.c index c1eeba49b..28c389002 100644 --- a/lte/lib/fec/test/crc_test.c +++ b/lte/lib/fec/test/crc_test.c @@ -77,6 +77,7 @@ int main(int argc, char **argv) { int i; char *data; unsigned int crc_word, expected_word; + crc_t crc_p; parse_args(argc, argv); @@ -96,22 +97,24 @@ int main(int argc, char **argv) { data[i] = rand()%2; } - //Initialize crc params and tables - if(!init_crc(crc_length, crc_poly))exit(0); + //Initialize CRC params and tables + crc_p.polynom=crc_poly; + crc_p.order=crc_length; + crc_p.crcinit=0x00000000; + crc_p.crcxor=0x00000000; + if(!crc_init(&crc_p))exit(0); // generate CRC word - crc_word = crc(0, data, num_bits, crc_length, crc_poly, 1); + crc_word = crc_attach(data, num_bits, &crc_p); // check if result is zero - if (crc(0, data, num_bits + crc_length, crc_length, crc_poly, 0)) { + if (crc_attach(data, num_bits + crc_length, &crc_p)) { printf("CRC check is non-zero\n"); exit(-1); } free(data); - printf("CRC word: 0x%x\n", crc_word); - // check if generated word is as expected if (get_expected_word(num_bits, crc_length, crc_poly, seed, &expected_word)) { fprintf(stderr, "Test parameters not defined in test_results.h\n"); diff --git a/lte/lib/fec/test/crc_test.h b/lte/lib/fec/test/crc_test.h index 164032b7b..54c7a8283 100644 --- a/lte/lib/fec/test/crc_test.h +++ b/lte/lib/fec/test/crc_test.h @@ -39,11 +39,13 @@ typedef struct { static expected_word_t expected_words[] = { +//ELIMINATE/////////// /* {5000, 24, LTE_CRC24A, 1, 0x4D0836}, // LTE CRC24A (36.212 Sec 5.1.1) {5000, 24, LTE_CRC24B, 1, 0x9B68F8}, // LTE CRC24B {5000, 16, LTE_CRC16, 1, 0xBFFA}, // LTE CRC16: 0xBFFA {5000, 8, LTE_CRC8, 1, 0xF8}, // LTE CRC8 0xF8 */ +////////////////////// {5001, 24, LTE_CRC24A, 1, 0x1C5C97}, // LTE CRC24A (36.212 Sec 5.1.1) {5001, 24, LTE_CRC24B, 1, 0x36D1F0}, // LTE CRC24B {5001, 16, LTE_CRC16, 1, 0x7FF4}, // LTE CRC16: 0x7FF4