static uint32_t CRC_CalcBlockCRC(uint32_t *buffer, uint32_t words) {
cm_t crc_model;
uint32_t word_to_do;
unsigned char byte_to_do;
int i;
// Values for the STM32F generator.
crc_model.cm_width = 32; // 32-bit CRC
crc_model.cm_poly = 0x04C11DB7; // CRC-32 polynomial
crc_model.cm_init = 0xFFFFFFFF; // CRC initialized to 1's
crc_model.cm_refin = FALSE; // CRC calculated MSB first
crc_model.cm_refot = FALSE; // Final result is not bit-reversed
crc_model.cm_xorot = 0x00000000; // Final result XOR'ed with this
cm_ini(&crc_model);
while (words--)
{
// The STM32F10x hardware does 32-bit words at a time!!!
word_to_do = *buffer++;
// Do all bytes in the 32-bit word.
for (i = 0; i < sizeof(word_to_do); i++)
{
// We calculate a *byte* at a time. If the CRC is MSB first we
// do the next MS byte and vica-versa.
if (crc_model.cm_refin == FALSE)
{
// MSB first. Do the next MS byte.
byte_to_do = (unsigned char) ((word_to_do & 0xFF000000) >> 24);
word_to_do <<= 8;
}
else
{
// LSB first. Do the next LS byte.
byte_to_do = (unsigned char) (word_to_do & 0x000000FF);
word_to_do >>= 8;
}
cm_nxt(&crc_model, byte_to_do);
}
int
main(int argc, char **argv)
{
int i,x;
int refin,refout;
char string[20]="123456789";
char test1[38];
char test2[48];
cm_t crc32c,*p_crc32c,*p_cm;
u_int32_t crc;
refin = refout = 0;
if(argc < 3){
printf("Need args [TRUE/FALSE TRUE/FALSE]\n");
return(-1);
}
if((strcmp(argv[1],"true") == 0) ||
(strcmp(argv[1],"TRUE") == 0)){
refin = 1;
}
if((strcmp(argv[2],"true") == 0) ||
(strcmp(argv[2],"TRUE") == 0)){
refout = 1;
}
memset(test1,0,sizeof(test1));
memset(test2,0,sizeof(test2));
x = 1;
for(i=13;i<sizeof(test2);i++){
test2[i] = (char)x;
}
p_crc32c = &crc32c;
/*
CRC32-c
p_crc32c->cm_width = 32;
p_crc32c->cm_poly = 0x1EDC6F41;
p_crc32c->cm_init = 0xFFFFFFFF;
p_crc32c->cm_refin = refin;
p_crc32c->cm_refot = refout;
p_crc32c->cm_xorot = 0x00000000;
*/
/*
Name : "CRC-32"
Width : 32
Poly : 04C11DB7
Init : FFFFFFFF
RefIn : True
RefOut : True
XorOut : FFFFFFFF
Check : CBF43926
*/
p_crc32c->cm_width = 32;
p_crc32c->cm_poly = 0x04C11DB7;
p_crc32c->cm_init = 0xFFFFFFFF;
p_crc32c->cm_refin = refin;
p_crc32c->cm_refot = refout;
p_crc32c->cm_xorot = 0xFFFFFFFF;
cm_ini(p_crc32c);
p_cm = p_crc32c;
for(i=0;i<9;i++){
printf("%c",string[i]);
cm_nxt(p_cm,string[i]);
}
crc = cm_crc(p_cm);
printf("\ncrc value is %x\n",crc);
return(0);
}
