New CRC class example

CRC_example.cpp

#include "mbed.h"
#include "MbedCRC.h"
#include <iostream>     // std::cout
#include <limits>       // std::numeric_limits

int crc_sd_7bit() {
    MbedCRC<POLY_7BIT_SD, 7> ct;
    char  test[6];
    uint32_t crc;

    ct.init();
    test[0] = 0x40;
    test[1] = 0x00;
    test[2] = 0x00;
    test[3] = 0x00;
    test[4] = 0x00;
    
    ct.compute((void *)test, 5, &crc);    
    // CRC 7-bit as 8-bit data
    crc = crc + 1;
    printf("The CRC of 0x%lx \"CMD0\" is \"0x95\" Result: 0x%lx\n", 
                            ct.get_polynomial(), crc);

    test[0] = 0x48;
    test[1] = 0x00;
    test[2] = 0x00;
    test[3] = 0x01;
    test[4] = 0xAA;
    
    ct.compute((void *)test, 5, &crc);    
    // CRC 7-bit as 8-bit data
    crc = crc + 1;
    printf("The CRC of 0x%lx \"CMD8\" is \"0x87\" Result: 0x%lx\n", 
                            ct.get_polynomial(), crc);

    test[0] = 0x51;
    test[1] = 0x00;
    test[2] = 0x00;
    test[3] = 0x00;
    test[4] = 0x00;

    ct.compute((void *)test, 5, &crc);    
    // CRC 7-bit as 8-bit data
    crc = crc + 1;
    printf("The CRC of 0x%lx \"CMD17\" is \"0x55\" Result: 0x%lx\n", 
                            ct.get_polynomial(), crc);

    ct.deinit();
    return 0;
}

int crc_sd_16bit() {
    char test[512];
    uint32_t crc;
    MbedCRC<POLY_16BIT_CCITT, 16> sd(0, 0, false, false);
    
    memset(test, 0xFF, 512);
    // 512 bytes with 0xFF data --> CRC16 = 0x7FA1
    sd.init();
    sd.compute((void *)test, 512, &crc);
    printf("The 16BIT SD CRC of 512 bytes with 0xFF data is \"0x7FA1\" Result: 0x%lx\n", crc);
    sd.deinit();
    return 0;
}


int crc32_sample() {
    MbedCRC<POLY_32BIT_ANSI, 32> ct;

    char  test[] = "123456789";
    uint32_t crc = 0;

    ct.init();
    ct.compute((void *)test, strlen((const char*)test), &crc);
    printf("\nPolynomial = 0x%lx  Width = %d \n", ct.get_polynomial(), ct.get_width());    
    printf("The CRC of data \"123456789\" is : 0x%lx\n", crc);
    
    ct.compute_partial_start(&crc);
    ct.compute_partial((void *)&test, 4, &crc);
    ct.compute_partial((void *)&test[4], 5, &crc);
    ct.compute_partial_stop(&crc);    
    printf("The CRC of data \"123456789\" is : 0x%lx\n", crc);

    ct.deinit();
    return 0;
}

int main() {
    crc_sd_7bit();
    crc_sd_16bit();
    crc32_sample();
}