radioclock

#include <stdio.h>
#include "utils.h"

#include <stdint.h>

uint32_t parity(uint32_t v) {
    // Taken from: http://www.graphics.stanford.edu/~seander/bithacks.html#ParityParallel
    v ^= v >> 16;
    v ^= v >> 8;
    v ^= v >> 4;
    v &= 0xf;
    return (0x6996 >> v) & 1;
}

uint8_t crc8(uint8_t *ptr, uint8_t len) {
    uint8_t crc = 0xFF;
    while (len--) {
        crc ^= *ptr++;
        for (uint8_t i = 0; i < 8; i++) {
            if (crc & 0x80) {
                crc <<= 1;
                crc ^= 0x31;
            } else {
                crc <<= 1;
            }
        }
    }
    return crc;
}

const char* get_filename(const char* path) {
    size_t i = 0;
    size_t pos = 0;
    char* p = (char*)path;
    while (*p) {
        i++;
        if (*p == '/' || *p == '\\') {
            pos = i;
        }
        p++;
    }
    return path + pos;
}