1-20 · 有的单片机不支持uint64_t类型，无法运行calc_crc32函数和calc_crc32_inv函数。
注意到
if (temp & 0x8000000000000000)
    temp ^= POLYNOMIAL_CRC32 << 31;
temp <<= 1;
也就是
if (temp & 0x8000000000000000)
{...

1-20 · #include <stdint.h>
#include <stdio.h>
#include <string.h>
 
#define INIT_CRC32 0xffffffffull
#define POLYNOMIAL_CRC32 0x104c11db7ull
 
uint8_t invert(uint8_t data)
{
    int i;...

1-20 · 四个计算函数长得非常像，就只是里面的数字不一样。

1-20 · 程序运行结果：
len=0, crc7=0x00, crc8=0x00, crc16=0x0000, crc32=0x00000000
len=4, crc7=0x49, crc8=0x88, crc16=0x62d3, crc32=0x41e278d5
len=8, crc7=0x35, crc8=0x4f, crc16=0x90e6, crc32=0xe83f2f79
len=12, crc7=0x50, crc8=0x5c, crc16=0x9764, crc32=...

1-20 · /* CRC（循环冗余校验）在线计算: http://www.ip33.com/crc.html */
// 初始值INIT=0, 结果异或值XOROUT=0, 输入数据不反转, 输出数据不反转
#include <stdint.h>
#include <stdio.h>
#include <string.h>
 
#define POLYNOMIAL_CRC7 0x89ul
#define POLYNOMI...

1-20 · self-reliance
Definition:  (noun) Personal independence.  
Synonyms:  self-direction, self-sufficiency, autonomy  
Usage:  I should have thought you...

1-20 · The average American checks their phone over 140 times a day, clocking an average of 4.5 hours of daily use, with 57% of people...

1-20 · The original link: https://web.shanbay.com/reading/web-news/articles/bttsdl

1-20 · Before anything else, preparation is the key to success.

1-20 · 今天早上：06:59-08:48