RT-Thread如何打印uint64_t

在使用RT-Thread的过程中，发现RT-Thread用打印uint32_t的方法打印uint64_t会打印出异常值，花了比较长时间才找到正确的打印方法。
本文主要总结了RT-Thread打印uint64_t的代码。
 

    // u64 print test
    uint64_t value_u64 = 1672718939000000000;
    uint8_t tmp_u8[8];
    char tmp_str[100];
    // print1: hex in u8 one by one
    rt_kprintf("hex(msb): ");
    for (uint8_t i = 0; i < 8; i++) {
      tmp_u8[7 - i] = (value_u64 >> ((7 - i) * 8));
      rt_kprintf("%02x,", tmp_u8[7 - i]);
    }
    rt_kprintf("\r\n");

    // print2: u64 value directly
    sprintf(tmp_str, "%llu", value_u64);
    rt_kprintf("decimal(direct from value_u64): %s\r\n", tmp_str);

    // print3: u64 value cast from u8
    uint64_t value_cast_u64 = 0;
    for (uint8_t i = 0; i < 8; i++) {
      value_cast_u64 =
          value_cast_u64 | ((uint64_t)(tmp_u8[i] & 0xFF) << (i * 8));
      sprintf(tmp_str, "%llu(dec), 0x%016llx(hex)", value_cast_u64,
              value_cast_u64);
      rt_kprintf("value_cast_u64: %s\r\n", tmp_str);
    }
    rt_kprintf("\n");