警告:对于“长”类型，整数常量太大

I have the following code.

我有以下代码。

  uint32_t reg_val = 0;
  uint64_t val = 0;
  reg_val = 0;
  reg_val = ((val & 0xffffff000000) >> 24);
  dev_write(rw,reg_val);
  uint32