修改随机数字符产生函数#6
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修改随机数字符产生函数
在生成随机数前面添加随机数种子，以TIM2计数器作为随机数种子，使随机数更随机一点。
（不能使用TIM1计数器，因为每次获取随机数的函数都是在TIM1回调里面执行的，所以几乎每次获取的计数值都是固定的）