限制hcsr04.c全局变量作用域
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#include "tim.h"
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// time 的单位是 μs
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uint64_t time; // 声明变量,用来计时
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uint64_t time_end; // 声明变量,存储回波信号时间
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uint8_t state = 1;
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static uint64_t time; // 声明变量,用来计时
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static uint64_t time_end; // 声明变量,存储回波信号时间
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static uint8_t state = 1;
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// HACK 临时的 delay 解决方法
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void delay_us(uint16_t us);
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