void DelayUs() { _nop_(); _nop_(); _nop_(); _nop_(); } void DelayX(unsigned int x) { while (--x); } void DelayMs(unsigned int k) { unsigned int i,j; for(i=0;i<k;i++) { for(j=0;j<121;j++) {;} } }检查代码是否有缺少或错误
时间: 2024-04-26 17:25:00 浏览: 43
根据代码的逻辑和语法,没有明显的缺少或错误。但是需要注意的是,DelayMs() 函数中的延时时间是固定的,可能会因为不同的芯片或系统频率而导致延时时间不准确。建议使用定时器或其他精确的延时方式来实现精确的延时。此外,DelayUs() 函数中没有传入延时时间的参数,可能会导致无法实现预期的延时效果。
相关问题
void HC_SR04_Delayus(uint32_t usdelay) { __IO uint32_t Delay = usdelay * (SystemCoreClock / 8U /1000U/1000);//SystemCoreClock:系统频率 do { __NOP(); } while (Delay --); }
这段代码是用来实现一个微秒级别的延时函数。根据传入的延时时间(以微秒为单位),通过计算得到需要循环的次数,然后在循环中执行空操作(NOP)来实现延时。具体的计算方式是将传入的微秒数乘以系统时钟频率,然后除以8再除以1000再除以1000,得到需要循环的次数。在循环中每次循环都会执行一条空操作,直到循环次数减到0为止,从而实现了指定的延时时间。
void DelayUs(unsigned char Time) { unsigned char a; for(a=0;a<Time;a++) { NOP(); } }
As an AI language model, I cannot comment on the functionality of a code without knowing the context and purpose of the code. However, I can explain what this code does.
This code defines a function named DelayUs that takes an unsigned character Time as input. The function has a loop that runs from 0 to Time - 1. Inside the loop, there is a single instruction NOP() which does nothing. The purpose of this function is to introduce a delay of Time microseconds. The exact duration of the delay depends on the clock speed of the microcontroller and the number of NOP() instructions executed.
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