for(i = 0;i < 11; i++) {u16CompareB = u16Counter; u16CompareB = 0x0bb8 - i*0x012c; Adt_SetCompareValue(enAdt, enAdtCompareB, u16CompareB); delay1ms(50); Adt_StartCount(enAdt); Adt_SetCompareValue(enAdt, enAdtCompareB, u16CompareB);// 添加退出条件判断 Adt_StartCount(enAdt); }把代码改成由亮到灭由灭到亮的变化
时间: 2024-04-15 17:31:57 浏览: 14
你可以通过修改循环的初始条件和步长来实现由亮到灭由灭到亮的变化。以下是修改后的代码示例:
```c
for(i = 10; i >= 0; i--)
{
u16CompareB = u16Counter;
u16CompareB = 0x0bb8 - i*0x012c;
Adt_SetCompareValue(enAdt, enAdtCompareB, u16CompareB);
delay1ms(50);
Adt_StartCount(enAdt);
Adt_SetCompareValue(enAdt, enAdtCompareB, u16CompareB); // 添加退出条件判断
Adt_StartCount(enAdt);
}
```
在这个修改后的代码中,循环的初始条件从0改为10,步长从递增改为递减。这样就可以实现由亮到灭由灭到亮的变化。
相关问题
for(i=0;i<10;i++);
There seems to be a syntax error in this code. The semicolon right after the condition in the for loop is causing an infinite loop as there is no code block to execute within the loop.
To fix it, we need to add some code to execute inside the for loop. For example, we could increment a counter variable i within the loop and print its value:
```
for (i = 0; i < 10; i++) {
console.log(i);
}
```
This will loop through the values of i from 0 to 9 and print each value to the console.
优化void delay_ms(u16 ms) { u16 i; for (i = 0; i < ms; i++) { u16 j; for (j = 0; j < 9000; j++) { __NOP(); } } }
使用循环来进行延时的方式并不是很精确,而且还会占用大量的CPU资源。因此,我们可以使用定时器来实现更加准确和高效的延时。
以下是使用定时器来实现延时的代码:
```
#include "delay.h"
void delay_init(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2时钟
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 999; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler = 71; //预分频值,72Mhz/72=1Mhz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //TIM2初始化
TIM_Cmd(TIM2, ENABLE); //使能TIM2
}
void delay_us(u32 us)
{
TIM_SetCounter(TIM2, 0); //清零计数器
while(TIM_GetCounter(TIM2) < us); //延时
}
void delay_ms(u16 ms)
{
while(ms--)
{
delay_us(1000); //每毫秒延时1000us
}
}
```
这段代码使用了STM32的定时器TIM2来实现延时。在初始化时,我们将TIM2的预分频值设置为71,这样计数器每计数一次就需要消耗1us的时间。然后在延时函数中,我们将计数器清零,然后通过while循环实现延时。由于定时器的计数精度很高,因此可以实现比较准确的延时。