auto-reload preload
时间: 2023-04-13 13:04:36 浏览: 147
auto-reload preload是一种自动重新加载和预加载的技术,可以提高网站的性能和用户体验。当用户访问网站时,auto-reload preload会自动加载和预加载相关的资源,以便更快地响应用户请求。这种技术可以减少网站的加载时间和延迟,提高网站的可用性和可靠性。
相关问题
void pwm_capture_timer_config(void) { /* TIMER2 configuration: input capture mode ------------------- the external signal is connected to TIMER2 CH0 pin (PB4) the rising edge is used as active edge the TIMER2 CH0CV is used to compute the frequency value ------------------------------------------------------------ */ timer_ic_parameter_struct timer_icinitpara; timer_parameter_struct timer_initpara; rcu_periph_clock_enable(RCU_TIMER0); timer_deinit(TIMER0); /* TIMER1 configuration */ timer_initpara.prescaler = 119; timer_initpara.alignedmode = TIMER_COUNTER_EDGE; timer_initpara.counterdirection = TIMER_COUNTER_UP; timer_initpara.period = 65535; timer_initpara.clockdivision = TIMER_CKDIV_DIV1; timer_initpara.repetitioncounter = 0; timer_init(TIMER0,&timer_initpara); /* TIMER1 configuration */ /* TIMER1 CH2 input capture configuration */ timer_icinitpara.icpolarity = TIMER_IC_POLARITY_FALLING; timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI; timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1; timer_icinitpara.icfilter = 0x0; timer_input_capture_config(TIMER0,TIMER_CH_1,&timer_icinitpara); nvic_irq_enable(TIMER0_Channel_IRQn, 1, 1); timer_primary_output_config(TIMER0, ENABLE); /* auto-reload preload enable */ timer_auto_reload_shadow_enable(TIMER0); /* clear channel 0 interrupt bit */ timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH1); /* channel 0 interrupt enable */ timer_interrupt_enable(TIMER0,TIMER_INT_CH1); /* TIMER1 counter enable */ timer_enable(TIMER0); }
这是一个针对GD32F305芯片的定时器配置函数,主要是用于输入捕获模式。下面是代码的解释:
1. 开启TIMER0时钟
```
rcu_periph_clock_enable(RCU_TIMER0);
```
2. 复位TIMER0
```
timer_deinit(TIMER0);
```
3. 配置TIMER0的基本参数,包括计数器方向、计数器分频、计数器模式、计数器周期
```
timer_parameter_struct timer_initpara;
timer_initpara.prescaler = 119;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 65535;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);
```
4. 配置TIMER0的输入捕获通道,包括极性、输入捕获选择、预分频和滤波器参数
```
timer_ic_parameter_struct timer_icinitpara;
timer_icinitpara.icpolarity = TIMER_IC_POLARITY_FALLING;
timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
timer_icinitpara.icfilter = 0x0;
timer_input_capture_config(TIMER0,TIMER_CH_1,&timer_icinitpara);
```
5. 配置TIMER0的中断
```
nvic_irq_enable(TIMER0_Channel_IRQn, 1, 1);
timer_primary_output_config(TIMER0, ENABLE);
/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER0);
/* clear channel 0 interrupt bit */
timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH1);
/* channel 0 interrupt enable */
timer_interrupt_enable(TIMER0,TIMER_INT_CH1);
```
6. 开启TIMER0计数
```
timer_enable(TIMER0);
```
总体来说,这个函数的作用是配置TIMER0为输入捕获模式,其中TIMER0的计数器值会根据外部信号的变化而变化,以实现计时和计数等功能。其中的nvic_irq_enable函数是用于使能TIMER0的中断,timer_interrupt_enable函数是用于使能TIMER0的输入捕获通道中断。需要注意的是,这个函数只是一个配置函数,需要在调用时传入相应的参数才能实现具体的功能。
用库函数写一个STM32F429IGT6定时器3的代码
以下是使用库函数编写的定时器3代码:
```c
#include "stm32f429xx.h"
void TIM3_Init(void)
{
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN; // Enable TIM3 clock
// Configure TIM3
TIM3->PSC = 8399; // Set prescaler to get 10kHz counter clock
TIM3->ARR = 999; // Set auto-reload value to get 1s period
TIM3->CR1 |= TIM_CR1_ARPE; // Enable auto-reload preload
TIM3->DIER |= TIM_DIER_UIE; // Enable update interrupt
TIM3->CR1 |= TIM_CR1_CEN; // Enable TIM3 counter
NVIC_EnableIRQ(TIM3_IRQn); // Enable TIM3 interrupt in NVIC
}
void TIM3_IRQHandler(void)
{
if (TIM3->SR & TIM_SR_UIF) {
TIM3->SR &= ~TIM_SR_UIF; // Clear update interrupt flag
// Do something
}
}
int main(void)
{
TIM3_Init();
while (1) {
// Main loop
}
return 0;
}
```
在此代码中,我们使用了RCC_APB1ENR_TIM3EN宏来启用TIM3的时钟,并使用TIM3->PSC和TIM3->ARR寄存器来配置预分频器和自动重载值,以得到1秒的周期。我们还启用了自动重载预加载和更新中断,并在TIM3_IRQHandler函数中处理更新中断。最后,我们在main函数中调用TIM3_Init函数来初始化定时器3,并在主循环中等待。
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