延时函数和定时函数举例，使用STM32F103C8T6芯片及库函数

延时函数的例子：

#include "stm32f10x.h"

void delay_ms(uint32_t ms) {
  for (uint32_t i = 0; i < ms; i++) {
    for (volatile uint32_t j = 0; j < 2000; j++); // 空循环延时
  }
}

int main(void) {
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  while (1) {
    GPIO_SetBits(GPIOC, GPIO_Pin_13);
    delay_ms(1000);
    GPIO_ResetBits(GPIOC, GPIO_Pin_13);
    delay_ms(1000);
  }
}

这是一个简单的通过空循环实现的延时函数。在主函数中，通过调用`delay_ms`函数来实现了LED的闪烁效果。

定时器函数的例子：

#include "stm32f10x.h"

void TIM2_IRQHandler(void) {
  if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    GPIO_WriteBit(GPIOC, GPIO_Pin_13, (BitAction)!(GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_13)));
  }
}

int main(void) {
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_TimeBaseStructure.TIM_Period = 9999;
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  TIM_Cmd(TIM2, ENABLE);

  NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  while (1) {
    // do something else
  }
}

这是一个通过定时器实现的LED闪烁效果。在主函数中，我们初始化了GPIO和TIM定时器，然后启动了TIM定时器。在中断函数`TIM2_IRQHandler`中，我们通过`GPIO_WriteBit`函数来实现LED的闪烁效果。