STM32定时器溢出模式设置

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环境：主机:WIN7
开发环境:MDK4.23 MCU:STM32F103CBT6

源代码1:
说明:定时器采用TIM2,时钟源为内部8M晶振,向上溢出模式.此定时器用在延时函数,最小可以延时1us,故没有采用中断形式定时. 初始化代码:
[cpp] view plaincopy
1. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); 2. //重新将Timer设置为缺省值 3. TIM_DeInit(TIM2);
4. //采用内部时钟给TIM2提供时钟源 5. TIM_InternalClockConfig(TIM2); 6.
7. timInitStruct.TIM_ClockDivision = TIM_CKD_DIV2; //定时器
基准频率8MHz
8. timInitStruct.TIM_Prescaler = 8 - 1; //计数频
率为1us跳转1次
9. timInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //向上计
数
10. timInitStruct.TIM_RepetitionCounter = 0;

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11. timInitStruct.TIM_Period = 0; //这个值
实际上就是TIMX->ARR，延时开始时重新设定即可 12.
13. TIM_TimeBaseInit(TIM2, &timInitStruct);
14. TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); //计数溢
出时触发中断
15. TIM_Cmd(TIM2, ENABLE); //开启计
数器

延时函数代码:
[cpp] view plaincopy
1. //延时1us 2. //最大65536us
3. void _delay_us(uint16_t t) 4. {
5. TIM_SetCounter(TIM2,0); 6. TIM_SetAutoreload(TIM2,t - 1); 7. //等待时间到
8. while (TIM_GetITStatus(TIM2,TIM_FLAG_Update) == 0); 9. //停止计数
10. TIM_SetAutoreload(TIM2,0); 11. //清中断标志
12. TIM_ClearITPendingBit(TIM2,TIM_FLAG_Update); 13. } 14.
15. //延迟1ms 16. //最大65ms
17. void _delay_ms(uint8_t t) 18. { 19.
20. if (t > 65) 21. {
22. t = 65; 23. }
24. _delay_us(t * 1000); 25. }

源代码2:

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说明:定时器采用TIM3,时钟源为内部8M晶振,向上溢出模式.此定时器用在长时间计时,最小计时间隔为100us,故采用中断形式定时. 初始化代码:
[cpp] view plaincopy
1. //中断NVIC设置：允许中断，设置优先级
2. NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
3. NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //更新事
件
4. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优
先级0
5. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优
先级1
6. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //允许中
断
7. NVIC_Init(&NVIC_InitStructure); //写入设
置 8.
9. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); 10. //重新将Timer设置为缺省值 11. TIM_DeInit(TIM3);
12. //采用内部时钟给TIM3提供时钟源 13. TIM_InternalClockConfig(TIM3); 14.
15. timInitStruct.TIM_ClockDivision = TIM_CKD_DIV2; //定时器
基准频率8MHz
16. timInitStruct.TIM_Prescaler = 800 - 1; //计数频
率为100us跳转1次
17. timInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //向上计
数
18. timInitStruct.TIM_RepetitionCounter = 0;
19. timInitStruct.TIM_Period = 0; //这个值
实际上就是TIMX->ARR，延时开始时重新设定即可 20.
21. TIM_TimeBaseInit(TIM3, &timInitStruct); 22. //清溢出中断标志
23. TIM_ClearFlag(TIM3, TIM_FLAG_Update); 24. //禁止ARR预装载缓冲器

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