STM32的TIMER做外部计数用途

2万 · 2008-4-1 20:29

我用Timer数数，数外面的IO口上来了多少个脉冲
一直没有搞定，高手出手帮个忙

    TIM_ICStructInit(&TIM_ICInitStructure);
    TIM_ICInitStructure.TIM_ICMode = TIM_ICMode_ICAP;
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0;
    TIM_ICInit(TIM3, &TIM_ICInitStructure);

2万 · 2008-4-1 20:50

Figure 73. General-purpose timer block diagram

仔细看文档，看来只看FWLibray资料扫盲速成可以，真要用还得靠“Reference manua”

1万 · 2008-4-1 21:08

如果外部脉冲很快的话，最好使用外部时钟模式；如果外部脉冲不是很快，可以考虑用外部中断并软件计数的办法。

2万 · 2008-4-1 22:27

举一反三不会，举一反二总可以吧

2万 · 2008-4-4 23:39

2万 · 2008-4-5 01:48

--------------设置------------------------
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3, ENABLE);

    // Time base configuration
    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
--------------测试---------------------------------------

    TIM_SetCounter(TIM2, 0);
    TIM_Cmd(TIM2, ENABLE);

    for(i=0;i<0xA000;i++)
    {
        nRes = TIM_GetCounter(TIM2);
        GPIO_SetBits(GPIOD, GPIO_Pin_0);
        Delay(1);
        GPIO_ResetBits(GPIOD, GPIO_Pin_0);
        Delay(1);
    }

只看该作者 · 2010-10-15 16:13

6# McuPlayer
你好能不能把你的工程发我看看，我自己也写了，可是实际就是不计数

RCC_Configuration(); // System Clocks Configuration
NVIC_Configuration(); // NVIC configuration
GPIO_Configuration(); // Configure the GPIO ports

TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_ClockDivision =0x00;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // Time base configuration
TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_SetCounter(TIM2, 0);
TIM_Cmd(TIM2, ENABLE);
for(i=0;i<1000;i++)
{
n = TIM_GetCounter(TIM2);
Delay(10);
}