请各位看下，我这用定时器的外部计数模式，各项都配置好了，就是读不出数据？着急

linhui · 发表于 2016-8-27 01:42:06

[mw_shl_code=c,true]#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "TIMER.h"

u32 CAPTURE1;

int main()
{

SystemInit();
gpio_init();
TIM3_Int_Init();

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置中断优先级分组
uart_init(115200);
delay_init();
LED_Init();

TIM3_Int_Init();

while(1)
{
CAPTURE1=(u32)TIM_GetCounter(TIM3);
printf("%d\n",CAPTURE1);

delay_ms(100);
}

}
[/mw_shl_code]

[mw_shl_code=c,true]#include "TIMER.h"
#include "led.h"
#include "usart.h"

void gpio_init(void)
{
GPIO_InitTypeDef gpioinit;
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD,ENABLE);

gpioinit.GPIO_Mode=GPIO_Mode_IPD;
gpioinit.GPIO_Pin=GPIO_Pin_2;
gpioinit.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOD,&gpioinit);

}

void TIM3_Int_Init(void)//配置为外部计数器
{

TIM_TimeBaseInitTypeDef tim3init;

RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM3,ENABLE);
TIM_DeInit(TIM3);
tim3init.TIM_ClockDivision=0x0;
tim3init.TIM_CounterMode=TIM_CounterMode_Up;
tim3init.TIM_Period=0xFFFF;
tim3init.TIM_Prescaler=0X00;

TIM_TimeBaseInit(TIM3,&tim3init);

TIM_ETRClockMode2Config(TIM3,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,0);

TIM_SetCounter(TIM3,0);

TIM_Cmd(TIM3,ENABLE);

}

[/mw_shl_code]