求助STM32F207 TIM4输入捕获进不了中断

隋树 · 发表于 2019-3-3 16:16:25

用STM32F207 P8口作为输入捕获，一直进不了中断。把TIM_INT()换成TIM_PWMICONFIG()能进中断，但是读的数全是0.

#include "pwm.h"
#include "stm32f2xx_tim.h"
#include "stm32f2xx_rcc.h"

//PB8, TIM4 CH3,TIM10 CH1
//PB9, TIM4 CH4, TIM11 CH1
//PB10,TIM2 CH3
u32 up = 0;
u32 down = 0;
int status = 0;

void PWM_Int(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_ICInitTypeDef TIM_ICInitStruct;
NVIC_InitTypeDef NVIC_InitStruct;

// 1.打开时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//开不开这个好像没有用。
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

// 2.GPIO初始化

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);

// 3.引脚复用
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM4);

// 4.采样周期配置
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = 20;
TIM_TimeBaseInitStruct.TIM_Prescaler = 0x3fff;

TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStruct);

// 5.TIM配置
TIM_ICInitStruct.TIM_Channel = TIM_Channel_3;
TIM_ICInitStruct.TIM_ICFilter = 4;
TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInit(TIM4,&TIM_ICInitStruct);//这里换成TIM_PWMICONFIG能进中断

// 6.中断使能

TIM_ITConfig(TIM4, TIM_IT_CC3, ENABLE);

// 7.中断优先级设置
NVIC_InitStruct.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 2;

NVIC_Init(&NVIC_InitStruct);

// 8.使能TIM4
TIM_Cmd(TIM4, ENABLE);

}

void TIM4_IRQHandler(void)
{

if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET)
  {
if(status == 0)
{
   down = TIM_GetCapture3(TIM4);  //使用TIM_PWMICONFIG能进中断，但DEBUG，这个数一直是0.
   TIM_SetCounter(TIM4,0);
   status = 1;
   TIM_OC3PolarityConfig(TIM4, TIM_OCPolarity_Low);
}
if(status == 1)
{
   up = TIM_GetCapture3(TIM4);
   TIM_SetCounter(TIM4,0);
   status = 0;
   TIM_OC3PolarityConfig(TIM4, TIM_OCPolarity_High);
}
  }


  TIM_ClearITPendingBit(TIM4, TIM_IT_CC3); //???????
}

隋树 · 发表于 2019-3-3 16:16:26

全搞定了，一个TIM花了五天时间，碰到各种奇葩问题

隋树 · 发表于 2019-3-3 19:22:35

上面的问题被我解决了（虽然现在还很模糊怎么解决的），又出现新的问题了，用串口把读到的数打印出来。全是0，我用串口打印ox55，是没问题的。

#include "stm32f2xx_gpio.h"
#include "stm32f2xx_usart.h"
#include "usart.h"
#include "stm32f2xx.h"
#include "stm32f2xx_it.h"
#include "pwm.h"

extern u32 up;
extern u32 down;

int main()
{

u16 uph, upl, downh, downl;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
USART207_Int();
PWM_Int();
while(1)
{
static u16 i,j;
uph =(up>>8) & 0x00ff;
upl =up & 0x00ff;
downh = (down >>8) & 0x00ff;
downl = down & 0x00ff;
USART_SendData(UART5, uph);
while(USART_GetFlagStatus(UART5,USART_FLAG_TC )==RESET);
USART_SendData(UART5, upl);
while(USART_GetFlagStatus(UART5,USART_FLAG_TC )==RESET);
USART_SendData(UART5, downh);
while(USART_GetFlagStatus(UART5,USART_FLAG_TC )==RESET);
USART_SendData(UART5, downl);

for(i=0;i<5000;i++)
   for(j=0;j<240;j++);
for(i=0;i<5000;i++)
   for(j=0;j<240;j++);
}

}