超声波测距 定时器TimerValueGet()问题

超声波测距，PF4采用外部中断双边沿触发方式，再外部中断函数中改变标志，在主函数读取定时器的两次value，目前问题，测试用的PF4接的一个按键，注释掉readValue = TimerValueGet(TIMER0_BASE, TIMER_A);按键按下松开都可以进入外部中断，但是加上那句后只能进一次，然后程序就死了，读出来有数据，有没有遇到类似问题的啊，或者有没有超声波例程 – –

kai wang22：

程序附件在上边

xyz549040622：

/** main.c*/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include "driverlib/gpio.h"
#include "driverlib/sysctl.h"
#include "inc/hw_memmap.h"
#include "inc/hw_ints.h"
#include "LCDDriver.h"
#include "inc/hw_gpio.h"
#include "driverlib/timer.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"//uint32_t g_ui32Flags;
uint32_t g_ledFlag = 0;
uint32_t g_uartFlag = 0;
uint32_t ui32Period;
uint32_t g_showFlag = 0;
uint32_t readValue = 0;
uint32_t g_readFlag = 0;void timer0Config();void timer0Config()
{SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);ui32Period = (SysCtlClockGet());TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);IntEnable(INT_TIMER0A);TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);IntMasterEnable();TimerEnable(TIMER0_BASE, TIMER_A);
}
void timer1Config()
{SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);ui32Period = (SysCtlClockGet()/10);TimerLoadSet(TIMER1_BASE, TIMER_A, ui32Period -1);IntEnable(INT_TIMER1A);TimerIntEnable(TIMER1_BASE, TIMER_TIMA_TIMEOUT);IntMasterEnable();TimerEnable(TIMER1_BASE, TIMER_A);
}void PortFIntHandler(void)
{//清除中断标志GPIOIntClear(GPIO_PORTF_BASE, GPIO_PIN_4);//PF2低电平 关闭蓝色LED//g_uartFlag = 1;if(g_showFlag == 0){g_showFlag = 1;}else if(g_showFlag == 1){g_showFlag = 0;g_readFlag = 1;}}void
Timer0IntHandler(void)
{// Clear the timer interruptTimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);// Read the current state of the GPIO pin and// write back the opposite stateif(g_uartFlag == 0){GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);g_uartFlag = 1;}else if(g_uartFlag == 1){GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, GPIO_PIN_1);g_uartFlag = 2;}else if(g_uartFlag == 2){GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, 0);GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_PIN_3);g_uartFlag = 0;}}void
Timer1IntHandler(void)
{// Clear the timer interruptTimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT);// Read the current state of the GPIO pin andGPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, 0x01);SysCtlDelay(160/3); //延时10微秒GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, 0x00);//LCD_Draw_String("OK123", 2, 1, false);
}int main(void)
{char buf[10] = {0};//配置时钟SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |SYSCTL_XTAL_16MHZ);//	使能外设 所有外设操作前都要使能，否则会跳转到FaultISR()死循环SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);ui32Period = (SysCtlClockGet());//GPIO注册中断GPIOIntRegister(GPIO_PORTF_BASE, PortFIntHandler);//PF4作为中断输入源对应LaunchPad的按键1 SW1GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_4);//PF2配置为输出模式 对应LaunchPad的蓝色LEDGPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_0 | GPIO_PIN_3 | GPIO_PIN_2 | GPIO_PIN_1);//配置PF4为上拉电阻，输出电流能力2mAGPIOPadConfigSet(GPIO_PORTF_BASE,GPIO_PIN_4,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_STD_WPU);//终端类型为下降沿触发GPIOIntTypeSet(GPIO_PORTF_BASE, GPIO_PIN_4 , GPIO_BOTH_EDGES);//使能PF4中断GPIOIntEnable(GPIO_PORTF_BASE, GPIO_PIN_4);//全局中断IntMasterEnable();timer0Config();timer1Config();//PF2高电平 点亮蓝色LED//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3,GPIO_PIN_3);//timer配置LCD_Enable();// 使能LCDLCD_Init();// 初始化LCDLCD_ScreenClr();// 清屏//sprintf(buf, "%d", ui32Period);while(1){if(g_showFlag == 0){LCD_Draw_String("in", 4, 1, false);}else{LCD_Draw_String("out", 4, 1, false);}if(g_readFlag == 1){g_readFlag = 0;LCD_Draw_String("ab", 3, 1, false);readValue = TimerValueGet(TIMER0_BASE, TIMER_A);//sprintf(buf, "%d", readValue);}LCD_Draw_String("test", 1, 1, false);//LCD_Draw_String(buf, 3, 3, false);}
}

大概看了看你定时器的初始化，估计是你这里出错了。建议单独测试定时器部分。另外，应该是先初始化定时器，再开全局中断了吧。定时器中不要有延时。