读取引脚状态函数会触发中断响应问题

使用zedboard开发板，做GPIO中断触发实验

功能：按键BTN8（MIO50）触发中断，运行中断函数。

完成：中断初始化；中断函数

实现：出现问题，在读取按键状态时直接触发中断。

出现问题位置

解决状态：NONE

#include 
#include "xparameters.h"
#include "xgpiops.h"
#include "xstatus.h"
#include "xplatform_info.h"
#include 
#include "sleep.h"
#include "xscugic.h"


#define GPIO_DEVICE_ID		XPAR_XGPIOPS_0_DEVICE_ID
#define INTC_DEVICE_ID		XPAR_SCUGIC_SINGLE_DEVICE_ID
#define MIO7_LED            7    //ps端LED
#define	MIO50_KEY           50    //按键

//GPIO中段号：52
#define GPIO_INTERRUPT_ID	XPAR_XGPIOPS_0_INTR

static u32 Input_Pin; /* Switch button */
static u32 Output_Pin; /* LED button */
static u32 AllButtonsPressed; /* Intr status of the bank */

XGpioPs_Config *ConfigPtr;
XScuGic_Config *IntcConfig; /* Instance of the interrupt controller */
XGpioPs Gpio;	/* The driver instance for GPIO Device. */
static XScuGic Intc; /* The Instance of the Interrupt Controller Driver */

void SetupInterruptSystem(XScuGic *GicInstancePtr, XGpioPs *Gpio, u16 GpioIntrId);
void IntrHandler();

int main()
{
	u32 Data;

	printf("***hello,hello,hello,hello,hello,hello***\r\n");
	//初始化gpio驱动
	//根据器件id，查找器件配置信息
	ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);
	//初始化gpio参数
	XGpioPs_CfgInitialize(&Gpio, ConfigPtr, ConfigPtr->BaseAddr);

	//gpio方向设置为输出（0：输入、1：输出）
	XGpioPs_SetDirectionPin(&Gpio, MIO7_LED, 1);
	XGpioPs_SetDirectionPin(&Gpio, MIO50_KEY, 0);

	//设置输出使能（0：关闭、1：打开）
	XGpioPs_SetOutputEnablePin(&Gpio, MIO7_LED, 1);

	SetupInterruptSystem(&Intc, &Gpio, GPIO_INTERRUPT_ID);

while(1)
{
	Data = XGpioPs_ReadPin(&Gpio, MIO50_KEY);
	if(Data == 1)
	{
	//写数据到输出引脚
		XGpioPs_WritePin(&Gpio, MIO7_LED, 0x1);

	}
	else
	{

		XGpioPs_WritePin(&Gpio, MIO7_LED, 0x0);
	}
}
	return 0;
}



void SetupInterruptSystem(XScuGic *GicInstancePtr, XGpioPs *Gpio,
				u16 GpioIntrId)
{

	//查找器件配置信息，并进行初始化
	IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);
	XScuGic_CfgInitialize(GicInstancePtr, IntcConfig, IntcConfig->CpuBaseAddress);

//	初始化ARM处理器异常句柄
	Xil_ExceptionInit();
//	给中断异常注册一个处理程序
	Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
				(Xil_ExceptionHandler)XScuGic_InterruptHandler,
				GicInstancePtr);

	/* Enable interrupts in the Processor.使能处理器中断 */
	Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ);

//	关联   中断处理函数，对中断进行处理
	XScuGic_Connect(GicInstancePtr, GpioIntrId,	(Xil_ExceptionHandler)IntrHandler, (void *)Gpio);



	/* Enable the interrupt for the GPIO device.为GPIO器件使能中断 */
	XScuGic_Enable(GicInstancePtr, GpioIntrId);

	/* Enable falling edge interrupts for all the pins in bank 0. */
//	XGpioPs_SetIntrType(Gpio, GPIO_BANK, 0x00, 0xFFFFFFFF, 0x00);

//	设置引脚终端类型：下降沿触发
	XGpioPs_SetIntrTypePin(Gpio, MIO50_KEY, XGPIOPS_IRQ_TYPE_EDGE_RISING);

	/* Set the handler for gpio interrupts. */
//	XGpioPs_SetCallbackHandler(Gpio, (void *)Gpio, IntrHandler);

	/* Enable the GPIO interrupts of Bank 0. */
//	XGpioPs_IntrEnable(Gpio, GPIO_BANK, (1 << Input_Pin));
//  打开引脚中断使能
	XGpioPs_IntrEnablePin(Gpio, MIO50_KEY);



//	return XST_SUCCESS;
}

void IntrHandler()
{
//	XGpioPs *Gpio = (XGpioPs *)CallBackRef;
//	u32 DataRead;
//
//	/* Push the switch button */
//	DataRead = XGpioPs_ReadPin(Gpio, Input_Pin);
//	if (DataRead != 0) {
//		XGpioPs_SetDirectionPin(Gpio, Output_Pin, 1);
//		XGpioPs_SetOutputEnablePin(Gpio, Output_Pin, 1);
//		XGpioPs_WritePin(Gpio, Output_Pin, DataRead);
//		AllButtonsPressed = TRUE;
//	}
	printf("interrupt detected!\r\n");
	XGpioPs_IntrDisablePin(&Gpio, MIO50_KEY);

}