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77.PS接收来自PL的按键中断

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09/04
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本篇文章主要介绍外设（PL）产生的中断请求，在PS端进行处理。 
在PL端通过按键产生中断，PS接受到之后点亮相应的LED.

本文所使用的开发板是zedboard
PC 开发环境版本：Vivado 2015.4 Xilinx SDK 2015.4

搭建硬件工程

建好工程后，添加ZYNQ IP

双击 ZYNQ,打开Re-customize IP对话框，使能IRQ_P2P

使能UART1

点击Run Connection Automation,按照如图所示配置，点击OK

添加一个GPIO IP,按照如图所示配置，使能中断。点击Run Connection Automation

再添加一个GPIO IP，按照如图所示配置,点击OK

把axi_gpio_0的ip2intc_irpt和ZYNQ PS的 IRQ_F2P[0:0]连在一起

搭建好的硬件系统连接，如图所示

生成顶层文件，点击Generate BitStream

软件工程

新建一个Hello World工程，把以下代码添加进去

#include <stdio.h>
#include "platform.h"
#include "xparameters.h"
#include "xscugic.h"
#include "xil_exception.h"
#include "xgpio.h" //parameter definitions
#define INTC_DEVICE_ID XPAR_PS7_SCUGIC_0_DEVICE_ID //DEVICE_ID用来初始化函数，索引数组元素
#define LED_DEVICE_ID XPAR_AXI_GPIO_1_DEVICE_ID
#define BTNS_DEVICE_ID XPAR_AXI_GPIO_0_DEVICE_ID
#define INTC_GPIO_INTERRUPT_ID XPAR_FABRIC_AXI_GPIO_0_IP2INTC_IRPT_INTR
#define BTN_INT XGPIO_IR_CH1_MASK
#define DELAY 100000000 XGpio LED;
XGpio BTNInst;
XScuGic INTCInst;
static int btn_value; //Function protype
static void BTN_Intr_Handler(void *baseaddr_p);
static int InterruptSystemSetup(XScuGic *XScuGicInstancePtr);
static int IntcInitFunction(u16 DeviceId,XGpio *GpioInstancePtr); void BTN_Intr_Handler(void *InstancePtr)
{
unsigned char led_val=;
//Ignore additional button presses
if((XGpio_InterruptGetStatus(&BTNInst) & BTN_INT) != BTN_INT)
{
return;
//Disable GPIO interrupts
XGpio_InterruptDisable(&BTNInst,BTN_INT);
}
btn_value = XGpio_DiscreteRead(&BTNInst,);
switch(btn_value)
{
case : led_val = 0x01;break; //led[7:0]=0x01
case : led_val = 0x02;break;
case : led_val = 0x03;break; //亮1和2
case : led_val = 0x04;break;
case : led_val = 0x05;break; //亮0和2
default:break;
} XGpio_DiscreteWrite(&LED,,led_val);
//Acknowledge GPIO interrupts
(void)XGpio_InterruptClear(&BTNInst,BTN_INT);
//Enable GPIO interrupts
XGpio_InterruptEnable(&BTNInst,BTN_INT);
} int main(void)
{
int status; //按键初始化
status = XGpio_Initialize(&BTNInst,BTNS_DEVICE_ID);
if(status != XST_SUCCESS) return XST_FAILURE; //初始化LED
status = XGpio_Initialize(&LED,LED_DEVICE_ID);
if(status != XST_SUCCESS) return XST_FAILURE; //设置按键IO的方向为输入
XGpio_SetDataDirection(&BTNInst,,0xff);
//设置LED IO 的方向为输出
XGpio_SetDataDirection(&LED,,0X00); //初始化中断控制器
status = IntcInitFunction(INTC_DEVICE_ID,&BTNInst);
if(status != XST_SUCCESS) return XST_FAILURE; while(){} return ;
} int IntcInitFunction(u16 DeviceId,XGpio *GpioInstancePtr)
{
XScuGic_Config *IntcConfig;
int status; //Interrupt controller initialization
IntcConfig = XScuGic_LookupConfig(DeviceId);
status = XScuGic_CfgInitialize(&INTCInst,IntcConfig,IntcConfig->CpuBaseAddress);
if(status != XST_SUCCESS) return XST_FAILURE; //Call interrupt setup function
status = InterruptSystemSetup(&INTCInst);
if(status != XST_SUCCESS) return XST_FAILURE; //Register GPIO interrupt handler
status = XScuGic_Connect(&INTCInst,INTC_GPIO_INTERRUPT_ID,(Xil_ExceptionHandler)BTN_Intr_Handler,(void *)GpioInstancePtr);
if(status != XST_SUCCESS) return XST_FAILURE; //Enable GPIO interrupts
XGpio_InterruptEnable(GpioInstancePtr,);
XGpio_InterruptGlobalEnable(GpioInstancePtr); //Enable GPIO interrupts in the controller
XScuGic_Enable(&INTCInst,INTC_GPIO_INTERRUPT_ID); return XST_SUCCESS;
} int InterruptSystemSetup(XScuGic *XScuGicInstancePtr)
{
//Register GIC interrupt handler
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,(Xil_ExceptionHandler)XScuGic_InterruptHandler,XScuGicInstancePtr);
Xil_ExceptionEnable(); return XST_SUCCESS;
}

下载好之后，按键按下可以看到相应的LED被点亮