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1.开发背景

       基于上一个篇章 GPIO 使用，引入中断的使用。

2.开发需求

        PS 和 PL 按键输入中断，并输出对应的日志打印

3.开发环境

        Zynq7020 + Vivado2017.4

4.实现步骤

4.1 设计配置

PL Key0 56 

PS key0 12

PS key1 11

4.2 代码编写

GPIO 配置

#ifndef MSP_GPIO_H
#define MSP_GPIO_H#include "xgpiops.h"/* PS GPIO 映射 */
#define BOARD_LED0      (7)
#define BOARD_KEY0      (12)
#define BOARD_KEY1      (11)
#define CORE_LED        (0)/* PL GPIO 映射 */
#define EMIO_LED0       (54)
#define EMIO_LED1       (55)
#define EMIO_KEY0       (56)int mspGpio_Init(void);
void mspGpio_SetOutput(unsigned char gpioId, unsigned char state);
unsigned char mspGpio_GetInput(unsigned char gpioId);XGpioPs* mspGpio_GetPsHandle(void);#endif

#include "mspGpio.h"/* gpio 设备，不知为何为 0 */
#define GPIO_DEVICE_ID      XPAR_XGPIOPS_0_DEVICE_ID    // 0static XGpioPs s_psGpio = {0};/* GPIO 初始化 */
int mspGpio_Init(void)
{/* 通过设备 ID 找到对应的配置指针 */XGpioPs_Config *ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);/* 通过配置指针初始化GPIO */int Status = XGpioPs_CfgInitialize(&s_psGpio, ConfigPtr,ConfigPtr->BaseAddr);if (Status != XST_SUCCESS){return -1;}/* 设置  GPIO 方向输出，这里为什么会共用一个 GPIO 结构体？参数一致？  */XGpioPs_SetDirectionPin(&s_psGpio, CORE_LED, 1);XGpioPs_SetDirectionPin(&s_psGpio, BOARD_LED0, 1);XGpioPs_SetDirectionPin(&s_psGpio, BOARD_KEY0, 0);XGpioPs_SetDirectionPin(&s_psGpio, BOARD_KEY1, 0);XGpioPs_SetDirectionPin(&s_psGpio, EMIO_LED0, 1);XGpioPs_SetDirectionPin(&s_psGpio, EMIO_LED1, 1);XGpioPs_SetDirectionPin(&s_psGpio, EMIO_KEY0, 0);/* 使能 GPIO */XGpioPs_SetOutputEnablePin(&s_psGpio, BOARD_LED0, 1);XGpioPs_SetOutputEnablePin(&s_psGpio, CORE_LED, 1);XGpioPs_SetOutputEnablePin(&s_psGpio, EMIO_LED0, 1);XGpioPs_SetOutputEnablePin(&s_psGpio, EMIO_LED1, 1);return 0;
}/* 设置输出 */
void mspGpio_SetOutput(unsigned char gpioId, unsigned char state)
{XGpioPs_WritePin(&s_psGpio, gpioId, state);
}/* 获取输入 */
unsigned char mspGpio_GetInput(unsigned char gpioId)
{return XGpioPs_ReadPin(&s_psGpio, gpioId);
}/* 获取 PS GPIO 句柄 */
XGpioPs* mspGpio_GetPsHandle(void)
{return &s_psGpio;
}

        中断配置

#include "mspExit.h"#include "xscugic.h"#include "mspCore.h"
#include "mspGpio.h"
#include "mspTimer.h"static XScuGic intc = {0};   //通用中断控制器驱动实例//以下常量映射到xparameters.h文件
#define GPIO_DEVICE_ID      XPAR_XGPIOPS_0_DEVICE_ID      //PS端GPIO器件ID
#define INTC_DEVICE_ID      XPAR_SCUGIC_SINGLE_DEVICE_ID  //通用中断控制器ID
#define GPIO_INTERRUPT_ID   XPAR_XGPIOPS_0_INTR           //PS端GPIO中断IDstatic void intr_handler(void *callback_ref);/* 初始化中断接口 */
int setup_interrupt_system(XScuGic *gic_ins_ptr, XGpioPs *gpio, u16 GpioIntrId)
{int status;XScuGic_Config *IntcConfig;     //中断控制器配置信息//查找中断控制器配置信息并初始化中断控制器驱动IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);if (NULL == IntcConfig){return XST_FAILURE;}status = XScuGic_CfgInitialize(gic_ins_ptr, IntcConfig,IntcConfig->CpuBaseAddress);if (status != XST_SUCCESS){return XST_FAILURE;}//设置并使能中断异常Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,(Xil_ExceptionHandler) XScuGic_InterruptHandler, gic_ins_ptr);Xil_ExceptionEnable();//为中断设置中断处理函数status = XScuGic_Connect(gic_ins_ptr, GpioIntrId,(Xil_ExceptionHandler) intr_handler, (void *) gpio);if (status != XST_SUCCESS){return status;}//使能来自于Gpio器件的中断XScuGic_Enable(gic_ins_ptr, GpioIntrId);//设置KEY按键的中断类型为下降沿中断XGpioPs_SetIntrTypePin(gpio, BOARD_KEY0, XGPIOPS_IRQ_TYPE_EDGE_FALLING);XGpioPs_SetIntrTypePin(gpio, BOARD_KEY1, XGPIOPS_IRQ_TYPE_EDGE_FALLING);XGpioPs_SetIntrTypePin(gpio, EMIO_KEY0, XGPIOPS_IRQ_TYPE_EDGE_FALLING);//使能按键KEY中断XGpioPs_IntrEnablePin(gpio, BOARD_KEY0);XGpioPs_IntrEnablePin(gpio, BOARD_KEY1);XGpioPs_IntrEnablePin(gpio, EMIO_KEY0);return XST_SUCCESS;
}/* 中断初始化 */
int mspExit_Init(void)
{setup_interrupt_system(&intc, mspGpio_GetPsHandle(), XPAR_XGPIOPS_0_INTR);return 0;
}/* 中断处理 */
void intr_handler(void *callback_ref)
{/* 强行延时 */
//    mspTimer_DelayMs(100);XGpioPs *gpio = (XGpioPs *) callback_ref;//读取KEY按键引脚的中断状态，判断是否发生中断if (XGpioPs_IntrGetStatusPin(gpio, BOARD_KEY1)){printf("key = %d\r\n", BOARD_KEY1);XGpioPs_IntrClearPin(gpio, BOARD_KEY1);      //清除按键KEY中断}else if (XGpioPs_IntrGetStatusPin(gpio, BOARD_KEY0)){printf("key = %d\r\n", BOARD_KEY0);XGpioPs_IntrClearPin(gpio, BOARD_KEY0);      //清除按键KEY中断}else if (XGpioPs_IntrGetStatusPin(gpio, EMIO_KEY0)){printf("key = %d\r\n", EMIO_KEY0);XGpioPs_IntrClearPin(gpio, EMIO_KEY0);      //清除按键KEY中断}
}

4.3 运行结果