中断初始化设置过程#
- 查找中断控制器配置信息并初始化中断控制器驱动（XScuGic_LookupConfig、XScuGic_CfgInitialize）
- 设置中断类型（XScuGic_SetPriorityTriggerType）
- 为中断设置中断处理函数（XScuGic_Connect）
- 使能中断 (XScuGic_Enable)
- 设置并使能中断异常（Xil_ExceptionInit、Xil_ExceptionRegisterHandler、Xil_ExceptionEnable）
- 打开 GPIO 中断（XGpioPs_IntrEnablePin）
代码示例#
该代码包含部分 AXI GPIO 初始化的代码，其余都为 PS 端 GPIO 的初始化和中断初始化配置
/******************************************************************************
* Copyright (C) 2002 - 2021 Xilinx, Inc. All rights reserved.
* SPDX-License-Identifier: MIT
******************************************************************************/
/*****************************************************************************/
/**
* @file xgpio_example.c
*
* This file contains a design example using the AXI GPIO driver (XGpio) and
* hardware device. It only uses channel 1 of a GPIO device and assumes that
* the bit 0 of the GPIO is connected to the LED on the HW board.
*
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a rmm 03/13/02 First release
* 1.00a rpm 08/04/03 Removed second example and invalid macro calls
* 2.00a jhl 12/15/03 Added support for dual channels
* 2.00a sv 04/20/05 Minor changes to comply to Doxygen and coding guidelines
* 3.00a ktn 11/20/09 Minor changes as per coding guidelines.
* 4.1 lks 11/18/15 Updated to use canonical xparameters and
* clean up of the comments and code for CR 900381
* 4.3 sk 09/29/16 Modified the example to make it work when LED_bits are
* configured as an output. CR# 958644
* ms 01/23/17 Added xil_printf statement in main function to
* ensure that "Successfully ran" and "Failed" strings
* are available in all examples. This is a fix for
* CR-965028.
* 4.5 sne 06/12/19 Fixed IAR compiler warning.
*
* </pre>
******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"
#include "xgpio.h"
#include "xil_printf.h"
#include "sleep.h"
#include "xscugic.h"
#include "xil_exception.h"
#include <xgpiops.h>
/************************** Constant Definitions *****************************/
#define MODE_SINGLE_TONE 0x00
#define MODE_PRINTER 0x01
/*
* The following constants map to the XPAR parameters created in the
* xparameters.h file. They are defined here such that a user can easily
* change all the needed parameters in one place.
*/
//PS端GPIO器件ID
#define GPIO_EXAMPLE_DEVICE_ID XPAR_GPIO_0_DEVICE_ID
/*
* The following constant is used to wait after an LED is turned on to make
* sure that it is visible to the human eye. This constant might need to be
* tuned for faster or slower processor speeds.
*/
#define LED_DELAY 10000000
/*
* The following constant is used to determine which channel of the GPIO is
* used for the LED if there are 2 channels supported.
*/
#define MODE_CHANGE_CHANNEL 1
/*GPIO define */
//PS端GPIO器件ID
#define MIO_ID XPAR_PS7_GPIO_0_DEVICE_ID
//通用中断控制器ID
#define INTC_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID
//PS端GPIO中断ID
#define KEY_INTR_ID XPAR_XGPIOPS_0_INTR
#define PS_KEY_MIO 50 //key连接到MIO50
#define PS_LED_MIO_1 0
#define PS_LED_MIO_2 13
#define GPIO_INPUT 1
#define GPIO_OUTPUT 0
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
int IntrInitFunction(XScuGic *InstancePtr, u16 DeviceId, XGpioPs *GpioInstancePtr);
void GpioHandler(void *CallBackRef);
/************************** Variable Definitions *****************************/
/*
* The following are declared globally so they are zeroed and so they are
* easily accessible from a debugger
*/
XGpio Gpio; /* PL端AXI GPIO外设驱动实例 */
XGpioPs GpioPs; /* PS端GPIO外设驱动实例 */
XScuGic INTCInst; /* 通用中断控制器驱动实例 */
int key_flag; // ps key 0 flag
/*****************************************************************************/
/**
*
* The purpose of this function is to illustrate how to use the GPIO
* driver to turn on and off an LED.
*
*
* @return XST_FAILURE to indicate that the GPIO Initialization had
* failed.
*
* @note This function will not return if the test is running.
*
******************************************************************************/
int main(void)
{
XGpioPs_Config *GpioConfig; /*PS端GPIO配置信息*/
int Status;
int mode_flag = 0;
key_flag = 0;
/* Initialize the GPIOps driver*/
/*根据器件ID查找配置信息*/
GpioConfig = XGpioPs_LookupConfig(MIO_ID);
/*初始化GPIO Driver*/
Status = XGpioPs_CfgInitialize(&GpioPs, GpioConfig, GpioConfig->BaseAddr);
if (Status != XST_SUCCESS)
{
xil_printf("GpioPs Initialization Failed\r\n");
return XST_FAILURE;
}
else
{
xil_printf("GpioPs Initialization Success\r\n");
}
/* Initialize the GPIO driver */
/*初始化PL端AXI GPIO驱动*/
Status = XGpio_Initialize(&Gpio, GPIO_EXAMPLE_DEVICE_ID);
if (Status != XST_SUCCESS)
{
xil_printf("Gpio Initialization Failed\r\n");
return XST_FAILURE;
}
else
{
xil_printf("Gpio Initialization Success\r\n");
}
/*GPIO_PS Intr init*/
/*设置KEY连接的MIO引脚的方向为输入*/
XGpioPs_SetDirectionPin(&GpioPs, PS_KEY_MIO, GPIO_INPUT);
/*使能按键中断*/
XGpioPs_SetIntrTypePin(&GpioPs, PS_KEY_MIO, XGPIOPS_IRQ_TYPE_EDGE_RISING);
XGpioPs_IntrEnablePin(&GpioPs, PS_KEY_MIO);
Status = IntrInitFunction(&INTCInst, MIO_ID, &GpioPs);
if (Status != XST_SUCCESS)
{
xil_printf("IntrInitFunction Failed\r\n");
return XST_FAILURE;
}
else
{
xil_printf("IntrInitFunction Success\r\n");
}
/* Set the direction for GPIO OUT */
XGpio_SetDataDirection(&Gpio, MODE_CHANGE_CHANNEL, GPIO_OUTPUT);
/*Set the direction for PS GPIO 1 for output & 0 for input*/
XGpioPs_SetDirectionPin(&GpioPs, PS_LED_MIO_1, 1);
XGpioPs_SetDirectionPin(&GpioPs, PS_LED_MIO_2, 1);
XGpioPs_SetOutputEnablePin(&GpioPs, PS_LED_MIO_1, 1);
XGpioPs_SetOutputEnablePin(&GpioPs, PS_LED_MIO_2, 1);
/* Loop forever blinking the LED */
while (1)
{
if (key_flag)
{
if (mode_flag == 0)
{
XGpio_DiscreteWrite(&Gpio, MODE_CHANGE_CHANNEL, MODE_SINGLE_TONE);
xil_printf("MODE_SINGLE_TONE, mode flag:%d\r\n", mode_flag);
XGpioPs_WritePin(&GpioPs, PS_LED_MIO_1, 0); // LED1 ON
XGpioPs_WritePin(&GpioPs, PS_LED_MIO_2, 1); // LED2 OFF
mode_flag++;
}
else if (mode_flag == 1)
{
XGpio_DiscreteWrite(&Gpio, MODE_CHANGE_CHANNEL, MODE_PRINTER);
xil_printf("Painter, mode flag:%d\r\n", mode_flag);
XGpioPs_WritePin(&GpioPs, PS_LED_MIO_1, 1); // LED1 OFF
XGpioPs_WritePin(&GpioPs, PS_LED_MIO_2, 0); // LED2 ON
mode_flag = 0;
}
key_flag = 0;
}
}
return 0;
}
int IntrInitFunction(XScuGic *InstancePtr, u16 DeviceId, XGpioPs *GpioInstancePtr)
{
XScuGic_Config *IntcConfig; /*中断控制器配置信息*/
int Status;
/*
* Initialize the interrupt controller driver so that it is ready to
* use.
*/
/*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);
Status = XScuGic_CfgInitialize(InstancePtr, IntcConfig, IntcConfig->CpuBaseAddress);
if (Status != XST_SUCCESS)
return XST_FAILURE;
/*
* set priority and trigger type
* 设置中断类型为上升沿中断
*/
XScuGic_SetPriorityTriggerType(InstancePtr, KEY_INTR_ID,
0xA0, 0x3);
/*
* Connect the device driver handler that will be called when an
* interrupt for the device occurs, the handler defined above performs
* the specific interrupt processing for the device.
*/
/*为中断设置中断处理函数*/
Status = XScuGic_Connect(InstancePtr, KEY_INTR_ID,
(Xil_ExceptionHandler)GpioHandler,
(void *)GpioInstancePtr);
if (Status != XST_SUCCESS)
return XST_FAILURE;
/*
* Enable the interrupt for the device.
* 使能来自GPIO的中断
*/
XScuGic_Enable(InstancePtr, KEY_INTR_ID);
/*设置并使能中断异常*/
Xil_ExceptionInit();
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)XScuGic_InterruptHandler,
InstancePtr);
Xil_ExceptionEnable();
return XST_SUCCESS;
}
void GpioHandler(void *CallBackRef)
{
XGpioPs *GpioInstancePtr = (XGpioPs *)CallBackRef;
int intr_val;
intr_val = XGpioPs_IntrGetStatusPin(GpioInstancePtr, PS_KEY_MIO);
/* Clear the interrupt */
XGpioPs_IntrClearPin(GpioInstancePtr, PS_KEY_MIO);
if (intr_val)
{
xil_printf("Button Pressed\r\n");
key_flag = 1;
}
}