ZYNQ EMIO MIO

1 概述

先来了解GPIO的BANK分布，在UG585文档GPIO一章中可以看到GPIO是有4个BANK，
注意与MIO的BANK区分。
BANK0 控制32个信号，BANK1控制22个信号，总共是MIO的54个引脚，也就是诸如
SPI,I2C,USB,SD 等 PS 端外设接口；
BANK2和BANK3共能控制64个PL端引脚，注意每一组都有三个信号，输入EMIOGPIOI，
输出EMIOGPIOO，输出使能EMIOGPIOTN，类似于三态门，共192个信号。可以连接到PL
端引脚，通过PS控制信号。
在这里插入图片描述

下图为GPIO的控制框图，实验中会用到输出部分的寄存器，数据寄存器DATA，数据掩
码寄存器MASK_DATA_LSW，MASK_DATA_MSW，方向控制寄存器DIRM，输出使能控制
器OEN。
在这里插入图片描述

2 MIO 按键中断

前面介绍了MIO作为输出控制LED灯，这里讲一下利用MIO作为按键输入控制LED灯。

通过UG585文档看下GPIO的结构图，中断的寄存器：
INT_MASK：中断掩码
INT_DIS: 中断关闭
INT_EN: 中断使能
INT_TYPE: 中断类型，设置电平敏感还是边沿敏感
INT_POLARITY: 中断极性，设置低电平或下降沿还是高电平或上升沿
INT_ANY: 边沿触发方式，需要INT_TYPE设置为边沿敏感才能使用
设置中断产生方式时需要INT_TYPE、INT_POLARITY、INT_ANY配合使用。具体寄存器含义请参
考UG585 Register Details 部分。

在这里插入图片描述

/******************************************************************************
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.  All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/

/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "sleep.h"
#include "xgpiops.h"

#define GPIO_DEVICE_ID		XPAR_XGPIOPS_0_DEVICE_ID

/*
 * The following are declared globally so they are zeroed and can be
 * easily accessible from a debugger.
 */
XGpioPs Gpio;	/* The driver instance for GPIO Device. */


int main()
{
    init_platform();
    int Status;
    XGpioPs_Config *ConfigPtr;

	/* Initialize the GPIO driver. */
	ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);

	Status = XGpioPs_CfgInitialize(&Gpio, ConfigPtr,
			ConfigPtr->BaseAddr);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
		 * Set the direction for the pin to be output and
		 * Enable the Output enable for the LED Pin.
		 */
		XGpioPs_SetDirectionPin(&Gpio, 54, 1);
		XGpioPs_SetDirectionPin(&Gpio, 55, 1);
		XGpioPs_SetDirectionPin(&Gpio, 56, 1);
		XGpioPs_SetDirectionPin(&Gpio, 57, 1);

		XGpioPs_SetDirectionPin(&Gpio, 58, 1);
		XGpioPs_SetDirectionPin(&Gpio, 59, 1);
		XGpioPs_SetDirectionPin(&Gpio, 60, 1);
		XGpioPs_SetDirectionPin(&Gpio, 61, 1);

		XGpioPs_SetDirectionPin(&Gpio, 62, 1);
		XGpioPs_SetDirectionPin(&Gpio, 63, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 54, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 55, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 56, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 57, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 58, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 59, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 60, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 61, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 62, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 63, 1);

    while(1){
		/* Set the GPIO output to be low. */
		XGpioPs_WritePin(&Gpio, 54, 0x0);
		XGpioPs_WritePin(&Gpio, 55, 0x0);
		XGpioPs_WritePin(&Gpio, 56, 0x0);
		XGpioPs_WritePin(&Gpio, 57, 0x0);

		XGpioPs_WritePin(&Gpio, 58, 0x0);
		XGpioPs_WritePin(&Gpio, 59, 0x0);
		XGpioPs_WritePin(&Gpio, 60, 0x0);
		XGpioPs_WritePin(&Gpio, 61, 0x0);

		XGpioPs_WritePin(&Gpio, 62, 0x0);
		XGpioPs_WritePin(&Gpio, 63, 0x0);
        sleep(1);
        print("Hello World\n\r");
	    /* Set the GPIO output to be high. */
	    XGpioPs_WritePin(&Gpio, 54, 0x1);
	    XGpioPs_WritePin(&Gpio, 55, 0x1);
	    XGpioPs_WritePin(&Gpio, 56, 0x1);
	    XGpioPs_WritePin(&Gpio, 57, 0x1);

	    XGpioPs_WritePin(&Gpio, 58, 0x1);
	    XGpioPs_WritePin(&Gpio, 59, 0x1);
	    XGpioPs_WritePin(&Gpio, 60, 0x1);
	    XGpioPs_WritePin(&Gpio, 61, 0x1);

	    XGpioPs_WritePin(&Gpio, 62, 0x1);
	    XGpioPs_WritePin(&Gpio, 63, 0x1);
        sleep(1);
    }
    cleanup_platform();
    return 0;
}

带按键中断的代码

/******************************************************************************
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.  All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/

/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include <stdio.h>
#include "platform.h"
#include "xscugic.h"
#include "xil_printf.h"
#include "sleep.h"
#include "xgpiops.h"

#define GPIO_DEVICE_ID		XPAR_XGPIOPS_0_DEVICE_ID
#define INTC_DEVICE_ID	    XPAR_SCUGIC_SINGLE_DEVICE_ID
#define KEY_INTR_ID         XPAR_XGPIOPS_0_INTR

#define EMIO_LD0  58
#define EMIO_LD1  59
#define EMIO_LD2  60
#define EMIO_LD3  61

/*
 * The following are declared globally so they are zeroed and can be
 * easily accessible from a debugger.
 */
XGpioPs Gpio;	/* The driver instance for GPIO Device. */
int key_flag ;
XScuGic INTCInst;

int IntrInitFuntion(XScuGic *InstancePtr, u16 DeviceId, XGpioPs *GpioInstancePtr);
void GpioHandler(void *CallbackRef);

int main()
{
    init_platform();
    int Status;
    XGpioPs_Config *ConfigPtr;

	int key_val  = 0 ;

	key_flag = 0 ;

	/* Initialize the GPIO driver. */
	ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);

	Status = XGpioPs_CfgInitialize(&Gpio, ConfigPtr,
			ConfigPtr->BaseAddr);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
		 * Set the direction for the pin to be output and
		 * Enable the Output enable for the LED Pin.
		 */
		XGpioPs_SetDirectionPin(&Gpio, 54, 1);
		XGpioPs_SetDirectionPin(&Gpio, 55, 1);
		XGpioPs_SetDirectionPin(&Gpio, 56, 1);
		XGpioPs_SetDirectionPin(&Gpio, 57, 1);

		XGpioPs_SetDirectionPin(&Gpio, 58, 1);
		XGpioPs_SetDirectionPin(&Gpio, 59, 1);
		XGpioPs_SetDirectionPin(&Gpio, 60, 1);
		XGpioPs_SetDirectionPin(&Gpio, 61, 1);

		XGpioPs_SetDirectionPin(&Gpio, 62, 1);
		XGpioPs_SetDirectionPin(&Gpio, 63, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 54, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 55, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 56, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 57, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 58, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 59, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 60, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 61, 1);

		XGpioPs_SetOutputEnablePin(&Gpio, 62, 1);
		XGpioPs_SetOutputEnablePin(&Gpio, 63, 1);


		//KEY
		/*
		 * Set the direction for the pin to be input.
		 * Set interrupt type as rising edge and enable gpio interrupt
		 */
		XGpioPs_SetDirectionPin(&Gpio, 64, 0);
		XGpioPs_SetIntrTypePin(&Gpio, 64, XGPIOPS_IRQ_TYPE_EDGE_RISING) ;
		XGpioPs_IntrEnablePin(&Gpio, 64) ;

		XGpioPs_SetDirectionPin(&Gpio, 65, 0);
		XGpioPs_SetDirectionPin(&Gpio, 66, 0);
		XGpioPs_SetDirectionPin(&Gpio, 67, 0);


		//SW
		XGpioPs_SetDirectionPin(&Gpio, 68, 0);
		XGpioPs_SetDirectionPin(&Gpio, 69, 0);

		/*
			 * sets up the interrupt system
			 */
	  Status = IntrInitFuntion(&INTCInst, 64, &Gpio) ;
			if (Status != XST_SUCCESS)
				return XST_FAILURE ;





    while(1){
		/* Set the GPIO output to be low. */
		XGpioPs_WritePin(&Gpio, 54, 0x0);
		XGpioPs_WritePin(&Gpio, 55, 0x0);
		XGpioPs_WritePin(&Gpio, 56, 0x0);
		XGpioPs_WritePin(&Gpio, 57, 0x0);

		XGpioPs_WritePin(&Gpio, 58, 0x0);
		XGpioPs_WritePin(&Gpio, 59, 0x0);

		XGpioPs_WritePin(&Gpio, 60, XGpioPs_ReadPin(&Gpio,68));
		XGpioPs_WritePin(&Gpio, 61, XGpioPs_ReadPin(&Gpio,69));

		//XGpioPs_WritePin(&Gpio, 62, 0x0);
		XGpioPs_WritePin(&Gpio, 63, 0x0);

		if (key_flag)
		{
			XGpioPs_WritePin(&Gpio, 62, key_val) ;
			key_val = ~key_val ;
			key_flag = 0 ;
		}
        sleep(1);
        print("Hello World\n\r");
	    /* Set the GPIO output to be high. */
	    XGpioPs_WritePin(&Gpio, 54, 0x1);
	    XGpioPs_WritePin(&Gpio, 55, 0x1);
	    XGpioPs_WritePin(&Gpio, 56, 0x1);
	    XGpioPs_WritePin(&Gpio, 57, 0x1);

	    XGpioPs_WritePin(&Gpio, 58, 0x1);
	    XGpioPs_WritePin(&Gpio, 59, 0x1);
	    //XGpioPs_WritePin(&Gpio, 60, 0x1);
	    //XGpioPs_WritePin(&Gpio, 61, 0x1);

	    //XGpioPs_WritePin(&Gpio, 62, 0x1);
	    XGpioPs_WritePin(&Gpio, 63, 0x1);
        sleep(1);
    }
    cleanup_platform();
    return 0;
}


int IntrInitFuntion(XScuGic *InstancePtr, u16 DeviceId, XGpioPs *GpioInstancePtr)
{
	XScuGic_Config *IntcConfig;
	int Status ;
	/*
	 * Initialize the interrupt controller driver so that it is ready to
	 * use.
	 */
	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
	 */
	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.
	 */
	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.
	 */
	XScuGic_Enable(InstancePtr, KEY_INTR_ID) ;

	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 Int_val ;

	Int_val = XGpioPs_IntrGetStatusPin(GpioInstancePtr, 64) ;
	/*
	 * Clear interrupt.
	 */
	XGpioPs_IntrClearPin(GpioInstancePtr, 64) ;
	if (Int_val)
		key_flag = 1 ;
}