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ZYNQ 用PL按键通过中断控制PS端LED亮灭

热度:31   发布时间:2024-01-06 05:21:01.0

关键词:AXI-GPIO;中断;PL按键;PS端LED

实现功能:PL端五个按键,可以触发中断,改变LED灯的亮灭状态

开发板:zedboard

  • vivado硬件连接如图:

AXI Interconnect:实际是一个开关,管理和只会axi接口之间的通信(包括一对一、一对多、多对一、多对多)

processing_system7_0:为整个处理器系统提供复位信号

axi_gpio:软核GPIO,即由FPGA搭建,而不是硬件出厂配置好的

  • 配置:

        axi_gpio:位宽1;中断使能打开;  自动连线之后位宽变为5

                        

  •  打开PL到PS中断端口,并把axi_gpio中断端口连接到z7

  •  点击左侧Open Elaborated Design分配管脚,zedboard自动分配完成。pin号如图所示,开发板右下角5个键位

  •  file-export-export hardware  包含bit文件

  • file-launch sdk

  • 新建应用工程hello world

  • 中断号  61
 #define AXI_GPIO_INTERRUPT_ID	  XPAR_FABRIC_AXI_GPIO_0_IP2INTC_IRPT_INTR
  • 检测到按键按下之后要先读数据  GPIOX_DATA判断按键状态,调用XGpio_DiscreteRead函数进行判断。否则灯的状态不变
if((XGpio_DiscreteRead(&AXI_Gpio, GPIO_CHANNEL1) )!= 0)
  • main.c完整代码:
#include <stdio.h>
#include "xparameters.h"
#include "xgpiops.h"
#include "xstatus.h"
#include "xplatform_info.h"
#include <xil_printf.h>
#include "sleep.h"
#include "xscugic.h"
#include "xgpio.h"#define AXI_GPIO_DEVICE_ID		XPAR_GPIO_0_DEVICE_ID    //axi_gpio  ID#define GPIO_DEVICE_ID		XPAR_XGPIOPS_0_DEVICE_ID      //PS gpio   ID
#define INTC_DEVICE_ID		XPAR_SCUGIC_SINGLE_DEVICE_ID  //中断控制器ID
#define MIO7_LED            7    //ps端LED
#define	MIO50_KEY           51    //按键//AXI_GPIO中段号:61#define AXI_GPIO_INTERRUPT_ID	  XPAR_FABRIC_AXI_GPIO_0_IP2INTC_IRPT_INTR
#define GPIO_CHANNEL1		1     //axi_gpio通道1
XGpioPs_Config *ConfigPtr;
XScuGic_Config *IntcConfig; /* Instance of the interrupt controller */
XGpioPs Gpio;	/* The driver instance for GPIO Device. */
XGpio AXI_Gpio; /* The Instance of the GPIO Driver */static XScuGic Intc; /* The Instance of the Interrupt Controller Driver */void SetupInterruptSystem(XScuGic *GicInstancePtr, XGpio *AXI_Gpio,u16 AXI_GpioIntrId);
void IntrHandler();
u32 KEY_PRESS = 0;int main()
{u32 led_value = 0;printf("***AXI GPIO INTERRUPT TEST***\r\n");//根据器件id,查找PS端器件配置信息。并初始化ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);XGpioPs_CfgInitialize(&Gpio, ConfigPtr, ConfigPtr->BaseAddr);//	AXI_GPIO初始化XGpio_Initialize(&AXI_Gpio, AXI_GPIO_DEVICE_ID);//gpio方向设置为输出(0:输入、1:输出),并打开输出使能XGpioPs_SetDirectionPin(&Gpio, MIO7_LED, 1);XGpioPs_SetOutputEnablePin(&Gpio, MIO7_LED, 1);XGpioPs_WritePin(&Gpio, MIO7_LED, led_value);   //初始化led灯,处于熄灭状态,否则第一次按键led状态不变//	AXI_GPIO配置
//	XGpio_SetDataDirection(&AXI_Gpio, GPIO_CHANNEL1, 0x00000001);   //	把最低位设置为输入XGpio_SetDataDirection(&AXI_Gpio, GPIO_CHANNEL1, 0x0000001f);   //  把后5位设置为输入SetupInterruptSystem(&Intc, &AXI_Gpio, AXI_GPIO_INTERRUPT_ID);while(1){if(KEY_PRESS){
//			判断当前按键状态,如果是按键按下,就改变LED状态if((XGpio_DiscreteRead(&AXI_Gpio, GPIO_CHANNEL1)) !=0)led_value = ~led_value;KEY_PRESS = 0;
//			清除中断状态XGpio_InterruptClear(&AXI_Gpio, 0x0000001f);
//			写数据到输出引脚XGpioPs_WritePin(&Gpio, MIO7_LED, led_value);
//			延时消抖usleep(200000);
//			重新打开使能引脚中断XGpio_InterruptEnable(&AXI_Gpio, 0x0000001f);}}return 0;
}void SetupInterruptSystem(XScuGic *GicInstancePtr, XGpio *AXI_Gpio,u16 AXI_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);
//	使能处理器中断.Enable interrupts in the Processor.Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ);//	关联   中断处理函数,对中断进行处理XScuGic_Connect(GicInstancePtr, AXI_GpioIntrId,	(Xil_ExceptionHandler)IntrHandler, (void *)AXI_Gpio);/* Enable the interrupt for the GPIO device.为GPIO器件使能中断 */XScuGic_Enable(GicInstancePtr, AXI_GpioIntrId);//	设置优先级和触发类型,0x1中断类型:高有效电平敏感型XScuGic_SetPriorityTriggerType(GicInstancePtr, AXI_GpioIntrId, 0xA0, 0x1);//	打开AXI_GPIO  IP的中断使能XGpio_InterruptGlobalEnable(AXI_Gpio);                //   打开全局中断XGpio_InterruptEnable(AXI_Gpio, 0x0000001f);         //    打开通道中的信号对应中断使能//	return XST_SUCCESS;
}void IntrHandler()
{printf("interrupt detected!\r\n");KEY_PRESS = 1;XGpio_InterruptDisable(&AXI_Gpio, 0x0000001f);}
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