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Miz702(兼容zedboard)
PC 开发环境版本:Vivado 2015.2 Xilinx SDK 2015.2
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 "xparameters.h"
#include "xscugic.h"
#include "xil_exception.h"
#include "xgpio.h"
// Parameter definitions
#define INTC_DEVICE_ID XPAR_PS7_SCUGIC_0_DEVICE_ID
#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 // This is the interrupt mask for channel one
#define DELAY 100000000
XGpio LED;
XGpio BTNInst;
XScuGic INTCInst;
static int btn_value;
//----------------------------------------------------
// PROTOTYPE FUNCTIONS
//----------------------------------------------------
static void BTN_Intr_Handler(void *baseaddr_p);
static int InterruptSystemSetup(XScuGic *XScuGicInstancePtr);
static int IntcInitFunction(u16 DeviceId, XGpio *GpioInstancePtr);
//----------------------------------------------------
// INTERRUPT SERVICE ROUTINE(ISR)
//also know as : INTERRUPT HANDLER FUNCTION
// - called by the buttons interrupt, performs push buttons read
//----------------------------------------------------
void BTN_Intr_Handler(void *InstancePtr)
{
unsigned char led_val = 0;
// 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, 1);
switch (btn_value){
case 1: led_val = 0x01; break;
case 2: led_val = 0x02; break;
case 4: led_val = 0x03; break;
case 8: led_val = 0x04; break;
case 16:led_val = 0x05; break;
default:break; }
XGpio_DiscreteWrite(&LED,1,led_val);
// Acknowledge GPIO interrupts
(void)XGpio_InterruptClear(&BTNInst, BTN_INT);
// Enable GPIO interrupts
XGpio_InterruptEnable(&BTNInst, BTN_INT);
}
//----------------------------------------------------
// MAIN FUNCTION
//----------------------------------------------------
int main (void)
{
int status;
// 初始化按键
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, 1, 0xFF);
//设置LED IO的方向为输出
XGpio_SetDataDirection(&LED, 1, 0x00);
// 初始化中断控制器
status = IntcInitFunction(INTC_DEVICE_ID, &BTNInst);
if(status != XST_SUCCESS) return XST_FAILURE;
while(1){
}
return (0);
}
//----------------------------------------------------
// INTERRUPT SETUP FUNCTIONS
//----------------------------------------------------
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, 1);
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;
}