基于PS端的 定时器中断

ZYNQ中每个ARM core都有自己的私有定时器，私有定时器的工作频率为CPU的一半，如ZYNQ的工作频率为666MHZ,则定时器的频率为333MHz，后面需要注意这个时钟。

定时器中断1S LED闪烁实验

#include "xparameters.h"
#include "xgpiops.h"
#include "xstatus.h"
#include "xplatform_info.h"
#include "xscutimer.h"
#include "Xscugic.h"

#define LED        54

#define GPIO_DEVICE_ID      XPAR_XGPIOPS_0_DEVICE_ID
XGpioPs Gpio;


void Gpio_Init(void){
    XGpioPs_Config *ConfigPtr;

    ConfigPtr = XGpioPs_LookupConfig(GPIO_DEVICE_ID);
    XGpioPs_CfgInitialize(&Gpio, ConfigPtr,ConfigPtr->BaseAddr);

    XGpioPs_SetDirectionPin(&Gpio, LED, 1);
    XGpioPs_SetOutputEnablePin(&Gpio, LED, 1);
    XGpioPs_WritePin(&Gpio, LED, 0);
}


#define TIMER_DEVICE_ID XPAR_XSCUTIMER_0_DEVICE_ID
#define INTC_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID
#define TIMER_IRPT_INTR XPAR_SCUTIMER_INTR
#define TIMER_LOAD_VALUE 0x514c7 //666*1000*1/2 666mhz
static XScuGic Intc; //GIC
static XScuTimer Timer;//timer

static void SetupInterruptSystem(XScuGic *GicInstancePtr,
XScuTimer *TimerInstancePtr, u16 TimerIntrId);
static void TimerIntrHandler(void *CallBackRef);

void SetupInterruptSystem(XScuGic *GicInstancePtr,XScuTimer *TimerInstancePtr, u16 TimerIntrId){
    XScuGic_Config *IntcConfig; //GIC config
    Xil_ExceptionInit();
    //initialise the GIC
    IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);
    XScuGic_CfgInitialize(GicInstancePtr, IntcConfig,IntcConfig->CpuBaseAddress);
    //connect to the hardware
    Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
        (Xil_ExceptionHandler)XScuGic_InterruptHandler,
        GicInstancePtr);
    //set up the timer interrupt
    XScuGic_Connect(GicInstancePtr, TimerIntrId,
        (Xil_ExceptionHandler)TimerIntrHandler,
        (void *)TimerInstancePtr);
    //enable the interrupt for the Timer at GIC
    XScuGic_Enable(GicInstancePtr, TimerIntrId);
    //enable interrupt on the timer
    XScuTimer_EnableInterrupt(TimerInstancePtr);
    // Enable interrupts in the Processor.
    Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ);
}

volatile int ms_count;
unsigned char led_state=0;

static void TimerIntrHandler(void *CallBackRef){
    static int ms_count = 0; //计数
    XScuTimer *TimerInstancePtr = (XScuTimer *) CallBackRef;
    XScuTimer_ClearInterruptStatus(TimerInstancePtr);

    ms_count++;
    if(ms_count>=1000){
        ms_count=0;
        if(led_state==0)led_state=1;
        else led_state=0;
        XGpioPs_WritePin(&Gpio, LED, led_state);
    }
}


void Timer_Init(){
    XScuTimer_Config *TMRConfigPtr;
    TMRConfigPtr = XScuTimer_LookupConfig(TIMER_DEVICE_ID);
    XScuTimer_CfgInitialize(&Timer, TMRConfigPtr,TMRConfigPtr->BaseAddr);
    XScuTimer_SelfTest(&Timer);
    XScuTimer_LoadTimer(&Timer, TIMER_LOAD_VALUE);
    //自动装载
    XScuTimer_EnableAutoReload(&Timer);
    //启动定时器
    XScuTimer_Start(&Timer);
    //set up the interrupts
    SetupInterruptSystem(&Intc,&Timer,TIMER_IRPT_INTR);
}
int main(void)
{
    Gpio_Init();
    Timer_Init();

    while(1);

    return 0;
}

Smart ZYNQ板 工程十八  基于PS端的 定时器中断 – 你好，FPGA (hellofpga.com)