Timer_ISR_Init()

altera公司nios II 处理器的HAL系统里　 初始化中断

看下面的例子：

#include <stdio.h>

#include <sys/unistd.h>

#include <io.h>

#include <string.h>

#include "system.h"

#include "altera_avalon_pio_regs.h"

#include "altera_avalon_timer_regs.h"

#include "alt_types.h"

#include "sys/alt_irq.h"

#define　　 TRUE　　　 1

#define　　 FALSE　　 0

/***********************************************/

static void Timer_ISR_Init(void);　　　 //初始化中断

/***********************************************/

int main(void)

{

printf("\ Exp4 - Keyboard & 7Seg LED!\");

//设置Timer中断

Timer_ISR_Init();

while(1)

{

usleep(10000);

}

return 0;

}

/***********************************************/

//Timer

alt_u8 DispSegTab[]={ 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};　 //0~F

alt_u8 PrintDispTab[]={ '0', '1', '2', '3', '4', '5', '6', '7',

'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};　 //0~F

alt_u8 KeyTab[]={　　 0x4e,0x67,0x47,0x27,

0x6b,0x4b,0x2b,0x6d,

0x4d,0x2d,0x07,0x0b,

0x0d,0x0e,0x6e,0x2e };

alt_u8 KB_Scan_Tab[8] = {0x0e, 0xff, 0x0d, 0xff, 0x0b, 0xff, 0x07, 0xff};

alt_u8 DispBuff[8] = {16,16,16,16,16,16,16,16};

alt_u8 KeyValue;

alt_u8 DisplayNum, PressedKeyNum = 0, KeyPressedFlag;

static void Timer_Irq_Handler(void *context, alt_u32 id)

{

alt_u8 i,j;

DisplayNum = (DisplayNum + 1) % 8;

//输出显示扫描信号

IOWR_ALTERA_AVALON_PIO_DATA(SEG_SEL_BASE, DisplayNum);　

IOWR_ALTERA_AVALON_PIO_DATA(SEG_A_DP_BASE, DispSegTab[DispBuff[DisplayNum]]);　

//判断有无按键按下

IOWR_ALTERA_AVALON_PIO_DATA(KB_COL_BASE, KB_Scan_Tab[DisplayNum]);　

KeyValue = IORD_ALTERA_AVALON_PIO_DATA(KB_ROW_BASE) & 0x0f;

if(KeyValue != 0x0f && !KeyPressedFlag)

{

KeyPressedFlag = TRUE;

PressedKeyNum = DisplayNum;

//转换键值

KeyValue |= DisplayNum << 4;

for(i=0; i<16; i++)

{

if(KeyValue == KeyTab[i])

break;

}

if(i < 16)

{

for(j=0; j<7; j++)

DispBuff[j] = DispBuff[j+1];

DispBuff[j] = i;

printf("You pressed '%c' key!\", PrintDispTab[i]);

}

}

else if(PressedKeyNum == DisplayNum && KeyValue == 0x0f && KeyPressedFlag)

KeyPressedFlag = FALSE;

//清除Timer中断标志寄存器

IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);

}

/************************************************/

static void Timer_ISR_Init(void)　　　 //初始化中断

{

//清除Timer中断标志寄存器

IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);

//注册Timer中断

alt_irq_register(TIMER_IRQ, NULL, Timer_Irq_Handler);

//允许Timer中断

IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 0x01);

}