NIOSTIMER中断的相关笔记

NIOS

TIMER中止相关笔记NIOSTIMER中止试验一、开发环境及试验目（1）、开发环境:硬件:DE2—70开发板软件:QuartusII9.0sp2WebEditionNIOSIIEDC9.0NIOSIDE（2）、试验目:深入了解TIMER中止,学会写TIMER中止函数,学会调用TIMER中止二、相关知识、资料（1）状态寄存器:status:TO:计数器递减至0时置1,并保持,直到软件修改为0RUN:定时器运行时为1,停止时为0,不能被软件改写（2）控制寄存器（control）:ITO:若为1则TIMER递减至0时发出中止,不然中止被屏蔽CONT:为1时定时器连续工作,为0时定时器只工作一次Start、stop:分别用来开启定时器和停止定时器,只需置1,不能同时置1（3）周期计数器:Periodl&Periodh（4）定时器快照寄存器:(Snapl&Snaph)NIOS中访问定时器头文件:Altera_Avalon_timer_regs.h该文件:1、读写状态寄存器:IORD_ALTERA_AVALON_TIMER_STATUS(base)IOWR_ALTERA_AVALON_TIMER_STATUS(base,data)2、读写控制寄存器:IORD_ALTERA_AVALON_TIMER_CONTROL(base)IOWR_ALTERA_AVALON_TIMER_CONTROL(base,data)3、读写周期寄存器IORD_ALTERA_AVALON_TIMER_PERIODL(base)IOWR_ALTERA_AVALON_TIMER_PERIODL(base,data)IORD_ALTERA_AVALON_TIMER_PERIODH(base)IOWR_ALTERA_AVALON_TIMER_PERIODH(base,data)4、读写计数器快照寄存器IORD_ALTERA_AVALON_TIMER_SANPL(base)IOWR_ALTERA_AVALON_TIMER_SANPL(base,data)IORD_ALTERA_AVALON_TIMER_SANPH(base)IOWR_ALTERA_AVALON_TIMER_SANPH(base,data)三、试验内容（内容为大量截图新浪博客不方便上传,懒上传了,仅上传NIOS源程序）#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"staticvoidTimer_ISR_Init(void);//setinterrupteralt_u8i=0;intmain(void){printf("\nmainfunction!\n");Timer_ISR_Init();//setinterrupterfunctionwhile(1){usleep(10000);}return0;}//Timer1alt_u8LED1=0;staticvoidTimer1_Irq_Handler(void*context,alt_u32id){printf("\nTimers1INTERRUPT!\n");LED1++;IOWR_ALTERA_AVALON_PIO_DATA(LED1_BASE,LED1);IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER1_BASE,0);IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER2_BASE,0x07);}//Timer2alt_u8LED2=0;alt_u8K;alt_u32Timer_Prd[]={25000000,12500000,6250000,3125000};staticvoidTimer2_Irq_Handler(void*context,alt_u32id){printf("\nTimers2INTERRUPT!\n");LED2=(LED2+1)%4;IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER2_BASE,Timer_Prd[LED2]);IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER2_BASE,0);IOWR_ALTERA_AVALON_PIO_DATA(LED2_BASE,LED2);K=IORD_ALTERA_AVALON_PIO_DATA(K1_BASE)&0x01;if(K)IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER3_BASE,0x07);elseIOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER3_BASE,0x0a);IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER2_BASE,0);}//Timer3alt_u8LED3=0;staticvoidTimer3_Irq_Handler(void*context,alt_u32id){printf("\nTimers3INTERRUPT!\n");LED3++;IOWR_ALTERA_AVALON_PIO_DATA(LED3_BASE,LED3);IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER3_BASE,0);}staticvoidTimer_ISR_Init(void){printf("\nINTERRUPTerfunction!\n");//timer1IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER1_BASE,0);alt_irq_register(TIMER1_IRQ,NULL,Timer1_Irq_Handler);IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER1_BASE,0x01);//timer2IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER2_BASE,0);alt_irq_register(TIMER2_IRQ,NULL,Timer2_Irq_Handler);IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER2_BASE,0x01);//timer3IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER3_BASE,0);alt_irq_register(TIMER3_IRQ,NULL,Timer3_Irq_Handler);IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER3_BASE,0x01);}（英文太差,写注释写很差,估量就自己能看懂,见笑）四、试验心得:部分资料写在试验前TIMER资料中总结在NIOS中C程序编写所应有格式如上例所表示:在一个时钟初始化中需写以下三句话:1、TIMER状态寄存器设置:开启TIMERIOWR_ALTERA_AVALON_TIMER_STATUS(TIMER1_BASE,0);2、中止注册,函数内为:中止号,空指针,中止函数alt_irq_register(TIMER1_IRQ,NULL,Timer1_Ir