嵌入式实验报告2.doc

嵌入式实验报告一实验目的:1. 理解中断向量表的结构2. 理解中断处理的过程3. 学习编写中断处理程序的方法2 实验原理1. 打开cache，地址为0x01c000002. 初始化LED灯 PCONB4-5=0b00;使LED7和led8的控制孔为输出口3初始化定时器 TCFG0=199;TCFG1=3; /1/16TCMPB0=0;TCNTB0=9375;TCON=0x2;TCON=0x9;4初始化中断 关中断既cpsr寄存器的第七位置为1 INTCON=0x5;INTMOD=0x0; 工作在IRQ中断模式下INTMSK=0x7ffffff & (1 26 ) & (1 13 );timer0中断允许而后开中断既cpsr寄存器的第七位置05. 设置0x18处的指令 b 函数名6. 设置程序从0x0处运行，并使用之生成elf格式文件，以便烧写。三实验内容 1 写一个关于timer0中断的实验，使LED7，LED8可以交替亮 2 将中断程序进行烧写4. 实验代码export interrupt_startexport interrupt_stoparea mysection,code,readonlyentryinterrupt_startmrs r0,cpsrbic r0,r0,#0x80msr cpsr_c,r0mov pc,lrinterrupt_stopmrs r0,cpsrorr r0,r0,#0x80msr cpsr_c,r0mov pc,lrEndMain函数主要代码如下：void interrupt_init( void );void interrupt_start( void );void interrupt_stop( void );void led_init( void );void timer_init( void );void _irq timer_isr( void );int flag=1;#define PCONB *(volatile unsigned int *)0x01D20008)#define PDATB *(volatile unsigned int *)0x01D2000c)#define TCFG0 *(volatile unsigned int *)0x01D50000)#define TCFG1 *(volatile unsigned int *)0x01D50004)#define TCON *(volatile unsigned int *)0x01D50008)#define TCNTB0 *(volatile unsigned int *)0x01D5000c)#define TCMPB0 *(volatile unsigned int *)0x01D50010)#define INTCON*(volatile unsigned int *)0x01E00000)#define INTPND*(volatile unsigned int *)0x01E00004)#define INTMOD*(volatile unsigned int *)0x01E00008)#define INTMSK*(volatile unsigned int *)0x01E0000C)#define I_ISPR*(volatile unsigned int *)0x01E00020)#define I_ISPC*(volatile unsigned int *)0x01E00024)#define rSYSCFG(*(volatile unsigned *)0x1c00000)#define rNCACHBE0(*(volatile unsigned *)0x1c00004)#define rNCACHBE1(*(volatile unsigned *)0x1c00008)#define WRBUFOPT (0x08) #define SYSCFG_8KB (0x06 | WRBUFOPT) static void Cache_Init(void) rSYSCFG = 0xf; / rNCACHBE0 = 0x20001c00; /rNCACHBE1 = 0xe0003000;void _irq timer_isr( void )if( flag = 1 )PDATB=( PDATB & ( 3 4 ) ) | ( 0x2 4 );elsePDATB=( PDATB & ( 3 4 ) ) | ( 0x1 4 ) ;flag=flag 0x1;I_ISPC=1 13 ;void timer_init( void )TCFG0=199;TCFG1=3; /1/16TCMPB0=0;TCNTB0=9375;TCON=0x2;TCON=0x9;void led_init( void )PCONB=( PCONB & ( 3 4 ) );void interrupt_init( void )interrupt_stop();INTCON=0x5;INTMOD=0x0;INTMSK=0x7ffffff & (1 26 ) & (1 13 );/I_ISPC=0x3ffffff ; void Main( void )Cache_Init();led_init();interrupt_init();PDATB=( PDATB &