S3C2440微控制器外部中断实验

ID:757182 · 发表于 2020-5-21 10:46

实验目的：掌握S3C2440微控制器I/O和外部中断的使用方法
实验内容：
用外部中断的方式，实现：
（1）按下K11，LED1闪烁2次；
（2）按下K12，LED2闪烁2次；
（3）按下K13，LED3闪烁2次；
（4）按下K14，LED4闪烁2次；
（5）按下K15，LED1与LED3一起闪烁2次；
（6）按下K16，LED2与LED4一起闪烁2次；
要求使用下降沿触发外部中断。

#include "2440addr.h"
#include "2440lib.h"
#define rGPBCON (*(volatile unsigned *)0x56000010) //Port B control
#define rGPBDAT (*(volatile unsigned *)0x56000014) //Port B data
#define rGPBUP (*(volatile unsigned *)0x56000018) //Pull-up control B
U16 i,a;
int delay(int times);
void INIT_interrupt(void);
static void __irq Eint1_ISR(void)
{
U8 j = 0;
for( j=0;i<2;i++){
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1c0; //LED1亮 1110
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
rSRCPND=(rSRCPND&~(0x1<<1))|(0x1<<1);
rINTPND=(rINTPND&~(0x1<<1))|(0x1<<1);
}
}
static void __irq Eint2_ISR(void)
{
U8 j = 0;
for(j=0;i<2;i++){
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1a0; //LED2亮 1101
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
rSRCPND=(rSRCPND&~(0x1<<2))|(0x1<<2);
rINTPND=(rINTPND&~(0x1<<2))|(0x1<<2 );
}
}
static void __irq Eint3_ISR(void)
{
U8 j = 0;
for(j=0;i<2;i++){
rGPBDAT= (rGPBDAT&~(0xf<<5))|0x160; //LED3亮 1011
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
rSRCPND=(rSRCPND&~(0x1<<3))|(0x1<<3);
rINTPND=(rINTPND&~(0x1<<3))|(0x1<<3 );
}
}
static void __irq Eint4_7_ISR(void)
{
U8 j = 0;
if(rEINTPEND == (rEINTPEND&~(0x1<<4))|(0x1<<4)){
for(j=0;i<2;i++){
rGPBDAT= (rGPBDAT&~(0xf<<5))|0x0e0; //LED4亮 0111
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
}
rEINTPEND=(1<<4);
ClearPending(BIT_EINT4_7);
}else if(rEINTPEND == (rEINTPEND&~(0x1<<5))|(0x1<<5)){
for(j=0;i<2;i++){
rGPBDAT= (rGPBDAT&~(0xf<<5))|0x140; //LED1,3亮 1010
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
}
rEINTPEND=(1<<5);
ClearPending(BIT_EINT4_7);
}else if(rEINTPEND == (rEINTPEND&~(0x1<<6))|(0x1<<6)){
for(j=0;i<2;i++){
rGPBDAT= (rGPBDAT&~(0xf<<5))|0xA0; //LED2,4亮 0101
delay(50000000);
rGPBDAT=(rGPBDAT&~(0xf<<5))|0x1E0; //全灭 1111
delay(50000000);
}
rEINTPEND=(1<<6);
ClearPending(BIT_EINT4_7);
}
rSRCPND=(rSRCPND&~(0x1<<1))|(0x1<<1);
rINTPND=(rINTPND&~(0x1<<1))|(0x1<<1 );
rEINTPEND=(rEINTPEND&~(0x7<<4))|(0x7<<4);
}
void INIT_interrupt()
{
rINTMSK=(rINTMSK&~(0x1<<1)); //中断屏蔽（INTMSK）寄存器
//56000050 11 10
rGPFCON = (rGPFCON&~(0x3<<2))|(0x2<<2);//GPF1设置为外部中断1
rGPFCON = (rGPFCON&~(0x3<<4))|(0x2<<4);//GPF2设置为外部中断2
rGPFCON = (rGPFCON&~(0x3<<6))|(0x2<<6);//GPF3设置为外部中断3
rGPFCON = (rGPFCON&~(0x3<<8))|(0x2<<8);//GPF4设置为外部中断4
rGPFCON = (rGPFCON&~(0x3<<10))|(0x2<<10);//GPF5设置为外部中断5
rGPFCON = (rGPFCON&~(0x3<<12))|(0x2<<12);//GPF6设置为外部中断6
rEXTINT1 =(rEXTINT1&~(0x7<<4))|(0x2<<4) //外部中断1，使用下降沿触发
rEXTINT1 =(rEXTINT1&~(0x7<<8))|(0x2<<8) //外部中断2，使用下降沿触发
rEXTINT1 =(rEXTINT1&~(0x7<<12))|(0x2<<12) //外部中断3，使用下降沿触发
rEXTINT1 =(rEXTINT1&~(0x7<<16))|(0x2<<16) //外部中断4，使用下降沿触发
rEXTINT1 =(rEXTINT1&~(0x7<<20))|(0x2<<20) //外部中断5，使用下降沿触发
rEXTINT1 =(rEXTINT1&~(0x7<<24))|(0x2<<24) //外部中断6，使用下降沿触发
pISR_EINT1=(U32)Eint1_ISR;//把EINT1的中断入口地址放进去
pISR_EINT2=(U32)Eint2_ISR;//把EINT2的中断入口地址放进去
pISR_EINT3=(U32)Eint3_ISR;//把EINT3的中断入口地址放进去
pISR_EINT4_7=(U32)Eint4_7_ISR;//把EINT4_7的中断入口地址放进去
rSRCPND=(rSRCPND&~(0xF<<1))|(0xF<<1); //初始化时也清除一下挂起寄存器
rINTPND=(rINTPND&~(0xF<<1))|(0xF<<1);
rEINTPEND=(rEINTPEND&~(0x7<<4))|(0x7<<4);
//如果有外部中断4-23，则中断挂起寄存器也要清零一下，中断屏蔽寄存器也要改为可服务
rINTMSK=(rINTMSK&~(0xF<<1))|(0x0<<1); //中断屏蔽（INTMSK）寄存器 EINT1\ENIT2\ENIT3\ENIT4_7使能
rEINTMASK = (rEINTMASK&~(0x7<<4))|(0x0<<4);//子中断屏蔽寄存器 EINT4\ENIT5\ENIT6使能
}
/* 自定义简单延迟程序 */
int delay(int times)
{
int i;
for(i=0;i<times;i++);
return 0;
}
void xmain(void)
{
ChangeClockDivider(3,1);
ChangeMPllValue(127,2,1); //405MHZ
//Rtc_Init(); //实时时钟初始化
Isr_Init();
Uart_Init(0, 115200);
Uart_Select(0);
rGPBCON=(rGPBCON & ~(0xFF<<10)) | (0x55<<10);//GPB5-8 set output
rGPBUP |= (0xFF<<5); //disable GPB pull up
INIT_interrupt();
while(1);
}

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ID:277550 · 发表于 2024-1-6 20:13

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S3C2440微控制器外部中断实验

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