key.c

SPI接口控制 SD卡 并实现FAT16文件系统spi_contrl_sdcard_fat16.rar

//在LPC2148中BP8--BP3对应与P0.10-P0.15 
//其为低电平有效    
//在IO初始化时，“0”代表输入，“1”代表输出 
/*  BP6  BP7  BP8  
    BP3  BP4  BP5   
对应的按键编号：  
	  1    2   3
	  4    5   6     
*/
#include"lpc214x.h"	
#include"PCF8833.H"
#include"key.h" 
#include"sd.h"  

INT16U file_num0=0;  
INT16U file_id=0;

extern folder_father;

void delay0()
{
    int a0,b;
	for(a0=1;a0<20000;a0++)
	for(b=1;b<200;b++)
	;
}


key_scan()
{
     int a=0;
	 INT8U key=0;
     a=IO0PIN;
	 a=a&0X0000FC00;
	 a=a>>10;
	 switch(a)
	 {
	     case  0x3e: key=3;	   //对应于BP8
		 break;
		 case  0x3d: key=2;	   //对应于BP7
		 break;
		 case  0x3b: key=1;	   //对应于BP6
		 break;
		 case  0x37: key=6;	   //对应于BP5
		 break;
		 case  0x2f: key=5;	   //对应于BP4
		 break;
		 case  0x1f: key=4;	   //对应于BP3
		 break;
		 default: key=0;  
		 break;
	 }
	 return(key);
}


LIST_key_dispose(INT8U key,INT16U file_num,INT32U root_add,INT8U Buffer)
{	
    INT8U y=file_id*16;
	if(file_num0!=0)
	{
	if(file_num!=file_num0)  
	     file_num=file_num0;
	}
	switch(key)
	{
	    case 2:	PutString(120,y," ",0xf800,0xffff); 
		        IO0SET=0x80000000;		    //检测按键是否使能，若没使能，检查JP5跳线，将其短接 
	            delay0();
	            IO0CLR=0x80000000;
		       file_id=file_id-1;
		       if(file_id>=file_num)   
			        file_id=file_num-1;
					break;
		case 5:	PutString(120,y," ",0xf800,0xffff);
		        IO0SET=0x80000000;		    //检测按键是否使能，若没使能，检查JP5跳线，将其短接 
	            delay0();
	            IO0CLR=0x80000000;
		       file_id=file_id+1;
		       if(file_id==file_num) 
			        file_id=0;
					break;
		case 3:	PutString(120,y," ",0xf800,0xffff);
		        delay0();
		        file_num0=read_file(file_id,Buffer);	
				file_id=0;
		        break;
		case 6:	file_num0=SD_List(folder_father,Buffer);
		        file_id=0;
		        break;	
		default: break;
	 }
	 LIST_dispose(file_id);
     
}