io_port.c

ARM入门学习源码

#include "44B.h"
#include "IO_Port.h"

/************************* PORTS ****************************/

void IO_PortInit(void)
{	     
    //16bit data bus configuration
      
    //PORT "A" GROUP
    //ADDR24 ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 ADDR18 ADDR17 ADDR16 ADDR0		      
    //  1,     1,	  1,     1,     1,     1,     1,	 1,     1,     1
    rPCONA=0x3ff;

    //PORT "B" GROUP
    //nGCS5 nGCS4 nGCS3 nGCS2 nGCS1 Output Output nSRAS nSCAS SCLK SCKE
    //  1,    1,    1,	  1,    1,    0,     0,	    1,    1,    1,  1
    rPCONB = 0x000007CF;
    rPDATB = 0x07EF;		//Beep Off;
    
    //PORT "C" GROUP
    //Input Input Input Input Input Input Input Input Input Input Input Input Input Input Input Input
    // 00	 00    00	 00	 00	   00	 00		00	   00	  00    00   00    00	00	  00	00
    rPCONC = 0x000000000;
    rPDATC = 0x0000;
    rPUPC |= 0xFFFF;

    //PORT "D" GROUP
    //Input Input Input Input Input Input Input Input 
    //  00    00    00    00    00    00    00    00 
    rPCOND = 0x0000;
    rPDATD = 0x00;
    rPUPD = 0xFF;

    //PORT "E" GROUP
    //Input Input Input Input InputInput Input Input Input
    //	00   00    00    00    00    00    00   00    00
    rPCONE=0x00000;
    rPDATE=0x000;
    rPUPE=0x1FF;

    //PORT "F" GROUP
    //Input Input Input Input Input Input Input Input Input
    // 000   000   000   000   00    00    00    00    00
    rPCONF=0x000000;
    rPDATF=0x000;
    rPUPF=0x1FF;

    //PORT "G" GROUP
    //Input Input Input Input Input Input Input Input 
    //  00    00    00    00    00    00    00    00
    rPCONG=0x00;
    rPDATG = 0x00;
    rPUPG = 0xFF;
    
    rSPUCR=0x3;  //pull-up disable

    rEXTINT=0x22222222;  //All EINT[7:0] will be falling edge triggered.
}