原创【转】2440 WinCE操作GPIO

 2011-9-12 15:17  1250 4 4 分类: 软件与OS

******************************************************************************
NOTE：空间对代码支持不友好，想方便读代码者，请进：
www.cnblogs.com/DotCpp/archive/2010/07/29/1788082.html
******************************************************************************

Windows CE系统将GPIO的实地址(例如2440的GPIO的基地址为0x56000000)映射到虚拟地址空间（GPIO对应为0xB1600000），这样，通过对这段虚拟地址空间的操作，就能够完成对GPIO或数就是 VirtualAlloc和VirtualCopy。下面以操作Samsung S3C2440的GPIO为例，讲述这个步骤：
1.首先在BSP中的s2440.h文件，找到虚拟地址映射以及操作GPIO的寄存器结构体(这个在自己制作一些特殊设备的BSP时，会依据需要而发生更改)

#define IOP_BASE      0xB1600000 // 0x56000000
typedef struct {
unsigned int rGPACON;            // 00
unsigned int rGPADAT;
unsigned int rPAD1[2];

unsigned int rGPBCON;            // 10
unsigned int rGPBDAT;
unsigned int rGPBUP;
unsigned int rPAD2;

unsigned int rGPCCON;            // 20
unsigned int rGPCDAT;
unsigned int rGPCUP;
unsigned int rPAD3;

unsigned int rGPDCON;            // 30
unsigned int rGPDDAT;
unsigned int rGPDUP;
unsigned int rPAD4;

unsigned int rGPECON;            // 40
unsigned int rGPEDAT;
unsigned int rGPEUP;
unsigned int rPAD5;

unsigned int rGPFCON;            // 50
unsigned int rGPFDAT;
unsigned int rGPFUP;
unsigned int rPAD6;

unsigned int rGPGCON;            // 60
unsigned int rGPGDAT;
unsigned int rGPGUP;
unsigned int rPAD7;

unsigned int rGPHCON;            // 70
unsigned int rGPHDAT;
unsigned int rGPHUP;
unsigned int rPAD8;

unsigned int rMISCCR;            // 80
unsigned int rDCKCON;
unsigned int rEXTINT0;
unsigned int rEXTINT1;
unsigned int rEXTINT2;            // 90
unsigned int rEINTFLT0;
unsigned int rEINTFLT1;
unsigned int rEINTFLT2;
unsigned int rEINTFLT3;        // A0
unsigned int rEINTMASK;
unsigned int rEINTPEND;
unsigned int rGSTATUS0;        // AC
unsigned int rGSTATUS1;        // B0
unsigned int rGSTATUS2;        // B4 ;;; SHL
unsigned int rGSTATUS3;        // B8
unsigned int rGSTATUS4;        // BC

unsigned int rFLTOUT;            // C0
unsigned int rDSC0;
unsigned int rDSC1;
unsigned int rMSLCON;

unsigned int rGPJCON;            // D0
unsigned int rGPJDAT;
unsigned int rGPJUP;
unsigned int rPAD9;

}IOPreg;

    二、因为我用的mini2440开发板的GPB0接在蜂鸣器上，所以我以操作GPB0为例编写代码。这样给GPB0一个高电平，那么蜂鸣器就会响，反之蜂鸣器就会停止发声

#ifdef __cplusplus
extern "C"
{
#endif
BOOL VirtualCopy( PVOID, PVOID, DWORD, DWORD );
#ifdef __cplusplus
}
#endif

void GPIO()        //通过GPIO控制蜂鸣器
{
volatile IOPreg *v_pIORegs;
v_pIORegs = (volatile IOPreg *)VirtualAlloc(0, sizeof(IOPreg), MEM_RESERVE, PAGE_NOACCESS);
if(v_pIORegs)
{
if(VirtualCopy((PVOID)v_pIORegs, (PVOID)IOP_BASE, sizeof(IOPreg), PAGE_READWRITE | PAGE_NOCACHE))
{
v_pIORegs->rGPBCON = 1;                    //将GPB0设置为OUTPUT
v_pIORegs->rGPBDAT = 0x3ff;               //设置为高电平，蜂鸣器发声
Sleep(3000);
v_pIORegs->rGPBDAT = 0;                     //恢复为低电平，蜂鸣器停止发声
}

VirtualFree((LPVOID)v_pIORegs, 0, MEM_RELEASE);
v_pIORegs = NULL;
}
}

@written by .cpp

写原创有奖励！2024面包板原创奖励正在进行中