WinCE 5.0 SMDK2440BSP—— Leddriver分析

友善mini2440开发板 BSP包下的Led driver，作为驱动入门的第一课，可以了解到基本的流驱动程序。

#include <windows.h>
//#include <ceddk.h>
#include <nkintr.h>
#include <pm.h>
#include "pmplatform.h"
#include "Pkfuncs.h"
#include "s2440.h"

#define IO_CTL_LED_1_ON 0x01
#define IO_CTL_LED_2_ON 0x02
#define IO_CTL_LED_3_ON 0x03
#define IO_CTL_LED_4_ON 0x04
#define IO_CTL_LED_ALL_ON 0x05
#define IO_CTL_LED_1_OFF 0x06
#define IO_CTL_LED_2_OFF 0x07
#define IO_CTL_LED_3_OFF 0x08
#define IO_CTL_LED_4_OFF 0x09
#define IO_CTL_LED_ALL_OFF 0x0a

volatile IOPreg *s2440IOP = (IOPreg *)IOP_BASE;//IOPreg：IO口结构体
volatile INTreg *s2440INT = (INTreg *)INT_BASE;//INTreg：中断控制器结构体

BOOL mInitialized;
void Virtual_Alloc(); // Virtual allocation

void Virtual_Alloc()
{

// GPIO Virtual alloc
s2440IOP = (volatile IOPreg *) VirtualAlloc(0,sizeof(IOPreg),MEM_RESERVE, PAGE_NOACCESS);
if(s2440IOP == NULL) {
RETAILMSG(1,(TEXT("For s2440IOP: VirtualAlloc faiLED!/r/n")));
}
else {
if(!VirtualCopy((PVOID)s2440IOP,(PVOID)(IOP_BASE),sizeof(IOPreg),PAGE_READWRITE | PAGE_NOCACHE )) {
RETAILMSG(1,(TEXT("For s2440IOP: VirtualCopy faiLED!/r/n")));
}
}

}

BOOL WINAPI
DllEntry(HANDLE hinstDLL,
DWORD dwReason,
LPVOID /* lpvReserved */)
{
switch(dwReason)
{
case DLL_PROCESS_ATTACH:
DEBUGREGISTER((HINSTANCE)hinstDLL);
return TRUE;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
break;
#ifdef UNDER_CE
case DLL_PROCESS_EXITING:
break;
case DLL_SYSTEM_STARTED:
break;
#endif
}

return TRUE;
}

BOOL LED_Deinit(DWORD hDeviceContext)
{
BOOL bRet = TRUE;

RETAILMSG(1,(TEXT("USERLED: LED_Deinit/r/n")));

return TRUE;
}

/*GPIO口初始化，主要是配置寄存器GPBCON初始化，从代码中可以看出皆设置为OUTPUT模式*/
BOOL LEDGpioInit()
{
RETAILMSG(1,(TEXT("LED_Gpio_Setting----/r/n")));
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 10)) | (1<< 10); // GPB5 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 12)) | (1<< 12); // GPB6 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 14)) | (1<< 14); // GPB7 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 16)) | (1<< 16); // GPB8 == OUTPUT.
return TRUE;
}

DWORD LED_Init(DWORD dwContext)
{

RETAILMSG(1,(TEXT("LED_Init----/r/n")));

// 1. Virtual Alloc
Virtual_Alloc();

LEDGpioInit();

mInitialized = TRUE;
return TRUE;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
BOOL LED_IOControl(DWORD hOpenContext,
DWORD dwCode,
PBYTE pBufIn,
DWORD dwLenIn,
PBYTE pBufOut,
DWORD dwLenOut,
PDWORD pdwActualOut)
{
LEDGpioInit();
switch(dwCode)
{
case IO_CTL_LED_1_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<5);
break;
case IO_CTL_LED_2_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<6);
break;
case IO_CTL_LED_3_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<7);
break;
case IO_CTL_LED_4_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<8);
break;
case IO_CTL_LED_ALL_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0xF<<5);
break;
case IO_CTL_LED_1_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<5);
break;
case IO_CTL_LED_2_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<6);
break;
case IO_CTL_LED_3_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<7);
break;
case IO_CTL_LED_4_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<8);
break;
case IO_CTL_LED_ALL_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0xF<<5);
break;
default:
break;
}

RETAILMSG(1,(TEXT("LED:Ioctl code = 0x%x/r/n"), dwCode));
return TRUE;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD LED_Open(DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode)
{
RETAILMSG(1,(TEXT("USERLED: LED_Open/r/n")));
return TRUE;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
BOOL LED_Close(DWORD hOpenContext)
{
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&(0xF<<5);
RETAILMSG(1,(TEXT("USERLED: LED_Close/r/n")));
return TRUE;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void LED_PowerDown(DWORD hDeviceContext)
{
RETAILMSG(1,(TEXT("USERLED: LED_PowerDown/r/n")));

//RETAILMSG(1,(TEXT("CAMERA: LED_PowerDown, m_Dx = D%u, init %d /r/n"), m_Dx, mInitialized));
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void LED_PowerUp(DWORD hDeviceContext)
{
RETAILMSG(1,(TEXT("USERLED: LED_PowerUp/r/n")));

}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD LED_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count)
{
RETAILMSG(1,(TEXT("USERLED: LED_Read/r/n")));
return TRUE;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD LED_Seek(DWORD hOpenContext, long Amount, DWORD Type)
{
RETAILMSG(1,(TEXT("USERLED: LED_Seek/r/n")));
return 0;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD LED_Write(DWORD hOpenContext, LPCVOID pSourceBytes, DWORD NumberOfBytes)
{
RETAILMSG(1,(TEXT("USERLED: LED_Write/r/n")));
return 0;
}