Windows CE串口驱动简析(4)-PDD层实现:CPdd2410Serial1和CPdd2410Serial2(基于WinCE5.0 SMDK2410 BSP的Serial驱动)

最后就需要实现针对特定串口的CPdd2410Uart的继承类CPdd2410Serial1和CPdd2410Serial2.分别对应于串口UART0和UART2.
1.CPdd2410Serial1
CPdd2410Serial1主要进行了端口初始化,针对UART0进行IO Port的设置,同时还实现了Modem的一些函数.
(1)构造函数CPdd2410Serial1和析构函数~CPdd2410Serial1
CPdd2410Serial1初始化m_pIOPregs(IO控制寄存器虚拟地址)和fIsDSRSet(DSR属性).
~CPdd2410Serial1释放 m_pIOPregs.

CPdd2410Serial1(LPTSTR lpActivePath, PVOID pMdd, PHWOBJ pHwObj)
: CPdd2410Uart(lpActivePath, pMdd, pHwObj)
{
m_pIOPregs = NULL;
m_fIsDSRSet = FALSE;
}
~CPdd2410Serial1() {
if (m_pIOPregs!=NULL)
MmUnmapIoSpace((PVOID)m_pIOPregs,0);
}

2.Init
获取UART0的串口寄存器基址,映射IO地址空间,获取逻辑中断号,获取DSR,DTR地址,DSR/DTR端口号,最后调用基类Init函数.

virtual BOOL Init() {
PHYSICAL_ADDRESS    ioPhysicalBase = { S3C2410X_BASE_REG_PA_IOPORT, 0};
ULONG               inIoSpace = 0;
if (TranslateBusAddr(m_hParent,Internal,0, ioPhysicalBase,&inIoSpace,&ioPhysicalBase)) {
// Map it if it is Memeory Mapped IO.
m_pIOPregs = (S3C2410X_IOPORT_REG *)MmMapIoSpace(ioPhysicalBase, sizeof(S3C2410X_IOPORT_REG),FALSE);
}
if (m_pIOPregs) {
DDKISRINFO ddi;
if (GetIsrInfo(&ddi)== ERROR_SUCCESS &&
KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &ddi.dwIrq, sizeof(UINT32), &ddi.dwSysintr, sizeof(UINT32), NULL))
{
RegSetValueEx(DEVLOAD_SYSINTR_VALNAME,REG_DWORD,(PBYTE)&ddi.dwSysintr, sizeof(UINT32));
}
else
return FALSE;
m_pDTRPort = (volatile ULONG *)&(m_pIOPregs->GPHDAT);
m_pDSRPort = (volatile ULONG *)&(m_pIOPregs->GPHDAT);
m_dwDTRPortNum = 6;
m_dwDSRPortNum = 7;
return CPdd2410Uart::Init();
}
return FALSE;
};

3.SetDefaultConfiguration
SetDefaultConfiguration用来配置PORT H,设置引脚功能为UART0的RXD0,TXD0,GPH6为DTR,GPH7为DSR,使能RTS0,CTS0等.

virtual void    SetDefaultConfiguration() {
m_pIOPregs->GPHCON &= ~(0x3<<0 | 0x3<<2 | 0x3<<4 | 0x3<<6 | 0x3<<12 | 0x3<<14); // clear uart 0 - rx, tx
m_pIOPregs->GPHCON |= (0x2<<4 | 0x2<<6 | 0x1<<12 | 0x0<<14);
m_pIOPregs->GPHCON |= (0x2<<0 | 0x2<<2 );
m_pIOPregs->GPHUP  |= 0xc3;
CPdd2410Uart::SetDefaultConfiguration();
}

4.InitModem
InitModem直接调用基类InitModem函数.

virtual BOOL    InitModem(BOOL bInit) {
SetDTR(bInit);
return CPdd2410Uart::InitModem(bInit);
}

5.GetModemStatus
GetModemStatus获取Modem状态,首先调用基类GetModemStatus,然后读取DSR端口状态获取相应状态调用事件回调函数.

virtual ULONG   GetModemStatus() {
ULONG ulReturn = CPdd2410Uart::GetModemStatus();
ULONG ulEvent = 0;
m_HardwareLock.Lock();
BOOL fIsDSRSet = (((*m_pDSRPort) & (1<<m_dwDSRPortNum))==0);
if (fIsDSRSet != m_fIsDSRSet) {
ulEvent |= EV_DSR | EV_RLSD;
}
ulReturn |= (fIsDSRSet?(MS_DSR_ON|MS_RLSD_ON):0);
m_fIsDSRSet = fIsDSRSet;
m_HardwareLock.Unlock();
if (ulEvent!=0)
EventCallback(ulEvent,ulReturn);
return ulReturn;
}

6.SetDTR
SetDTR用来设置DTR引脚.

virtual void    SetDTR(BOOL bSet) {
if (bSet)
*m_pDTRPort &= ~(1<<m_dwDTRPortNum);
else
*m_pDTRPort |= (1<<m_dwDTRPortNum);
};

2.CPdd2410Serial2
CPdd2410Serial2与CPdd2410Serial1类似,由于DTR,DSR使用GPH6,GPH7(UART2的Rx & Tx),所以DTR,DSR使能的时候不能使用UART2.
除了DTR,DSR部分,其余实现与CPdd2410Serial1类似.

// CPdd2410Serial2 is only use for UART 2 which
// RTS CTS is use GPH0 GPH1
// DTR & DSR is USE GPH6 GPH7 which is UART2's Rx & Tx. You can not enable UART2 when this object is running.
class CPdd2410Serial2 : public CPdd2410Uart {
public:
CPdd2410Serial2(LPTSTR lpActivePath, PVOID pMdd, PHWOBJ pHwObj)
: CPdd2410Uart(lpActivePath, pMdd, pHwObj)
{
m_pIOPregs = NULL;
}
~CPdd2410Serial2() {
if (m_pIOPregs!=NULL)
MmUnmapIoSpace((PVOID)m_pIOPregs,0);
}
virtual BOOL Init() {
PHYSICAL_ADDRESS    ioPhysicalBase = { S3C2410X_BASE_REG_PA_IOPORT, 0};
ULONG               inIoSpace = 0;
if (TranslateBusAddr(m_hParent,Internal,0, ioPhysicalBase,&inIoSpace,&ioPhysicalBase)) {
// Map it if it is Memeory Mapped IO.
m_pIOPregs =(S3C2410X_IOPORT_REG *) MmMapIoSpace(ioPhysicalBase, sizeof(S3C2410X_IOPORT_REG),FALSE);
}
if (m_pIOPregs) {
DDKISRINFO ddi;
if (GetIsrInfo(&ddi)== ERROR_SUCCESS &&
KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &ddi.dwIrq, sizeof(UINT32), &ddi.dwSysintr, sizeof(UINT32), NULL))
{
RegSetValueEx(DEVLOAD_SYSINTR_VALNAME,REG_DWORD,(PBYTE)&ddi.dwSysintr, sizeof(UINT32));
}
else
return FALSE;
return CPdd2410Uart::Init();
}
return FALSE;
};
virtual void    SetDefaultConfiguration() {
m_pIOPregs->GPHCON &= ~(0x3<<12 | 0x3<<14); // clear uart 2 - rx, tx
m_pIOPregs->GPHCON |= (0x2<<12 | 0x2<<14);
m_pIOPregs->GPHUP |= 0xc0;
CPdd2410Uart::SetDefaultConfiguration();
}
virtual ULONG   GetModemStatus() {
return (CPdd2410Uart::GetModemStatus() | MS_CTS_ON);
}
volatile S3C2410X_IOPORT_REG * m_pIOPregs;
};

3.CSerialPDD * CreateSerialObject
CreateSerialObject创建了UART0或UART2的实例(UART1被用作调试串口)返回给MDD层调用.调用方式请见之前的文章:
http://blog.csdn.net/shevsten/archive/2010/06/08/5655749.aspx

CSerialPDD * CreateSerialObject(LPTSTR lpActivePath, PVOID pMdd,PHWOBJ pHwObj, DWORD DeviceArrayIndex)
{
CSerialPDD * pSerialPDD = NULL;
switch (DeviceArrayIndex) {
case 0:
pSerialPDD = new CPdd2410Serial1(lpActivePath,pMdd, pHwObj);
break;
case 1:
pSerialPDD = new CPdd2410Serial2(lpActivePath,pMdd, pHwObj);
break;
}
if (pSerialPDD && !pSerialPDD->Init()) {
delete pSerialPDD;
pSerialPDD = NULL;
}
return pSerialPDD;
}

4.DeleteSerialObject
对应的还有一个删除串口实例的函数DeleteSerialObject.

void DeleteSerialObject(CSerialPDD * pSerialPDD)
{
if (pSerialPDD)
delete pSerialPDD;
}

到这里串口驱动就简单分析到这里,简单介绍了驱动架构和详细介绍了用户需要实现的CSerialPDD的继承类CPdd2410Uart和CPdd2410Serial1/2. 关于MDD和PDD COMMON层的具体实现没有过多涉及,如有兴趣请参考相应代码.