initial.c

运行于c51单片机上的用keil c创建的C源程序,采用PDIUSBD12接口。

void P_HWInit(void)
{
  P0 = 0xFF;		    //初始化I/O口
  P1 = 0xFF;
  P2 = 0xFF;
  P3 = 0xFF;

  IT0 = 0;				//初始化中断
  EX0 = 1;
  PX0 = 0;
  EA = 1;

  D12SUSPD = 0;			//让器件不再挂起
  MCU_D12CS = 0x0;		//片选
}

void P_DataInit(void)
{
  
}

//断开USB总线连接
void disconnect_USB(void)
{
  D12_SetMode(D12_NOLAZYCLOCK, D12_SETTOONE | D12_CLOCK_12M);
}

//连接到USB总线
void connect_USB(void)
{
  DISABLE;
  B_D12_Lb = 0;
  B_CommFlg = 0;
  ENABLE;
  D12_SetDMA(0x0);		//设置D12工作模式
  D12_SetMode(D12_NOLAZYCLOCK|D12_SOFTCONNECT, D12_SETTOONE | D12_CLOCK_12M);
}

//USB总线重新连接(先断开，再连接)子程序
void reconnect_USB(void)
{
  unsigned long clk_cnt = 0x9000;
  D12SUSPD = 0;
  disconnect_USB();
  while(clk_cnt--);
  connect_USB();
}

//setup packet deal
void control_handler(void)
{
  unsigned char type, req;
  type = ControlData.DeviceRequest.bmRequestType & USB_REQUEST_TYPE_MASK;//USB_REQUEST_TYPE_MASK=(unsigned char)0x60
  req = ControlData.DeviceRequest.bRequest & USB_REQUEST_MASK;//USB_REQUEST_MASK=(unsigned char)0x0F
  
  if(type == USB_STANDARD_REQUEST)		//标准请求 define USB_STANDARD_REQUEST     (unsigned char)0x00
  {
    (*StandardDeviceRequest[req])();
  }
  else if (type == USB_VENDOR_REQUEST)		//厂商请求 0x40
  {
    (*VendorDeviceRequest[req])();
  }
  else  stall_ep0();
}

void usbserve(void)
{
  if (GETBIT(B_D12_Lb,SETUP))//define GETBIT(C_Sou,C_Bit)	(C_Sou & (0x01<<C_Bit))
  {
    DISABLE;				//define SETUP  1  //设置包
    CLRBIT(B_D12_Lb,SETUP);//define CLRBIT(C_Sou,C_Bit) (C_Sou &= ~(0x01<<C_Bit))
    control_handler();			//设置包控制处理
    ENABLE;
  } 
}