串行设备驱动.pptVIP

串行设备驱动 博创科技 嵌入互动 主要内容 1、Windows CE.net串行设备简介 2、串口设备驱动 3、串行设备API简介 4、串口设备操作 5、红外设备简介 1、Windows CE.net串行设备简介 Windows CE.net串行设备 Windows CE.net的串行设备应用十分广泛 GPRS通信 智能数据终端 GPS定位系统 红外通讯设备 使用通用码流进行数据传输，与标准串口完全兼容 支持3线/9线串口方式 串口模型基本延续了桌面系统的风格和基本的API，但未封装成类 串口的7层结构 Netarm2410-S串行设备情况 UART0（3线） 标准格式化信息输出串口；基本通讯串口 UART1（3线） 基本通讯串口（未使用） UART2（3线） 红外通讯串口；基本通讯串口 2、串口设备驱动 串口设备驱动 是一种流驱动 BSP中提供的串口驱动模型较为复杂，在结构上也分层为MDD和PDD层 3、串行设备API简介 串口的API CreateFileOpens a serial port. GetCommStateFills in a device-control block — DCB structure — with the current control settings for a specified communication device. SetCommStateConfigures a communication device according to the specifications in a DCB structure. The function reinitializes all hardware and control settings, but does not empty I/O queues. GetCommTimeoutsRetrieves the time-out parameters for all read/write operations on a specified communication device. SetCommTimeoutsSets the time-out parameters for all read/write operations on a specified communication device. WriteFileWrites data to a serial port, which transfers data to the device at the other end of a serial connection. ReadFileReads data from a serial port, which receives data from a device at the other end of a serial connection. 串口的API SetCommMaskSpecifies a set of events to monitor for a communication device. GetCommMaskRetrieves the value of the event mask for a specified communication device. WaitCommEventWaits for an event to occur for a specified communication device. The set of events monitored by WaitCommEvent is contained in the event mask associated with the device handle. EscapeCommFunctionDirects a specified communication device to perform an extended function. Often used to set a serial port to IR mode. ClearCommBreakRestores character transmission for a specified communication device and places the transmission line in a non-break state. ClearCommErrorRetrieves communication error data and reports the current status of a specified communication device. 4、串口设备操