clear_serialT_clear_serialClearSerialClearSerialclear_serial (Operator)

名称

clear_serialT_clear_serialClearSerialClearSerialclear_serial — 清除串行连接的缓冲区。

签名

clear_serial( : : SerialHandle, Channel : )

描述

clear_serialclear_serialClearSerialClearSerialClearSerialclear_serial discards data written to the serial device referred to by SerialHandleSerialHandleSerialHandleSerialHandleserialHandleserial_handle, but not transmitted (ChannelChannelChannelChannelchannelchannel = 'output'"output""output""output""output""output"), or data received, but not read (ChannelChannelChannelChannelchannelchannel = 'input'"input""input""input""input""input"), or performs both these operations at once (ChannelChannelChannelChannelchannelchannel = 'in_out'"in_out""in_out""in_out""in_out""in_out").

执行信息

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

This operator modifies the state of the following input parameter:

SerialHandleSerialHandleSerialHandleSerialHandleserialHandleserial_handle

During execution of this operator, access to the value of this parameter must be synchronized if it is used across multiple threads.

参数

SerialHandleSerialHandleSerialHandleSerialHandleserialHandleserial_handle (input_control, state is modified) serial → (handle)

Serial interface handle.

ChannelChannelChannelChannelchannelchannel (input_control) string → (string)

Buffer to be cleared.

默认值： 'input' "input" "input" "input" "input" "input"

值列表： 'in_out'"in_out""in_out""in_out""in_out""in_out", 'input'"input""input""input""input""input", 'output'"output""output""output""output""output"

结果

If the parameters are correct and the buffers of the serial device could be cleared, the operator clear_serialclear_serialClearSerialClearSerialClearSerialclear_serial returns the value 2 ( H_MSG_TRUE) . Otherwise an exception is raised.

可能的前置算子

open_serialopen_serialOpenSerialOpenSerialOpenSerialopen_serial

可能的后继算子

read_serialread_serialReadSerialReadSerialReadSerialread_serial, write_serialwrite_serialWriteSerialWriteSerialWriteSerialwrite_serial

另见

read_serialread_serialReadSerialReadSerialReadSerialread_serial

模块

Foundation

算子