JLinkDataStream

class JLinkDataStream

JLink data stream

Properties

buffer_hexdump	Return a hexdump string
buffer_unused	The amount of the device data buffer that is available
buffer_used	The amount of the device data buffer used
end_time	The absolute time in seconds to timeout reading or writing
is_opened	If the stream is opened to the device
max_read_size	The maximum amount of data to read
mode	The mode the for which the stream was opened, r or w
name	The name of the opened stream
read_data_available	The amount of data that is ready to be read by the python script
timeout	The maximum about of time in seconds to read or write data.
write_data_available	The amount of data that can immediately be written

Methods

__init__
close	Close the data stream with the device
flush	Wait while any pending data is transferred to/from the device
read	Read data from data stream opened for reading
read_all	The the specified amount of data
write	Write data to a data stream opened for writing

__init__(name, mode, ifc, stream_context)

Parameters:

• name (str) –

• mode (str) –

• ifc (DeviceInterface) –

• stream_context (dict) –

property name: str

The name of the opened stream

Return type:

str

property mode: str

The mode the for which the stream was opened, r or w

Return type:

str

property is_opened: bool

If the stream is opened to the device

Return type:

bool

property max_read_size: int

The maximum amount of data to read

Set to -1 to disable limit After each read, this value will decrement by the amount of data read. One this value reaches zero, it must be reset otherwise subsequent reads will always return zero.

Return type:

int

property timeout: float

The maximum about of time in seconds to read or write data. This is only used if the ‘timeout’ argument to the read() or write() APIs is None Set to -1 to never timeout

Return type:

float

property end_time: float

The absolute time in seconds to timeout reading or writing

Set to None to disable. If end_time > time.time(), then return from the read() or write() API

Return type:

float

property buffer_used: int

The amount of the device data buffer used

If the stream was opened for reading then this is the amount of data that was previous received from the device and is waiting to be read by the python script.

If the stream was opened for writing, then this is the amount of data that was previously written and is pending to be sent to the device.

Return type:

int

property buffer_unused: int

The amount of the device data buffer that is available

Return type:

int

property read_data_available: int

The amount of data that is ready to be read by the python script

Return type:

int

property write_data_available: int

The amount of data that can immediately be written

Return type:

int

property buffer_hexdump: str

Return a hexdump string

Return type:

str

close()

Close the data stream with the device

read(max_size=None, timeout=None)

Read data from data stream opened for reading

NOTE: The only returns the data that is immediately available. The amount of data returned may be less than max_size.

Return type:

bytes

Parameters:

• max_size (Optional[int]) –

• timeout (Optional[float]) –

read_all(amount, timeout=None, initial_timeout=None, throw_exception=True)

The the specified amount of data

Return type:

bytes

Parameters:

• amount (int) –

• timeout (Optional[float]) –

• initial_timeout (Optional[float]) –

write(data, timeout=None, flush=False)

Write data to a data stream opened for writing

Return type:

int

Parameters:

• data (bytes) –

• timeout (Optional[float]) –

flush(timeout=None)

Wait while any pending data is transferred to/from the device

Parameters:

timeout (Optional[float]) –