BaseType_t xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer,
size_t xTriggerLevel );
A stream buffer’s trigger level is the number of bytes that must be in the
stream buffer before a task that is blocked on the stream buffer to
wait for data is moved out of the blocked state. For example, if a task is
blocked on a read of an empty stream buffer that has a trigger level of 1
then the task will be unblocked when a single byte is written to the buffer
or the task’s block time expires. As another example, if a task is blocked
on a read of an empty stream buffer that has a trigger level of 10 then the
task will not be unblocked until the stream buffer contains at least 10 bytes
or the task’s block time expires. If a reading task’s block time expires
before the trigger level is reached then the task will still receive however
many bytes are actually available. Setting a trigger level of 0 will result
in a trigger level of 1 being used. It is not valid to specify a trigger
level that is greater than the buffer size.
A trigger level is set when the stream buffer is created, and can be modified
Stream buffer functionality is enabled by including the FreeRTOS/source/stream_buffer.c
source file in the build.
The handle of the stream buffer being updated.
The new trigger level for the stream buffer.
If xTriggerLevel was less than or equal to the steam buffer’s length then
the trigger level will be updated and pdTRUE is returned. Otherwise pdFALSE
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