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Chapter 11
11-3-2 COMMUNICATION WITHOUT METADATA PREAMBLE
If device does not support metadata preamble or if it supports them but it has not been
enabled by the host, you should not call
USBD_PHDC_RdPreamble()
and
USBD_PHDC_WrPreamble() .
11
11-4 RTOS QOS-BASED SCHEDULER
Since it is possible to send data with different QoS using a single bulk endpoint, you might
want to prioritize the transfers by their QoS latency (medium latency transfers processed
before high latency transfers, for instance). This kind of prioritization is implemented inside
PHDC μC/OS-II and μC/OS-III RTOS layer. Table 11-9 shows the priority value associated
with each QoS latency (the lowest priority value will be treated first).
QoS latency
Very high latency
High latency
Medium latency
QoS based scheduler associated priority
3
2
1
Table 11-9 QoS Based Scheduler Priority Values
For instance, let’s say that your application has 3 tasks. Task A has an OS priority of 1, task
B has an OS priority of 2 and task C has an OS priority of 3. Note that a low priority number
indicates a high priority task. Now say that all 3 tasks want to write PHDC data of different
QoS latency. Task A wants to write data that can have very high latency, task B wants to
write data that can have medium latency, and finally, task C wants to write data that can
have high latency. Table 11-10 shows a summary of the tasks involved in this example.
Task
A
B
C
QoS latency of data to
write
Very high
Medium
High
OS priority
1
2
3
QoS priority of data to
write
3
1
2
Table 11-10 QoS-Based Scheduling Example
196
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