Description
Delay a task for a certain time.
Files
usbd_audio_os.h / usbd_audio_os.c
Prototype
Arguments
ms
Delay in milliseconds.
Returned Value
None.
Callers
Audio Class.
Implementation guidelines
- The RTOS layer code should delay the calling task by the specified number of milliseconds.
OS Tick Rate
Whenever possible, USBD_Audio_OS_DlyMs() should provide a delay with a 1 ms granularity. That is the OS tick rate should be set to produce at least 1 tick per millisecond. It will help for the audio class tasks scheduling as audio class works on a 1 ms frame basis. Moreover, a retry mechanism is implemented in the playback and record tasks in case a transfer cannot be queued on a given endpoint. The playback or record task waits 1 ms between each attempt before re-transmitting the transfer.