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Chapter 11
If your application needs to send low latency / good reliability data, the class will need
to allocate an interrupt endpoint. The interval of the endpoint will be specified in this
call as well.
3
Call USBD_PHDC_RdCfg() and USBD_PHDC_WrCfg()
The next step is to call USBD_PHDC_RdCfg() and USBD_PHDC_WrCfg() . These functions
11
will let you set the latency / reliability bins that the communication pipe will carry. Bins
are listed in Table 11-7. It will also be used to specify opaque data to send within extra
endpoint metadata descriptor (see “USB Device Class Definition for Personal Healthcare
Devices”, Release 1.0, Section 5 for more details on PHDC extra descriptors)..
Name
USBD_PHDC_LATENCY_VERYHIGH_RELY_BEST
USBD_PHDC_LATENCY_HIGH_RELY_BEST
USBD_PHDC_LATENCY_MEDIUM_RELY_BEST
USBD_PHDC_LATENCY_MEDIUM_RELY_BETTER
USBD_PHDC_LATENCY_MEDIUM_RELY_GOOD
USBD_PHDC_LATENCY_LOW_RELY_GOOD
Description
Very-high latency, best reliability.
High latency, best reliability.
Medium latency, best reliability.
Medium latency, better reliability.
Medium latency, good reliability.
Low latency, good reliability.
Table 11-7 Listing of QoS Bins
4
Call USBD_PHDC_11073_ExtCfg() (optional)
If PHDC instance uses ISO/IEEE 11073 based data and messaging protocol, a call to this
function will let you configure the device specialization code(s).
5
Call USBD_PHDC_CfgAdd()
Finally, once the class instance is correctly configured and initialized, you will need to
add it to a USB configuration. This is done by calling USBD_PHDC_CfgAdd() .
190
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