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Chapter 11
L11-1(3)
Configure read and write pipes with correct QoS and opaque data.
L11-1(4)
Add ISO/IEEE 11073 device specialization to PHDC instance.
L11-1(5)
Add class instance to high-speed configuration.
L11-1(6)
Add class instance to full-speed configuration.
11
11-3 CLASS INSTANCE COMMUNICATION
Now that the class instance has been correctly initialized, it’s time to exchange data. PHDC
offers 4 functions for that. Table 11-8 summarizes the communication functions provided by
the PHDC implementation. See Appendix F, “PHDC API Reference” on page 441 for a
complete API reference.
Function name
USBD_PHDC_RdPreamble()
USBD_PHDC_Rd()
USBD_PHDC_WrPreamble()
USBD_PHDC_Wr()
Operation
Reads metadata preamble.
Reads PHDC data.
Writes metadata preamble.
Writes PHDC data.
Table 11-8 PHDC Communication API Summary
11-3-1 COMMUNICATION WITH METADATA PREAMBLE
Via the preamble enabled callback, the application will be notified once host enables
metadata preamble. If metadata preambles are enabled, you should use the following
procedure to perform a read:
■
Call USBD_PHDC_RdPreamble() . Device expects metadata preamble from the host. This
function will return opaque data and the number of incoming transfers that the host
specified. Note that if the host disables preamble while the application is pending on
that function, it will immediately return with error “ USBD_ERR_OS_ABORT ”.
192
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