Changeset 6b433a8 in mainline for uspace/lib/usb/include/usb/descriptor.h

Timestamp:

2017-11-20T19:14:31Z (6 years ago)

Author:

Salmelu <salmelu@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

27b0ea0

Parents:

d3086873

Message:

Isochronous transfers - endpoint initialization

File:

• uspace/lib/usb/include/usb/descriptor.h (modified) (1 diff)

uspace/lib/usb/include/usb/descriptor.h

@@ -240 +240 @@
          * For bulk endpoints, this field contains the amount of streams
          * supported by the endpoint.
-         * For isochronous endpoints, this field contains either maximum
-         * number of packets supported within a service interval, or
-         * whether an isochronous endpoint companion descriptor follows.
+         * For isochronous endpoints, this field contains maximum
+         * number of packets supported within a service interval.
+         * Warning: the values returned by macros may not make any sense
+         * for specific endpoint types.
          */
         uint8_t attributes;
 #define SS_COMPANION_MAX_STREAMS(attributes) \
         (attributes & 0x1f)
+#define SS_COMPANION_MULT(attributes) \
+        (attributes & 0x3)
         /** The total number of bytes this endpoint will transfer
          * every service interval (SI).