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Class Instance Concept
USBD_ERR
CPU_INT08U
CPU_INT08U
err;
class_0;
class_1;
7
USBD_XXXX_Init(&err);
class_0 = USBD_XXXX_Add(&err);
class_1 = USBD_XXXX_Add(&err);
USBD_XXXX_CfgAdd(class_0, dev_nbr, cfg_0, &err);
USBD_XXXX_CfgAdd(class_1, dev_nbr, cfg_0, &err);
USBD_XXXX_CfgAdd(class_0, dev_nbr, cfg_1, &err);
USBD_XXXX_CfgAdd(class_1, dev_nbr, cfg_1, &err);
(1)
(2)
(3)
(4)
(5)
(6)
(6)
Listing 7-4 Multiple Class Instances - FS Device (2 Configurations and Multiple Interfaces) - Code
L7-4(1)
Initialize the class. Any internal variables, structures, and class RTOS port will
be initialized.
L7-4(2)
Create the class instance, class_0 . The function USBD_XXXX_Add() allocates a
class control structure associated to class_0 .
L7-4(3)
Create the class instance, class_1 . The function USBD_XXXX_Add() allocates
another class control structure associated to class_1 .
L7-4(4)
Add the class instance,
class_0 , to the configuration,
cfg_0 .
USBD_XXXX_CfgAdd() will create the interface 0, interface 1, alternate
interfaces, and the associated endpoints IN and OUT. The class instance
number, class_0 , will be used for any data communication on interface 0 or
interface 1.
L7-4(5)
Add the class instance,
class_1 , to the configuration,
cfg_0 .
USBD_XXXX_CfgAdd() will create the interface 2, interface 3 and their
associated endpoints IN and OUT. The class instance number, class_1 , will be
used for any data communication on interface 2 or interface 3.
L7-4(6)
Add the same class instances, class_0 and class_1 , to the other
configuration, cfg_1 .
107
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