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Configuration
4
Call USBD_MSC_LunAdd()
Lastly, you add a logical unit to the MSC interface by calling this function. You will
specify the type and volume of the logical unit you want to add as well as device details
such as vendor ID, product ID, product revision level and read only. Logical units are
added by a device driver string name composed of the storage device driver name and
the logical unit number as follows: <device_driver_name>:<logical_unit_number>: .
The logical unit number starts counting from number 0. For example, if a device has
only one logical unit, the <logical_unit_number> specified in this field should be 0.
10
Listing 10-1 shows how the latter functions are called during MSC initialization.
USBD_ERR
CPU_INT08U
CPU_BOOLEAN
err;
msc_nbr;
valid;
USBD_MSC_Init(&err);
if (err != USBD_ERR_NONE){
return (DEF_FAIL);
}
msc_nbr = USBD_MSC_Add(&err);
if (cfg_hs != USBD_CFG_NBR_NONE){
valid = USBD_MSC_CfgAdd (msc_nbr,
dev_nbr,
cfg_hs,
&err);
if (valid != DEF_YES) {
return (DEF_FAIL);
}
}
if (cfg_fs != USBD_CFG_NBR_NONE){
valid = USBD_MSC_CfgAdd (msc_nbr,
(1)
(2)
(3)
(4)
dev_nbr,
cfg_fs,
&err);
if (valid != DEF_YES) {
return (DEF_FAIL);
}
}
175
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