NXP Semiconductors LPC43Sxx, Руководство пользователя

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User manual Rev. 2.1 — 10 December 2015 770 of 1441
NXP Semiconductors
UM10503
Chapter 27: LPC43xx/LPC43Sxx USB API
– USB descriptors data structure ( Table 579 “_USB_CORE_DESCS_T class
structure” )
– USB device stack initialization parameter data structure ( Table 588
“USBD_API_INIT_PARAM class structure” ).
– USB device stack core API functions structure ( Table 591 “USBD_CORE_API
class structure” ).
•
Device Firmware Upgrade (DFU) class function driver
– DFU descriptors data structure ( Table 593 “USBD_DFU_INIT_PARAM class
structure” ).
– DFU class API functions structure. This module exposes functions which interact
directly with the USB device controller hardware (
Table 592 “USBD_DFU_API
class structure” ).
•
HID class function driver
– struct ( Table 572 “_HID_DESCRIPTOR class structure” ).
– struct ( Table 574 “_HID_REPORT_T class structure” ).
– USB descriptors data structure ( Table 595 “USBD_HID_INIT_PARAM class
structure” ).
– HID class API functions structure. This structure contains pointers to all the
functions exposed by the HID function driver module (
Table 596 “USBD_HW_API
class structure” ).
•
USB device controller driver
– Hardware API functions structure. This module exposes functions which interact
directly with the USB device controller hardware (
Table 596 “USBD_HW_API class
structure” ).
•
Mass Storage Class (MSC) function driver
– Mass Storage Class function driver initialization parameter data structure
(
Table 598 ).
– MSC class API functions structure. This module exposes functions which interact
directly with the USB device controller hardware (
Table 597 ).
27.4 Calling the USB device driver
A fixed location in ROM contains a pointer to the ROM driver table i.e. 0x1FFF 1FF8. The
ROM driver table contains a pointer to the USB driver table. Pointers to the various USB
driver functions are stored in this table. USB driver functions can be called by using a C
structure.
Figure 77 illustrates the pointer mechanism used to access the on-chip USB
driver.
typedef struct USBD_API
{
const USBD_HW_API_T* hw;
const USBD_CORE_API_T* core;
const USBD_MSC_API_T* msc;