STM32 USB-FS-Device firmware library UM0424
14/81 Doc ID 13465 Rev 10
1.2.2 usb_int (.h , .c)
The usb_int module handles the correct transfer interrupt service routines; it offers the link
between the USB device protocol events and the library.
The STM32 USB-FS_Device peripheral provides two correct transfer routines:
● Low-priority interrupt: managed by the function CTR_LP() and used for control,
interrupt and bulk (in simple buffer mode).
● High-priority interrupt: managed by the function CTR_HP() and used for faster transfer
mode like Isochronous and bulk (in double buffer mode).
1.2.3 usb_mem (.h , .c)
The usb_mem copies a buffer data from the user memory area to the packet memory area
(PMA) and vice versa. It provides two differents functions:
void UserToPMABufferCopy(uint8_t *pbUsrBuf,uint16_t wPMABufAddr, uint16_t wNBytes);
void PMAToUserBufferCopy(uint8_t *pbUsrBuf,uint16_t wPMABufAddr, uint16_t wNBytes);
Where:
–
pbUsrBuf is the pointer to the user memory area generally in the product’s SRAM.
–
wPMABufAddr is the address in PMA ( 512-byte packet memory area dedicaded to
USB).
–
wNBytes is the number of bytes to be copied.
1.3 OTG-FS_Device peripheral interface
Table 3 presents the OTG-FS_Device peripheral interface modules.
l
1.3.1 otgd_fs_dev(.h, .c)
The otgd_fs_dev module provides the main high layer functions for handling the OTG-
FS_Device peripheral in device mode. It also contains the main functions for handling
endpoints.
The main functions are listed in Ta bl e 4 .
Table 3. OTG-FS_Device peripheral interface modules
File Description
otgd_fs_dev (.h , .c) OTG-FS_Device device mode high-layer management
otgd_fs_int (.h , .c) OTG-FS_Device interrupt handlers
otgd_fs_pcd (.h , .c) OTG-FS_Device device mode low-layer management
otgd_fs_cal (.h , .c) OTG-FS_Device peripheral control and status management (low layer).
otgd_fs_regs.h OTG-FS_Device peripheral register definitions
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