STM32 USB-FS Device开发套件：全面示例与演示

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STM32 USB-FS-Device开发套件是一套全面的硬件和软件解决方案，旨在帮助用户利用STM32系列微控制器进行USB Full-Speed (USB-FS) 设备的开发。该套件的核心内容包括针对不同USB传输类型（控制、中断、批量和同步）的示例代码和演示程序，以展示STM32 USB-FS Device库的强大功能。该套件的核心组件有： 1. **STM32 USB-FS Device库**：这是开发的基础，它包含了与默认端点和标准请求相关的所有处理流程，使得开发者能够轻松地实现USB设备的基本通信和数据交换。 2. **Device Firmware Upgrade (DFU) 示例**：这个控制传输演示展示了如何通过USB进行固件升级，这对于设备的维护和远程更新非常重要。 3. **Joystick鼠标示例**：中断传输在此得到应用，通过模拟鼠标输入，用户可以学习如何处理USB设备的中断事件，提高交互性。 4. **自定义HID（Human Interface Device）示例**：同样基于中断传输，这个示例展示了如何设计并实现一个定制的HID设备，如键盘或游戏手柄。 5. **存储设备演示**：通过批量传输，用户可以了解如何在USB设备上创建虚拟的存储空间，支持大容量数据传输。 6. **虚拟串口（Virtual COM Port）**：这个示例结合了中断和批量传输，提供了一个通用的串口通信接口，便于调试和数据流管理。 7. **Cable Loopback演示**：此演示同样涉及中断和批量传输，用于测试USB设备之间的数据通信，有助于验证设备功能。 8. **复合示例**：这个示例展示了如何组合不同的传输类型，实现多功能USB设备，可能包含多种功能的集成。 9. **USB语音播放器示例（USB speaker）**：最后，同步（即等时）传输在这里被用于音频数据的高效传输，适用于实时音频应用。值得注意的是，从这一版本开始，STM32F105/F107型号不再受支持，这意味着这些设备已由STM公司移除，开发者应选择其他支持的型号来继续使用此开发套件。STM32 USB-FS-Device开发套件提供了丰富的实践案例和理论指导，对于想要进入USB设备开发领域的工程师来说，是一个极具价值的学习资源。

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STM32 USB-FS-Device firmware library UM0424

14/85 Doc ID 13465 Rev 12

d) Endpoint KIND field

SetEP_KIND : void SetEP_KIND(uint8_t bEpNum)

ClearEP_KIND : void ClearEP_KIND(uint8_t bEpNum)

bEpNum = endpoint number

Set_Status_Out : void Set_Status_Out(uint8_t bEpNum)

Clear_Status_Out : void Clear_Status_Out(uint8_t bEpNum)

bEpNum = endpoint number

SetEPDoubleBuff : void SetEPDoubleBuff(uint8_t bEpNum)

ClearEPDoubleBuff : void ClearEPDoubleBuff(uint8_t bEpNum)

bEpNum = endpoint number

Correct Transfer Rx/Tx fields

ClearEP_CTR_RX : void ClearEP_CTR_RX(uint8_t bEpNum)

ClearEP_CTR_TX : void ClearEP_CTR_TX(uint8_t bEpNum)

bEpNum = endpoint number

e) Data Toggle Rx/Tx fields

ToggleDTOG_RX : void ToggleDTOG_RX(uint8_t bEpNum)

ToggleDTOG_TX : void ToggleDTOG_TX(uint8_t bEpNum)

bEpNum = endpoint number

f) Address field

SetEPAdress : void SetEPAddress(uint8_t bEpNum,uint8_t bAddr)

bEpNum = endpoint number

bAddr = address to be set

GetEPAdress : uint8_t GetEPAddress(uint8_t bEpNum)

bEpNum = endpoint number

UM0424 STM32 USB-FS-Device firmware library

Doc ID 13465 Rev 12 15/85

Buffer description table functions

These functions are used in order to set or get the endpoints’ receive and transmit buffer

addresses and sizes.

a) Tx/Rx buffer address fields

SetEPTxAddr : void SetEPTxAddr(uint8_t bEpNum,uint16_t wAddr);

SetEPRxAddr : void SetEPRxAddr(uint8_t bEpNum,uint16_t wAddr);

bEpNum = endpoint number

wAddr = address to be set (expressed as PMA buffer address)

GetEPTxAddr : uint16_t GetEPTxAddr(uint8_t bEpNum);

GetEPRxAddr : uint16_t GetEPRxAddr(uint8_t bEpNum);

bEpNum = endpoint number

return value : address value (expressed as PMA buffer address)

b) Tx/Rx buffer counter fields

SetEPTxCount : void SetEPTxCount(uint8_t bEpNum,uint16_t wCount);

SetEPRxCount : void SetEPRxCount(uint8_t bEpNum,uint16_t wCount);

bEpNum = endpoint number

wCount = counter to be set

GetEPTxCount : uint16_t GetEPTxCount(uint8_t bEpNum);

GetEPRxCount : uint16_t GetEPRxCount(uint8_t bEpNum);

bEpNum = endpoint number

return value : counter value

Double-buffered endpoints functions

To obtain high data-transfer throughput in bulk or isochronous modes, double-buffered mode

has to be programmed. In this operating mode some fields of the endpoint registers and

buffer description table cells have different meanings.

To ease the use of this feature several functions have been developed.

● SetEPDoubleBuff: An endpoint programmed to work in bulk mode can be set as

double-buffered by setting the EP-KIND bit. The function SetEPDoubleBuff()

accomplishes this task:

SetEPDoubleBuff : void SetEPDoubleBuff(uint8_t bEpNum);

bEpNum = endpoint number

● FreeUserBuffer: In double-buffered mode, the endpoints become mono-directional

and buffer description table cells of the unused direction are applied to handle a second

buffer.

Addresses and counters must be handled in a different way. Rx and Tx Addresses and

counter cells become Buffer0 and Buffer1 cells. Functions dedicated to this operating

mode are provided for in the library.

During a bulk transfer the line fills one buffer while the other buffer is reserved to the

application. A user application has to process data before the arrival of bulk needing a

buffer. The buffer reserved to the application has to be freed in time.

To free the buffer in use from the application, the FreeUserBuffer function is provided:

FreeUserBuffer: void FreeUserBuffer(uint8_t bEpNum, uint8_t

bDir);

bEpNum = endpoint number

UM0424 STM32 USB-FS-Device firmware library

Doc ID 13465 Rev 12 17/85

3.2.2 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 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).

3.2.3 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 different 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 dedicated to

USB).

● wNBytes is the number of bytes to be copied.

3.3 USB-FS-Device_Driver medium layer

Tabl e 6 presents the USB-FS-Device_Driver medium layer modules:

3.3.1 usb_init(.h,.c)

This module sets initialization routines and global variables that will be used in the library.

3.3.2 usb_core (.h , .c)

This module is the “kernel” of the library. It implements all the functions described in

Chapter 9 of the USB 2.0 specification.

Table 6. USB-FS-Device_Driver medium layer modules

File Description

usb_init (.h,.c) USB device initialization global variables

usb_core (.h , .c)

USB protocol management (compliant with chapter 9 of the USB 2.0

specification)

usb_sil (.h,.c)

Simplified functions for read & write accesses to the endpoints (abstraction

layer for the USB-FS_Device peripheral)

usb_def.h / usb_type.h USB definitions and types used in the library

platform_config.h Defines the hardware depending on the evaluation board used

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