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SEGGER emUSB-Device

Memory footprint

emUSB-Device is designed to fit many kinds of embedded design requirements. Several features can be excluded from a build to get a minimal system. The code size depends on the API functions called by the application. The code was compiled with the SEGGER compiler for a Cortex-M4 CPU with size optimization. Note that the values are only valid for an average configuration.

The following table shows the approximate ROM and RAM requirements of emUSB-Device

ComponentROMRAMNote
USB core5.5 KByte1.0 KByte 
Bulk2.0 KByte0.1 KByte 
CDC1.3 KByte0.1 KByte 
HID1.5 KByte0.1 KByte 
MSD4.8 KByte0.5 KByte+ size of file system
+ configurable sector buffer of minimum 512 bytes (RAM)
MTP14.4 KByte1.7 KByte+ size of file system
+ configurable file data buffer of minimum 512 bytes RAM)
+ configurable object buffer (typically 4 kBytes RAM)
Printer1.0 KByte2.1 KByte 
RNDIS5.3 KByte1.5 KByte+ size of the IP stack
ECM2.8 KByte0.2 KByte+ size of the IP stack
IP-Over-USB7.1 KByte1.7 KByte+ size of the IP stack
VirtualMSD8.1 KByte1.0 KByte+ heap of minimum 1700 bytes RAM
DFU1.0 KByte0.0 KByte 
AUDIO3.6 KByte0.2 KByte+ static configuration data
MIDI1.8 KByte0.0 KByte 
CCID1.2 KByte0.0 KByte 
USB target driver1.3 - 3.6 KByte0.0 - 7.6 KByte 

Additionally 64, 512 or 1024 Byte (for full-speed, high-speed and SuperSpeed devices, respectively) of RAM are necessary for each OUT-endpoint as a data buffer. This buffer is assigned within the application.

全球总部

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