UM0851 datasheet(77/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

77/245

Figure 18.

USB Device performance at buffer length=4096

4.4.6

Configuration options

This section presents the general configuration options affecting the USB Device.

Kernel configurations

You can select the Linux kernel configurations from "make menuconfig". Their purpose is

mentioned in the table below.

FIFO configuration

160

16000

0.463621

282.7136821

0.588701

222.6461311

320

32000

0.914002

286.8090004

1.165675

224.8860103

400

40000

1.139009

287.6886838

1.454232

225.3285583

800

80000

2.340529

280.0050758

3.002247

218.2898342

1600

160000

4.680984

280.0095023

5.818188

225.2797606

3200

320000

9.356929

280.1602962

11.4153

229.6426524

Table 24.

USBD performance results (continued)

BlkSize

(KB)

Data Size

(KB)

BulkOUT time

(s)

BulkOUT

throughput

(Mbps)

BulkIN time (s)

BulkIN

throughput

(Mbps)

Table 25.

Linux kernel configuration

Configuration option

Comment

CONFIG_USB_GADGET

This enables USB gadget support in Linux kernel

CONFIG_USB_ZERO

This enables a test gadget driver (“zero”)

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