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Mass Storage Class – Bulk-Only Transport

USB

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非常详细地描述了USB的BBB链接过程。是英文的，由Shakthi Kannan著，2007

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USB Simply Buffered (USB)

Mass Storage Class – Bulk-Only Transport

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version

1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover

Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”.

Environment

● Debian Etch 4.0.

● x86 system.

● Sandisk Cruzer Mini 256 MB USB thumb drive.

The mass storage devices that comply with USB Mass Storage Class Specifications are supported by the USB Mass Storage Class Working

Group. The various specifications are:

● USB Mass Storage Class Control/Bulk/Interrupt (CBI) Transport

● USB Mass Storage Class Bulk-Only Transport

● USB Mass Storage Class UFI Command Specification

● USB Mass Storage Class Bootability Specification

● USB Mass Storage Class Compliance Test Specification

Most mass-storage devices follow the Bulk-Only Transport specification. This specification is available in usbmassbulk_10.pdf. Reading

“USB Simply Buffered – Device Enumeration” is a pre-requisite for this documentation.

There is a Command/Data/Status protocol that is followed:

● Command Block Wrapper (CBW)

● Data Transfer (IN/OUT)

● Command Status Wrapper (CSW)

SCSI Primary Commands -2 (SPC-2) specification, and SCSI Block Commands – 2 (SBC-2) commands are used by USB, and follow SCSI

emulation for communication with the device for mass storage devices. The data transfer phase is optional if the host and device decide

not to have one.

So, the commonly used commands are:

● GetMaxLun

● INQUIRY

● TEST UNIT READY

● READ CAPACITY

● MODE SENSE

● REQUEST SENSE

● READ

● WRITE

The Sandisk USB thumb drive was connected to a GNU/Linux host PC, and it got automounted. A small file was copied to the disk, and

finally unmounted.

The commands can be issued anytime when the device is in configured state.

The packet details on the transactions for each of the requests/commands are explained in detail:

1. GetMaxLun

GetMaxLun request consists of the following transactions:

● SETUP transaction (->)

● IN transaction (<-)

● OUT transaction (->)

Host Device

SETUP transaction

IN transaction

OUT transaction

1.1 SETUP transaction

The SETUP transaction has the following three packets:

● SETUP packet (->)

● DATA0 packet (->)

● ACK packet (<-)

Host Device

1.1.1 SETUP packet

A SETUP packet consists of:

L M L M L M L M

PID !PID Function Address Endpoint CRC

(bits) 4 4 7 4 5

Values:

L M L M L M L M

1011 0100 1100 000 0000 01010

(bits) 4 4 7 4 5

USB is little-endian. LSB goes out of the wire, first.

Displaying from MSB to LSB:

M L

01010 0000 000 0011 0010 1101

Regrouping in groups of 4-bits:

M L

0101 0000 0000 0011 0010 1101

Hex values:

M L

5 0 0 3 2 D

剩余161页未读，继续阅读

xgqsa

2013-03-09

不错,可以帮助理解内核中USB Mass Storage中的协议部分

System.Threading.SynchronizationLockException HResult=0x80131518 Message=Object synchronization method was called from an unsynchronized block of code. Source=System.Private.CoreLib StackTrace: 在 System.Threading.Monitor.Exit(Object obj) 在 CMOSImageSensor.T2001.GetSsrMode() 在 D:\dmoco\work_Project\AE_DVS_HDR\T2001AutoExposureControl\T2001_mass-storage-tool_using_net6\CMOSImageSensor\T2001\T2001.cs 中: 第 433 行在 CMOSImageSensor.T2001.GetMaxIntegrationVblk() 在 D:\dmoco\work_Project\AE_DVS_HDR\T2001AutoExposureControl\T2001_mass-storage-tool_using_net6\CMOSImageSensor\T2001\T2001.cs 中: 第 610 行在 raw_data_mass_storage.AE_mode.AE_DVS_Form_Test.AE_Function() 在 D:\dmoco\work_Project\AE_DVS_HDR\T2001AutoExposureControl\T2001_mass-storage-tool_using_net6\raw-data-mass-storage\AE_mode\AE_DVS_Form_Test.cs 中: 第 256 行在 System.Threading.ThreadHelper.ThreadStart_Context(Object state) 在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) --- 上一位置中堆栈跟踪的末尾 --- 在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) 在 System.Threading.ThreadHelper.ThreadStart()

这是一个线程同步异常。异常信息指出，在类 CMOSImageSensor.T2001 中的 GetSsrMode() 方法的第 433 行和 GetMaxIntegrationVblk() 方法的第 610 行调用了同步对象方法，但这些方法是在未同步的代码块中调用的。...

asm1153e 关闭uasp

依照https://oni-assistant.com/tools/rocketcalculator帮我设计一个界面

Total Mass: [Read-only output box] Delta V: [Read-only output box] Thrust-to-Weight Ratio: [Read-only output box] [Calculate] [Clear] ``` 界面包括两个部分，上半部分是输入火箭参数的区域，下半部分...

编译器:C++ (g++) Particle类型用于表示处于三维空间中的质点，其包括如下成员：① 三个浮点数成员x、y和z表示质点在三维空间中的坐标；② 浮点数成员mass表示质点的质量；③ 接受空间坐标和质量参数的构造函数；④ 自定义operator-()操作符函数用于计算两个质点间的万有引力，即表达式p1 – p2调用执行p1的operator-()操作符函数，计算质点p1和p2间的万有引力。万有引用公式F = GMm/r²中，万有引力常数G = 6.67×10-11N·m²/kg²。请依据上述描述，设计Particle类，使得下述代码能正常执行。注意：天文数字都很大，建议浮点数全部采用long double类型。裁判测试程序样例： #include <iostream> #include <cmath> using namespace std; //在此处定义Particle类及其重载operator+()操作符函数 int main() { long double x, y, z, mass; cin >> x >> y >> z >> mass; Particle p1(x,y,z,mass); cin >> x >> y >> z >> mass; const Particle p2(x,y,z,mass); long double force = p1 - p2; printf("Gravity between two objects = %.1Lf N",force); return 0; } 输入样例： 0 0 0 5.965e15 0 0 38400000 7.342e14 输出样例： Gravity between two objects = 198101.7 N 说明：输入输出中的所有数据均为标准单位，坐标为米，质量为kg。请注意：函数题只需要提交相关代码片段，不要提交完整程序。

class Particle{ private: long double x, y, z, mass; public: Particle(long double x=0, long double y=0, long double z=0, long double mass=0){ this->x = x; this->y = y; this->z = z; this->mass = ...

Define a class that meets the following specifications. Class name: WaterBody Class constructor parameter: 1. int/float Assign this number to the instance attribute volume The class has class attributes RHO = 997 and G = 9.81. Define a class method for the WaterBody class that meets the following specifications. Method name : get_hydrostatic_pressure Method parameter: 1. float Method type: Class method Return value: 1. float Using the input float, the depth. calculate and return the hydrostatic pressure. Hydrostatic pressure a given depth = RHOGdepth If the depth is less than 0, the static method should raise an InvalidDepthError. Define a instance method for the WaterBody class that meets the following specifications. Method name: get_water_mass Method type: Instance method Return value: 1. Float This method should return the mass of the waterbody given that mass = RHO* volume

The class also has two class attributes `RHO` and `G`, which are used in the methods to calculate the hydrostatic pressure and the water mass. The `get_hydrostatic_pressure` method is a class method...

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