描述

技術(shù)發(fā)展到今天的信息時(shí)代，數(shù)據(jù)的存儲(chǔ)和傳輸在嵌入式系統(tǒng)有了越來(lái)越重要的地位。而USB是目前設(shè)計(jì)成熟、應(yīng)用廣泛且使用極為簡(jiǎn)捷的技術(shù)，USB傳輸是一種高效方便的數(shù)據(jù)傳輸方式?；谏鲜鲈?，本文重點(diǎn)論述基于USB的海量存儲(chǔ)(USBMassStorage)設(shè)備功能在ARM嵌入式系統(tǒng)中設(shè)計(jì)和應(yīng)用。使用該設(shè)備功能，上位機(jī)可以像讀寫(xiě)普通U盤(pán)一樣對(duì)于系統(tǒng)采集并存儲(chǔ)在FLASH中的數(shù)據(jù)進(jìn)行讀寫(xiě)。

1硬件方案

l.1器件簡(jiǎn)介

S3C44B0X[1]是SAMSUNG公司出品的基于ARM7TDMI內(nèi)核的RISC型微處理器，8kB指令和數(shù)據(jù)共享的緩存，主頻可達(dá)66MHz，可以運(yùn)行16位的Thumb指令和32位的ARM指令，且接口豐富，具有通用性。

&nbs

p;K9F2808U0C[2]是SAMSUNG公司生產(chǎn)的一款Nand型閃存芯片，容量為16MB，讀寫(xiě)速度快，數(shù)據(jù)保存時(shí)間長(zhǎng)，可擦寫(xiě)10萬(wàn)次，在嵌入式系統(tǒng)中有著廣泛的應(yīng)用，主要是負(fù)責(zé)數(shù)據(jù)存儲(chǔ)。

PDIUSBDl2[3]是PHILIPS公司生產(chǎn)的帶有并行總線和局部DMA傳輸能力的全速USB接口芯片，符合USB1.1版規(guī)范，可以與任何外部MCU／MPU實(shí)現(xiàn)并行接口，傳輸速度可達(dá)2MB／s。該USB芯片有1個(gè)控制端點(diǎn)和2個(gè)普通端點(diǎn)。

1.2硬件連接圖

硬件連接如圖1所示。在該系統(tǒng)中，F(xiàn)LASH芯片K9F2808U0C負(fù)責(zé)嵌入式系統(tǒng)中的數(shù)據(jù)存儲(chǔ)；處理器S3C44B0X執(zhí)行底層固件代碼；USB接口芯片PDIUS-BDl2負(fù)責(zé)

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

CONVUM VACUUM GENERATOR,TYPE CV-20LSCK

Convum MPS-V2R-G Vacuum Sensor

PARKER/CONVUM VACUUM AIR GENERATOR CV-30AHSN

Lot/4 Convum PS-50-F Vacuum Suction Pads

1 NIB CONVUM MPS-V3RC-GHA VACUUM SENSOR MPSV3RCGHA

PARKER CONVUM VACUUM SOLENOID VALVE MC2S10HSZM24B5N

Convum Vacuum Solenoid CVA-15HS

CKD CONVUM 3/8″PORT VACUUM FILTERS VF-6

CKD CONVUM 1/4″PORT VACUUM FILTERS VF-5

Convum PF-50 Vacuum Suction Pad

CONVUM VF-5 VACCUM GENERATOR FILTER CV-15,MCA-10/13

CONVUM FILTER VF-5 MYOTOHU COMPRESSOR FILTER 1/4 NPT

Parker Convum TYS-20B-30 Bulkhead Level Compensator

Myotohu Convum CVA-15QS Vacuum Actuator

CONVUM CVK-15HRZD PRESSURE SOLENOID VALVE CONVUM

Parker Convum CV-25HSN

CONVUM CVA-15HS35GDN NSFP CVA15HS35GDN

CONVUM MYOTOHU CVT05HS

PARKER CONVUM VACUUM SOLENOID VALVE MC2S07HSZM24B5N

CONVUM CV-15HS NSFP CV15HS

Convum Pneumatic Valve Manifold CVK-15HRZD Lot of 2

CONVUM CVA-15OS USPP CVA15OS

CONVUM CVA-15QS USPP CVA15QS

DNS CONVUM SENSOR,DIGITAL 2-AE-J0043 D4M5-GHA-D4

CONVUM CV-10HSCK NSFP CV10HSCK

CONVUM VF-3 VACUUM FILTER 1/8″

Convum APS030-PNP-SA2 Vacuum Sensor

CONVUM VACUUM FILTERS VF-6

CONVUM CV-10LS USPP CV10LS

Convum Manifold Solenoid Valve CVK-15HRZD 24V MVS SMC

CONVUM CVA-10LSB NSPP CVA10LSB

PARKER CONVUM PF-120D VACUUM CUP PAD

PARKER CV15HSN CONVUM VALVE CV-15HSN 1/4 INCH 1/4″

Convum Myotoku CVK-15HRZD 24BD Pneumatic Solenoid(794)

CONVUM PRESSURE DISPLAY SWITCH MPS-71E-G-D5

Convum Parker PFYK-25-U Vacuum Suction Cups

MYOTOKY LDT.CVA-15HSA CONVUM VALVE

Parker Convum CEK27HSZC24PBLN Vacuum Pump Generator

Convum Vacuum Generator Pump CV10HSC

Convum Vacuum Generator Pump CCV10HSCK NEW

2 Convum Parker PFYK-25-SI Vacuum Suction Cups

PARKER generator CONVUM VACUUM PUMP PA244-RV3.5

MYOTOKU/CONVUM CV-10LS GENERATOR 10MM LOW VACUUM

MYOTOKU/CONVUM CV-10LS GENERATOR 10MM LOW VACUUM

CONVUM MVS-030-W NSFP MVS030W

CONVUM SENSOR,VACUUM FOR SPIN SD MPS-R3S5-GHA-D

DNS CONVUM?SENSOR,PRESSURE 2-AE-J0076 P3M5-GHA-D

CONVUM CVK-20HSABC-24B?L USPP CVK20HSABC24BL

DNS CONVUM SENSOR,DIGITAL SPI 2-AE-J0012 R3S5-GHA-D

Myotohu Convum MVS-030 Vacuum Switch

MYOTOKU/CONVUM CVF-1-10LS GENERATOR 1MM

CONVUM MPS-V2R-C NSFP MPSV2RC

CONVUM MPS-P1N-PC NSFP MPSP1NPC

DNS CONVUM PRESSURE SENSOR ASSY 2-AE-J0067 R3S5-GHA-D

CONVUM CYLINDER TKY-0-4.5X3

Convum Vacuum Switch CVA-D,CVA-10,CVA-V3B

Myotoky LTD.Model:CVA-10HR-VDN-24?B Convum Valve

4-Convum Vacuum Technology Valves CVK-15HSZC 24 VDC

MYOTOKU/CONVUM CVF-1-10HRAB/MV?S-030-AB VAC SENSOR

MYOTOKU CONVUM CVR Vacuum Switch

CONVUM CVF-2-05HS VACUUM SWITCH SOLENOID VALVE

CONVUM MPS-V2R-PGA NSPP MPSV2RPGA

Parker MPS Convum PRESSURE Switch P6N-PG(11)

Parker Convum CVX-0260-B-E0S-?DN PA244-RV3.5 Vacuum Pump

MYOTOKU/CONVUM VF-3 VACUUM FILTER

CONVUM MPS-V3RC-G-M VACUUM PRESSURE SENSOR

Parker Convum Vacuum LED Switch MPS-V2N-PC

Parker Convum CVX0260BE0SDNNA Vacume Pump PA244-RV3.5

Parker Convum MPS-R3F5-NC Stainless Pressure Sensor New

Convum CVA-DN/CVA-15HS 24BL/C-0054-CVA

Myotoku Convum F-1 Vacuum Ejector C-21-316

Convum VF-3

Convum CVA-15HR-B Vacuum Release Solenoid Valve NNB

CONVUM A QUICK RELEASE VALVE CVA-D NO.EKT(15-19)

Convum MPS-V9M-NG-YOK Sensor

Convum MC2S07HS-ZM24B5?R-8Y19 Valve w/A00SC23-Z06-028

Convum MVS-030-AB Vacuum Sensor NPN MVS030AB NIB

Parker Convum MVS-030ABP PNP Sensor MVS030ABP NIB

Convum VF-6 Pneumatic Port Vacuum Filter NIB

Convum VF-3 vacuum filter assembly 1/8″w/element