| 基于I2C总线的I／O口扩展设计 |
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| 引用本文： | 叶扬科,钱剑敏,成高.基于I2C总线的I／O口扩展设计[J].现代电子技术,2012,35(12):59-62. |
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| 作者姓名： | 叶扬科 钱剑敏 成高 |
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| 作者单位： | 1. 东华大学 信息科学与技术学院,上海,201620
2. 上海华东汽车信息技术有限公司,上海,201620 |
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| 摘 要： | 由于传统的NI—DIO驱动板卡能够驱动的I／O口数量比较有限，一般只应用在测试通道数比较少的实验场合。而在一般的大型环境试验中，要求能对多个产品同时测量。如果使用传统的DIO板卡测试，就会出现测量通道数量不够的情况。针对此类问题，提出了运用单片机与I／O扩展芯片PCA9554／A采用I2C通信进行I／0扩展，上位机采用LabVIEW编程，界面友好、操作方便，在环境实验中起到了良好效果。
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| 关 键 词： | I／O口 MCU PCA9554／A LabVIEW |
Design of I/O port expansion based on I~2C bus |
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| YE Yang-ke
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QIAN Jian-min
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CHENG Gao.Design of I/O port expansion based on I~2C bus[J].Modern Electronic Technique,2012,35(12):59-62. |
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| Authors: | YE Yang-ke QIAN Jian-min CHENG Gao |
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| Affiliation: | 1.College of Information Science and Technology,Donhua University,Shanghai 201620,China;2.CETC-MOTOR,Shanghai 201620,China) |
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| Abstract: | Since the traditional NI-DIO driver board can only drive limited number of I/O ports,it is always used in the test occasions,in which there are few testing channels under test.But in general large test,many products need to be measured in the same time.If the traditional NI-DIO driver board is used for testing,the number of test channels will be not enough.In the light of this,a way of I/O expansion is proposed,in which I2C bus communication between MCU and I/O extension chip PCA9554/A is used.The LabVIEW is used for programming on the PC.It has friendly interface and easy operation.A good result was achieved in environment test. |
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| Keywords: | I/O port MCU PCA9554/A LabVIEW |
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