1# NFC<a name="EN-US_TOPIC_0000001133207781"></a> 2 3- [Introduction](#section13587125816351) 4- [Architecture](#section13587185873516) 5- [Directory Structure](#section161941989596) 6- [Constraints](#section119744591305) 7- [Usage](#section1312121216216) 8- [Repositories Involved](#section1371113476307) 9 10## Introduction<a name="section13587125816351"></a> 11 12Near-field communication \(NFC\) is a non-contact identification and interconnection technology for short-distance wireless communication between mobile devices, consumer electronic products, PCs, and smart devices. 13 14NFC service provides NFC switch control, NFC tag discovery and dispatch, NFC tag reading and writing, NFC card emulation functions. 15 16## Architecture<a name="section13587185873516"></a> 17 18**Figure 1** NFC architecture<a name="fig4460722185514"></a> 19 20 21 22 23## Directory Structure<a name="section161941989596"></a> 24 25``` 26/foundation/communication/nfc 27├── interfaces # Interface 28│ └── inner_api # System inner interface 29├── frameworks # Framework interface 30│ └── js # Implementation of JS API 31│ └── napi # Napi implementation of JS API 32├── services # Service implementation 33├── test # Test code 34├── BUILD.gn # Build entry 35└── bundle.json # Component description 36``` 37 38## Constraints<a name="section119744591305"></a> 39 40- The device must have an NFC controller chip to use NFC services. 41 42## Usage<a name="section1312121216216"></a> 43 44- NFC switch 45 46Please reference: docs/zh-cn/application-dev/reference/apis/js-apis-nfcController.md。 47 48- NFC tag reading and writing 49 50Please reference: docs/zh-cn/application-dev/reference/apis/js-apis-nfcTag.md。 51 52- NFC card emulation 53 54Please reference: docs/zh-cn/application-dev/reference/apis/js-apis-cardEmulation.md。 55 56## Repositories Involved<a name="section1371113476307"></a> 57 58hmf/communication/nfc 59 60
