版本 1a65c2acc63ed4999216bab0c1bb31c25dc13189
Changes from 1a65c2acc63ed4999216bab0c1bb31c25dc13189 to 90e8d9fd993a5f54f8f7e17dd6defedfe197db3f
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title: Secure digital input/output interface (SDIO)
categories: SDIO, STM32F4
...
Introduction
============
What is SDIO?
-----------------
- A SDIO (Secure Digital Input Output) card is an extension of the SD specification to cover I/O functions.
- Host devices that support SDIO can use the SD slot to support:
1. GPS receivers.
2. digital cameras.
3. RFID readers.
4. FM radio tuners.
5. TV tuners.
6. Wi-Fi.
7. Bluetooth.
Many other SDIO devices have been proposed, but it is now more common for I/O devices to connect using the USB interface.
- SDIO cards support most of the memory commands of SD cards. SDIO cards can be structured as 8 logical cards, although currently, the typical way that an SDIO card uses this capability is to structure itself as one I/O card and one memory card.
.. image:: /sdio1.png
.. image:: /sdio2.png
Difference of SD/MMC/SDIO
--------------------------
Speed class rating
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Reference
==========
- `Secure Digital wiki<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>`_
- `SDIO接口介绍<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>`_
- `Linux（open source）的 SD/MMC/SDIO 支援現況概要<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>`_
- `SD/MMC/SDIO概念區分<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>`_
- `STM32 控制 SD 卡<http://www.360doc.com/content/12/0411/15/9707346_202767012.shtml>`_
- `STM32 + SDIO + FATFS 文件系统 直讀 SD 卡<http://ntn314.blog.163.com/blog/static/16174358420112263456948/>`_
- `零死角玩轉 stm32 - 高級篇之 SDIO（4bit + DMA、支持SDHC、帶協議分析）<http://www.eeboard.com/tutorials/%E9%9B%B6%E6%AD%BB%E8%A7%92%E7%8E%A9%E8%BD%ACstm32-%E9%AB%98%E7%BA%A7%E7%AF%87%E4%B9%8Bsdio%EF%BC%884bit-dma%E3%80%81%E6%94%AF%E6%8C%81sdhc%E3%80%81%E5%B8%A6%E5%8D%8F%E8%AE%AE%E5%88%86%E6%9E%90/>`_
