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Add an optional byte-oriented write method to the MTD interface

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Gregory Nutt
2013-05-01 10:59:57 -06:00
parent 86f276cb7c
commit bee032fc84
1 changed files with 10 additions and 1 deletions
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Documentation/NuttxPortingGuide.html
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@@ -3192,12 +3192,21 @@ extern void up_ledoff(int led);
</ul> </ul>
<p> <p>
Some devices may support byte oriented reads (optional). Some devices may support byte oriented reads (optional).
Most MTD devices are inherently block oriented so byte-oriented writing is not supported. Most MTD devices are inherently block oriented so byte-oriented accesses are not supported.
It is recommended that low-level drivers not support read() if it requires buffering. It is recommended that low-level drivers not support read() if it requires buffering.
</p> </p>
<ul> <ul>
<p><code>ssize_t (*read)(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, FAR uint8_t *buffer);</code></p> <p><code>ssize_t (*read)(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, FAR uint8_t *buffer);</code></p>
</ul> </ul>
<p>
Some devices may also support byte oriented writes (optional).
Most MTD devices are inherently block oriented so byte-oriented accesses are not supported.
It is recommended that low-level drivers not support read() if it requires buffering.
This interface is only available if <code>CONFIG_MTD_BYTE_WRITE</code> is defined.
</p>
<ul>
<p><code>ssize_t (*write)(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, FAR const uint8_t *buffer);</code></p>
</ul>
<p> <p>
Support other, less frequently used commands: Support other, less frequently used commands:
</p> </p>