mayhem-firmware/firmware/chibios-portapack/ext/fatfs/doc/en/dread.html

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<title>FatFs - disk_read</title>
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<div class="para func">
<h2>disk_read</h2>
<p>The disk_read function is called to read data from the sector(s) of storage device.</p>
<pre>
DRESULT disk_read (
  BYTE <span class="arg">pdrv</span>,     <span class="c">/* [IN] Physical drive number */</span>
  BYTE* <span class="arg">buff</span>,    <span class="c">/* [OUT] Pointer to the read data buffer */</span>
  DWORD <span class="arg">sector</span>,  <span class="c">/* [IN] Start sector number */</span>
  UINT <span class="arg">count</span>     <span class="c">/* [IN] Number of sectros to read */</span>
);
</pre>
</div>

<div class="para arg">
<h4>Parameters</h4>
<dl class="par">
<dt>pdrv</dt>
<dd>Physical drive number to identify the target device.</dd>
<dt>buff</dt>
<dd>Pointer to the first item of the <em>byte array</em> to store read data.</dd>
<dt>sector</dt>
<dd>Start sector number in 32-bit LBA.</dd>
<dt>count</dt>
<dd>Number of sectors to read.</dd>
</dl>
</div>


<div class="para ret">
<h4>Return Value</h4>
<dl class="ret">
<dt>RES_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>RES_ERROR</dt>
<dd>A hard error occured during the read operation and could not recover it.</dd>
<dt>RES_PARERR</dt>
<dd>Invalid parameter.</dd>
<dt>RES_NOTRDY</dt>
<dd>The device has not been initialized.</dd>
</dl>
</div>


<div class="para desc">
<h4>Description</h4>
<p>The data read/write operation to the storage devices is done in unit of <em>sector</em>. FatFs supports the sector size in range of from 512 to 4096 bytes. When FatFs is configured to fixed sector size (<tt>_MIN_SS == MAX_SS</tt>, this will be the most case), the read/write function must work at that sector size. When FatFs is configured to variable sector size (<tt>_MIN_SS != MAX_SS</tt>), sector size is inquired with <tt>disk_ioctl</tt> function following <tt>disk_initialize</tt> function.</p>
<p>The memory address specified by <tt class="arg">buff</tt> is not that always aligned to word boundary because the argument is defined as <tt>BYTE*</tt>. The unaligned read/write request can occure at <a href="appnote.html#fs1">direct transfer</a>. If the bus architecture, especially DMA controller, does not allow unaligned memory access, it should be solved in this function. There are some workarounds described below to avoid this issue.</p>
<ul>
<li>Convert word transfer to byte transfer in this function if needed. - Recommended.</li>
<li>On the <tt>f_read()</tt> calls, avoid long read request that includes a whole of sector. - Any direct transfer never occures.</li>
<li>On the <tt>f_read(fp, data, btw, bw)</tt> calls, make sure that <tt>(((UINT)data &amp; 3) == (f_tell(fp) &amp; 3))</tt> is true. - Word alignment of <tt class="arg">buff</tt> is guaranteed.</li>
</ul>
<p>Generally, a multiple sector transfer request must not be split into single sector transactions to the storage device, or you will not get good read throughput.</p>
</div>


<p class="foot"><a href="../00index_e.html">Return</a></p>
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Initial firmware commit. 2015-07-08 15:39:24 +00:00			`<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">`
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			`<link rel="up" title="FatFs" href="../00index_e.html">`
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			`<title>FatFs - disk_read</title>`
			`</head>`

			`<body>`

			`<div class="para func">`
			`<h2>disk_read</h2>`
FatFs: Update to release R0.12b. 2017-05-03 11:35:19 +00:00			`<p>The disk_read function is called to read data from the sector(s) of storage device.</p>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`<pre>`
			`DRESULT disk_read (`
			`BYTE <span class="arg">pdrv</span>, <span class="c">/* [IN] Physical drive number */</span>`
			`BYTE* <span class="arg">buff</span>, <span class="c">/* [OUT] Pointer to the read data buffer */</span>`
			`DWORD <span class="arg">sector</span>, <span class="c">/* [IN] Start sector number */</span>`
			`UINT <span class="arg">count</span> <span class="c">/* [IN] Number of sectros to read */</span>`
			`);`
			`</pre>`
			`</div>`

			`<div class="para arg">`
			`<h4>Parameters</h4>`
			`<dl class="par">`
			`<dt>pdrv</dt>`
			`<dd>Physical drive number to identify the target device.</dd>`
			`<dt>buff</dt>`
FatFs: Update to release R0.12b. 2017-05-03 11:35:19 +00:00			`<dd>Pointer to the first item of the <em>byte array</em> to store read data.</dd>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`<dt>sector</dt>`
			`<dd>Start sector number in 32-bit LBA.</dd>`
			`<dt>count</dt>`
FatFs: Update to R0.12a. 2016-07-29 06:06:21 +00:00			`<dd>Number of sectors to read.</dd>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`</dl>`
			`</div>`


			`<div class="para ret">`
			`<h4>Return Value</h4>`
			`<dl class="ret">`
			`<dt>RES_OK (0)</dt>`
			`<dd>The function succeeded.</dd>`
			`<dt>RES_ERROR</dt>`
FatFs: Update to release R0.12b. 2017-05-03 11:35:19 +00:00			`<dd>A hard error occured during the read operation and could not recover it.</dd>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`<dt>RES_PARERR</dt>`
			`<dd>Invalid parameter.</dd>`
			`<dt>RES_NOTRDY</dt>`
			`<dd>The device has not been initialized.</dd>`
			`</dl>`
			`</div>`


			`<div class="para desc">`
			`<h4>Description</h4>`
FatFs: Update to R0.12a. 2016-07-29 06:06:21 +00:00			<p>The data read/write operation to the storage devices is done in unit of <em>sector</em>. FatFs supports the sector size in range of from 512 to 4096 bytes. When FatFs is configured to fixed sector size (<tt>_MIN_SS == MAX_SS</tt>, this will be the most case), the read/write function must work at that sector size. When FatFs is configured to variable sector size (<tt>_MIN_SS != MAX_SS</tt>), sector size is inquired with <tt>disk_ioctl</tt> function following <tt>disk_initialize</tt> function.</p>
			`<p>The memory address specified by <tt class="arg">buff</tt> is not that always aligned to word boundary because the argument is defined as <tt>BYTE*</tt>. The unaligned read/write request can occure at <a href="appnote.html#fs1">direct transfer</a>. If the bus architecture, especially DMA controller, does not allow unaligned memory access, it should be solved in this function. There are some workarounds described below to avoid this issue.</p>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`<ul>`
			`<li>Convert word transfer to byte transfer in this function if needed. - Recommended.</li>`
FatFs: Update to release R0.12c. 2017-05-03 11:39:05 +00:00			`<li>On the <tt>f_read()</tt> calls, avoid long read request that includes a whole of sector. - Any direct transfer never occures.</li>`
			`<li>On the <tt>f_read(fp, data, btw, bw)</tt> calls, make sure that <tt>(((UINT)data & 3) == (f_tell(fp) & 3))</tt> is true. - Word alignment of <tt class="arg">buff</tt> is guaranteed.</li>`
Initial firmware commit. 2015-07-08 15:39:24 +00:00			`</ul>`
			`<p>Generally, a multiple sector transfer request must not be split into single sector transactions to the storage device, or you will not get good read throughput.</p>`
			`</div>`


			`<p class="foot"><a href="../00index_e.html">Return</a></p>`
			`</body>`
			`</html>`