group__sd__raw.html

MMC/SD操作

          <td class="mdname" nowrap> <em>length</em></td>
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<p>
Reads raw data from the card. 
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>offset</em>&nbsp;</td><td>The offset from which to read. </td></tr>
    <tr><td valign="top"><tt>[out]</tt>&nbsp;</td><td valign="top"><em>buffer</em>&nbsp;</td><td>The buffer into which to write the data. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>length</em>&nbsp;</td><td>The number of bytes to read. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on failure, 1 on success. </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__sd__raw.html#gbf550aa783830a0b77bd3e753dc4405c">sd_raw_read_interval</a>, <a class="el" href="group__sd__raw.html#g51fc917873e34e96cb981fbbb47a69c5">sd_raw_write</a> </dd></dl>
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<a class="anchor" name="gbf550aa783830a0b77bd3e753dc4405c"></a><!-- doxytag: member="sd_raw.c::sd_raw_read_interval" ref="gbf550aa783830a0b77bd3e753dc4405c" args="(uint32_t offset, uint8_t *buffer, uint16_t interval, uint16_t length, sd_raw_interval_handler callback, void *p)" --><p>
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          <td class="md" nowrap valign="top">uint8_t sd_raw_read_interval           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">uint32_t&nbsp;</td>
          <td class="mdname" nowrap> <em>offset</em>, </td>
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          <td class="md" nowrap>uint8_t *&nbsp;</td>
          <td class="mdname" nowrap> <em>buffer</em>, </td>
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          <td class="md" nowrap>uint16_t&nbsp;</td>
          <td class="mdname" nowrap> <em>interval</em>, </td>
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          <td class="md" nowrap>uint16_t&nbsp;</td>
          <td class="mdname" nowrap> <em>length</em>, </td>
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          <td class="md" nowrap>sd_raw_interval_handler&nbsp;</td>
          <td class="mdname" nowrap> <em>callback</em>, </td>
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          <td class="md" nowrap>void *&nbsp;</td>
          <td class="mdname" nowrap> <em>p</em></td>
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<p>
Continuously reads units of <code>interval</code> bytes and calls a callback function. 
<p>
This function starts reading at the specified offset. Every <code>interval</code> bytes, it calls the callback function with the associated data buffer.<p>
By returning zero, the callback may stop reading.<p>
<dl compact><dt><b>Note:</b></dt><dd>Within the callback function, you can not start another read or write operation. <p>
This function only works if the following conditions are met:<ul>
<li>(offset - (offset % 512)) % interval == 0</li><li>length % interval == 0</li></ul>
</dd></dl>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>offset</em>&nbsp;</td><td>Offset from which to start reading. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>buffer</em>&nbsp;</td><td>Pointer to a buffer which is at least interval bytes in size. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>interval</em>&nbsp;</td><td>Number of bytes to read before calling the callback function. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>length</em>&nbsp;</td><td>Number of bytes to read altogether. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>callback</em>&nbsp;</td><td>The function to call every interval bytes. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>p</em>&nbsp;</td><td>An opaque pointer directly passed to the callback function. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on failure, 1 on success </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__sd__raw.html#g5f69513fd8228ea269a61f1dff737129">sd_raw_read</a>, <a class="el" href="group__sd__raw.html#g51fc917873e34e96cb981fbbb47a69c5">sd_raw_write</a> </dd></dl>
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<a class="anchor" name="g51fc917873e34e96cb981fbbb47a69c5"></a><!-- doxytag: member="sd_raw.c::sd_raw_write" ref="g51fc917873e34e96cb981fbbb47a69c5" args="(uint32_t offset, const uint8_t *buffer, uint16_t length)" --><p>
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          <td class="md" nowrap valign="top">uint8_t sd_raw_write           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">uint32_t&nbsp;</td>
          <td class="mdname" nowrap> <em>offset</em>, </td>
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          <td class="md" nowrap>const uint8_t *&nbsp;</td>
          <td class="mdname" nowrap> <em>buffer</em>, </td>
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          <td class="md" nowrap>uint16_t&nbsp;</td>
          <td class="mdname" nowrap> <em>length</em></td>
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<p>
Writes raw data to the card. 
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>offset</em>&nbsp;</td><td>The offset where to start writing. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>buffer</em>&nbsp;</td><td>The buffer containing the data to be written. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>length</em>&nbsp;</td><td>The number of bytes to write. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on failure, 1 on success. </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__sd__raw.html#g5f69513fd8228ea269a61f1dff737129">sd_raw_read</a> </dd></dl>
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<hr size="1"><address style="align: right;"><small>Generated on Thu Mar 16 13:43:58 2006 for sd-reader by&nbsp;
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