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<a href="#func-members">Functions</a> </div>
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<div class="title">Data Counter functions<div class="ingroups"><a class="el" href="group___s_t_m32_f4xx___std_periph___driver.html">STM32F4xx_StdPeriph_Driver</a> » <a class="el" href="group___d_m_a.html">DMA</a> » <a class="el" href="group___d_m_a___private___functions.html">DMA_Private_Functions</a></div></div> </div>
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<p>Data Counter functions.
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<a href="#details">More...</a></p>
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Collaboration diagram for Data Counter functions:</div>
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<div class="dyncontent">
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<center><table><tr><td><img src="group___d_m_a___group2.png" border="0" alt="" usemap="#group______d__m__a______group2"/>
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<map name="group______d__m__a______group2" id="group______d__m__a______group2">
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<area shape="rect" id="node2" href="group___d_m_a___private___functions.html" title="DMA_Private_Functions" alt="" coords="5,5,167,32"/></map>
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</td></tr></table></center>
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</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga6a11a2c951cff59b125ba8857d44e3f3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___d_m_a___group2.html#ga6a11a2c951cff59b125ba8857d44e3f3">DMA_SetCurrDataCounter</a> (<a class="el" href="struct_d_m_a___stream___type_def.html">DMA_Stream_TypeDef</a> *DMAy_Streamx, uint16_t Counter)</td></tr>
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<tr class="memdesc:ga6a11a2c951cff59b125ba8857d44e3f3"><td class="mdescLeft"> </td><td class="mdescRight">Writes the number of data units to be transferred on the DMAy Streamx. <a href="#ga6a11a2c951cff59b125ba8857d44e3f3">More...</a><br /></td></tr>
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<tr class="separator:ga6a11a2c951cff59b125ba8857d44e3f3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga4a76444a92423f5f15a4328738d6dc46"><td class="memItemLeft" align="right" valign="top">uint16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___d_m_a___group2.html#ga4a76444a92423f5f15a4328738d6dc46">DMA_GetCurrDataCounter</a> (<a class="el" href="struct_d_m_a___stream___type_def.html">DMA_Stream_TypeDef</a> *DMAy_Streamx)</td></tr>
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<tr class="memdesc:ga4a76444a92423f5f15a4328738d6dc46"><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of remaining data units in the current DMAy Streamx transfer. <a href="#ga4a76444a92423f5f15a4328738d6dc46">More...</a><br /></td></tr>
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<tr class="separator:ga4a76444a92423f5f15a4328738d6dc46"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p>Data Counter functions. </p>
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<pre class="fragment"> ===============================================================================
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##### Data Counter functions #####
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===============================================================================
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[..]
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This subsection provides function allowing to configure and read the buffer size
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(number of data to be transferred).
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[..]
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The DMA data counter can be written only when the DMA Stream is disabled
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(ie. after transfer complete event).
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[..]
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The following function can be used to write the Stream data counter value:
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(+) void DMA_SetCurrDataCounter(DMA_Stream_TypeDef* DMAy_Streamx, uint16_t Counter);
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-@- It is advised to use this function rather than DMA_Init() in situations
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where only the Data buffer needs to be reloaded.
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-@- If the Source and Destination Data Sizes are different, then the value
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written in data counter, expressing the number of transfers, is relative
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to the number of transfers from the Peripheral point of view.
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ie. If Memory data size is Word, Peripheral data size is Half-Words,
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then the value to be configured in the data counter is the number
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of Half-Words to be transferred from/to the peripheral.
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[..]
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The DMA data counter can be read to indicate the number of remaining transfers for
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the relative DMA Stream. This counter is decremented at the end of each data
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transfer and when the transfer is complete:
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(+) If Normal mode is selected: the counter is set to 0.
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(+) If Circular mode is selected: the counter is reloaded with the initial value
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(configured before enabling the DMA Stream)
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[..]
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The following function can be used to read the Stream data counter value:
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(+) uint16_t DMA_GetCurrDataCounter(DMA_Stream_TypeDef* DMAy_Streamx);</pre> <h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="ga4a76444a92423f5f15a4328738d6dc46"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">uint16_t DMA_GetCurrDataCounter </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_d_m_a___stream___type_def.html">DMA_Stream_TypeDef</a> * </td>
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<td class="paramname"><em>DMAy_Streamx</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Returns the number of remaining data units in the current DMAy Streamx transfer. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">DMAy_Streamx</td><td>where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="retval"><dt>Return values</dt><dd>
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<table class="retval">
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<tr><td class="paramname">The</td><td>number of remaining data units in the current DMAy Streamx transfer. </td></tr>
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</table>
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</dd>
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</dl>
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</div>
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</div>
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<a class="anchor" id="ga6a11a2c951cff59b125ba8857d44e3f3"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void DMA_SetCurrDataCounter </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_d_m_a___stream___type_def.html">DMA_Stream_TypeDef</a> * </td>
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<td class="paramname"><em>DMAy_Streamx</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint16_t </td>
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<td class="paramname"><em>Counter</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Writes the number of data units to be transferred on the DMAy Streamx. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">DMAy_Streamx</td><td>where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream. </td></tr>
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<tr><td class="paramname">Counter</td><td>Number of data units to be transferred (from 0 to 65535) Number of data items depends only on the Peripheral data format.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section note"><dt>Note</dt><dd>If Peripheral data format is Bytes: number of data units is equal to total number of bytes to be transferred.</dd>
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<dd>
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If Peripheral data format is Half-Word: number of data units is equal to total number of bytes to be transferred / 2.</dd>
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<dd>
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If Peripheral data format is Word: number of data units is equal to total number of bytes to be transferred / 4.</dd>
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<dd>
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In Memory-to-Memory transfer mode, the memory buffer pointed by DMAy_SxPAR register is considered as Peripheral.</dd></dl>
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<dl class="retval"><dt>Return values</dt><dd>
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<table class="retval">
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<tr><td class="paramname">The</td><td>number of remaining data units in the current DMAy Streamx transfer. </td></tr>
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</table>
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</dd>
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</dl>
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