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479 lines
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<a href="#func-members">Functions</a> </div>
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<div class="title">Interrupts and flags management 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___u_s_a_r_t.html">USART</a> » <a class="el" href="group___u_s_a_r_t___private___functions.html">USART_Private_Functions</a></div></div> </div>
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<div class="contents">
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<p>Interrupts and flags management functions.
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<a href="#details">More...</a></p>
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Collaboration diagram for Interrupts and flags management functions:</div>
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<center><table><tr><td><img src="group___u_s_a_r_t___group9.png" border="0" alt="" usemap="#group______u__s__a__r__t______group9"/>
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<map name="group______u__s__a__r__t______group9" id="group______u__s__a__r__t______group9">
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<area shape="rect" id="node2" href="group___u_s_a_r_t___private___functions.html" title="USART_Private_Functions" alt="" coords="5,13,180,39"/></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:ga6d8f2dd1f34060ae7e386e3e5d56b6f6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___u_s_a_r_t___group9.html#ga6d8f2dd1f34060ae7e386e3e5d56b6f6">USART_ITConfig</a> (<a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> *USARTx, uint16_t USART_IT, FunctionalState NewState)</td></tr>
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<tr class="memdesc:ga6d8f2dd1f34060ae7e386e3e5d56b6f6"><td class="mdescLeft"> </td><td class="mdescRight">Enables or disables the specified USART interrupts. <a href="#ga6d8f2dd1f34060ae7e386e3e5d56b6f6">More...</a><br /></td></tr>
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<tr class="separator:ga6d8f2dd1f34060ae7e386e3e5d56b6f6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga144630722defc9e312f0ad280b68e9da"><td class="memItemLeft" align="right" valign="top">FlagStatus </td><td class="memItemRight" valign="bottom"><a class="el" href="group___u_s_a_r_t___group9.html#ga144630722defc9e312f0ad280b68e9da">USART_GetFlagStatus</a> (<a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> *USARTx, uint16_t USART_FLAG)</td></tr>
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<tr class="memdesc:ga144630722defc9e312f0ad280b68e9da"><td class="mdescLeft"> </td><td class="mdescRight">Checks whether the specified USART flag is set or not. <a href="#ga144630722defc9e312f0ad280b68e9da">More...</a><br /></td></tr>
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<tr class="separator:ga144630722defc9e312f0ad280b68e9da"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gad962e148fc466ae1b45b288f6c91d966"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___u_s_a_r_t___group9.html#gad962e148fc466ae1b45b288f6c91d966">USART_ClearFlag</a> (<a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> *USARTx, uint16_t USART_FLAG)</td></tr>
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<tr class="memdesc:gad962e148fc466ae1b45b288f6c91d966"><td class="mdescLeft"> </td><td class="mdescRight">Clears the USARTx's pending flags. <a href="#gad962e148fc466ae1b45b288f6c91d966">More...</a><br /></td></tr>
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<tr class="separator:gad962e148fc466ae1b45b288f6c91d966"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga93d8f031241bcdbe938d091a85295445"><td class="memItemLeft" align="right" valign="top">ITStatus </td><td class="memItemRight" valign="bottom"><a class="el" href="group___u_s_a_r_t___group9.html#ga93d8f031241bcdbe938d091a85295445">USART_GetITStatus</a> (<a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> *USARTx, uint16_t USART_IT)</td></tr>
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<tr class="memdesc:ga93d8f031241bcdbe938d091a85295445"><td class="mdescLeft"> </td><td class="mdescRight">Checks whether the specified USART interrupt has occurred or not. <a href="#ga93d8f031241bcdbe938d091a85295445">More...</a><br /></td></tr>
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<tr class="separator:ga93d8f031241bcdbe938d091a85295445"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga1fc25d0338695063be5e50156955d9bc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___u_s_a_r_t___group9.html#ga1fc25d0338695063be5e50156955d9bc">USART_ClearITPendingBit</a> (<a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> *USARTx, uint16_t USART_IT)</td></tr>
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<tr class="memdesc:ga1fc25d0338695063be5e50156955d9bc"><td class="mdescLeft"> </td><td class="mdescRight">Clears the USARTx's interrupt pending bits. <a href="#ga1fc25d0338695063be5e50156955d9bc">More...</a><br /></td></tr>
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<tr class="separator:ga1fc25d0338695063be5e50156955d9bc"><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>Interrupts and flags management functions. </p>
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<pre class="fragment"> ===============================================================================
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##### Interrupts and flags management functions #####
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===============================================================================
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[..]
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This subsection provides a set of functions allowing to configure the USART
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Interrupts sources, DMA channels requests and check or clear the flags or
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pending bits status.
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The user should identify which mode will be used in his application to manage
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the communication: Polling mode, Interrupt mode or DMA mode.
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*** Polling Mode ***
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====================
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[..]
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In Polling Mode, the SPI communication can be managed by 10 flags:
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(#) USART_FLAG_TXE : to indicate the status of the transmit buffer register
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(#) USART_FLAG_RXNE : to indicate the status of the receive buffer register
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(#) USART_FLAG_TC : to indicate the status of the transmit operation
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(#) USART_FLAG_IDLE : to indicate the status of the Idle Line
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(#) USART_FLAG_CTS : to indicate the status of the nCTS input
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(#) USART_FLAG_LBD : to indicate the status of the LIN break detection
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(#) USART_FLAG_NE : to indicate if a noise error occur
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(#) USART_FLAG_FE : to indicate if a frame error occur
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(#) USART_FLAG_PE : to indicate if a parity error occur
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(#) USART_FLAG_ORE : to indicate if an Overrun error occur
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[..]
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In this Mode it is advised to use the following functions:
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(+) FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
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(+) void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
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*** Interrupt Mode ***
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======================
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[..]
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In Interrupt Mode, the USART communication can be managed by 8 interrupt sources
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and 10 pending bits:
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(#) Pending Bits:
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(##) USART_IT_TXE : to indicate the status of the transmit buffer register
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(##) USART_IT_RXNE : to indicate the status of the receive buffer register
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(##) USART_IT_TC : to indicate the status of the transmit operation
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(##) USART_IT_IDLE : to indicate the status of the Idle Line
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(##) USART_IT_CTS : to indicate the status of the nCTS input
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(##) USART_IT_LBD : to indicate the status of the LIN break detection
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(##) USART_IT_NE : to indicate if a noise error occur
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(##) USART_IT_FE : to indicate if a frame error occur
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(##) USART_IT_PE : to indicate if a parity error occur
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(##) USART_IT_ORE : to indicate if an Overrun error occur
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(#) Interrupt Source:
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(##) USART_IT_TXE : specifies the interrupt source for the Tx buffer empty
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interrupt.
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(##) USART_IT_RXNE : specifies the interrupt source for the Rx buffer not
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empty interrupt.
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(##) USART_IT_TC : specifies the interrupt source for the Transmit complete
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interrupt.
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(##) USART_IT_IDLE : specifies the interrupt source for the Idle Line interrupt.
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(##) USART_IT_CTS : specifies the interrupt source for the CTS interrupt.
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(##) USART_IT_LBD : specifies the interrupt source for the LIN break detection
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interrupt.
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(##) USART_IT_PE : specifies the interrupt source for the parity error interrupt.
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(##) USART_IT_ERR : specifies the interrupt source for the errors interrupt.
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-@@- Some parameters are coded in order to use them as interrupt source
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or as pending bits.
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[..]
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In this Mode it is advised to use the following functions:
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(+) void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
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(+) ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
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(+) void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);
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*** DMA Mode ***
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================
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[..]
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In DMA Mode, the USART communication can be managed by 2 DMA Channel requests:
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(#) USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request
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(#) USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request
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[..]
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In this Mode it is advised to use the following function:
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(+) void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);</pre> <h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="gad962e148fc466ae1b45b288f6c91d966"></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 USART_ClearFlag </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> * </td>
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<td class="paramname"><em>USARTx</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>USART_FLAG</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>Clears the USARTx's pending flags. </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">USARTx</td><td>where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or UART peripheral. </td></tr>
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<tr><td class="paramname">USART_FLAG</td><td>specifies the flag to clear. This parameter can be any combination of the following values: <ul>
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<li>USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5). </li>
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<li>USART_FLAG_LBD: LIN Break detection flag. </li>
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<li>USART_FLAG_TC: Transmission Complete flag. </li>
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<li>USART_FLAG_RXNE: Receive data register not empty flag.</li>
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</ul>
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</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>PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun error) and IDLE (Idle line detected) flags are cleared by software sequence: a read operation to USART_SR register (<a class="el" href="group___u_s_a_r_t___group9.html#ga144630722defc9e312f0ad280b68e9da" title="Checks whether the specified USART flag is set or not. ">USART_GetFlagStatus()</a>) followed by a read operation to USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#gac67a91845b0b1d54d31bdfb1c5e9867c" title="Returns the most recent received data by the USARTx peripheral. ">USART_ReceiveData()</a>). </dd>
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<dd>
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RXNE flag can be also cleared by a read to the USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#gac67a91845b0b1d54d31bdfb1c5e9867c" title="Returns the most recent received data by the USARTx peripheral. ">USART_ReceiveData()</a>). </dd>
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<dd>
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TC flag can be also cleared by software sequence: a read operation to USART_SR register (<a class="el" href="group___u_s_a_r_t___group9.html#ga144630722defc9e312f0ad280b68e9da" title="Checks whether the specified USART flag is set or not. ">USART_GetFlagStatus()</a>) followed by a write operation to USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#ga0b43d42da9540f446d494bf69823c6fb" title="Transmits single data through the USARTx peripheral. ">USART_SendData()</a>). </dd>
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<dd>
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TXE flag is cleared only by a write to the USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#ga0b43d42da9540f446d494bf69823c6fb" title="Transmits single data through the USARTx peripheral. ">USART_SendData()</a>).</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">None</td><td></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="ga1fc25d0338695063be5e50156955d9bc"></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 USART_ClearITPendingBit </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> * </td>
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<td class="paramname"><em>USARTx</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>USART_IT</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>Clears the USARTx's interrupt pending bits. </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">USARTx</td><td>where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or UART peripheral. </td></tr>
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<tr><td class="paramname">USART_IT</td><td>specifies the interrupt pending bit to clear. This parameter can be one of the following values: <ul>
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<li>USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) </li>
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<li>USART_IT_LBD: LIN Break detection interrupt </li>
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<li>USART_IT_TC: Transmission complete interrupt. </li>
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<li>USART_IT_RXNE: Receive Data register not empty interrupt.</li>
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</ul>
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</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>PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun error) and IDLE (Idle line detected) pending bits are cleared by software sequence: a read operation to USART_SR register (<a class="el" href="group___u_s_a_r_t___group9.html#ga93d8f031241bcdbe938d091a85295445" title="Checks whether the specified USART interrupt has occurred or not. ">USART_GetITStatus()</a>) followed by a read operation to USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#gac67a91845b0b1d54d31bdfb1c5e9867c" title="Returns the most recent received data by the USARTx peripheral. ">USART_ReceiveData()</a>). </dd>
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<dd>
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RXNE pending bit can be also cleared by a read to the USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#gac67a91845b0b1d54d31bdfb1c5e9867c" title="Returns the most recent received data by the USARTx peripheral. ">USART_ReceiveData()</a>). </dd>
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<dd>
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TC pending bit can be also cleared by software sequence: a read operation to USART_SR register (<a class="el" href="group___u_s_a_r_t___group9.html#ga93d8f031241bcdbe938d091a85295445" title="Checks whether the specified USART interrupt has occurred or not. ">USART_GetITStatus()</a>) followed by a write operation to USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#ga0b43d42da9540f446d494bf69823c6fb" title="Transmits single data through the USARTx peripheral. ">USART_SendData()</a>). </dd>
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<dd>
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TXE pending bit is cleared only by a write to the USART_DR register (<a class="el" href="group___u_s_a_r_t___group2.html#ga0b43d42da9540f446d494bf69823c6fb" title="Transmits single data through the USARTx peripheral. ">USART_SendData()</a>).</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">None</td><td></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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<tr>
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<td class="memname">FlagStatus USART_GetFlagStatus </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> * </td>
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<td class="paramname"><em>USARTx</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>USART_FLAG</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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</div><div class="memdoc">
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<p>Checks whether the specified USART flag is set or not. </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">USARTx</td><td>where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or UART peripheral. </td></tr>
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<tr><td class="paramname">USART_FLAG</td><td>specifies the flag to check. This parameter can be one of the following values: <ul>
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<li>USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5) </li>
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<li>USART_FLAG_LBD: LIN Break detection flag </li>
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<li>USART_FLAG_TXE: Transmit data register empty flag </li>
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<li>USART_FLAG_TC: Transmission Complete flag </li>
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<li>USART_FLAG_RXNE: Receive data register not empty flag </li>
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<li>USART_FLAG_IDLE: Idle <a class="el" href="struct_line.html">Line</a> detection flag </li>
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<li>USART_FLAG_ORE: OverRun Error flag </li>
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<li>USART_FLAG_NE: Noise Error flag </li>
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<li>USART_FLAG_FE: Framing Error flag </li>
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<li>USART_FLAG_PE: Parity Error flag </li>
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</ul>
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</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>new state of USART_FLAG (SET or RESET). </td></tr>
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</table>
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</dd>
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</dl>
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<div class="memitem">
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<td class="memname">ITStatus USART_GetITStatus </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> * </td>
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<td class="paramname"><em>USARTx</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>USART_IT</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>Checks whether the specified USART interrupt has occurred or not. </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">USARTx</td><td>where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or UART peripheral. </td></tr>
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<tr><td class="paramname">USART_IT</td><td>specifies the USART interrupt source to check. This parameter can be one of the following values: <ul>
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<li>USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) </li>
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<li>USART_IT_LBD: LIN Break detection interrupt </li>
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<li>USART_IT_TXE: Transmit Data Register empty interrupt </li>
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<li>USART_IT_TC: Transmission complete interrupt </li>
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<li>USART_IT_RXNE: Receive Data register not empty interrupt </li>
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<li>USART_IT_IDLE: Idle line detection interrupt </li>
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<li>USART_IT_ORE_RX : OverRun Error interrupt if the RXNEIE bit is set </li>
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<li>USART_IT_ORE_ER : OverRun Error interrupt if the EIE bit is set </li>
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<li>USART_IT_NE: Noise Error interrupt </li>
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<li>USART_IT_FE: Framing Error interrupt </li>
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<li>USART_IT_PE: Parity Error interrupt </li>
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</ul>
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</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>new state of USART_IT (SET or RESET). </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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<a class="anchor" id="ga6d8f2dd1f34060ae7e386e3e5d56b6f6"></a>
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<td class="memname">void USART_ITConfig </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="struct_u_s_a_r_t___type_def.html">USART_TypeDef</a> * </td>
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<td class="paramname"><em>USARTx</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>USART_IT</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">FunctionalState </td>
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<td class="paramname"><em>NewState</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>Enables or disables the specified USART interrupts. </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">USARTx</td><td>where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or UART peripheral. </td></tr>
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<tr><td class="paramname">USART_IT</td><td>specifies the USART interrupt sources to be enabled or disabled. This parameter can be one of the following values: <ul>
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<li>USART_IT_CTS: CTS change interrupt </li>
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<li>USART_IT_LBD: LIN Break detection interrupt </li>
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<li>USART_IT_TXE: Transmit Data Register empty interrupt </li>
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<li>USART_IT_TC: Transmission complete interrupt </li>
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<li>USART_IT_RXNE: Receive Data register not empty interrupt </li>
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<li>USART_IT_IDLE: Idle line detection interrupt </li>
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<li>USART_IT_PE: Parity Error interrupt </li>
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<li>USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error) </li>
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</ul>
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</td></tr>
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<tr><td class="paramname">NewState</td><td>new state of the specified USARTx interrupts. This parameter can be: ENABLE or DISABLE. </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">None</td><td></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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