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<h1 style="margin-bottom: 18pt; text-align: center;" align="center"><span style="font-size: 20pt; font-family: Verdana; color: rgb(51, 102, 255);">Release
Notes for STM32F401-Discovery Board Drivers</span><span style="font-size: 20pt; font-family: Verdana;"><o:p></o:p></span></h1>
<p class="MsoNormal" style="line-height: normal;" align="center"><span style="font-size: 10pt; font-family: Arial; color: black;">Copyright
</span><span style="font-size: 10pt;"><EFBFBD> </span><span style="font-size: 10pt; font-family: Arial; color: black;">2017 STMicroelectronics</span></p>
<p class="MsoNormal" align="center"> <img style="border: 0px solid ; width: 86px; height: 65px;" alt="" id="_rnc_img0" src="../../../_htmresc/st_logo.png"> </p>
<p class="MsoNormal" style="text-align: center;" align="center"><span style="font-size: 10pt; font-family: Arial; color: black;"></span><span style="font-size: 10pt;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family: Arial; display: none;"><o:p>&nbsp;</o:p></span></p>
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<td style="padding: 0cm;" valign="top"><span style="font-family: Arial;"><span style="font-style: italic;"><span style="font-weight: bold;"></span></span></span><p class="MsoListParagraph" style="text-align: left;"><span style="font-family: &quot;Arial&quot;,sans-serif; font-size: 11pt;">The
BSP (Board Specific Package) drivers are parts of the STM32Cube package
based on the HAL drivers and provide a set of high level APIs relative
to the hardware components and features in the evaluation boards,
discovery kits and nucleo boards coming with the STM32Cube package for
a given STM32 serie.</span></p><p class="MsoListParagraph" style="text-align: left;"><span style="font-family: &quot;Arial&quot;,sans-serif; font-size: 11pt;">The
BSP drivers allow a quick access to the boards&#8217; services using high
level APIs and without any specific configuration as the link with the
HAL and the external components is done in intrinsic within the
drivers. <br></span></p><p class="MsoListParagraph" style="text-align: left;"><span style="font-family: &quot;Arial&quot;,sans-serif; font-size: 11pt;">From
project settings points of view, user has only to add the necessary
driver&#8217;s files in the workspace and call the needed functions from
examples. However some low level configuration functions are weak and
can be overridden by the applications if user wants to change some BSP
drivers default behavior.</span></p><h2 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial;"><span style="font-size: 12pt; color: white;">Update History</span></h2><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 215px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.2.3 / 21-September-2017 <o:p></o:p></span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
<span style="font-size: 10pt; font-family: Verdana;"></span>
<span style="font-size: 10pt; font-family: Verdana;"></span>
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<span style="font-size: 10pt; font-family: Verdana;"></span>
<ul style="list-style-type: square;"><li><span style="font-size: 10pt; font-family: Verdana;">Remove date &amp; version</span></li><li><span style="font-family: Verdana; font-size: 10pt;">Add general description of BSP drivers</span></li><li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_</span><span style="font-size: 10pt; font-family: Verdana;">discovery</span><span style="font-size: 10pt; font-family: Verdana;"></span><span style="font-size: 10pt; font-family: Verdana;">_audio.c/.h:</span></li><ul><li><span style="font-size: 10pt; font-family: Verdana;">Aligned with PDM&nbsp;library v3.0.0&nbsp;</span></li></ul><li><span style="font-family: Verdana; font-size: 10pt;"><span style="font-style: italic; font-weight: bold; text-decoration: underline;">Notes:</span> <br>
</span></li><ul><li><span style="font-family: Verdana; font-size: 10pt;">This version must be used with v3.0.0 of PDM library</span></li></ul></ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 204px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.2.2 / 27-January-2017 <o:p></o:p></span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes</span></u></b><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;"><o:p></o:p></span></u></b></p>
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<li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt; list-style-type: square;"><span style="font-size: 10pt; font-family: Verdana;">Replace __PPP_CLK_ENABLE/DISABLE with __HAL_RCC_PPP</span><span style="font-size: 10pt; font-family: Verdana;">_ENABLE/DISABLE</span></li><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="font-size: 10pt; font-family: Verdana;">Add BSP_AUDIO_OUT_ClockConfig, BSP_AUDIO_OUT_MspInit and BSP_AUDIO_OUT_MspDeInit as weak functions</span></li><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="font-size: 10pt; font-family: Verdana;">Add BSP_AUDIO_IN_ClockConfig, BSP_AUDIO_IN_MspInit and BSP_AUDIO_IN_MspDeInit as weak functions</span></li>
</ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 207px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.2.1 / 12-January-2016</span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes</span></u></b><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;"><o:p></o:p></span></u></b></p>
<ul style="margin-top: 0cm;" type="square"><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="color: rgb(0, 0, 0); font-family: Verdana,sans-serif; font-size: 13.3333px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; display: inline ! important; float: none;">General&nbsp;updates to fix&nbsp;doxygen errors</span><span style="font-size: 10pt; font-family: Verdana;"></span></li><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="font-size: 10pt; font-family: Verdana;">Add STM32F401-Discovery_BSP_User_Manual.chm file</span></li><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery_audio.c</span><span style="font-size: 10pt; font-family: Verdana;"> </span></li><ul><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="font-size: 10pt; font-family: Verdana;">BSP_AUDIO_OUT_Init() update to configure correctly the PLL I2S parameters</span></li></ul></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 204px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.2.0 / 14-August-2015 <o:p></o:p></span></h3><p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
<ul style="margin-top: 0cm;" type="square"><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">stm32f401_</span><span style="font-size: 10pt; font-family: Verdana;">discovery.c</span></li><ul><li class="MsoNormal" style="margin: 4.5pt 0in; font-size: 12pt; font-family: 'Times New Roman'; color: black;"><span style="font-size: 10pt; font-family: Verdana;">Add AUDIO_IO_DeInit() function to align with BSP Components Common drivers V4.0.0</span></li></ul></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 180px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.1.3 / 02-March-2015 <o:p></o:p></span></h3><p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
<ul style="margin-top: 0cm;" type="square"><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">stm32f401_</span><span style="font-size: 10pt; font-family: Verdana;">discovery.c/.h </span></li><ul><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: &quot;Arial&quot;,&quot;sans-serif&quot;; color: rgb(0, 32, 82);" lang="EN-US">Align to STM32F4xx HAL Driver V1.3.0 for
__HAL_RCC_PPP_CLK_ENABLE() </span><span style="font-size: 10pt; font-family: Verdana;">.</span><br><span style="font-size: 10pt; font-family: Arial; color: white;"></span></li></ul></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 212px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.1.2 / 10-December-2014 <o:p></o:p></span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
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<ul style="list-style-type: square;">
<li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery_accelerometer.h, stm32f401_discovery_audio.h and stm32f401_discovery_gyroscope.h:</span></li><ul><li><span style="font-size: 10pt; font-family: Verdana;">Change "\" by "/" in the include path to fix compilation issue under Linux</span></li></ul>
</ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 180px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.1.1 / 26-June-2014 <o:p></o:p></span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
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<ul style="list-style-type: square;">
<li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery_audio.c/.h</span></li><ul><li><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic;">BSP_AUDIO_OUT_Play()</span>: uses the buffer size in byte instead of half-word</span></li><li><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic;">BSP_AUDIO_IN_PDMToPCM()</span>: duplicates samples to make stereo audio stream (since a single microphone in mounted on STM32F401-Discovery)</span></li><li><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic;">I2S2_Init()</span>: configures the I2S to clock the microphone at 1.024 MHz as required instead of 2.048MHz</span></li></ul>
</ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 180px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.1.0 / 19-June-2014 <o:p></o:p></span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
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<ul style="list-style-type: square;">
<li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery.c/.h</span></li>
<ul>
<li><span style="font-size: 10pt; font-family: Verdana;">Enhance BSP_PB_Init() function by removing the call of __SYSCFG_CLK_ENABLE() already enabled in the HAL_GPIO_Init()</span></li>
</ul>
<li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery_audio.c/.h</span></li>
<ul>
<li><span style="font-size: 10pt; font-family: Verdana;">Add note that only the audio stereo format is supported</span></li>
</ul>
<li><span style="font-size: 10pt; font-family: Verdana;">stm32f401_discovery_gyroscope.c/.h</span></li>
<ul>
<li><span style="font-size: 10pt; font-family: Verdana;">Update BSP_GYRO_Init() to support new L3GD20 device ID (I_AM_L3GD20_TR)</span></li>
</ul>
<li><span style="font-size: 10pt; font-family: Verdana;">Comments clean up and typo corrections</span></li>
</ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 215px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.0.0 / 18-February-2014 <o:p></o:p></span></h3>
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<ul style="list-style-type: square;">
<li><span style="font-size: 10pt; font-family: Verdana;">Major update
based on STM32Cube specification: drivers architecture and APIs
modified vs. V1.0.1, and thus the 2 versions are not compatible.<br>
</span></li><li style="font-weight: bold;"><span style="font-size: 10pt; font-family: Verdana;">This version has to be used only with </span><span style="font-size: 10pt; font-family: Verdana;">STM32CubeF4</span><span style="font-size: 10pt; font-family: Verdana;"> based development</span></li>
</ul>
<h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 212px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.0.1 / 14-November-2013</span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
<ul style="margin-top: 0cm;" type="square"><li class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman';"><span style="font-size: 10pt; font-family: Verdana,sans-serif;">stm32f429i_discovery_l3gd20.c
: Set SPI baudrate to 5.25 MHz to fit Gyroscope timing characteristics
(Gyroscope l3gd20 SPI interface max baud rate is 10MHz for write/read)</span></li></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; margin-right: 500pt; width: 216px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.0.0 / 11-September-2013</span></h3>
<p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt;"><b style=""><u><span style="font-size: 10pt; font-family: Verdana; color: black;">Main
Changes<o:p></o:p></span></u></b></p>
<ul style="margin-top: 0cm;" type="square"><li class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;">First official version of the<span style="font-weight: bold; font-style: italic;"> STM32F401-Discovery Board&nbsp;Drivers</span></span></li></ul><span style="font-size: 10pt; font-family: Verdana;"><span style="font-weight: bold; font-style: italic;"></span></span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic; font-weight: bold;"></span></span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic; font-weight: bold;"></span></span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic; font-weight: bold;"></span></span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic; font-weight: bold;"></span></span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic; font-weight: bold;"></span></span><span style="font-size: 10pt; font-family: Verdana;"></span><h2 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial;"><a name="License"></a><span style="font-size: 12pt; color: white;">License<o:p></o:p></span></h2>
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<div style="margin-left: 160px;"><span style="font-size: 10pt; font-family: Verdana; color: black;">For
complete documentation on </span><span style="font-size: 10pt; font-family: Verdana;">STM32<span style="color: black;">&nbsp;Microcontrollers
visit </span><u><span style="color: blue;"><a href="http://www.st.com/internet/mcu/class/1734.jsp" target="_blank">www.st.com/STM32</a></span></u></span></div>
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