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79*4e871e86SMatthias Ringwald  <meta content="MCD Application Team" name="author"></head><body link="blue" vlink="blue">
80*4e871e86SMatthias Ringwald<div class="Section1">
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98*4e871e86SMatthias Ringwald            <h1 style="margin-bottom: 18pt; text-align: center;" align="center"><span style="font-size: 20pt; font-family: Verdana; color: rgb(51, 102, 255);">Release
99*4e871e86SMatthias RingwaldNotes for PDM audio software decoding Library</span><span style="font-size: 20pt; font-family: Verdana;"><o:p></o:p></span></h1>
100*4e871e86SMatthias Ringwald            <p class="MsoNormal" style="text-align: center;" align="center"><span style="font-size: 10pt; font-family: Arial; color: black;">Copyright
101*4e871e86SMatthias Ringwald2015 STMicroelectronics</span><span style="color: black;"><u1:p></u1:p><o:p></o:p></span></p>
102*4e871e86SMatthias Ringwald            <p class="MsoNormal" style="text-align: center;" align="center"><span style="font-size: 10pt; font-family: Arial; color: black;"><img alt="" id="_x0000_i1025" src="_htmresc/st_logo.png" style="border: 0px solid ; width: 171px; height: 126px;"></span><span style="font-size: 10pt;"><o:p></o:p></span></p>
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107*4e871e86SMatthias Ringwald      <p class="MsoNormal"><span style="font-family: Arial; display: none;"><o:p>&nbsp;</o:p></span></p>
108*4e871e86SMatthias Ringwald      <table class="MsoNormalTable" style="width: 675pt;" border="0" cellpadding="0" width="900">
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112*4e871e86SMatthias Ringwald            <div style="margin-left: 40px;"><span style="font-size: 10pt; font-family: Verdana;">The <span style="font-weight: bold; font-style: italic;">PDM audio software decoding Library</span>
113*4e871e86SMatthias Ringwaldis an optimized software implementation for PDM signal decoding and
114*4e871e86SMatthias Ringwaldaudio signal reconstruction when connecting an <span style="font-weight: bold; font-style: italic;">ST MEMS
115*4e871e86SMatthias Ringwaldmicrophone</span> (</span><span style="font-size: 10pt; font-family: Verdana;">MP45Dxxx, MP34Dxxx)</span><span style="font-size: 10pt; font-family: Verdana;"> with an <span style="font-weight: bold; font-style: italic;">STM32 microcontroller</span>.
116*4e871e86SMatthias RingwaldIt can directly take the Pulse Density Modulated (PDM) data output from
117*4e871e86SMatthias Ringwaldthe microphone and convert it to 16-bit pulse-code modulation (PCM)
118*4e871e86SMatthias Ringwaldformat.</span><br>
119*4e871e86SMatthias Ringwald            <span style="font-size: 10pt; font-family: Verdana;">
120*4e871e86SMatthias Ringwald            </span><br>
121*4e871e86SMatthias Ringwald            <span style="font-size: 10pt; font-family: Verdana;">
122*4e871e86SMatthias Ringwald            </span><span style="font-size: 10pt; font-family: Verdana;">This Library includes one header file <span style="font-style: italic;">pdm_filter.h</span> and binary/object codes running on all STM32 devices. The naming format is <span style="font-weight: bold;">libPDMFilter_<span style="font-style: italic;">CMx</span>_<span style="font-style: italic;">C</span>.a/.lib</span>, where:</span><br>
123*4e871e86SMatthias Ringwald            <span style="font-size: 10pt; font-family: Verdana;"></span></div>
124*4e871e86SMatthias Ringwald            <ul style="margin-top: 0cm; margin-left: 80px;" type="square">
125*4e871e86SMatthias Ringwald<li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">CMx: CortexMx core class (CM0, </span><span style="font-size: 10pt; font-family: Verdana;"></span><span style="font-size: 10pt; font-family: Verdana;">CM3, CM4</span><span style="font-size: 10pt; font-family: Verdana;"> and CM7</span><span style="font-size: 10pt; font-family: Verdana;">)</span><span style="font-size: 10pt; font-family: Verdana;"></span></li><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">C: compiler (IAR, Keil and GCC)</span><span style="font-size: 10pt; font-family: Verdana;"></span><span style="font-size: 10pt; font-family: Verdana;"></span></li>
126*4e871e86SMatthias Ringwald            </ul>
127*4e871e86SMatthias Ringwald            <div style="margin-left: 40px;"><span style="font-size: 10pt; font-family: Verdana;">For more&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;">information</span><span style="font-size: 10pt; font-family: Verdana;"> about this Library, please refer to the document <span style="font-weight: bold; font-style: italic;">"</span></span><span style="font-size: 10pt; font-family: Verdana; font-weight: bold; font-style: italic;">AN3998 </span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-weight: bold; font-style: italic;">PDM audio software decoding on STM32 microcontrollers"</span> </span><span style="font-family: Verdana; font-size: 10pt;">available for download from&nbsp;STMicroelectronics website at <a href="http://www.st.com/internet/mcu/family/141.jsp" target="_blank">www.st.com</a>.</span></div>
128*4e871e86SMatthias Ringwald            <ol style="margin-top: 0cm;" start="1" type="1">
129*4e871e86SMatthias Ringwald
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131*4e871e86SMatthias Ringwald            </ol>
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133*4e871e86SMatthias Ringwald            <span style="font-family: &quot;Times New Roman&quot;;">
134*4e871e86SMatthias Ringwald            </span>
135*4e871e86SMatthias Ringwald            <h2 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><a name="History"></a><span style="font-size: 12pt; color: white;">Update History</span></h2>
136*4e871e86SMatthias Ringwald            <h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 200px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.1.0 / 31-March-2015<o:p></o:p></span></h3>
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141*4e871e86SMatthias Ringwald            <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
142*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
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148*4e871e86SMatthias Ringwald            <ul style="list-style-type: square;">
149*4e871e86SMatthias Ringwald              <li><span style="font-size: 10pt; font-family: Verdana;">Add Binaries for </span><span style="font-size: 10pt; font-family: Verdana;">CortexM7 (CM7) core<br>
150*4e871e86SMatthias Ringwald                </span></li>
151*4e871e86SMatthias Ringwald              <li><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic;">PDM_Filter_128_MSB()</span> and <span style="font-style: italic;">PDM_Filter_128_LSB()</span> functions: enhance volume setting, it was lower than expected</span></li>
152*4e871e86SMatthias Ringwald              <li><span style="font-size: 10pt; font-family: Verdana;"><span style="font-style: italic;">PDM_Filter_64_MSB()</span> function: fix issue when using more than 2 microphones<span style="font-style: italic;"><br>
153*4e871e86SMatthias Ringwald                </span></span></li>
154*4e871e86SMatthias Ringwald            </ul>
155*4e871e86SMatthias Ringwald
156*4e871e86SMatthias Ringwald            <h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 200px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.0.1 / 17-December-2013<o:p></o:p></span></h3>
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159*4e871e86SMatthias Ringwald            <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
160*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
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164*4e871e86SMatthias Ringwald            <ul style="margin-top: 0cm;" type="square">
165*4e871e86SMatthias Ringwald<li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">In <span style="font-style: italic;">HTONS()</span> macro, change <span style="font-style: italic;">u16</span> type by <span style="font-style: italic;">uint16_t</span><br>
166*4e871e86SMatthias Ringwald</span></li>
167*4e871e86SMatthias Ringwald            </ul>
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169*4e871e86SMatthias Ringwald            <h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 200px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V2.0.0 / 07-August-2013<o:p></o:p></span></h3>
170*4e871e86SMatthias Ringwald            <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
171*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
172*4e871e86SMatthias Ringwald
173*4e871e86SMatthias Ringwald            <ul style="margin-top: 0cm;" type="square">
174*4e871e86SMatthias Ringwald<li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">Update Library binary name format</span></li>
175*4e871e86SMatthias Ringwald              <li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">Add Library version optimized for </span><span style="font-size: 10pt; font-family: Verdana;">CM0, CM3 and CM4F cores<br>
176*4e871e86SMatthias Ringwald                </span></li>
177*4e871e86SMatthias Ringwald              <li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">Add functions for decimation factor </span><span style="font-size: 10pt; font-family: Verdana;">128</span></li>
178*4e871e86SMatthias Ringwald            </ul>
179*4e871e86SMatthias Ringwald            <h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 167px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.1.2 / 17-April-2012<o:p></o:p></span></h3>
180*4e871e86SMatthias Ringwald<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
181*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
182*4e871e86SMatthias Ringwald<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;">All source files:&nbsp;license disclaimer text update and add link to the License file on ST Internet.</span></li></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 176px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.1.1 / 30-December-2011<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
183*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
184*4e871e86SMatthias Ringwald<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;">PDM Library moved from <span style="font-style: italic;">Utilities\STM32F4-Discovery</span> to <span style="font-style: italic;">Utilities\STM32_Audio\Addons\PDM</span> folder</span></li><li class="MsoNormal" style="color: black; margin-top: 4.5pt; margin-bottom: 4.5pt;"><span style="font-size: 10pt; font-family: Verdana;">Add new&nbsp;license agreement <span style="font-style: italic;">"MCD-ST Image SW License Agreement V2.pdf"</span></span></li></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 186px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.1.0 / 28-October-2011</span></h3>
185*4e871e86SMatthias Ringwald            <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
186*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
187*4e871e86SMatthias Ringwald
188*4e871e86SMatthias Ringwald            <ul style="margin-top: 0cm;" type="square"><li class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;">Add&nbsp;<span style="font-weight: bold; font-style: italic;">PDM audio software decoding Library</span><span style="font-weight: bold;"></span> drivers, used to decode and reconstruct the audio signal produced by&nbsp;MP45DT02 MEMS microphone from </span><span style="font-size: 10pt; font-family: Arial; color: black;">STMicroelectronics.</span><span style="font-size: 10pt; font-family: Verdana;"><span style="font-weight: bold; font-style: italic;"> </span><span style="font-weight: bold;"></span>For more details about this Library, please refer to document<span style="font-weight: bold; font-style: italic;"> "PDM audio software decoding on STM32 microcontrollers (AN3998)".</span></span><span style="font-size: 10pt; font-family: Verdana;"></span></li><li class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;">stm32f4_discovery_audio_codec.c/.h: update to use DMA instead of Interrupt in I2S communication with the external codec.</span></li></ul><h3 style="background: rgb(51, 102, 255) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; margin-right: 500pt; width: 186px;"><span style="font-size: 10pt; font-family: Arial; color: white;">V1.0.0 / 19-September-2011</span></h3>
189*4e871e86SMatthias Ringwald            <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
190*4e871e86SMatthias RingwaldChanges<o:p></o:p></span></u></b></p>
191*4e871e86SMatthias Ringwald
192*4e871e86SMatthias Ringwald            <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;"> STM32F4-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: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><a name="License"></a><span style="font-size: 12pt; color: white;">License<o:p></o:p></span></h2><p class="MsoNormal"><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;">Licensed under MCD-ST Image SW License Agreement V2, (the "License"); You may not use this&nbsp;</span><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;">package</span><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;"> except in compliance with the License. You may obtain a copy of the License at:<br><br></span></p><div style="text-align: center;"><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a target="_blank" href="http://www.st.com/software_license_agreement_image_v2"><span style="text-decoration: underline;">http://www.st.com/software_license_agreement_image_v2</span></a><a target="_blank" href="http://www.st.com/software_license_agreement_liberty_v2"></a></span><br><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;"></span></div><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;"><br>Unless
193*4e871e86SMatthias Ringwaldrequired by applicable law or agreed to in writing, software
194*4e871e86SMatthias Ringwalddistributed under the License is distributed on an "AS IS" BASIS, <br>WITHOUT
195*4e871e86SMatthias RingwaldWARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
196*4e871e86SMatthias Ringwaldthe License for the specific language governing permissions and
197*4e871e86SMatthias Ringwaldlimitations under the License.</span><b><span style="font-size: 10pt; font-family: Verdana; color: black;"></span></b>
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199*4e871e86SMatthias Ringwald            <div class="MsoNormal" style="text-align: center;" align="center"><span style="color: black;">
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201*4e871e86SMatthias Ringwald            <p class="MsoNormal" style="margin: 4.5pt 0cm 4.5pt 18pt; text-align: center;" align="center"><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;; color: black;">For
202*4e871e86SMatthias Ringwald    complete documentation on </span><span style="font-size: 10pt; font-family: &quot;Verdana&quot;,&quot;sans-serif&quot;;">STM32<span style="color: black;">
203*4e871e86SMatthias Ringwald    Microcontrollers visit </span><u><span style="color: blue;"><a href="http://www.st.com/internet/mcu/family/141.jsp" target="_blank">www.st.com/STM32</a></span></u></span><span style="font-size: 10pt; font-family: Verdana;"><a target="_blank" href="http://www.st.com/internet/mcu/family/141.jsp"><u><span style="color: blue;"></span></u></a></span><span style="font-size: 10pt; font-family: Verdana;"><u><span style="color: blue;"></span></u></span><span style="color: black;"><o:p></o:p></span></p>
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