https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&feed=atom&action=history
DFSDM Linux driver - Revision history
2024-03-29T12:08:28Z
Revision history for this page on the wiki
MediaWiki 1.31.16
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=94257&oldid=prev
Jean Christophe Trotin at 09:23, 12 July 2023
2023-07-12T09:23:34Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 09:23, 12 July 2023</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l70" >Line 70:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The DFSDM driver uses resources such as clocks and GPIOs.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The DFSDM driver uses resources such as clocks and GPIOs.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Refer to [[Pinctrl_overview#How_to_monitor]] to check DFSDM GPIOs.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Refer to [[Pinctrl_overview#How_to_monitor]] to check DFSDM GPIOs.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Refer to [[Clock_overview#<del class="diffchange diffchange-inline">How_to_monitor_with_debugfs</del>]] to check DFSDM clocks.</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* Refer to [[Clock_overview#<ins class="diffchange diffchange-inline">How_to_monitor_with_debugfs_of_clock_framework</ins>]] to check DFSDM clocks.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== How to monitor with debugfs ====</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== How to monitor with debugfs ====</div></td></tr>
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Jean Christophe Trotin
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=85407&oldid=prev
Nathalie Sangouard at 16:18, 2 June 2022
2022-06-02T16:18:16Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 16:18, 2 June 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l120" >Line 120:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{PublicationRequestId | 9772 | 2018-11-28 | AlainF}}</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{PublicationRequestId | 9772 | 2018-11-28 | AlainF}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{ArticleBasedOnModel | OpenSTLinux <del class="diffchange diffchange-inline">driver </del>article model}}</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{ArticleBasedOnModel | OpenSTLinux <ins class="diffchange diffchange-inline">drivers </ins>article model}}</div></td></tr>
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Nathalie Sangouard
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=85259&oldid=prev
Nathalie Sangouard at 16:34, 30 May 2022
2022-05-30T16:34:59Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 16:34, 30 May 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l120" >Line 120:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{PublicationRequestId | 9772 | 2018-11-28 | AlainF}}</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{PublicationRequestId | 9772 | 2018-11-28 | AlainF}}</div></td></tr>
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Nathalie Sangouard
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=79397&oldid=prev
Nathalie Sangouard at 15:34, 12 October 2021
2021-10-12T15:34:40Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 15:34, 12 October 2021</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|MPUs list=STM32MP13x, STM32MP15x</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|MPUs list=STM32MP13x, STM32MP15x</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>|MPUs checklist=STM32MP13x, STM32MP15x</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>|MPUs checklist=STM32MP13x,STM32MP15x</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td></tr>
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Nathalie Sangouard
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=79052&oldid=prev
Nathalie Sangouard at 13:33, 27 September 2021
2021-09-27T13:33:13Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 13:33, 27 September 2021</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{ApplicableFor</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">|MPUs list=STM32MP13x, STM32MP15x</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">|MPUs checklist=STM32MP13x, STM32MP15x</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">}}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td></tr>
</table>
Nathalie Sangouard
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=66304&oldid=prev
Jean Christophe Trotin at 15:09, 16 January 2020
2020-01-16T15:09:40Z
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 15:09, 16 January 2020</td>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==  Article purpose ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><references /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><references /></div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:IIO]]</ins></div></td></tr>
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</table>
Jean Christophe Trotin
https://wiki.st.com/stm32mpu/index.php?title=DFSDM_Linux_driver&diff=43457&oldid=prev
Fgasni00 at 13:48, 28 November 2018
2018-11-28T13:48:56Z
<p></p>
<p><b>New page</b></p><div><noinclude><br />
{{ArticleBasedOnModel | [[Linux driver article model]]}}<br />
{{ArticleMainWriter | FabriceG}}<br />
{{ArticleMainWriter | OlivierM}}<br />
{{ReviewersList | FabriceG, OlivierM, ArnaudP}}<br />
{{ArticleApprovedVersion | FabriceG | OlivierM | No previous approved version | AlainF - 28Nov'18 - 9772 | 28Nov'18}}<br />
[[Category:IIO]]<br />
[[Category:ALSA]]<br />
</noinclude><br />
<br />
== Article purpose ==<br />
The purpose of this article is to introduce the Linux<sup>&reg;</sup> driver for the [[DFSDM internal peripheral]]:<br />
* Which DFSDM features are supported by the driver<br />
* How to configure, use and debug it<br />
* What is the driver structure, where to the find source code.<br />
<br />
== Short Description ==<br />
The DFSDM Linux<sup>&reg;</sup> driver (kernel space) is based on the [[IIO overview|IIO]] and [[ALSA overview|ALSA]] frameworks.<br />
It offers various modes:<br />
# '''IIO direct mode''': single capture on a channel<br />
# '''IIO software buffer''': capture one or more channels<br />
# '''IIO triggered buffer mode''': capture on one or more channels using triggers<br/>It uses hardware triggers available in IIO. See [[TIM Linux driver]] and [[LPTIM Linux driver]].<br />
<br />
It offers an extended API<ref name="stm32-dfsdm-adc-h">{{CodeSource | Linux kernel | include/linux/iio/adc/stm32-dfsdm-adc.h}}, DFSDM IIO custom API</ref> for audio usage which allows '''PDM microphones capture''' through a SPI interface.<br />
<br />
== Configuration ==<br />
=== Kernel configuration ===<br />
Activate the DFSDM Linux<sup>&reg;</sup> driver in the kernel configuration by using the [[Menuconfig or how to configure kernel|menuconfig]] tool.<br />
<br />
==== IIO driver ====<br />
Configuration flag: CONFIG_STM32_DFSDM_ADC<br />
<pre><br />
Device Drivers ---><br />
<*> Industrial I/O support ---><br />
Analog to digital converters ---><br />
<*> STMicroelectronics STM32 dfsdm adc<br />
<*> STMicroelectronics STM32 adc # DFSDM ADC IIO driver<br />
</pre><br />
<br />
When using the DFSDM ADC IIO driver (only), the user must also enable the driver for the external analog front-end (e.g. sigma delta modulator).<br />
The generic sigma delta modulators driver may be used for instance (CONFIG_SD_ADC_MODULATOR):<br />
<pre><br />
Device Drivers ---><br />
<*> Industrial I/O support ---><br />
Analog to digital converters ---><br />
<*> Generic sigma delta modulator # sigma delta modulator driver<br />
</pre><br />
<br />
==== Audio driver ====<br />
Configuration flag: CONFIG_SND_SOC_STM32_DFSDM (Note: This configuration depends on [[#IIO_driver|CONFIG_STM32_DFSDM_ADC]])<br />
<pre><br />
Device Drivers ---><br />
<*> Sound card support ---><br />
<*> Advanced Linux Sound Architecture ---><br />
<*> ALSA for SoC audio support ---><br />
STMicroelectronics STM32 SOC audio support ---><br />
<*> SoC Audio support for STM32 DFSDM # DFSDM Audio driver for digital microphone capture<br />
</pre><br />
=== Device tree ===<br />
Refer to the [[DFSDM device tree configuration]] article when configuring the DFSDM Linux kernel driver.<br />
<br />
== How to use ==<br />
=== IIO driver ===<br />
In "'''IIO direct mode'''", the conversion result can be read directly from '''sysfs''', see:<br />
[[How to use the IIO user space interface#How to do a simple ADC conversion using the sysfs interface|How to do a simple ADC conversion using the sysfs interface]].<br />
<br />
In "'''IIO triggered buffer mode'''", the configuration must be performed by using '''sysfs''' first. Then, '''character device''' (/dev/iio:deviceX) is used to read data, see [[How to use the IIO user space interface#Convert_one_or_more_channels_using_triggered_buffer_mode|Convert one or more channels using triggered buffer mode]].<br />
<br />
For information on the standard IIO consumer interface, please refer to [[IIO_overview#How_to_use_IIO_kernel_API|How to use IIO kernel API]] which gives an example of the IIO consumer kernel API.<br />
<br />
=== Audio driver ===<br />
The DFSDM Linux driver can be accessed from userland through an ALSA device. Refer to [[ALSA_overview#How_to_use|ALSA overview]] for information on how to list and use ALSA devices. <br />
<br />
==How to trace and debug==<br />
=== How to monitor ===<br />
The DFSDM driver uses resources such as clocks and GPIOs.<br />
* Refer to [[Pinctrl_overview#How_to_monitor]] to check DFSDM GPIOs.<br />
* Refer to [[Clock_overview#How_to_monitor_with_debugfs]] to check DFSDM clocks.<br />
<br />
==== How to monitor with debugfs ====<br />
The DFSDM registers are accessed using REGMAP by ''DFSDM Linux<sup>&reg;</sup> driver''.<br />
<br />
It comes with [[Debugfs|debugfs]] entries to dump registers:<br />
$ {{highlight|cd /sys/kernel/debug/regmap/4400d000.dfsdm/}}<br />
$ {{highlight|cat registers}}<br />
000: 00000000<br />
004: 00000000<br />
008: 00000000<br />
<br />
==== Other ways to monitor ====<br />
* Man can check the DFSDM '''interrupts''' and/or the DFSDM '''DMA''' interrupts:<br />
$ {{highlight|cat /proc/interrupts}}<br />
CPU0 CPU1<br />
...<br />
99: 0 0 GIC-0 142 Level 4400d000.dfsdm:filter@0<br />
100: 0 0 GIC-0 143 Level 4400d000.dfsdm:filter@1<br />
101: 0 0 GIC-0 144 Level 4400d000.dfsdm:filter@2<br />
...<br />
<br />
=== How to trace ===<br />
==== IIO driver ====<br />
Refer to [[IIO_overview#How_to_trace_with_dynamic_debug|How to trace with dynamic debug]] for how to enable the debug logs in the driver and in the framework.<br />
{{Board$}} dmesg -n8<br />
{{Board$}} echo "file drivers/iio/adc/stm32-dfsdm* +p" > /sys/kernel/debug/dynamic_debug/control<br />
To enable dynamic debug at boot time, append the following arguments on the kernel command line:<br />
loglevel=8 dyndbg="file drivers/iio/adc/stm32-dfsdm* +p"<br />
==== Audio driver ====<br />
Refer to [[ALSA_overview#How_to_trace]] for details on trace tools.<br />
<br />
=== How to debug ===<br />
==== Audio driver ====<br />
Refer to [[ALSA_overview#How_to_debug]] for details on debugging tools.<br />
<br />
== Source code location ==<br />
It is composed of:<br />
* {{CodeSource | Linux kernel | drivers/iio/adc/stm32-dfsdm-core.c | stm32-dfsdm-core.c}}, core part of DFSDM Linux driver to handle common resources: registers, clock<br />
* {{CodeSource | Linux kernel | drivers/iio/adc/stm32-dfsdm-adc.c | stm32-dfsdm-adc.c}}, ADC part of DFSDM Linux driver to handle '''ADC''' operations<br />
* {{CodeSource | Linux kernel | sound/soc/stm/stm32_adfsdm.c | stm32_adfsdm.c}}, ASoC DAI part of DFSDM Linux driver to handle '''audio''' operations<br />
See also sigma delta modulator driver:<br />
* {{CodeSource | Linux kernel | drivers/iio/adc/sd_adc_modulator.c | sd_adc_modulator.c}}, sigma delta modulator Linux driver to handle analog front-end<br />
==References==<br />
<references /></div>
Fgasni00