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DFSDM internal peripheral: Difference between revisions

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<noinclude>{{ApplicableFor
<noinclude>{{ApplicableFor
|MPUs list=STM32MP13x,STM32MP15x
|MPUs list=STM32MP13x,STM32MP15x
|MPUs checklist=STM32MP13x, STM32MP15x
|MPUs checklist=STM32MP13x, STM32MP15x, STM32MP25x
}}</noinclude>
}}</noinclude>


==Article purpose==
==Article purpose==
The purpose of this article is to
The purpose of this article is to:
* briefly introduce the DFSDM peripheral and its main features
* briefly introduce the DFSDM peripheral and its main features,
* indicate the level of security supported by this hardware block
* indicate the peripheral instances assignment at boot time and their assignment at runtime (including whether instances can be allocated to secure contexts),
* explain how each instance can be allocated to the runtime contexts and linked to the corresponding software components
* list the software frameworks and drivers managing the peripheral,
* explain, when needed, how to configure the DFSDM peripheral.
* explain how to configure the peripheral.


==Peripheral overview==
==Peripheral overview==
The '''DFSDM''' peripheral (Digital Filter for Sigma-Delta Modulator) is used as a generic ADC. It benefits from external analog frontend interfaces and internal digital filters.<br />
The '''DFSDM''' (Digital Filter for Sigma-Delta Modulator) peripheral is used as a generic ADC. It benefits from external analog frontend interfaces and internal digital filters.<br />
It can be used in various applications<ref name="DFSDM training">[https://st-onlinetraining.s3.amazonaws.com/STM32L4_System_Digital_Filter_for_SD_Modulators_interface_(DFSDM)/index.html STM32L4 System Digital Filter for SD Modulators interface], online DFSDM training from STMicroelectronics</ref> such as: '''audio record''' with MEMS microphones, '''energy measurement''' with STPMS2<ref name="STPMS2">[https://www.st.com/en/data-converters/stpms2.html STPMS2] "Smart sensor" device</ref> for electricity meters or motor control...
It can be used in various applications<ref name="DFSDM training">[https://st-onlinetraining.s3.amazonaws.com/STM32L4_System_Digital_Filter_for_SD_Modulators_interface_(DFSDM)/index.html STM32L4 System Digital Filter for SD Modulators interface], online DFSDM training from STMicroelectronics</ref> such as: '''audio record''' with MEMS microphones, '''energy measurement''' with STPMS2<ref name="STPMS2">[https://www.st.com/en/data-converters/stpms2.html STPMS2] "Smart sensor" device</ref> for electricity meters or motor control...


===Features===
The '''DFSDM''' peripheral provides several features, among which:
The '''DFSDM''' peripheral provides several features, among which:
* Serial or parallel input '''channels''':
* Serial or parallel input '''channels''':
** External analog frontend serial interfaces (SPI, manchester coded single wire interface, clock output), for various sigma-delta modulators
** External analog frontend serial interfaces (SPI, manchester coded single wire interface, clock output), for various sigma-delta modulators
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|}
|}


Refer to [[STM32MP13 resources#Reference manuals|STM32MP13 reference manuals]] or [[STM32MP15 resources#Reference manuals|STM32MP15 reference manuals]] for the complete features list, and to the software components, introduced below, to know which features are really implemented.
Refer to the [[STM32 MPU resources#Reference manuals|STM32 MPU reference manuals]] for the complete list of features, and to the software frameworks and drivers, introduced below, to see which features are implemented.
 
===Security support===
The DFSDM is a '''non-secure''' peripheral.
 
==Peripheral usage and associated software==
===Boot time===
The DFSDM is not used at boot time.


===Runtime===
==Peripheral usage==
====Overview====
This chapter is applicable in the scope of the '''OpenSTLinux BSP''' running on the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-A processor(s), and the '''STM32CubeMPU Package''' running on the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-M processor.
The DFSDM can be allocated to:
* the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-A7 non-secure core to be used under Linux<sup>&reg;</sup> by the [[IIO overview|IIO]] or [[ALSA overview|ALSA]] framework
or
* the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-M4 for using in STM32Cube by [[STM32CubeMP1 architecture|STM32Cube DFSDM driver]] (on {{MicroprocessorDevice | device=15}}).


The [[#Peripheral assignment|peripheral assignment]] chapter describes which peripheral instance can be assigned to which context.
===Boot time assignment===
The DFSDM peripheral is not used at boot time.


====Software frameworks====
===Runtime assignment===
===== On {{MicroprocessorDevice | device=13}} =====
====On {{MicroprocessorDevice | device=13}}====
{{:STM32MP13_internal_peripherals_software_table_template}}
{{#lst:STM32MP1_internal_peripherals_assignment_table_template|stm32mp13_runtime}}
| Analog
<section begin=stm32mp13_runtime />
| [[DFSDM internal peripheral|DFSDM]]
|
| [[IIO overview|Linux IIO framework]]<br>[[ALSA overview|Linux ALSA framework]]
|
|-
|}
 
===== On {{MicroprocessorDevice | device=15}} =====
{{:STM32MP15_internal_peripherals_software_table_template}}
| Analog
| [[DFSDM internal peripheral|DFSDM]]
|
| [[IIO overview|Linux IIO framework]]<br>[[ALSA overview|Linux ALSA framework]]
| [[STM32CubeMP1 architecture|STM32Cube DFSDM driver]]
|
|-
|}
 
====Peripheral configuration====
The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration by itself can be performed via the [[STM32CubeMX]] tool for all internal peripherals. It can then be manually completed (especially for external peripherals) according to the information given in the corresponding software framework article.
 
For the Linux kernel configuration, please refer to [[DFSDM device tree configuration]] and [[DFSDM Linux driver]] articles.
 
====Peripheral assignment====
===== On {{MicroprocessorDevice | device=13}} =====
{{:STM32MP13_internal_peripherals_assignment_table_template}}
<section begin=stm32mp13 />
  | rowspan="1" | Analog
  | rowspan="1" | Analog
  | rowspan="1" | [[DFSDM internal peripheral|DFSDM]]
  | rowspan="1" | [[DFSDM internal peripheral|DFSDM]]
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  | Assignment (single choice)
  | Assignment (single choice)
  |-
  |-
<section end=stm32mp13 />
<section end=stm32mp13_runtime />
|}
|}


===== On {{MicroprocessorDevice | device=15}} =====
====On {{MicroprocessorDevice | device=15}}====
{{:STM32MP15_internal_peripherals_assignment_table_template}}
{{#lst:STM32MP1_internal_peripherals_assignment_table_template|stm32mp15_runtime}}
<section begin=stm32mp15 />
<section begin=stm32mp15_runtime />
  | rowspan="1" | Analog
  | rowspan="1" | Analog
  | rowspan="1" | [[DFSDM internal peripheral|DFSDM]]
  | rowspan="1" | [[DFSDM internal peripheral|DFSDM]]
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  | Assignment (single choice)
  | Assignment (single choice)
  |-
  |-
<section end=stm32mp15 />
<section end=stm32mp15_runtime />
|}
|}
 
==Software frameworks and drivers==
Below are listed the software frameworks and drivers managing the DFSDM peripheral for the embedded software components listed in the above tables.
 
* '''Linux<sup>&reg;</sup>''': [[IIO overview|IIO framework]] or [[ALSA overview|ALSA framework]]
* '''STM32Cube''': {{CodeSource | STM32CubeMP1 | Drivers/STM32MP1xx_HAL_Driver/Src/stm32mp1xx_hal_dfsdm.c | HAL DFSDM driver}}
 
==How to assign and configure the peripheral==
The peripheral assignment can be done via the [[STM32CubeMX]] graphical tool (and manually completed if needed).<br />
This tool also helps to configure the peripheral:
* partial device trees (pin control and clock tree) generation for the OpenSTLinux software components,
* HAL initialization code generation for the STM32CubeMPU Package.
The configuration is applied by the firmware running in the context in which the peripheral is assigned.
 
For the Linux kernel configuration, please refer to [[DFSDM device tree configuration]] and [[DFSDM Linux driver]] articles.


==How to go further==
==How to go further==
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[[Category:Analog peripherals]]
[[Category:Analog peripherals]]
[[Category:Audio peripherals]]
[[Category:Audio peripherals]]
{{ArticleBasedOnModel| Internal peripheral article model}}
{{PublicationRequestId | 8311 | 2018-08-07 | AlainF}}
{{PublicationRequestId | 8311 | 2018-08-07 | AlainF}}
{{ArticleBasedOnModel| Internal peripheral article model}}
{{ReviewsComments|JCT 1840: alignment needed with the last version of the model<br>
[[Category:ToBeAlignedWithModel]]
}}
</noinclude>
</noinclude>

Latest revision as of 15:24, 21 July 2023↑

Applicable for STM32MP13x lines, STM32MP15x lines

1. Article purpose↑

The purpose of this article is to:

  • briefly introduce the DFSDM peripheral and its main features,
  • indicate the peripheral instances assignment at boot time and their assignment at runtime (including whether instances can be allocated to secure contexts),
  • list the software frameworks and drivers managing the peripheral,
  • explain how to configure the peripheral.

2. Peripheral overview↑

The DFSDM (Digital Filter for Sigma-Delta Modulator) peripheral is used as a generic ADC. It benefits from external analog frontend interfaces and internal digital filters.
It can be used in various applications[1] such as: audio record with MEMS microphones, energy measurement with STPMS2[2] for electricity meters or motor control...

The DFSDM peripheral provides several features, among which:

  • Serial or parallel input channels:
    • External analog frontend serial interfaces (SPI, manchester coded single wire interface, clock output), for various sigma-delta modulators
    • Alternative Internal digital parallel interfaces (from internal ADC[3] or memory data stream via DMA[4] or CPU)
  • Digital filters, that offers up to 24-bit final ADC resolution
  • Conversions that can be launched continuously, or using various triggers: by software, TIM[5], LPTIM[6], EXTI[7] or synchronously with DFSDM filter 0
  • Event detectors: analog watchdog high/low thresholds, short-circuit detector, extremes detector
  • Break generation to TIM[5] on analog watchdog or short-circuit detector events
DFSDM features Number of channels Number of filters
STM32MP13x lines Warning.png 4 2
STM32MP15x lines More info.png 8 6

Refer to the STM32 MPU reference manuals for the complete list of features, and to the software frameworks and drivers, introduced below, to see which features are implemented.

3. Peripheral usage↑

This chapter is applicable in the scope of the OpenSTLinux BSP running on the Arm® Cortex®-A processor(s), and the STM32CubeMPU Package running on the Arm® Cortex®-M processor.

3.1. Boot time assignment↑

The DFSDM peripheral is not used at boot time.

3.2. Runtime assignment↑

3.2.1. On STM32MP13x lines Warning.png↑

Click on How to.png to expand or collapse the legend...

Domain Peripheral Runtime allocation Comment How to.png
Instance Cortex-A7
secure
(OP-TEE) 		Cortex-A7
non-secure
(Linux)
Analog DFSDM DFSDM ☐ Assignment (single choice)

3.2.2. On STM32MP15x lines More info.png↑

Click on How to.png to expand or collapse the legend...

Domain Peripheral Runtime allocation Comment How to.png
Instance Cortex-A7
secure
(OP-TEE) 		Cortex-A7
non-secure
(Linux) 		Cortex-M4

(STM32Cube)
Analog DFSDM DFSDM ☐ ☐ Assignment (single choice)

4. Software frameworks and drivers↑

Below are listed the software frameworks and drivers managing the DFSDM peripheral for the embedded software components listed in the above tables.

5. How to assign and configure the peripheral↑

The peripheral assignment can be done via the STM32CubeMX graphical tool (and manually completed if needed).
This tool also helps to configure the peripheral:

  • partial device trees (pin control and clock tree) generation for the OpenSTLinux software components,
  • HAL initialization code generation for the STM32CubeMPU Package.

The configuration is applied by the firmware running in the context in which the peripheral is assigned.

For the Linux kernel configuration, please refer to DFSDM device tree configuration and DFSDM Linux driver articles.

6. How to go further↑

See:

  • STM32L4 System Digital Filter for SD Modulators interface[1], online DFSDM training with application examples from STMicroelectronics
  • Getting started with sigma-delta digital interface[8], application note from STMicroelectronics

7. References↑

  1. ↑ Jump up to: 1.0 1.1 STM32L4 System Digital Filter for SD Modulators interface, online DFSDM training from STMicroelectronics
  2. ↑ STPMS2 "Smart sensor" device
  3. ↑ ADC internal peripheral
  4. ↑ DMA internal peripheral
  5. ↑ Jump up to: 5.0 5.1 TIM internal peripheral
  6. ↑ LPTIM internal peripheral
  7. ↑ EXTI internal peripheral
  8. ↑ Getting started with sigma-delta digital interface, application note from STMicroelectronics


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