查看“SPDIFRX internal peripheral”的源代码

==Article purpose==
The purpose of this article is to:
* briefly introduce the SPDIFRX peripheral and its main features
* indicate the level of security supported by this hardware block
* explain how each instance can be allocated to the three runtime contexts and linked to the corresponding software components
* explain how to configure the SPDFIRX peripheral.

==Peripheral overview==
The '''SPDIFRX''' peripheral, is designed to receive an S/PDIF flow compliant with IEC-60958 and IEC-61937. The SPDIFRX receiver provides two separated paths to retrieve the audio data and the user and channel information.

===Features===
Refer to the [[STM32MP15 resources#Reference manuals|STM32MP15 reference manuals]] for the complete feature list, and to the software components, introduced below, to see which features are implemented.<br>

===Security support===
The SPDFIRX is a '''non secure''' peripheral.

==Peripheral usage and associated software==
===Boot time===
The SPDFIRX is not used at boot time.

===Runtime===
====Overview====
The SPDIFRX instance can be allocated to:
* the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-A7 non-secure for use in Linux with [[ALSA_overview|ALSA framework]]
* the Cortex-M4 for use in STM32Cube with [[STM32CubeMP1 architecture|STM32Cube SPDFIRX driver]]

Chapter [[#Peripheral assignment]] exposes which instance can be assigned to which context.

====Software frameworks====
{{:Internal_peripherals_software_table_template}}
 | Audio
 | [[SPDIFRX internal peripheral|SPDIFRX]]
 | 
 | [[ALSA_overview|ALSA framework]]
 | [[STM32CubeMP1 architecture|STM32Cube SPDIFRX driver]]
 |
 |-
 |}

====Peripheral configuration====
The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration can be done alone via the [[STM32CubeMX]] tool for all internal peripherals, and then manually completed (particularly for external peripherals), according to the information given in the corresponding software framework article.

=====Configuration in Cortex-A7 non-secure software=====
When the Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-A7 core operates in non-secure access mode, the  SPDIFRX is controlled by the Linux kernel framework.
Refer to the [[SPDIFRX Linux driver]] to drive the SPDIFRX through Linux kernel [[ALSA_overview|ALSA framework]]. Refer to [[Soundcard configuration]] and [[SPDIFRX device tree configuration]] to configure the SPDIFRX through Linux kernel device tree<ref>[[Device tree]]</ref>.

=====Arm<sup>&reg;</sup> Cortex<sup>&reg;</sup>-M4 software configuration =====
{{ReviewsComments|To be updated}}

====Peripheral assignment====
{{:Internal_peripherals_assignment_table_template}}
<onlyinclude>
 | rowspan="1" | Audio
 | rowspan="1" | [[SPDIFRX internal peripheral|SPDIFRX]]
 | SPDIFRX
 | 
 | <span title="assignable peripheral" style="font-size:21px">☐</span>
 | <span title="assignable peripheral" style="font-size:21px">☐</span>
 | Assignment (single choice)
 |-
</onlyinclude>
 |}

==How to go further==

The STM32H7 SPDIFRX training <ref>[http://www.st.com/content/ccc/resource/training/technical/product_training/group0/84/82/cd/52/39/88/44/91/STM32F7_Peripheral_SPDIF_RX/files/STM32F7_Peripheral_SPDIF_RX.pdf/_jcr_content/translations/en.STM32F7_Peripheral_SPDIF_RX.pdf| STM32H7 SPDIFRX training]</ref>, introduces the STM32 S/PDIF Receiver interface on the STM32H7. This training  also applies to the STM32 MPU SPDIFRX internal peripheral.

==References==
<references/>