How to set-up analog audio line in on STM32H747I-DISCO to receive audio.

[DRamb.1]

 I've worked out how to disable in the MEMs microphone I just want to use the blue 3.5mm input to receive/record the incoming audio. Thanks.

[FBL]

Hello @DRamb.1​,

You can find this STM32CubeH7/Projects/STM32H747I-DISCO/Examples/SPDIFRX/SPDIFRX_AudioPlay at master · STMicroelectronics/STM32CubeH7 (github.com). In this example two boards are used to send and receive audio data by using the

SPDIF RX/TX interfaces

 STM32CubeH7/Projects/STM32H743I-EVAL/Examples/SAI/SAI_AudioPlay at master · STMicroelectronics/STM32CubeH7 (github.com)

To learn more about how to use the SAI HAL API to play an audio file.

[DRamb.1]

Thanks, that project example seems to require two STM32H747I-DISCO boards. Have you not just got a very simple audio loopback project, i.e. audio is sent to the line in of the board and can then be heard on the line out ? Or am I asking too much ?

[FBL]

Hello again @DRamb.1​ 

You can adapt this example to your board STM32CubeH7/Projects/STM32H743I-EVAL/Examples/DFSDM/DFSDM_AudioRecord at master · STMicroelectronics/STM32CubeH7 (github.com)

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Firas

[DRamb.1 · Accepted solution]

Actually a good example for getting audio in/out is the BSP project for the STM32H747I-DISCO board. Downloading the latest version 1.11.0 from: https://www.st.com/en/embedded-software/stm32cubeh7.html

And the code for the project in:

.\STM32Cube_FW_H7_V1.11.0\Projects\STM32H747I-DISCO\Examples\BSP\STM32CubeIDE

the Audio Record option looks quite useful.

Unfortunately, this BSP project code doesn't run on the board as the LCD screen just displays random pixels - maybe I'm hoping too much for ST example code to work first time !

[FBL]

Hello @DRamb.1​,

Probably you were facing the same issue as the one reported here.

[DRamb.1]

Well yes, this is the issue I reported ?

[FBL]

Hello again @DRamb.1​,

.GUI_NUMBYTES_section (NOLOAD) : { *(.GUI_NUMBYTES_section) } >SDRAM

should be defined in the linker file.

Check this path STM32Cube\Repository\STM32CubeH7-master\Projects\STM32H747I-DISCO\Demonstrations\MenuLauncher\Gui\Target\GUIConf.c to look for GUI_NUMBYTES

I am not sure if this can help.

[MOEZBEJ]

Hello @DRamb.1​ 

I confirm the issue on my side, In fact , the problem is Hardware issue in Video mode with LCD DSI MB166 rev A03 , it has been reported to HW team to fix it ,

Sorry for this inconvenience , we will updated you the fix as soon as possible

Thank you

Br

Moez

[MOEZBEJ]

Hello DRamb.1 ,

The fix is available on GitHub :

https://github.com/STMicroelectronics/STM32CubeH7/commit/1c84713102f8509deb79ae14db8dbb104c17c45e#diff-8a5b12f7040dfb560c495dc0a1213725ba939bf19d531dd1e97067b6a1a79ec0

In fact , LCD DSI MB1166-A9 delivered with latest version of STM32H747I-DISCO/ boards come based on LCD FGRIDA FRD400B25025-A-CTK instead of FRD397B25009-D-CTK.

Now the firmware is updated , you just need to enable the right hardware component as defined in stm32h747i_discovery_conf.h file and add the new component library (NT35510) in your project .

/* IMPORTANT: One of the following flags must be enabled in stm32h747i_discovery_conf.h file */

/* options in order to select the target daughter board revision connected on STM32H747I DISCOVERY : !!!!!!!!!! */

/* USE_LCD_CTRL_OTM8009A */ /* Applicable for all LCD daughter boards (MB1166) except for Rev -A09 */

/* USE_LCD_CTRL_NT35510 */ /* Applicable only for LCD daughter boards (MB1166) Rev -A09 */