TDA4VM: TDA4 Pin Multiplexing

Hui-Liu

Expert 1420 points

Part Number: TDA4VM

Can Linux application switch pin functions directly? Do I need to reboot the board?

Or do I need to change bootloader code to switch the pin functions?

the pin multiplexing circuit in TDA4 CPB(EVM) like below:

over 4 years ago

0 Keerthy J over 4 years ago

TI__Guru*** 139190 points

Hi,

1) No runtime changing of pinmux.

2) You have incorporate the pin mux changes in dts file.

There is a pinmux tool to aid you for all that.

https://dev.ti.com/sysconfig/?fromPinmux=true#/config/?args=--device%20J721E_DRA829_TDA4VM_AM752x%20--part%20Default%20--package%20ALF%20--theme%20light

This is the pinmux tool which you can use to configure the PADCONFIG registers for any module. For ex: GPIO.
You need to pick the exact module instance and most importantly for each pin pick the ball correctly(Refer schematics for the exact ball number).
Then the pinmux tool itself is intelligent enough to generate the dts node for you in Linux.

Regards,
Keerthy

0 Hui-Liu over 4 years ago in reply to Keerthy J

Expert 1420 points

Thanks a lot.

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TDA4VM: TDA4 Pin Multiplexing