Multiplexing pins of LPC55S69

[SrinathVelavan]

Hi, 

I am using LPC55S69 for a custom board development. I need to use the SDIO pins of the LPC MCU for an external WIFI adaptor board and SD Card. In LPC55S69, SDIO and SD are featured together in the same GPIO pins. Can I use the same pin for both WIFI SDIO and SD Card  ( Ex. Pin PIO1_16 can be configured as SD0_CMD. Can I use the same pin to work as CMD pin for both Wifi SDIO and SD Card CMD signals?)

Note: Both the WIFI and SD card are not going to be operated at the same time.

Kindly clarify if the same pin can be used as both SDIO and SD card pins like it is done in RT1170 MCUs.

TIA

[giraffe508 · Accepted solution]

Answered below. 

[SrinathVelavan]

I am currently creating a custom board file for the MCUXPresso IDE to run my SDK on the board. In the Board Support Configuration (.mex) file creation, Is it fine if I mention only one signal name for the pin that has been multiplexed by 2 different signals?? 

Because it doesnot allow me to assign one pin for 2 separate signals.

[SrinathVelavan]

Hello, 

Thank you very much for your detailed explanation. I completely understand what I have to do now. 

To follow-up can 2 individual signals be multiplexed on a same GPIO pin as long as they are either Input or Output?