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LP-MSPM0L1306: Configure PA8 as input pin, but it doesn't work, PA15 works well instead.

Jimmy Ye
Prodigy 30 points

Part Number: LP-MSPM0L1306
Other Parts Discussed in Thread: MSPM0L1306

Hello,

I am using Launch Pad MSPM0L1306.

I configured PA8 an input pin then use:

DL_GPIO_readPins(GENERIC_GPIO_IN_PORT, GENERIC_GPIO_IN_xxx_PIN)

to see whether the pin is high or low.

However, it doesn't work when the signal is low. I measured it using multimeter it's about 0V but the firmware failed to sense it as low.
Then I switched to use another pin PA15 to implement the same logic --- it works well, able to sense high or low.
What is the problem here?
I doubt if there is some extra hardware connection, so I pulled off J16, J17 jumpers from the launch pad board. but the behavior is still the same.
Could you help me out? Thanks a lot!
  • +1
    Guru 102845 points

    In order to connect PA8 to the Booster Pack header you need to position the J16 jumper towards the "BP" marking in the silkscreen. Removing the jumper connects it to nothing.

    [Ed. Note: My board doesn't seem to match with the schematics in SLAU869B, so I'm kind of dead-reckoning with an ohmmeter. If someone tells you something different, believe that.]