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MSP430F5438A: How to read the status of the PIN which is configured as output pin

Embedded Developer
Prodigy 110 points
Part Number: MSP430F5438A

Hello,

I am using MSP430F5438a controller.

I am configuring the pin as output using PxDIR register. If i want to read the status of the output pin can i use PxIN register.

Example:

P1DIR = 0x01;

if(PxIN & 0x01)

{

do some action;

}

or

if(PxOUT & 0x01)

{

do some action;

}

which is correct and what will be difference of reading the pin status using two register

Thanks in advance

  • 0
    TI__Expert 6635 points
    Hello!

    If you want to read the status of the output pin, you will want to read the PxOUT register (your second option). The PxOUT register is a read/write register that allows you to assign the output pin value and also read the status of this register.

    The PxIN register is a read only register used to read the status of input pins.

    Thanks,

    Mitch

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