MSP-EXP430G2: P1.1 and P1.2 used as output pins

Honglu He

Part Number: MSP-EXP430G2

I want to use all 16 pins as output pins, but I noticed that even if I set all of them to 0, P1.1 and P1.2, which has (UART) next to them, are always high. Anyone has an idea how to solve this problem?

over 7 years ago

0 Mike Tooma over 7 years ago

Genius 3255 points

Did you remove the TXD and RXD J3 jumpers?

0 Honglu He over 7 years ago in reply to Mike Tooma

Prodigy 40 points

Yes I have tried that accoring to online post before, but P1.2 still stays high no matter what.

0 Mike Tooma over 7 years ago in reply to Honglu He

Genius 3255 points

Are you sure P1.1 and P1.2 in your code are not selected for the secondary function?

0 Honglu He over 7 years ago in reply to Mike Tooma

Prodigy 40 points

P1SEL &= ~0xff;
    P1SEL2 &= ~0xff;
    P1REN = 0x0;
    P1DIR |= 0xff;
    P1OUT &= 0x00;

This is all my set up for prot 1. And I have also unplug the jumper in J3 marked RXD and TXD

0 Bruce McKenney over 7 years ago in reply to Honglu He

Guru 96125 points

I just pasted those lines (followed by a while(1)) and put it on a G2 (R1.5) Launchpad, and all the P1 pins read low.

What else does your program do?

0 Honglu He over 7 years ago in reply to Bruce McKenney

Prodigy 40 points

Thanks for your help, I found out that there was actually a line: Init_UART(9600,1); in my code, which enables the uart serial communication, so p1.1 and p1.2 are always high. I get it fix after I comment out this line.

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MSP-EXP430G2: P1.1 and P1.2 used as output pins