MSP430FR59941: MSP430FR UART TX Line Not Driving

My first guess is that the P2SEL bits aren't being set correctly. (For both cases, it should be P2SEL1=1 and P2SEL0=0.)

Can you show your initialization code?

//disable high impedance
PM5CTL0 &= ~LOCKLPM5;

// Set DCO to 1MHz
CSCTL0_H = CSKEY_H; // Unlock clock registers
CSCTL1 = DCOFSEL_0; // DCO = 1MHz
CSCTL2 = SELS__DCOCLK | SELM__DCOCLK; // Set SMCLK = DCO, MCLK = DCO
CSCTL3 = DIVS__1; // SMCLK = DCO / 1
CSCTL0_H = 0; // Lock clock registers

// Setup P2.0, P2.1 for UART
P2SEL0 |= BIT0 | BIT1;
P2SEL1 &= ~(BIT0 | BIT1);

// Initialize eUSCI_A0 UART
UCA0CTLW0 |= UCSWRST; // Put eUSCI in reset
UCA0CTLW0 |= UCSSEL__SMCLK; // Select SMCLK

// Baud Rate calculation (1MHz / 9600)
UCA0BRW = 6; // 1MHz/9600 ~ 104
UCA0MCTLW = (8 << 4) | UCOS16 | (0x20 << 8);
// UCBRF = 8, UCOS16 = 1, UCBRS = 0x20

UCA0CTLW0 &= ~UCSWRST; // Release from reset
UCA0IE &= ~UCRXIE; // Disable RX interrupt (for now)

If this is a launchpad, make sure there is nothing else connected to the port.

It is the launchpad. I disconnected the uart tx rx jumpers after programming and it seemed to do the same thing

think that was the problem