CCS/MSP-EXP430FR4133: About UART transmit signal while the lights turns round

Tool/software: Code Composer Studio

Hi!

First of all, I have to admit that I am absolutely new to both C language and microcontroller.

I have asked a question before about communication through UART and I have been directed to CCS.

However, when I try to simply combine two different code together, there are some problems.

I have been taught before and got a code about turning lights blinking as a circle(It really works!) But when I add UART_01 code to it, the MSP430 can only communicate with PC but the light part doesn't work. Why did that happen?

Here is my code for it.   I use IAR for my work. Waiting for reply

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#include <msp430.h>
#include <driverlib.h>
#include "LedDriver.h"

void Init_GPIO();

int main(void)
{
//Default MCLK = 1MHz

unsigned int i = 0;
unsigned char dialValue = 0x01; //ask the first light to turn on
unsigned int pinState;
unsigned int lastState=1;
unsigned int dialGoingCW=1;
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

initialiseLedDial();
//Switch 1 //configure a pin as an input
GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN3);

// Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
PMM_unlockLPM5();

// Configure GPIO
Init_GPIO();
PM5CTL0 &= ~LOCKLPM5; // Disable the GPIO power-on default high-impedance mode
// to activate 1previously configured port settings

__bis_SR_register(SCG0); // disable FLL
CSCTL3 |= SELREF__REFOCLK; // Set REFO as FLL reference source
CSCTL0 = 0; // clear DCO and MOD registers
CSCTL1 &= ~(DCORSEL_7); // Clear DCO frequency select bits first
CSCTL1 |= DCORSEL_3; // Set DCO = 8MHz
CSCTL2 = FLLD_0 + 243; // DCODIV = 8MHz
__delay_cycles(3);
__bic_SR_register(SCG0); // enable FLL
while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // Poll until FLL is locked

CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK; // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
// default DCODIV as MCLK and SMCLK source

// Configure UART pins
P1SEL0 |= BIT0 | BIT1; // set 2-UART pin as second function

// Configure UART
UCA0CTLW0 |= UCSWRST;
UCA0CTLW0 |= UCSSEL__SMCLK;

// Baud Rate calculation
// 8000000/(16*9600) = 52.083
// Fractional portion = 0.083
// User's Guide Table 14-4: UCBRSx = 0x49
// UCBRFx = int ( (52.083-52)*16) = 1
UCA0BR0 = 52; // 8000000/16/9600
UCA0BR1 = 0x00;
UCA0MCTLW = 0x4900 | UCOS16 | UCBRF_1;

UCA0CTLW0 &= ~UCSWRST; // Initialize eUSCI
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt

__bis_SR_register(LPM3_bits|GIE); // Enter LPM3, interrupts enabled
__no_operation(); // For debugger






while(1) //every step on mean function will recall this part to test button state
{
//test button state
pinState = GPIO_getInputPinValue(GPIO_PORT_P1, GPIO_PIN3);

if(lastState==1)//botton not being pressed
{
if(pinState==0)
{
dialGoingCW=!dialGoingCW;
__delay_cycles(10000);//Dealy 10 ms;
}
}
lastState=pinState;

//updated value
if(1==dialGoingCW)
{
dialValue = dialValue * 0x02;
if(0x00 == dialValue)
dialValue = 0x01;
}
else
{
dialValue = dialValue / 0x02;
if(0x00 == dialValue)
dialValue = 0x80;
}

//Set value
setLedDial(dialValue);

//Refresh display (10 times for each position)
for(i = 0; i < 10; i++)
refreshLedDial();

}
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch(__even_in_range(UCA0IV,USCI_UART_UCTXCPTIFG))
{
case USCI_NONE: break;
case USCI_UART_UCRXIFG:
while(!(UCA0IFG&UCTXIFG));
UCA0TXBUF = UCA0RXBUF;
__no_operation();
break;
case USCI_UART_UCTXIFG: break;
case USCI_UART_UCSTTIFG: break;
case USCI_UART_UCTXCPTIFG: break;
default: break;
}
}

void Init_GPIO()
{
P1DIR = 0xFF; P2DIR = 0xFF; P3DIR = 0xFF; P4DIR = 0xFF;
P5DIR = 0xFF; P6DIR = 0xFF; P7DIR = 0xFF; P8DIR = 0xFF;
P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF; P4REN = 0xFF;
P5REN = 0xFF; P6REN = 0xFF; P7REN = 0xFF; P8REN = 0xFF;
P1OUT = 0x00; P2OUT = 0x00; P3OUT = 0x00; P4OUT = 0x00;
P5OUT = 0x00; P6OUT = 0x00; P7OUT = 0x00; P8OUT = 0x00;
}