TM4C123GXL: ADC and UART help

#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "driverlib/adc.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"

int ADCvalue;
float Voltage;

void PLL_Init(void){
  // 0) Use RCC2
  SYSCTL_RCC2_R |=  0x80000000;  // USERCC2
  // 1) bypass PLL while initializing
  SYSCTL_RCC2_R |=  0x00000800;  // BYPASS2, PLL bypass
  // 2) select the crystal value and oscillator source
  SYSCTL_RCC_R = (SYSCTL_RCC_R &~0x000007C0)   // clear XTAL field, bits 10-6
                 + 0x00000540;   // 10101, configure for 16 MHz crystal
  SYSCTL_RCC2_R &= ~0x00000070;  // configure for main oscillator source
  // 3) activate PLL by clearing PWRDN
  SYSCTL_RCC2_R &= ~0x00002000;
  // 4) set the desired system divider
  SYSCTL_RCC2_R |= 0x40000000;   // use 400 MHz PLL
  SYSCTL_RCC2_R = (SYSCTL_RCC2_R&~ 0x1FC00000)  // clear system clock divider
                  + (4<<22);      // configure for 80 MHz clock
  // 5) wait for the PLL to lock by polling PLLLRIS
  while((SYSCTL_RIS_R&0x00000040)==0){};  // wait for PLLRIS bit
  // 6) enable use of PLL by clearing BYPASS
  SYSCTL_RCC2_R &= ~0x00000800;
}

void ADC0_InitSWTriggerSeq3_Ch9(void){ volatile unsigned long delay;
  SYSCTL_RCGC2_R |= 0x00000010;   // 1) activate clock for Port E
  delay = SYSCTL_RCGC2_R;         //    allow time for clock to stabilize
  GPIO_PORTE_DIR_R &= ~0x04;      // 2) make PE4 input
  GPIO_PORTE_AFSEL_R |= 0x04;     // 3) enable alternate function on PE2
  GPIO_PORTE_DEN_R &= ~0x04;      // 4) disable digital I/O on PE2
  GPIO_PORTE_AMSEL_R |= 0x04;     // 5) enable analog function on PE2
  SYSCTL_RCGC0_R |= 0x00010000;   // 6) activate ADC0
  delay = SYSCTL_RCGC2_R;
  SYSCTL_RCGC0_R &= ~0x00000300;  // 7) configure for 125K
  ADC0_SSPRI_R = 0x0123;          // 8) Sequencer 3 is highest priority
  ADC0_ACTSS_R &= ~0x0008;        // 9) disable sample sequencer 3
  ADC0_EMUX_R &= ~0xF000;         // 10) seq3 is software trigger
  ADC0_SSMUX3_R &= ~0x000F;       // 11) clear SS3 field
  ADC0_SSMUX3_R += 9;             //    set channel Ain9 (PE4)
  ADC0_SSCTL3_R = 0x0006;         // 12) no TS0 D0, yes IE0 END0
  ADC0_ACTSS_R |= 0x0008;         // 13) enable sample sequencer 3
}

unsigned long ADC0_InSeq3(void){  unsigned long result;
  ADC0_PSSI_R = 0x0008;            // 1) initiate SS3
  while((ADC0_RIS_R&0x08)==0){};   // 2) wait for conversion done
  result = ADC0_SSFIFO3_R&0xFFF;   // 3) read result
  ADC0_ISC_R = 0x0008;             // 4) acknowledge completion
  return result;
}

void UART_Init(void){            // should be called only once
  SYSCTL_RCGC1_R |= 0x00000002;  // activate UART1
  SYSCTL_RCGC2_R |= 0x00000004;  // activate port C
  UART1_CTL_R &= ~0x00000001;    // disable UART
  UART1_IBRD_R = 43;     // IBRD = int(80,000,000/(16*115,200)) = int(43.40278)
  UART1_FBRD_R = 26;     // FBRD = round(0.40278 * 64) = 26
  UART1_LCRH_R = 0x00000070;  // 8 bit, no parity bits, one stop, FIFOs
  UART1_CTL_R |= 0x00000001;     // enable UART
  GPIO_PORTC_AFSEL_R |= 0x30;    // enable alt funct on PC5-4
  GPIO_PORTC_DEN_R |= 0x30;      // configure PC5-4 as UART1
  GPIO_PORTC_PCTL_R = (GPIO_PORTC_PCTL_R&0xFF00FFFF)+0x00220000;
  GPIO_PORTC_AMSEL_R &= ~0x30;   // disable analog on PC5-4
}

void UART_OutChar(unsigned int data){
  while((UART1_FR_R&0x0020) != 0);      // wait until TXFF is 0
  UART1_DR_R = data;
}

void OutVolt(unsigned long n){  // each integer means 0.01V
  UART_OutChar(0x30�+n/100);      // digit to the left of the decimal
  n = n%100;                     // 0 to 99
  UART_OutChar('.');             // decimal point
  UART_OutChar(0x30�+n/10);       // tenths digit
  n = n%10;                      // 0 to 9
  UART_OutChar(0x30�+n);          // hundredths digit
  UART_OutChar('V');}            // units

int main(void){
	PLL_Init(); //Set up system clock

	ADC0_InitSWTriggerSeq3_Ch9(); // Initialize ADC

	UART_Init(); // Initialize UART


while(1){
	ADCvalue= ADC0_InSeq3(); //Store ADC conversion into ADCvalue
	Voltage= ADCvalue*3.3/4096; //Convert to voltage
	UART_OutChar(ADCvalue);
	//OutVolt(Voltage);

}
}