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SevenSegment2.c
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SevenSegment2.c
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//***************************************************************************************
// Name: SevenSegment2.c
//
// Author: Sergio PL
// http://github.com/sphanlung/ http://idielectronica.blogspot.com/
//
// Device: LM4F120/TM4C123, Tiva C Launchpad
//
// Description: This program uses the Tiva C Launchpad to make a button-press counter
// with the number shown in a common-anode 4-digit 7-segment display.
// For this implementation we used the 5641BH display. A circuit diagram can be found
// in the blog listed above.
//***************************************************************************************
#include "tm4c123gh6pm.h"
//Create definitions for Port B registers
#define GPIO_PORTB_DATA_R (*((volatile unsigned long *)0x400053FC))
#define GPIO_PORTB_DIR_R (*((volatile unsigned long *)0x40005400))
#define GPIO_PORTB_PUR_R (*((volatile unsigned long *)0x40005510))
#define GPIO_PORTB_DEN_R (*((volatile unsigned long *)0x4000551C))
#define GPIO_PORTB_CR_R (*((volatile unsigned long *)0x40005524))
#define GPIO_PORTB_AMSEL_R (*((volatile unsigned long *)0x40005528))
#define GPIO_PORTB_PCTL_R (*((volatile unsigned long *)0x4000552C))
#define SYSCTL_RCGC2_R (*((volatile unsigned long *)0x400FE108))
//Create definitions for Port E registers
#define GPIO_PORTE_DATA_R (*((volatile unsigned long *)0x400243FC))
#define GPIO_PORTE_DIR_R (*((volatile unsigned long *)0x40024400))
#define GPIO_PORTE_PUR_R (*((volatile unsigned long *)0x40024510))
#define GPIO_PORTE_DEN_R (*((volatile unsigned long *)0x4002451C))
#define GPIO_PORTE_CR_R (*((volatile unsigned long *)0x40024524))
#define GPIO_PORTE_AMSEL_R (*((volatile unsigned long *)0x40024528))
#define GPIO_PORTE_AFSEL_R (*((volatile unsigned long *)0x40024420))
#define GPIO_PORTE_PCTL_R (*((volatile unsigned long *)0x4002452C))
//Create definitions for Port F registers
#define GPIO_PORTF_DATA_R (*((volatile unsigned long *)0x400253FC))
#define GPIO_PORTF_DIR_R (*((volatile unsigned long *)0x40025400))
#define GPIO_PORTF_AFSEL_R (*((volatile unsigned long *)0x40025420))
#define GPIO_PORTF_PUR_R (*((volatile unsigned long *)0x40025510))
#define GPIO_PORTF_DEN_R (*((volatile unsigned long *)0x4002551C))
#define GPIO_PORTF_LOCK_R (*((volatile unsigned long *)0x40025520))
#define GPIO_PORTF_CR_R (*((volatile unsigned long *)0x40025524))
#define GPIO_PORTF_AMSEL_R (*((volatile unsigned long *)0x40025528))
#define GPIO_PORTF_PCTL_R (*((volatile unsigned long *)0x4002552C))
//Global variables
int numbers[10] = {0x40,0x79,0x24,0x30,0x19, // Each value turns on bits needed
0x12,0x02,0x78,0x00,0x10}; // to show numbers in display
int digit1, digit2, digit3, digit4; // Number to be displayed in each digit
unsigned long SW2; // On-board push button
unsigned long count=0; // Counter for button presses
int before=1; // States if button was pressed in previous
// loop cycle to enable counter.
// Function Prototypes
void PortB_Init(void);
void PortE_Init(void);
void PortF_Init(void);
void Delay2(void);
void Display(int digit, int number);
void NumSplit(int counted);
// Subroutines Section
int main(void){
PortB_Init(); // Initialize microcontroller ports
PortE_Init();
PortF_Init();
while(1){
SW2 = GPIO_PORTF_DATA_R&0x01; // Defines on-board button as SW2
if(SW2 == 0x00 && before == 0){ // If SW2 is pressed and wasn't pressed in
if(count <= 9998){ // previous loop cycle. Prevents counter from
count++; // increasing when button is held down.
before = 1;
}
else{ // Reset counter at 9999
count = 0;
}
}
if(SW2 == 0x01){ // If button isn't pressed
before = 0;
}
NumSplit(count); // Split value in counter into 4 numbers
Display(1,digit1); // Display number for lowest digit
Display(2,digit2);
Display(4,digit3);
Display(8,digit4);
}
}
// Subroutine to initialize ports B, E and F
void PortB_Init(void){
SYSCTL_RCGC2_R |= 0x00000002; // Port B clock initialized
GPIO_PORTB_CR_R = 0x7F; // Allow changes to PB6-PB0
GPIO_PORTB_AMSEL_R = 0x00; // Disable analog function
GPIO_PORTB_PCTL_R = 0x00000000; // GPIO clear bit PCTL
GPIO_PORTB_DIR_R = 0x7F; // Set PB6-PB0 outputs
GPIO_PORTB_PUR_R = 0x00; // Enable pullup resistors on PB4,PF0
GPIO_PORTB_DEN_R = 0x7F; // 7) Enable digital pins PB6-PB0
}
void PortE_Init(void){
SYSCTL_RCGC2_R |= 0x00000010; // Port E clock initialized
GPIO_PORTE_CR_R = 0x0F; // Allow changes to PE4-0
GPIO_PORTE_AMSEL_R = 0x00; // Disable analog function
GPIO_PORTE_PCTL_R = 0x00000000; // GPIO clear bit PCTL
GPIO_PORTE_DIR_R = 0x0F; // PE3-PE0 output
GPIO_PORTE_PUR_R = 0x00; // Disable pullup resistors
GPIO_PORTE_DEN_R = 0x0F; // Enable digital pins PE3-PE0
}
void PortF_Init(void){
SYSCTL_RCGC2_R |= 0x00000020; // Port F clock initialized
GPIO_PORTF_LOCK_R = 0x4C4F434B; // Unlock PortF
GPIO_PORTF_CR_R = 0x1F; // Allow changes to PB4-PB0
GPIO_PORTF_AMSEL_R = 0x00; // Disable analog function
GPIO_PORTF_PCTL_R = 0x00000000; // GPIO clear bit PCTL
GPIO_PORTF_DIR_R = 0x0E; // PF4,PF0 input
GPIO_PORTF_AFSEL_R = 0x00; // No alternate function
GPIO_PORTF_PUR_R = 0x11; // Enable pullup resistors on PF4,PF0
GPIO_PORTF_DEN_R = 0x1F; // Enable digital pins PF4-PF0
}
// Creates 0.1ms delay
void Delay2(void){
unsigned long volatile time;
time = 727240*200/91000; // 0.1 ms
while(time){
time--;
}
}
// Takes digit and number for LED display
void Display(int digit, int number){
GPIO_PORTB_DATA_R = 0x00; // Turns off LEDs
GPIO_PORTE_DATA_R = digit; // Selects digit
GPIO_PORTB_DATA_R = numbers[number]; // Turns on number in selected digit
Delay2(); // Wait 0.1 ms
}
// Splits number in counter into 4 separate numbers for each digit
void NumSplit(int counted){
digit1 = counted%10; //Copies value in counter, divides it by 10 and then keeps remainder
counted /= 10; //Dividing value in counter by 10 shifts it by one decimal
digit2 = counted%10;
counted /= 10;
digit3 = counted%10;
counted /= 10;
digit4 = counted%10;
counted /=10;
}