It uses a common cathode type Seven Segment in which common point is supply and all the pins are provided with positive voltage to glow.
Button is with positive logic, means it will be considered on when it will provide input pin a high value.
A function SevenSegment is used to display numbers on this seven Segment. Port B from 1 to 7 is used for seven segment. Following is the output code for seven segment.
// ***** 0. Documentation Section *****
// SevenSegment.c
// Runs on LM4F120/TM4C123
// Use programming structures in C Run on a Seven Segment and Button
// Name: Counter
// Descrption: As you press button, it will count and show numbers 0-9
// Date: Feb 11, 2016
// Student: Muhammad Awais 2012-EE-506
// Class: UTAustinX: UT.6.03x Embedded Systems - Shape the World
// ***** 1. Pre-processor Directives Section *****
#include "tm4c123gh6pm.h"
//Bit specfic adressing for PE0 and PE1
//base adress of PORTE is 0x40024000
#define SW_PE0 (*((volatile unsigned long *)0x40024004))
// ***** 2. Global Declarations Section *****
// FUNCTION PROTOTYPES: Each subroutine defined
void PORTE_Init(void);
void SevenSeg_Init(void);
void clear7Seg(void);
void SevenSegment(int data);
void Delay1ms(unsigned long msec);
// ***** 3. Subroutines Section *****
//GPIO_PORTE_DATA_R
//GPIO_PORTB_DATA_R
// PE0 connected to positive logic momentary switch using 10k ohm pull down resistor
// PB1-PB7 connected to Common Anode Seven Segment
int main(void){
//**********************************************************************
// The following version tests input on PE0 and output on PE1
//**********************************************************************
int count=0;
PORTE_Init(); // Initlizes PORTE for switch
SevenSeg_Init(); // Initlizes PORTB for Seven Segment
SevenSegment(0); // Seven Segment is showing 0 on reset
while(1) //Infinte loop
{
/*
For Simple Counter Without Button
for(count;count<=9;count++)
{
SevenSegment(count);
Delay1ms(1000);
clear7Seg();
}
*/
if (count>9) //When count=9 it makes it zero
{
count=0;
SevenSegment(count);
}
if(SW_PE0==0x01) //If switch is presses
{
count=count+1; //incremetn counter
clear7Seg(); //Clears seven segment to write new data
SevenSegment(count); //Writes number on Seven Segment
Delay1ms(100); //Dealy for button debouncing and other factors
}
}
}
/*
Descrption: Initilizes PE0==>Input
Input: None
Output: None
*/
void PORTE_Init(void)
{
volatile unsigned long delay;
SYSCTL_RCGC2_R |= 0x00000010; // 1) E clock
delay = SYSCTL_RCGC2_R; // delay to allow clock to stabilize
GPIO_PORTE_AMSEL_R &= 0x00; // 2) disable analog function
GPIO_PORTE_PCTL_R &= 0x00000000; // 3) GPIO clear bit PCTL
GPIO_PORTE_DIR_R &= ~0x01; // 4.1) PE0 input,
GPIO_PORTE_AFSEL_R &= 0x00; // 5) no alternate function
GPIO_PORTE_DEN_R |= 0x01; // 6) enable digital pins PE4-PE1
}
/*
Descrption: Initilizes PB1 to PB7 as output
Input: None
Output: None
*/
void SevenSeg_Init(void)
{
volatile unsigned long delay;
SYSCTL_RCGC2_R |= 0x00000002; // 1) B clock
delay = SYSCTL_RCGC2_R; // delay to allow clock to stabilize
GPIO_PORTB_AMSEL_R &= 0x00; // 2) disable analog function
GPIO_PORTB_PCTL_R &= 0x00000000; // 3) GPIO clear bit PCTL
GPIO_PORTB_DIR_R |= 0xFF; // 4) PB output
GPIO_PORTB_AFSEL_R &= 0x00; // 5) no alternate function
GPIO_PORTB_DEN_R |= 0xFF; // 6) enable digital AT PB
}
/*
Descrption: Clears all 1-7 pins of PortB
Input: None
Output: None
*/
void clear7Seg()
{
GPIO_PORTB_DATA_R=0xff;
}
/*
Descrption: All the pins who will show number on Seven Segment will be zero
It is for common anode type, to make it for common cathode add ~ before all cases
Input: Number to be printed on Seven Segment
Output: None
*/
void SevenSegment(int data){
switch(data)
{
case 0: GPIO_PORTB_DATA_R=0x11 ;
break;
case 1: GPIO_PORTB_DATA_R=0x7D;
break;
case 2: GPIO_PORTB_DATA_R=0x89;
break;
case 3: GPIO_PORTB_DATA_R=0x29;
break;
case 4: GPIO_PORTB_DATA_R=0x65;
break;
case 5: GPIO_PORTB_DATA_R=0x23;
break;
case 6: GPIO_PORTB_DATA_R=0x03;
break;
case 7: GPIO_PORTB_DATA_R=0x79;
break;
case 8: GPIO_PORTB_DATA_R=0x01;
break;
case 9: GPIO_PORTB_DATA_R=0x21;
break;
}
}
/*
Descrption: Uses time of a instruction to delay time
Almost 1ms for each cycle
Input: Number of ms to delay
Output: None
*/
void Delay1ms(unsigned long msec){
// write this function
unsigned long i;
while(msec > 0){
i = 13333; // this number means 1ms
while(i > 0){
i = i - 1;
}
msec = msec - 1; // decrements every 1 ms
}
}
A seven Segment code written in Energia:
Energia is a software that is used for lauch pad to write arduino like code. Here is a code for Seven Segment in Energia.\
/*
Seven segment display
Muhammad Awais fb/awais12506
Hardware Required:
* LaunchPad with an LED
*Seven segment
*Connecting wires
.
*/
// most launchpads have a red LED
int A=A2;
int B=A3;
int C=A4;
int D=A1;
int E=A0;
int FI=A5;
int G=7;
//see pins_energia.h for more LED definitions
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(A, OUTPUT);
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(FI,OUTPUT);
pinMode(G, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
setOff();
sendData(9);
for(int i=0;i<10;i++)
{
sendData(i);
delay(1000);
setOff();
}
}
void sendData(int num)
{
switch (num)
{
case 1:
digitalWrite(FI,LOW);
digitalWrite(E, LOW);
break;
case 2:
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(G, LOW);
digitalWrite(E, LOW);
digitalWrite(D, LOW);
break;
case 3:
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(G, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
break;
case 4:
digitalWrite(FI, LOW);
digitalWrite(G, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
break;
case 5:
digitalWrite(A, LOW);
digitalWrite(FI, LOW);
digitalWrite(G, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
break;
case 6:
digitalWrite(A, LOW);
digitalWrite(FI, LOW);
digitalWrite(G, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
break;
case 7:
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
break;
case 8:
digitalWrite(A, 0);
digitalWrite(B, 0);
digitalWrite(C, 0);
digitalWrite(D, 0);
digitalWrite(E, 0);
digitalWrite(FI,0);
digitalWrite(G, 0);
case 9:
digitalWrite(A, LOW);
// digitalWrite(B, 0);
//digitalWrite(C, 0);
//digitalWrite(FI,0);
//digitalWrite(G, 0);
case 0:
digitalWrite(A, 0);
digitalWrite(B, 0);
digitalWrite(C, 0);
digitalWrite(D, 0);
digitalWrite(E, 0);
digitalWrite(FI,0);
}
}
void setOff()
{
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(FI,HIGH);
digitalWrite(G, HIGH);
}
void setOn()
{
digitalWrite(A, 0);
digitalWrite(B, 0);
digitalWrite(C, 0);
digitalWrite(D, 0);
digitalWrite(E, 0);
digitalWrite(FI,0);
digitalWrite(G, 0);
}
Just to learn things, I have created this app wchich only speaks whatever you write in the text box.
