Multiple LEDs and using and input button Please anwswer parts a and b for proble
ID: 3743472 • Letter: M
Question
Multiple LEDs and using and input button
Please anwswer parts a and b for problem 1 below.
1. Modify the instructor’s C program:
a. Instead of using the multiply and divide functions to change pins/LED’s, use the << and >> functions. References: Deitel and Deitel “C, How to Program and https://en.wikipedia.org/wiki/Operators_in_C_and_C
b. Change the clock frequency in the program to 1 MHz and make the on/off time of each LED .1 seconds. This should make the rotation visibly faster. (Remember to change the _XTAL_FREQ value since this is used for the __delay_ms() function built into XC8)
Devices:
Low Pin Count board (16F1829 on board) and 44-Pin Demo Board are both on same backboard. (You only use the 16F1829 for this lab.)
PICKIT 3 programmer with USB cable
MPLAB X (I used v3.00 but a different version may be on lab computers))
Microchip XC8 C Compiler User Manual
PIC16F1829 Data Sheet
PICkit 3 User’s Guide
Low Pin Count Board User Guide
“C How to Program” Deitel, Pearson/Prentice-Hall (Any edition)
Internet Browser Search Engine for research (Google, Bing, etc)
/*
LEDs on for approximately 0.5 sec.
PIC: 16F1829 Enhanced Mid-Level
Compiler: XC8 v1.34
IDE: MPLABX v3.00 */
#include //Not required but this is the reference used by "C" for names and location on uC
#include //refers on HiTech C, Microchip purchased HiTech
#define _XTAL_FREQ 4000000 //Used by the XC8 delay_ms(x) macro
#define switch PORTAbits.RA2 // Can use RA2 instead of PORTAbit.RA2 to define pin attached to switch
//instead of saying PORTAbits.RA2 each time
//config bits for the PIC16F1829
#pragma config FOSC=INTOSC, WDTE=OFF, PWRTE=OFF, MCLRE=OFF, CP=OFF, CPD=OFF, BOREN=ON, CLKOUTEN=OFF, IESO=OFF, FCMEN=OFF
#pragma config WRT=OFF, PLLEN=OFF, STVREN=OFF, LVP=OFF
//Initialization subroutine
void initialize(void) {
ANSELC=0; //All pins of Port C are digital I/O
ANSA2=0; //switch pin, RA2, is digital IO
TRISA2 = 1; //switch is an input
TRISC = 0; //all pins of Port C are outputs
OSCCON = 0b01101000; // 4 MHz
}
unsigned char i1; //only need 4 bits to count to 16. unsigned character variable is 8 bits long
// Here is main(). There are many ways to do this 4-pin (LED) sequence
void main(void)
{
initialize();
i1=1; //Start the main program with the variable =1. Could have done this during its definition
while (1) //runs continuously until MCU is shut off
{ if (switch==1) //Button not pressed pin at 5V
{ i1=1; }
while (switch==1) //Button not pressed
{
PORTC=i1; //Note that writing to PORTC writes to LATC
__delay_ms(500);
i1=i1*2;
if (i1==16)
{ i1=1; }
}
if (switch==0) //Button pressed pin at ground
{ i1=8; }
while (switch==0) //Button pressed
{
PORTC=i1;
__delay_ms(500);
i1=i1/2;
if (i1==0)
{ i1=8; }
}
}
}
Explanation / Answer
------------------------------------------------CODE----------------------------------------------------
/*
LEDs on for approximately 0.5 sec.
PIC: 16F1829 Enhanced Mid-Level
Compiler: XC8 v1.34
IDE: MPLABX v3.00 */
#include //Not required but this is the reference used by "C" for names and location on uC
#include //refers on HiTech C, Microchip purchased HiTech
#define _XTAL_FREQ 1000000 //Used by the XC8 delay_ms(x) macro
#define switch PORTAbits.RA2 // Can use RA2 instead of PORTAbit.RA2 to define pin attached to switch
//instead of saying PORTAbits.RA2 each time
//config bits for the PIC16F1829
#pragma config FOSC=INTOSC, WDTE=OFF, PWRTE=OFF, MCLRE=OFF, CP=OFF, CPD=OFF, BOREN=ON, CLKOUTEN=OFF, IESO=OFF, FCMEN=OFF
#pragma config WRT=OFF, PLLEN=OFF, STVREN=OFF, LVP=OFF
//Initialization subroutine
void initialize(void) {
ANSELC=0; //All pins of Port C are digital I/O
ANSA2=0; //switch pin, RA2, is digital IO
TRISA2 = 1; //switch is an input
TRISC = 0; //all pins of Port C are outputs
OSCCON = 0b01001000; // 1 MHz
}
unsigned char i1; //only need 4 bits to count to 16. unsigned character variable is 8 bits long
// Here is main(). There are many ways to do this 4-pin (LED) sequence
void main(void)
{
initialize();
i1=1; //Start the main program with the variable =1. Could have done this during its definition
while (1) //runs continuously until MCU is shut off
{ if (switch==1) //Button not pressed pin at 5V
{ i1=1; }
while (switch==1) //Button not pressed
{
PORTC=i1; //Note that writing to PORTC writes to LATC
__delay_ms(500);
i1=i1<<2;
if (i1==16)
{ i1=1; }
}
if (switch==0) //Button pressed pin at ground
{ i1=8; }
while (switch==0) //Button pressed
{
PORTC=i1;
__delay_ms(500);
i1=i1>>2;
if (i1==0)
{ i1=8; }
}
}
}
--------------------------------------------CODE ENDS--------------------------------------------------
Good Luck! Thanks for the question!
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