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PIC16F877A interface with shift register 74HC595 and led

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cly_1018

New Member
i'm using 16 led and connect with shift register 74HC595 & PIC16F877A for hardware part~

how do i write my software program part using c++ code that can compile in MPLAB software to display some pattern such as moving forward or backward and lighting up the led?

thanks~
 

3v0

Coop Build Coordinator
Forum Supporter
It is not too complex. Read the 74HC595 data sheet to start. Datasheets from some vendors are better then others. There are a lot of vendors making the 595. If you still have questions come back and ask them but don't expect us to do your homework.

You said C++ which compiler are you using ? Have you used it before ?
 

cly_1018

New Member
i have complete my source code but after program to pic..the led just will light up but can't show the pattern~

do i need to include any 595 source code in my program??

i'm using MPLAB to compile it~
 

cly_1018

New Member
//include file
#include <pic.h>

//16F877A configuration
__CONFIG(0x3f71);

#define PORTDIT(adr, bit) ((unsigned)(&adr)*8+(bit))

static bit LED0 @ PORTDIT(PORTD, 0);
static bit LED1 @ PORTDIT(PORTD, 1);
static bit LED2 @ PORTDIT(PORTD, 2);
static bit LED3 @ PORTDIT(PORTD, 3);
static bit LED4 @ PORTDIT(PORTD, 4);
static bit LED5 @ PORTDIT(PORTD, 5);
static bit LED6 @ PORTDIT(PORTD, 6);
static bit LED7 @ PORTDIT(PORTD, 7);
static bit LED8 @ PORTDIT(PORTD, 8);
static bit LED9 @ PORTDIT(PORTD, 9);
static bit LED10 @ PORTDIT(PORTD, 10);
static bit LED11 @ PORTDIT(PORTD, 11);
static bit LED12 @ PORTDIT(PORTD, 12);
static bit LED13 @ PORTDIT(PORTD, 13);
static bit LED14 @ PORTDIT(PORTD, 14);
static bit LED15 @ PORTDIT(PORTD, 15);

unsigned int i; //for loop pause
unsigned int c; //for loop event loop

//pause functions
void pause_1();
void pause_2();

//main function
void main(void)
{

TRISD = 0x00;
PORTD = 0b00000000;

while(1)
{

for(c=0; c<10; c++)
{


//forward
LED0 = 1;
pause_1();

LED0 = 0;
LED1 = 1;
pause_1();

LED1 = 0;
LED2 = 1;
pause_1();

LED2 = 0;
LED3 = 1;
pause_1();

LED3 = 0;
LED4 = 1;
pause_1();

LED4 = 0;
LED5 = 1;
pause_1();

LED5 = 0;
LED6 = 1;
pause_1();

LED6 = 0;
LED7 = 1;
pause_1();

LED7 = 0;
LED8 = 1;
pause_1();

LED8 = 0;
LED9 = 1;
pause_1();

LED9 = 0;
LED10 = 1;
pause_1();

LED10 = 0;
LED11 = 1;
pause_1();

LED11 = 0;
LED12 = 1;
pause_1();

LED12 = 0;
LED13 = 1;
pause_1();

LED13 = 0;
LED14 = 1;
pause_1();

LED14 = 0;
LED15 = 1;
pause_1();

LED15 = 0;


//reverse
LED14 = 1;
pause_1();

LED14 = 0;
LED13 = 1;
pause_1();

LED13 = 0;
LED12 = 1;
pause_1();

LED12 = 0;
LED11 = 1;
pause_1();

LED11 = 0;
LED10 = 1;
pause_1();

LED10 = 0;
LED9 = 1;
pause_1();

LED9 = 0;
LED8 = 1;
pause_1();

LED8 = 0;
LED7 = 1;
pause_1();

LED7 = 0;
LED6 = 1;
pause_1();

LED6 = 0;
LED5 = 1;
pause_1();

LED5 = 0;
LED4 = 1;
pause_1();

LED4 = 0;
LED3 = 1;
pause_1();

LED3 = 0;
LED2 = 1;
pause_1();

LED2 = 0;
LED1 = 1;
pause_1();

LED1 = 0;
LED0 = 1;
pause_1();

};

//re-initalize PORTD
PORTD = 0b00000000;

for(c=0; c<10; c++)
{

PORTD = 0b10101010;
pause_2();

PORTD = 0b01010101;
pause_2();

};

for(c=0; c<10; c++)
{

PORTD = 0b11110000;
pause_2();

PORTD = 0b00001111;
pause_2();

};

for(c=0; c<10; c++)
{

PORTD = 0b11001100;
pause_2();

PORTD = 0b00110011;
pause_2();

};

for(c=0; c<10; c++)
{

PORTD = 0b10000001;
pause_1();

PORTD = 0b01000010;
pause_1();

PORTD = 0b00100100;
pause_1();

PORTD = 0b00011000;
pause_1();

PORTD = 0b00100100;
pause_1();

PORTD = 0b01000010;
pause_1();

};

}

}

void pause_1()
{

for(i=0; i<4000; i++);
for(i=0; i<4000; i++);

};

void pause_2()
{

for(i=0; i<4000; i++);
for(i=0; i<4000; i++);
for(i=0; i<4000; i++);
for(i=0; i<4000; i++);
for(i=0; i<4000; i++);
for(i=0; i<4000; i++);

};
 

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