parthiv2eng
Member level 2
Here's code and circuit dia...But it won't work..please help..!!
Code:
#include<htc.h> //include MCU head file
__CONFIG(OSC_XT & WDT_OFF & CP_OFF);
#ifndef _XTAL_FREQ
// Unless already defined assume 4MHz system frequency
// This definition is required to calibrate __delay_us() and __delay_ms()
#define _XTAL_FREQ 4000000
#endif
#define PLAY 0x35
#define STOP 0x36
#define PAUSE 0x30
#define PREVTRACK 0x21
#define NEXTTRACK 0x20
#define REVERSE 0x32
#define FASTFORWARD 0x34
#define SHUFFLE 0x1C
#define REPEAT 0x1D
#define VOLUMEUP 0x14
#define VOLUMEDOWN 0x15
#define MUTE 0x0D
#define PROGRAM 0x24
#define STANDBY 0x0C
#define DIM 0x10
#define DISC 0x2D
#define SCAN 0x2B
#define SOURCE 0x0E
#define PARITY 0x0A
#define AORB 0x3B
#define TIME 0x29
#define FAST 0x2F
#define UNDEFINE 0xFF
#define ADDRESS 0x14
#define FALSE 0
#define TRUE 1
void send_code(unsigned char);
void transmit(unsigned char);
typedef struct
{
unsigned char bit_mask; //used to create a serial data stream
unsigned int k;
unsigned int count;
unsigned char key;
unsigned char row;
} REMOTE;
volatile REMOTE remote;
//---------------------------------------------------
//main program
void main()
{
while(1) //circle work
{
TRISA=0x00; //PORTA OUTPUT
TRISB=0xFF; //PORTB INPUT
TRISC=0x00; //PORTC OUTPUT
RA3 = 1;
remote.key = 0;
for( remote.row = 0b00000001; remote.row < 0b01000000; remote.row<<=1)
{
{
RC0 = 0;
RC1 = (~remote.row)>>1;
RC2 = (~remote.row)>>2;
RC3 = (~remote.row)>>3;
RC4 = (~remote.row)>>4;
RC5 = (~remote.row)>>5;
RC6 = 1;
RC7 = 1;
}
// read colums - break when key press detected
if(RB0)break; remote.key++;
if(RB1 )break; remote.key++;
if(RB2)break; remote.key++;
if(RB3)break; remote.key++;
if(RB4)break; remote.key++;
if(RB5)break; remote.key++;
if(RB6)break; remote.key++;
if(RB7)break; remote.key++;
}
RC1 = 1;
RC2 = 1;
RC3 = 1;
RC4 = 1;
RC5 = 1;
switch(remote.key)
{
case 0: send_code(UNDEFINE); break;
case 1: send_code(STANDBY); break;
case 2: send_code(UNDEFINE); break;
case 3: send_code(UNDEFINE); break;
case 4: send_code(DISC); break;
case 5: send_code(UNDEFINE); break;
case 6: send_code(UNDEFINE); break;
case 7: send_code(AORB); break;
case 8: send_code(UNDEFINE); break;
case 9: send_code(1); break;
case 10: send_code(4); break;
case 11: send_code(7); break;
case 12: send_code(UNDEFINE); break;
case 13: send_code(SCAN); break;
case 14: send_code(FAST); break;
case 15: send_code(SHUFFLE); break;
case 16: send_code(UNDEFINE); break;
case 17: send_code(2); break;
case 18: send_code(5); break;
case 19: send_code(8); break;
case 20: send_code(0); break;
case 21: send_code(PROGRAM); break;
case 22: send_code(REVERSE); break;
case 23: send_code(PREVTRACK); break;
case 24: send_code(UNDEFINE); break;
case 25: send_code(3); break;
case 26: send_code(6); break;
case 27: send_code(9); break;
case 28: send_code(UNDEFINE); break;
case 29: send_code(TIME); break;
case 30: send_code(FASTFORWARD); break;
case 31: send_code(NEXTTRACK); break;
case 32: send_code(REPEAT); break;
case 33: send_code(PAUSE); break;
case 34: send_code(STOP); break;
case 35: send_code(UNDEFINE); break;
case 36: send_code(UNDEFINE); break;
case 37: send_code(UNDEFINE); break;
case 38: send_code(UNDEFINE); break;
case 39: send_code(UNDEFINE); break;
case 40: send_code(PLAY); break;
case 41: send_code(UNDEFINE); break;
case 42: send_code(UNDEFINE); break;
case 43: send_code(UNDEFINE); break;
case 44: send_code(UNDEFINE); break;
case 45: send_code(UNDEFINE); break;
case 46: send_code(UNDEFINE); break;
case 47: send_code(UNDEFINE); break;
default: break;
}
}
}
void send_code(unsigned char button)
{
//BUTTON DOWN
remote.bit_mask = 0x10;
// Send two start bits
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
// Send a toggle bit - 1
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
// Send address - 5 bits
for (remote.k = 0; remote.k < 5; remote.k++)
{
if ((ADDRESS & remote.bit_mask) > 0)
{
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
}
else
{
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
}
// Shift remote.bit_mask right 1 bit 0x10->0x08->0x04->0x02->0x01
remote.bit_mask = remote.bit_mask >> 1;
}
//Send button command
remote.bit_mask = 0x20;
// 6 data bits, MSB first
for (remote.k = 0; remote.k < 6; remote.k++)
{
if ((button & remote.bit_mask) > 0)
{
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
}
else
{
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
}
// Shift remote.bit_mask right 1 bit 0x20->0x10->0x08->0x04->0x02->0x01
remote.bit_mask = remote.bit_mask >> 1;
}
//BUTTON UP
remote.bit_mask = 0x10;
// Send two start bits
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
// Send a toggle bit - 0
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
// Send address - 5 bits
for (remote.k = 0; remote.k < 5; remote.k++)
{
// determine whether to put a 0 or 1 on to the DATA pin
if ((ADDRESS & remote.bit_mask) > 0)
{
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
}
else
{
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
}
// Shift remote.bit_mask right 1 bit 0x10->0x08->0x04->0x02->0x01
remote.bit_mask = remote.bit_mask >> 1;
}
//Send button command
remote.bit_mask = 0x20;
// 6 data bits, MSB first
for (remote.k = 0; remote.k < 6; remote.k++)
{
// determine whether to put a 0 or 1 on to the DATA pin
if ((button & remote.bit_mask) > 0)
{
RA3 = FALSE;
__delay_us(889);
RA3 = TRUE;
__delay_us(889);
}
else
{
RA3 = TRUE;
__delay_us(889);
RA3 = FALSE;
__delay_us(889);
}
// Shift remote.bit_mask right 1 bit 0x20->0x10->0x08->0x04->0x02->0x01
remote.bit_mask = remote.bit_mask >> 1;
}
}
Last edited:
