Music Production

Monday, July 25, 2016

PIC Code Dumping Ground

Sorry this blog has become mostly a dumping ground for PIC code.

Sunday, April 3, 2016

This code makes digital noise using a PIC microcontroller (12f683).

Three signals are generated: Random noise on GP0, random triggers GP1, and random gates on GP2.

/*
* File:   Noise Generator 2 Routine.c
* Author: Hans Mikelson
*
* Created on March 17, 2016, 1 PM
*/

#if defined(__XC)
    #include <xc.h>         /* XC8 General Include File */
#elif defined(HI_TECH_C)
    #include <htc.h>        /* HiTech General Include File */
#endif

#include <stdint.h>        /* For uint8_t definition */
#include <stdbool.h>       /* For true/false definition */
#include <stdlib.h>     /*rand()*/

#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO
#define _XTAL_FREQ 4000000
uint8_t sGPIO;
int gi,gi1,gr1,gr2,gr3,gi3,gr0,gr4;

void init()
{
    //Configure GPIO Port
    ANSEL = 0b00000000; //Configure all GPIO pins as digital
    TRISIO = 0b11001100; //Set GP# 1=inputs and 0=outputs
    OPTION_REGbits.nGPPU = 0;
    WPU = 0b00000100;     //Enable weak pullups=1
    //Configuer AD Convertor
    ADCON0 = 0x00;        //AD disabled
    ADRESH = 0x00;        //Init the AD Register
    //Configure Comparator
    CMCON0 = 0xFF;   // Comparator is turned off
    CMCON1 = 0x00;   // Comparator is turned off
    //Interrupt configuration
    //INTCON = 0x00;   //Disable all interrupts
    INTCONbits.INTF = 0;       // External interrupt on GP2 only
    OPTION_REGbits.INTEDG = 0; // 1=rising edge, 0=falling
    INTCONbits.INTE = 1;       // Enable external interrupt
    INTCONbits.GIE = 1;        // Global interrupt enable
}

void vdelay(int n)
{
    int i;
    for (i=0;i<=n;i++)
    {
     __delay_us(100);
    }
}

void scan_eyes(int n, int m, uint8_t led1, uint8_t led2) // PWM sweep high f to low f
{
int i,j,k;
int i1,i2,i3,pw1,pw2;
uint8_t sGPIO;

i1=1; i2=-1; pw1=0; pw2=n;
sGPIO = GPIO;
for (k=0;k<m;k++)
{
for (j=0;j<n;j++)
   {
    for (i=0;i<n;i++)
     {
      if (i>pw1)
       {
        sGPIO = sGPIO & ~led1;
       }
      else
       {
        sGPIO = sGPIO | led1;
       }
      if (i>pw2)
       {
        sGPIO = sGPIO & ~led2;
       }
      else
       {
        sGPIO = sGPIO | led2;
       }
      GPIO = sGPIO;
     }
    pw1 = pw1 + i1;
    pw2 = pw2 + i2;
   }
i3 = i1; i1 = i2, i2 = i3;
}
}

void noise0(uint8_t r3) // Pulse noise with different frequencies
{
int r1;
r1=rand() | 0b11111110;

sGPIO = GPIO;
//sGPIO = (sGPIO & 0b11111101);
sGPIO = (sGPIO | 0b00000001) & r1;
if (gr1<=0)
{
   sGPIO = (sGPIO & 0b11101111);
}
if (gr2<=0)
{
   gr0=(rand() & r3)+11;
   gr1=(rand() & r3)+11;
   gr2=gr1+gr0;
   gr3=10;
   gi3=-1;
   sGPIO = (sGPIO | 0b00010010);
}
gr2--;
gr1--;
if (gr3==0)
{
   gi3=0;
   sGPIO = (sGPIO & 0b11111101);
}
gr3+=gi3;
GPIO = sGPIO;
}

void noise1(int r3) // Pulse noise
{
int r1;
r1=rand() | 0b11111110;

sGPIO = GPIO;
sGPIO = (sGPIO | 0b00000001) & r1;
if (gr1<=0)
{
   sGPIO = (sGPIO & 0b11101111);
}
if (gr2<=0)
{
   gr0=(rand() & gr4)+11;
   gr1=(rand() & gr4)+11;
   gr2=gr1+gr0;
   gr3=10;
   gi3=-1;
   sGPIO = (sGPIO | 0b00010010);
}
gr2--;
gr1--;
if (gr3==0)
{
   gi3=0;
   sGPIO = (sGPIO & 0b11111101);
}
gr3+=gi3;
GPIO = sGPIO;
}

void main()
{
    uint8_t r, d=20, rp=3;

    init();
    gi=0;
    gi3=0; gr3=10;
    GPIO = 0b00000000;
    gr0=(rand() & 0b1111111111)+11;
    gr1=(rand() & 0b1111111111)+11;
    gr2=gr1+gr0;
    scan_eyes(d,2,2,1);
    while(1)
    {
     switch (gi)
      {
       case 0:
           noise0(1);
       break;

       case 1:
         noise1(rand());
       break;

       default:
       scan_eyes(d,2,1,2);
      }
    }
}

void interrupt tc_int (void)
{
if (INTCONbits.INTF==1)
{
   INTCONbits.INTF = 0;
   gi=(gi+1)%3;
   vdelay(100);
     switch (gi)
      {
       case 0:
         gi3=0; gr3=10;
         GPIO = 0b00000000;
         gr0=(rand() & 0b1111111111)+11;
         gr1=(rand() & 0b1111111111)+11;
         gr2=gr1+gr0;
       break;

       case 1:
         gi3=0; gr3=10;
         GPIO = 0b00000000;
         gr4 = rand();
         gr0=(rand() & gr4)+11;
         gr1=(rand() & gr4)+11;
         gr2=gr1+gr0;
       break;

       default:
         GPIO = 0b00000000;
      }
}
}

Saturday, March 26, 2016

Interrupt Generator and Curve Tracer

Just putting this code up so I can easily access it when I want to. The curve tracer is an example of using PWM, the second file is an example of using an external interrupt. This is for a 12f683 device. I am working on putting this code into my mini-modular synthesizer. I have a module that is based on the PIC12f683 that generates noise and random events.

/*
* File: CurveTracerMain.c
* Author: Hans Mikelson
*
* Created on March 17, 2016, 12:34 PM
*/

#if defined(__XC)
#include <xc.h> /* XC8 General Include File */
#elif defined(HI_TECH_C)
#include <htc.h> /* HiTech General Include File */
#endif

#include <stdint.h> /* For uint8_t definition */
#include <stdbool.h> /* For true/false definition */

#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO
#define _XTAL_FREQ 8000000
uint8_t sGPIO;
int gi;

void init()
{
//Configure GPIO Port
ANSEL = 0b00000000; //Configure all GPIO pins as digital
TRISIO = 0b11001100; //Set GP# 1=inputs and 0=outputs
OPTION_REGbits.nGPPU = 0;
WPU = 0b00100100; //Enable weak pullups=1
//Configuer AD Convertor
ADCON0 = 0x00; //AD disabled
ADRESH = 0x00; //Init the AD Register
//Configure Comparator
CMCON0 = 0xFF; // Comparator is turned off
CMCON1 = 0x00; // Comparator is turned off
//Interrupt configuration
INTCON = 0x00; //Disable all interrupts
//INTCONbits.INTF = 0; // External interrupt on GP2 only
//OPTION_REGbits.INTEDG = 0; // 1=rising edge, 0=falling
//INTCONbits.INTE = 1; // Enable external interrupt
//INTCONbits.GIE = 1; // Global interrupt enable
}

void vdelay(int n)
{
int i;
for (i=0;i<=n;i++)
{
__delay_us(100);
}
}

void main()
{
uint8_t r, d, rp=3, sPIR1, sCCP1CON, i=0, j=0, sCCPR1L, sGPIO; // ADC_result2;;

init();
gi=0;
GPIO = 0b00000000;
TRISIO = 0b11101100; //Disable IO2
PR2 = 0x0F;
CCP1CON = 0b00111100;
CCPR1L = 16; // 1,4,16
sPIR1 = PIR1 & 0b11111101; //Clear TMR2IF
PIR1 = sPIR1;
T2CON = 0b00000101;
while(1)
{
//Update PWM
if (PIR1bits.TMR2IF == 1)
{
i=(i+1)%0x0F;
TRISIO = 0b11101000;
CCPR1L = i;
}
if (i == 0x00)
{
j=(j+1)%4;
sGPIO = GPIO;
sGPIO = ((sGPIO & 0b11111100) | j);
GPIO = sGPIO;
}
}
}

* File: Interrupt Test Routine.c

* Author: Hans Mikelson

* Created on March 17, 2016, 1 PM

#if defined(__XC)

#include <xc.h> /* XC8 General Include File */

#elif defined(HI_TECH_C)

#include <htc.h> /* HiTech General Include File */

#endif

#include <stdint.h> /* For uint8_t definition */

#include <stdbool.h> /* For true/false definition */

#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO

#define _XTAL_FREQ 4000000

uint8_t sGPIO;

int gi;

void init()

{

//Configure GPIO Port

ANSEL = 0b00000000; //Configure all GPIO pins as digital

TRISIO = 0b11001100; //Set GP# 1=inputs and 0=outputs

OPTION_REGbits.nGPPU = 0;

WPU = 0b00100100; //Enable weak pullups=1

//Configuer AD Convertor

ADCON0 = 0x00; //AD disabled

ADRESH = 0x00; //Init the AD Register

//Configure Comparator

CMCON0 = 0xFF; // Comparator is turned off

CMCON1 = 0x00; // Comparator is turned off

//Interrupt configuration

//INTCON = 0x00; //Disable all interrupts

INTCONbits.INTF = 0; // External interrupt on GP2 only

OPTION_REGbits.INTEDG = 0; // 1=rising edge, 0=falling

INTCONbits.INTE = 1; // Enable external interrupt

INTCONbits.GIE = 1; // Global interrupt enable

}

void vdelay(int n)

{

int i;

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

{

__delay_us(100);

}

void scan_eyes(int n, int m, uint8_t led1, uint8_t led2) // PWM sweep high f to low f

{

int i,j,k;

int i1,i2,i3,pw1,pw2;

uint8_t sGPIO;

i1=1; i2=-1; pw1=0; pw2=n;

sGPIO = GPIO;

for (k=0;k<m;k++)

{

for (j=0;j<n;j++)

{

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

{

if (i>pw1)

{

sGPIO = sGPIO & ~led1;

}

else

{

sGPIO = sGPIO | led1;

}

if (i>pw2)

{

sGPIO = sGPIO & ~led2;

}

else

{

sGPIO = sGPIO | led2;

}

GPIO = sGPIO;

}

pw1 = pw1 + i1;

pw2 = pw2 + i2;

}

i3 = i1; i1 = i2, i2 = i3;

}

void main()

{

uint8_t r, d=200, rp=3;

init();

gi=0;

GPIO = 0b00000000;

while(1)

{

switch (gi)

{

case 0:

GPIO = 0b00000001;

break;

case 1:

GPIO = 0b00000010;

break;

case 2:

GPIO = 0b00000011;

break;

case 3:

GPIO = 0b00010000;

break;

case 4:

GPIO = 0b00010001;

break;

case 5:

GPIO = 0b00010010;

break;

case 6:

GPIO = 0b00010011;

break;

case 7:

GPIO = 0b00000000;

break;

default:

scan_eyes(d,2,1,2);

}

void interrupt tc_int (void)

{

if (INTCONbits.INTF==1)

{

INTCONbits.INTF = 0;

gi=(gi+1)%9;

vdelay(100);

}

Tuesday, March 31, 2015

Spider 2 w Noise

/*
* File: spider2main.c
* Author: hmikelson
*
* Created on March 24, 2015, 4:30 PM
*/

#if defined(__XC)
#include <xc.h> /* XC8 General Include File */
#elif defined(HI_TECH_C)
#include <htc.h> /* HiTech General Include File */
#endif

#include <stdint.h> /* For uint8_t definition */
#include <stdbool.h> /* For true/false definition */
#include <stdlib.h> /*rand()*/

#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO
#define _XTAL_FREQ 4000000
uint8_t sGPIO;

void init()
{
//Configure GPIO Port
ANSEL = 0b00000000; //Configure all GPIO pins as digital
TRISIO = 0b11001000; //Set GP3 as input and the rest as outputs
// GP0 = eye 1, GP2 = eye 2, GP5 = speaker, GP4 = piezo
OPTION_REGbits.nGPPU = 0;
WPU = 0b00000100; //Enable weak pullups on GP2
//Configuer AD Convertor
ADCON0 = 0x00; //AD disabled
ADRESH = 0x00; //Init the AD Register
//Configure Comparator
CMCON0 = 0xFF; // Comparator is turned off
CMCON1 = 0x00; // Comparator is turned off
//Interrupt configuration
INTCON = 0x00; //Disable all interrupts
}

void vdelay(int n)
{
int i;
for (i=0;i<=n;i++)
{
__delay_us(1);
}
}

void fade_eyes(int n) // PWM sweep high f to low f
{
int i;
{
for (i=0;i<n;i++)
{
GPIO = 0b11000101;
vdelay(i);
GPIO = 0b11000000;
vdelay(n-i);
}
for (i=0;i<n;i++)
{
GPIO = 0b11000101;
vdelay(n-i);
GPIO = 0b11000000;
vdelay(i);
}
}
}

void scan_eyes(int n) // PWM sweep high f to low f
{
int i,j,k;
int i1,i2,i3,pw1,pw2;
uint8_t sGPIO;

i1=1; i2=-1; pw1=0; pw2=n;
sGPIO = GPIO;
for (k=0;k<6;k++)
{
for (j=0;j<n;j++)
{
for (i=0;i<n;i++)
{
if (i>pw1)
{
sGPIO = sGPIO & 0b11111110;
}
else
{
sGPIO = sGPIO | 0b00000001;
}
if (i>pw2)
{
sGPIO = sGPIO & 0b11111011;
}
else
{
sGPIO = sGPIO | 0b00000100;
}
GPIO = sGPIO;
}
pw1 = pw1 + i1;
pw2 = pw2 + i2;
}
i3 = i1; i1 = i2, i2 = i3;
}
}

void dark_eyes(void) // PWM sweep high f to low f
{
GPIO = 0b11000000;
__delay_ms(2000);
}

void scream(int n) // PWM sweep high f to low f
{
int i,r,j;
{
for (j=0;j<n;j++)
{
for (i=0;i<j;i++)
{
r=rand()%8;
GPIO = 0b11100101;
vdelay(i+r);
GPIO = 0b11000000;
vdelay(n-i+r);
i = i+r;
}
}
}
}

void scream2(int n) // PWM sweep high f to low f
{
int i,r,j;
{
for (j=0;j<n;j++)
{
for (i=0;i<j;i++)
{
r=rand()%8;
GPIO = 0b11010101;
vdelay(i+r);
GPIO = 0b11000000;
vdelay(n-i+r);
i = i+r;
}
}
}
}

void scream3(int n) // PWM sweep high f to low f
{
int i,j,k,r;
int i1,i2,i3,pw1,pw2;
uint8_t sGPIO;

i1=1; i2=-1; pw1=0; pw2=n;
sGPIO = GPIO;
for (k=0;k<2;k++)
{
for (j=0;j<n;j++)
{
for (i=0;i<n;i++)
{
if (i>pw1)
{
sGPIO = sGPIO & 0b11011110;
}
else
{
sGPIO = sGPIO | 0b00100001;
}
if (i>pw2)
{
sGPIO = sGPIO & 0b11101011;
}
else
{
sGPIO = sGPIO | 0b00010100;
}
GPIO = sGPIO;
r=rand()%6;
vdelay(r);
}
pw1 = pw1 + i1;
pw2 = pw2 + i2;
}
i3 = i1; i1 = i2, i2 = i3;
}
}

void main()
{
uint8_t r,r2;

init();

while(1)
{
r=rand()%32;
//r=4;
r2 = rand()%8+1;
switch (r)
{
case 1:
fade_eyes(100*r2);
break;

case 2:
fade_eyes(20*r2);
break;

case 3:
scan_eyes(20*r2);
break;

case 4:
scream(16*r2);
break;

case 5:
scream2(8*r2);
break;

case 6:
scream3(8*r2);
break;

default:
dark_eyes();
}
}
}

Wednesday, March 11, 2015

UV LED Exposure System

This is the layout for an exposure system based on UV LEDs. Be sure to use the wider angle LEDs (30 degrees). I offset a piece of glass about 1-2 inches from the surface when exposing. I am also using a frosted shower glass over the LEDs. You can delete some of these for a smaller system. This one uses 180 LEDs. There are about 3V per LED so you need at least 18V to make this work. Adjust the resistors so that you have the correct current per LED (~30 mA). A 1 amp supply should work for this. I mounted mine in a picture box from Michael's.

Sunday, February 22, 2015

Chiptune Noisemaker revised

/*
* File: noisegenmain.c
* Author: Hans Mikelson
*
* Created on February 13, 2015, 2:42 PM
* Revised February 22, 2015
* This program creates a random sequence of various types of noises
* ranging from computer game like noises to white like noise.
* These are all based on random or periodic on off pulses from the
* microcontroller. This program uses the 12f683 microcontroller but
* should be adaptable to other brands of microcontroller.
*/

#if defined(__XC)
#include <xc.h> /* XC8 General Include File */
#elif defined(HI_TECH_C)
#include <htc.h> /* HiTech General Include File */
#endif

#include <stdint.h> /* For uint8_t definition */
#include <stdbool.h> /* For true/false definition */
#include <stdlib.h> /*rand()*/

#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO
#define _XTAL_FREQ 4000000
uint8_t sGPIO;

void init()
{
//Configure GPIO Port
ANSEL = 0b00000000; //Configure all GPIO pins as digital
TRISIO = 0b11000100; //Set GP1-5 as outputs and the rest as inputs
OPTION_REGbits.nGPPU = 0;
WPU = 0b00000100; //Enable weak pullups on GP2
//Configuer AD Convertor
ADCON0 = 0x00; //AD disabled
ADRESH = 0x00; //Init the AD Register
//Configure Comparator
CMCON0 = 0xFF; // Comparator is turned off
CMCON1 = 0x00; // Comparator is turned off
//Interrupt configuration
INTCON = 0x00; //Disable all interrupts
}

void vdelay(int n)
{
int i;
for (i=0;i<=n;i++)
{
__delay_us(1);
}
}

void noise1(uint8_t r3) // PWM sweep high f to low f
{
int i,j,r1,r2;
r1=rand() & (r3-1);
r2=r3/r1;
for (j=0;j<r1;j++)
{
for (i=0;i<j;i++)
{
GPIO = 0b11110111;
vdelay(i*r2);
GPIO = 0b11000000;
vdelay((j-i)*r2);
}
for (i=0;i<j;i++)
{
GPIO = 0b11110111;
vdelay((j-i)*r2);
GPIO = 0b11000000;
vdelay(i*r2);
}
}
}

void noise4(uint8_t r3) // PWM sweep low f to high f
{
int i,j,r1,r2;
r1=rand() & (r3-1);
r2=r3/r1;
for (j=r1;j>0;j--)
{
for (i=0;i<r1-j;i++)
{
GPIO = 0b11110111;
vdelay(i*r2);
GPIO = 0b11000000;
vdelay((j-i)*r2);
}
for (i=0;i<r1-j;i++)
{
GPIO = 0b11110111;
vdelay((j-i)*r2);
GPIO = 0b11000000;
vdelay(i*r2);
}
}
}

void noise2(uint8_t r3) //PWM sweep down, laser
{
int i,j,r1,r2;
r1=rand() & (r3-1);
r2=r3/r1;
for (j=r2;j<r1;j++)
{
for (i=0;i<j;i++)
{
GPIO = 0b11110111;
vdelay(r2);
GPIO = 0b11000000;
vdelay((j-i)*r2);
}
}
}

void noise3(uint8_t r3) // Pulse noise with different frequencies
{
int j,r1,r2;
r1=rand() & 2047;
r2 = 32*r3/r1;
for (j=0;j<r2;j++)
{
GPIO = 0b11110111;
vdelay(rand() & (r3-1));
GPIO = 0b11000000;
vdelay(rand() & (r3-1));
}
}

void noise5(uint8_t r3) // Long random clicks
{
int j,r1;
r1=rand() & (r3-1);
for (j=0;j<r1/4;j++)
{
GPIO = 0b11110111;
vdelay(r3*8);
GPIO = 0b11000000;
vdelay(rand());
}
}

void noise6(uint8_t r3) // Short random clicks
{
int j,r1;
r1=rand() & (r3-1);
for (j=0;j<r1/2;j++)
{
GPIO = 0b11110111;
vdelay(r3*2);
GPIO = 0b11000000;
vdelay(rand() & 8191);
}
}

void noise7(uint8_t r3) // PWM sweep low f to high f
{
int i,j,r1,r2;
r1=(rand() & (r3-1))/4;
r2=r3/r1;
for (j=r1;j>0;j--)
{
for (i=0;i<r1-j;i++)
{
GPIO = 0b11110111;
vdelay(i*r2);
GPIO = 0b11000000;
vdelay((j-i)*r2);
vdelay(rand() & ((r3-1)/4));
}
for (i=0;i<r1-j;i++)
{
GPIO = 0b11110111;
vdelay((j-i)*r2);
vdelay(rand() & ((r3-1)/4));
GPIO = 0b11000000;
vdelay(i*r2);
}
}
}

void main()
{
uint8_t ra[8]={2,4,4,8,16,32,64,128};
int r,r4;

init();
r=0;
while(1)
{
//r = rand()&7;
if (GPIObits.GP2 == 0)
{
r=(r+1)%7;
vdelay(1000000);
}
r4=rand()&7;
switch (r)
{
case 1:
noise1(ra[r4]);
//vdelay(rand());
break;

case 2:
noise2(ra[r4]);
//vdelay(rand());
break;

case 3:
noise3(ra[r4]);
//vdelay(rand());
break;

case 4:
noise1(ra[r4]);
noise4(ra[r4]);
//vdelay(rand());
break;

case 5:
noise5(ra[r4]);
//vdelay(rand());
break;

case 6:
noise6(ra[r4]);
//vdelay(rand());
break;

default:
noise7(ra[r4]);
//vdelay(rand());
}
}
}

Friday, February 20, 2015

Very Simple Drum Machine

// Drum Machine by Hans Mikelson
//
#if defined(__XC)
    #include <xc.h>         /* XC8 General Include File */
#elif defined(HI_TECH_C)
    #include <htc.h>        /* HiTech General Include File */
#endif

#include <stdint.h>        /* For uint8_t definition */
#include <stdbool.h>       /* For true/false definition */
#include <stdlib.h>

//#fuses NOMCLR,NOPROTECT,NOWDT,INTRC
//#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCCLK
#pragma config MCLRE=OFF,CP=OFF,WDTE=OFF,FOSC=INTOSCIO

#define _XTAL_FREQ 4000000

void init()
{
    //Configure GPIO Port
    ANSEL = 0b11111001; //Configure all GPIO pins as digital
    ANSELbits.ADCS=0b100;
    TRISIO = 0b11111001; //Set GP1 as output and the rest as inputs
    WPU = 0x00;           //Disable weak pullups
    //Configuer AD Convertor
    ADCON0bits.ADON=1;
    ADCON0bits.CHS = 0b00;   // AD Ch0 selected
    ADCON0bits.ADFM = 0;     // Left justified 10 bits
    ADRESH = 0x00;           //Init the AD Register
    //Configure Comparator
    CMCON0 = 0xFF;   // Comparator is turned off
    CMCON1 = 0x00;   // Comparator is turned off
    //Interrupt configuration
    INTCON = 0x00;   //Disable all interrupts
}

void vdelay(uint8_t delrpt)
{
    uint8_t i;
    for (i=0;i<=delrpt;i++)
    {
        __delay_ms(10);
    }
}

void main()
{
    uint8_t rthm1,delrpt,i,j,cv;
    init();
    rthm1 = 0b10001010;
    while(1)
    {
     GPIO = rthm1 & 0b00000010;
     rthm1 = (rthm1 << 1)|(rthm1>>7);
     __delay_ms(1);
     GPIO = 0b00000000;
     ADCON0bits.GO = 1;
     while(ADCON0bits.nDONE);
     delrpt = ADRESH >> 3;
     cv=rand()>>13;
     //cv = 2;
     for (j=0;j<delrpt;j++)
     {
     for (i=0;i<16;i++)
      {
         if(i<cv)
        {
         GPIO = 0b00000100;
        }
         else
         {
          GPIO = 0b00000000;
         }
         __delay_ms(1);
     }
     }
     //vdelay(delrpt);
    }
}