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;
}
}
}
