/* FILE / DATE: tone_generator_0502.c / 2010-05-02
DESCRIPTION: Tone generator for DCF simulator
MICRO-PROCESSOR: PIC16F628
COMPILER: B Knudsen Cc5x C-compiler - not ANSI-C
EXTERNAL HW: Output amplifier
3 pins on PIC16F690 (Sound selection)
2 pins on PIC16F886 (Sound trigger)
DESIGNER: Hans Sundgren
RAM usage: 4 bytes (3 local), 220 bytes free
CODE WORDS: 181 code words (8 %)
CHIP CONNECTIONS ********************************************
________ _______
| \/ |
| PIC16F628 |
---|RA2 1 18 RA1|->- Sound output
---|RA3 2 17 RA0|---
---|RA4 3 16 RA7|---
---|RA5 4 15 RA6|---
GND ---|Vss 5 14 Vdd|--- +5V
Sound mode.1 ->-|RB0 6 13 RB7|---
Sound mode.2 ->-|RB1 7 12 RB6|---
Sound mode.3 ->-|RB2 8 11 RB5|-<- Trigger.0
---|RB3 9 10 RB4|-<- Trigger.1
|_________________|
INPUT: SOUND TRIGGER (fron PIC16F886)
__________________________________________________________
| Type | Function | Pin |
|---------------------|------------------------------------|
| "Null" sound | Trigger 0 sound (RA6) | RB5 |
| "One" sound | Trigger 1 sound (RA7) | RB4 |
|_____________________|__________________________|_________|
INPUT: SOUND SELECTION (fron PIC16F690)
__________________________________________________________
| Type | Function | Pin |
|---------------------|------------------------------------|
| Sound mode 1 bit | Interface (RB4) | RB0 |
| Sound mode 2 bit | Interface (RB5) | RB1 |
| Sound mode 3 bit | Interface (RB6) | RB2 |
|_____________________|__________________________|_________|
OUTPUT: SOUND to amplifier
__________________________________________________________
| Type | Function | Pin |
|---------------------|------------------------------------|
| Digital output | Sound | RA1 |
|_____________________|__________________________|_________|
PROGRAM OVERVIEW *******************************************
Main ---------------------------------------------------
| Initialization |
| Loop |
| Read mode bits and convert to decimal mode |
| If mode = 1 |
| Play click sound |
| If mode = 2 |
| Play other sound |
| If mode = 3 |
| Play other sound |
| If mode = 4 |
| Play other sound |
| <can be expanded up to mode = 7> |
--------------------------------------------------------
*/
/* _______________________________ INCLUDE __________________________ */
#include "16f628.h"
#include "int16CXX.h"
/* _______________________________ CONFIGURATION ____________________ */
#pragma config |= 0x3f10 // use internal 4MHz oscillator
/* _______________________________ GLOBAL VARIABLES _________________ */
char mode; // Ordered sound mode from PIC "Sound selection"
/* _______________________________ FUNCTIONS ________________________ */
void delay( char millisec);
void delay250us ( char millisec);
void delay10( char );
void tone_a (void);
void tone_b (void);
/* _______________________________ I/O PIN DEFINITIONS ____ */
#pragma bit TONE @ PORTA.1 // Main output to transmitter
#pragma bit MODE_1 @ PORTB.0 // Sound selection bit 1
#pragma bit MODE_2 @ PORTB.1 // Sound selection bit 2
#pragma bit MODE_3 @ PORTB.2 // Sound selection bit 3
#pragma bit TRIG_0 @ PORTB.4 // "Null" signal from DCF simulator
#pragma bit TRIG_1 @ PORTB.5 // "One" signal from DCF simulator
/* _______________________________ MAIN FUNCTION start ________________________ */
void main(void)
{
TRISA = 0b0000.0000; // A1 = output
TRISB = 0b0011.0111; // B0, B1, B4, B5 = inputs
OPTION.7 = 0; // Activate internal pullup resistors
CM0=1; CM1=1; CM2=1; // No comparators on PORTA
while(1)
{
mode.0 = MODE_1; // Read mode from Sound Selection PIC
mode.1 = MODE_2;
mode.2 = MODE_3;
if (mode == 1)
{
char s;
if (TRIG_0 == 1)
{
for (s=0; s<6; s++)
{
tone_a ();
}
delay10(20); // Wait for TRIG_0 to reset to 0
}
if (TRIG_1 == 1)
{
for (s=0; s<6; s++)
{
tone_b ();
}
delay10(25); // Wait for TRIG_1 to reset to 0
}
}
if (mode == 2)
{
while (TRIG_0 == 1)
{
tone_a ();
}
while (TRIG_1 == 1)
{
tone_b ();
}
}
if (mode == 3)
{
if (TRIG_0 == 0 && TRIG_1 == 0)
{
tone_b ();
}
}
if (mode == 4)
{
if (TRIG_0 == 0 && TRIG_1 == 0)
{
tone_a ();
}
}
}
}
/* _______________________________ FUNCTIONS ________________________ */
void tone_a (void)
{
nop();
delay(2);
TONE = 1;
delay(2);
TONE = 0;
}
void tone_b (void)
{
nop();
delay(1);
TONE = 1;
delay(1);
TONE = 0;
}
void delay10( char n)
{
char i;
OPTION = 7;
do {
i = TMR0 + 39; /* 256 microsec * 39 = 10 ms */
while ( i != TMR0) ;
} while ( --n > 0);
}
void delay ( char millisec)
/*
Delays a multiple of 1 milliseconds at 4 MHz
using the TMR0 timer
*/
{
OPTION = 2; /* prescaler divide by 8 */
do {
TMR0 = 0;
while ( TMR0 < 125) /* 125 * 8 = 1000 */
;
} while ( -- millisec > 0);
}
void delay250us ( char millisec)
{
char m;
char k;
for (m=0; m<millisec; m++)
{
for (k=0; k<250; k++)
{
nop();
}
}
}