@ -3,10 +3,10 @@
* Project BPM clock generator for Arduino
* @ brief A Library to implement BPM clock tick calls using hardware timer1 interruption . Tested on ATmega168 / 328 , ATmega16u4 / 32u 4 and ATmega2560 .
* Derived work from mididuino MidiClock class . ( c ) 2008 - 2011 - Manuel Odendahl - wesen @ ruinwesen . com
* @ version 0.10 .5
* @ version 0.10 .6
* @ author Romulo Silva
* @ date 08 / 14 / 2021
* @ license MIT - ( c ) 2021 - Romulo Silva - contact @ midilab . co
* @ date 13 / 03 / 2022
* @ license MIT - ( c ) 2022 - Romulo Silva - contact @ midilab . co
*
* Permission is hereby granted , free of charge , to any person obtaining a
* copy of this software and associated documentation files ( the " Software " ) ,
@ -28,6 +28,16 @@
*/
# include "uClock.h"
// pickup a avr timer to make use.
// pickup only one!
// try to avoid timer0, only use it if you know what you are doing.
// 0 = delay(), millis() e micros()
// 1 = Servo.h library(any other?)
// 2 = tone()
//#define AVR_TIMER_0
# define AVR_TIMER_1
//#define AVR_TIMER_2
//
// Timer setup for work clock
//
@ -47,12 +57,31 @@ void uclockInitTimer()
# else
void uclockInitTimer ( )
{
# if defined(AVR_TIMER_0)
ATOMIC (
// Timer0 init
TCCR0A = 0 ;
TCCR0B = 0 ;
TCNT0 = 0 ;
// set compare match register for 62500 Hz increments
// = 16000000 / (1 * 62500) - 1 (must be <256)
OCR0A = 255 ;
// turn on CTC mode
TCCR0B | = ( 1 < < WGM02 ) ;
// Set CS02, CS01 and CS00 bits for 1 prescaler
TCCR0B | = ( 0 < < CS02 ) | ( 0 < < CS01 ) | ( 1 < < CS00 ) ;
// enable timer compare interrupt
TIMSK0 | = ( 1 < < OCIE0A ) ;
)
# endif
# if defined(AVR_TIMER_1)
ATOMIC (
// Timer1
// Timer1 init
TCCR1A = 0 ;
TCCR1B = 0 ;
TCNT1 = 0 ;
// set the speed of our internal clock system
// set compare match register for 62500 Hz increments
// = 16000000 / (1 * 62500) - 1 (must be <65536)
OCR1A = 255 ;
// turn on CTC mode
TCCR1B | = ( 1 < < WGM12 ) ;
@ -61,22 +90,24 @@ void uclockInitTimer()
// enable timer compare interrupt
TIMSK1 | = ( 1 < < OCIE1A ) ;
)
/*
# endif
# if defined(AVR_TIMER_2)
ATOMIC (
// Timer2
// Timer2 init
TCCR2A = 0 ;
TCCR2B = 0 ;
TCNT2 = 0 ;
// set the speed of our internal clock system
// set compare match register for 62500 Hz increments
// = 16000000 / (1 * 62500) - 1 (must be <256)
OCR2A = 255 ;
// turn on CTC mode
TCCR2B | = ( 1 < < WGM21 ) ;
TCCR2B | = ( 1 < < WGM22 ) ;
// Set CS22, CS21 and CS20 bits for 1 prescaler
TCCR2B | = ( 0 < < CS22 ) | ( 0 < < CS21 ) | ( 1 < < CS20 ) ;
// enable timer compare interrupt
TIMSK2 | = ( 1 < < OCIE2A ) ;
)
*/
# endif
}
# endif
@ -431,8 +462,15 @@ volatile uint32_t _timer = 0;
# if defined(TEENSYDUINO) && !defined(__AVR_ATmega32U4__)
void uclockISR ( )
# else
# if defined(AVR_TIMER_0)
ISR ( TIMER0_COMPA_vect )
# endif
# if defined(AVR_TIMER_1)
ISR ( TIMER1_COMPA_vect )
//ISR(TIMER2_COMPA_vect)
# endif
# if defined(AVR_TIMER_2)
ISR ( TIMER2_COMPA_vect )
# endif
# endif
{
// global timer counter
midilab
3 years ago