46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* gc_n64_usb : Gamecube or N64 controller to USB firmware
|
|
Copyright (C) 2007-2016 Raphael Assenat <raph@raphnet.net>
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <avr/io.h>
|
|
#include "intervaltimer2.h"
|
|
|
|
void intervaltimer2_init(void)
|
|
{
|
|
TCCR0A = (1<<WGM01);
|
|
TCCR0B = (1<<CS02) | (1<<CS00); // CTC, /1024 prescaler
|
|
}
|
|
|
|
void intervaltimer2_set16ms(void)
|
|
{
|
|
int interval_ms = 16;
|
|
|
|
// Maximum 16ms. 17ms overflows the 8-bit OCR0A register (value of 265)
|
|
// 16ms: 250
|
|
|
|
TCNT0 = 0;
|
|
OCR0A = interval_ms * (F_CPU/1024) / 1000;
|
|
}
|
|
|
|
char intervaltimer2_get(void)
|
|
{
|
|
if (TIFR0 & (1<<OCF0A)) {
|
|
TIFR0 = 1<<OCF0A;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|