mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-09-04 05:29:04 +00:00
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
#ifndef CONTIKI_CLOCK_AVR_H
|
|
#define CONTIKI_CLOCK_AVR_H
|
|
|
|
#if defined (__AVR_ATmega128__)
|
|
|
|
#define AVR_OUTPUT_COMPARE_INT TIMER0_COMP_vect
|
|
|
|
#define OCRSetup() \
|
|
/* Select internal clock */ \
|
|
ASSR = 0x00; \
|
|
\
|
|
/* Set counter to zero */ \
|
|
TCNT0 = 0; \
|
|
\
|
|
/* \
|
|
* Set comparison register: \
|
|
* Crystal freq. is 16000000,\
|
|
* pre-scale factor is 1024, i.e. we have 125 "ticks" / sec: \
|
|
* 16000000 = 1024 * 125 * 125 \
|
|
*/ \
|
|
OCR0 = 125; \
|
|
\
|
|
/* \
|
|
* Set timer control register: \
|
|
* - prescale: 1024 (CS00 - CS02) \
|
|
* - counter reset via comparison register (WGM01) \
|
|
*/ \
|
|
TCCR0 = _BV(CS00) | _BV(CS01) | _BV(CS02) | _BV(WGM01); \
|
|
\
|
|
/* Clear interrupt flag register */ \
|
|
TIFR = 0x00; \
|
|
\
|
|
/* \
|
|
* Raise interrupt when value in OCR0 is reached. Note that the \
|
|
* counter value in TCNT0 is cleared automatically. \
|
|
*/ \
|
|
TIMSK = _BV (OCIE0);
|
|
|
|
#elif defined (__AVR_ATmega1284P__) || (__AVR_AT90USB1287__) || (__AVR_ATmega1281__)
|
|
|
|
#define OCRSetup() \
|
|
/* Select internal clock */ \
|
|
ASSR = 0x00; \
|
|
\
|
|
/* Set counter to zero */ \
|
|
TCNT0 = 0; \
|
|
\
|
|
/* \
|
|
* Set comparison register: \
|
|
* Crystal freq. is 8000000,\
|
|
* pre-scale factor is 1024, i.e. we have 125 "ticks" / sec: \
|
|
* 8000000 = 1024 * 125 * 62.5 \
|
|
*/ \
|
|
OCR0A = 62; \
|
|
\
|
|
/* \
|
|
* Set timer control register: \
|
|
* - prescale: 1024 (CS00 - CS02) \
|
|
* - counter reset via comparison register (WGM01) \
|
|
*/ \
|
|
TCCR0A = _BV(WGM01); \
|
|
TCCR0B = _BV(CS00) | _BV(CS02); \
|
|
\
|
|
/* Clear interrupt flag register */ \
|
|
TIFR0 = TIFR0; \
|
|
\
|
|
/* \
|
|
* Raise interrupt when value in OCR0 is reached. Note that the \
|
|
* counter value in TCNT0 is cleared automatically. \
|
|
*/ \
|
|
TIMSK0 = _BV (OCIE0A);
|
|
|
|
#define AVR_OUTPUT_COMPARE_INT TIMER0_COMPA_vect
|
|
|
|
#else
|
|
#error "Setup CPU in clock-avr.h"
|
|
#endif
|
|
|
|
#endif //CONTIKI_CLOCK_AVR_H
|