292 lines
8.1 KiB
C
292 lines
8.1 KiB
C
#ifndef CONTIKI_CLOCK_AVR_H
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#define CONTIKI_CLOCK_AVR_H
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#if defined (__AVR_ATmega128__)
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#define AVR_OUTPUT_COMPARE_INT TIMER0_COMP_vect
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#define OCRSetup() \
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/* Select internal clock */ \
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ASSR = 0x00; \
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\
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/* Set counter to zero */ \
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TCNT0 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU,\
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* pre-scale factor is 1024, we want CLOCK_CONF_SECOND ticks / sec: \
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* F_CPU = 1024 * CLOCK_CONF_SECOND * OCR0 \
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*/ \
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OCR0 = F_CPU/1024UL/CLOCK_CONF_SECOND; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 1024 (CS00 - CS02) \
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* - counter reset via comparison register (WGM01) \
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*/ \
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TCCR0 = _BV(CS00) | _BV(CS01) | _BV(CS02) | _BV(WGM01); \
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\
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/* Clear interrupt flag register */ \
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TIFR = 0x00; \
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\
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/* \
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* Raise interrupt when value in OCR0 is reached. Note that the \
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* counter value in TCNT0 is cleared automatically. \
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*/ \
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TIMSK = _BV (OCIE0);
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#elif defined (__AVR_ATmega128RFA1__) && 0
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/* Uses the general routine below at present */
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#define AVR_OUTPUT_COMPARE_INT TIMER0_COMPA_vect
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#define OCRSetup() \
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/* Select internal clock */ \
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ASSR = 0x00; \
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\
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/* Set counter to zero */ \
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TCNT0 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU,\
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* pre-scale factor is 1024, we want CLOCK_CONF_SECOND ticks / sec: \
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* F_CPU = 1024 * CLOCK_CONF_SECOND * OCR0A, less 1 for CTC mode \
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*/ \
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OCR0A = F_CPU/1024/CLOCK_CONF_SECOND - 1; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 1024 (CS00 - CS02) \
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* - counter reset via comparison register (WGM01) \
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*/ \
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TCCR0A = _BV(WGM01); \
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TCCR0B = _BV(CS00) | _BV(CS02); \
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\
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/* Clear interrupt flag register */ \
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TIFR0 = TIFR0; \
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\
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/* \
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* Raise interrupt when value in OCR0 is reached. Note that the \
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* counter value in TCNT0 is cleared automatically. \
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*/ \
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TIMSK0 = _BV (OCIE0A);
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#elif defined (__AVR_ATmega1284P__) || (__AVR_AT90USB1287__) || (__AVR_ATmega1281__) || defined (__AVR_ATmega128RFA1__) || defined (__AVR_ATmega128RFR2__) || defined (__AVR_ATmega256RFR2__)
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/*
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The Raven has a 32768Hz watch crystal that can be used to clock the timer
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while the 1284p is sleeping. The Jackdaw has pads for a crystal. The crystal
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can be used to clock the 8 bit timer2.
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The 1284p routine also uses TIMER2 to sleep a variable number of seconds.
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It restores the values here after a wake.
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*/
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#if AVR_CONF_USE32KCRYSTAL
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#define AVR_OUTPUT_COMPARE_INT TIMER2_COMPA_vect
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#define OCRSetup() \
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/* Clock from crystal on TOSC0-1 */ \
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ASSR = _BV(AS2); \
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\
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/* Set counter to zero */ \
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TCNT2 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is 32768,\
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* pre-scale factor is 8, we want CLOCK_CONF_SECOND ticks / sec: \
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* 32768 = 8 * CLOCK_CONF_SECOND * OCR2A, less 1 for CTC mode\
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*/ \
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OCR2A = 32768/8/CLOCK_CONF_SECOND - 1; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 8 (CS21) \
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* - counter reset via comparison register (WGM21) \
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*/ \
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TCCR2A = _BV(WGM21); \
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TCCR2B = _BV(CS21); \
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\
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/* Clear interrupt flag register */ \
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TIFR2 = TIFR2; \
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\
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/* \
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* Raise interrupt when value in OCR2 is reached. Note that the \
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* counter value in TCNT2 is cleared automatically. \
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*/ \
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TIMSK2 = _BV (OCIE2A);
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#else /* !AVR_CONF_USE32KCRYSTAL */
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/* Determine the largest value that can be used with 8 bit timer0 */
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#ifndef F_CPU
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#error "Please define CPU clock speed for your platform. #define F_CPU 8000000UL is typical."
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#endif
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#if CLOCK_CONF_SECOND == 0
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#error "Please define timer ticks per second for your platform. #define CLOCK_CONF_SECOND 128 is typical."
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#endif
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#ifdef AVR_CONF_TMR0_PRESCALE
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#elif F_CPU/CLOCK_CONF_SECOND < 256
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#define AVR_CONF_TMR0_PRESCALE 1
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#elif F_CPU/CLOCK_CONF_SECOND < 256 * 8
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#define AVR_CONF_TMR0_PRESCALE 8
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#elif F_CPU/CLOCK_CONF_SECOND < 256 * 64
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#define AVR_CONF_TMR0_PRESCALE 64
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#elif F_CPU/CLOCK_CONF_SECOND < 256 * 256
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#define AVR_CONF_TMR0_PRESCALE 256
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#else
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#define AVR_CONF_TMR0_PRESCALE 1024
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#endif
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#if F_CPU/CLOCK_CONF_SECOND/AVR_CONF_TMR0_PRESCALE > 255
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#error "Can not prescale CPU clock to get specified ticks per second. F_CPU/CLOCK_CONF_SECOND/1024 must be less than 256."
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#endif
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#if AVR_CONF_TMR0_PRESCALE == 1
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#define AVR_TCCR0B_CONF _BV(CS00)
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#elif AVR_CONF_TMR0_PRESCALE == 8
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#define AVR_TCCR0B_CONF _BV(CS01)
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#elif AVR_CONF_TMR0_PRESCALE == 64
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#define AVR_TCCR0B_CONF _BV(CS01) | _BV(CS00)
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#elif AVR_CONF_TMR0_PRESCALE == 256
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#define AVR_TCCR0B_CONF _BV(CS02)
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#elif AVR_CONF_TMR0_PRESCALE == 1024
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#define AVR_TCCR0B_CONF _BV(CS02) | _BV(CS00)
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#else
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#error "Prescale factor not supported. Allowed values are 1,8,64,256,1024."
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#endif
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#define AVR_OUTPUT_COMPARE_INT TIMER0_COMPA_vect
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#define OCRSetup() \
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/* Select internal clock */ \
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ASSR = 0x00; \
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\
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/* Set counter to zero */ \
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TCNT0 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU, prescale is given, \
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* We want CLOCK_CONF_SECOND ticks / sec: \
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* F_CPU = AVR_CONF_TMR0_PRESCALE * CLOCK_CONF_SECOND * OCR2A, less 1 for CTC mode \
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*/ \
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OCR0A = F_CPU/AVR_CONF_TMR0_PRESCALE/CLOCK_CONF_SECOND - 1; \
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\
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/* \
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* Set timer control register: \
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* - prescale according to AVR_CONF_TMR0_PRESCALE \
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* - counter reset via comparison register (WGM01) \
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*/ \
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TCCR0A = _BV(WGM01); \
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TCCR0B = AVR_TCCR0B_CONF; \
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\
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/* Clear interrupt flag register */ \
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TIFR0 = TIFR0; \
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\
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/* \
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* Raise interrupt when value in OCR0 is reached. Note that the \
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* counter value in TCNT0 is cleared automatically. \
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*/ \
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TIMSK0 = _BV (OCIE0A);
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#endif /* AVR_CONF_USE32KCRYSTAL */
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#elif defined (__AVR_ATmega644__) || defined (__AVR_ATmega328P__)
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#define OCRSetup() \
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/* Set counter to zero */ \
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TCNT0 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU,\
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* pre-scale factor is 256, want CLOCK_CONF_SECOND ticks / sec: \
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*/ \
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OCR0A = F_CPU/256UL/CLOCK_CONF_SECOND - 1; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 256 (CS02) \
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* - counter reset via comparison register (WGM01) \
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*/ \
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TCCR0A = _BV(WGM01); \
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TCCR0B = _BV(CS02); \
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\
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/* Clear interrupt flag register */ \
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TIFR0 = 0x00; \
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\
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/* \
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* Raise interrupt when value in OCR0 is reached. Note that the \
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* counter value in TCNT0 is cleared automatically. \
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*/ \
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TIMSK0 = _BV (OCIE0A);
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#define AVR_OUTPUT_COMPARE_INT TIMER0_COMPA_vect
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#elif defined (__AVR_ATmega8515__) || defined (__AVR_ATmega16__) || defined (__AVR_ATmega32__)
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#define AVR_OUTPUT_COMPARE_INT TIMER0_COMP_vect
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#define OCRSetup() \
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/* Set counter to zero */ \
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TCNT0 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU,\
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* pre-scale factor is 256, we want CLOCK_CONF_SECOND ticks / sec: \
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* F_CPU = 256 * CLOCK_CONF_SECOND * OCR0 \
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*/ \
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OCR0 = F_CPU/256UL/CLOCK_CONF_SECOND; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 256 (CS02) \
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* - counter reset via comparison register (WGM01) \
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*/ \
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TCCR0 = _BV(CS02) | _BV(WGM01); \
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\
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/* Clear interrupt flag register */ \
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TIFR = 0x00; \
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\
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/* \
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* Raise interrupt when value in OCR0 is reached. Note that the \
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* counter value in TCNT0 is cleared automatically. \
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*/ \
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TIMSK = _BV (OCIE0);
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#elif defined (__AVR_ATmega8__)
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#define AVR_OUTPUT_COMPARE_INT TIMER2_COMP_vect
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#define OCRSetup() \
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/* Set counter to zero */ \
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TCNT2 = 0; \
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\
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/* \
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* Set comparison register: \
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* Crystal freq. is F_CPU,\
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* pre-scale factor is 256, we want CLOCK_CONF_SECOND ticks / sec: \
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* F_CPU = 256 * CLOCK_CONF_SECOND * OCR2 \
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*/ \
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OCR2 = F_CPU/256UL/CLOCK_CONF_SECOND; \
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\
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/* \
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* Set timer control register: \
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* - prescale: 256 (CS21 CS22) \
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* - counter reset via comparison register (WGM21) \
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*/ \
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TCCR2 = _BV(CS22) | _BV(CS21) | _BV(WGM21); \
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\
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/* Clear interrupt flag register */ \
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TIFR = 0x00; \
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\
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/* \
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* Raise interrupt when value in OCR2 is reached. Note that the \
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* counter value in TCNT2 is cleared automatically. \
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*/ \
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TIMSK = _BV (OCIE2);
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#else
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#error "Setup CPU in clock-avr.h"
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#endif
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#endif //CONTIKI_CLOCK_AVR_H
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