kopia lustrzana https://gitlab.com/markol/Teathimble_Firmware
105 wiersze
2.6 KiB
C
105 wiersze
2.6 KiB
C
#ifndef _TIMER_H
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#define _TIMER_H
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#include <stdint.h>
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//#include "arduino.h" // For F_CPU on ARM.
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// time-related constants
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#define US * (F_CPU / 1000000)
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#define MS * (F_CPU / 1000)
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/// How often we overflow and update our clock.
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/// With F_CPU = 16MHz, max is < 4.096ms (TICK_TIME = 65535).
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#define TICK_TIME (2 MS)
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/// Convert back to ms from cpu ticks so our system clock runs
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/// properly if you change TICK_TIME.
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#define TICK_TIME_MS (TICK_TIME / (F_CPU / 1000))
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#if defined __AVR__
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#include <avr/version.h>
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// Provide a memory barrier to the compiler. This informs
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// the compiler that is should write any cached values that
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// are destined for a global variable and discard any other
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// cached values from global variables.
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//
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// Note that this behavior does apply to all global variables,
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// not just volatile ones. However, cached local variables
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// are not affected as they are not externally visible.
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#define MEMORY_BARRIER() __asm volatile( "" ::: "memory" )
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// There is a bug in the CLI/SEI functions in older versions of
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// avr-libc - they should be defined to include a memory barrier.
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// This macro is used to define the barrier in the code so that
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// it will be easy to remove once the bug has become ancient history.
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// At the moment the bug is included in most of the distributed
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// compilers.
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#if __AVR_LIBC_VERSION__ < 10700UL
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#define CLI_SEI_BUG_MEMORY_BARRIER() MEMORY_BARRIER()
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#else
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#define CLI_SEI_BUG_MEMORY_BARRIER()
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#endif
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#define ATOMIC_START { \
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uint8_t save_reg = SREG; \
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cli(); \
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CLI_SEI_BUG_MEMORY_BARRIER();
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#define ATOMIC_END MEMORY_BARRIER(); \
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SREG = save_reg; \
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}
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#elif defined __ARMEL__
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#define ATOMIC_START cli();
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#define ATOMIC_END sei();
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#define MEMORY_BARRIER()
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#elif defined SIMULATOR
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#define CLI_SEI_BUG_MEMORY_BARRIER()
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#define MEMORY_BARRIER()
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#define ATOMIC_START { \
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uint8_t save_reg = sim_interrupts; \
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cli();
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#define ATOMIC_END MEMORY_BARRIER(); \
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if (save_reg) sei(); \
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}
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#endif /* __AVR__, __ARMEL__, SIMULATOR */
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#ifdef __cplusplus
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extern "C" {
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#endif
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void timer_init(void);
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void cpu_init();
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#ifdef __cplusplus
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}
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#endif
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uint8_t timer_set(int32_t delay, uint8_t check_short);
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void timer_reset(void);
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void timer_stop(void);
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// Should be called every TICK_TIME (currently 2 ms).
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//void clock_tick(void);
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// Called in busy loops
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//void clock(void);
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// TIMER
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// microsecond delay, does NOT reset WDT if feature enabled
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void delay_us(uint16_t delay);
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#endif /* _TIMER_H */
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