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22 lines
549 B
22 lines
549 B
10 years ago
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#pragma once
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/**
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Functions for precise delays (nanoseconds / cycles)
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*/
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#include <avr/io.h>
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#include <util/delay_basic.h>
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#include <stdint.h>
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/* Convert nanoseconds to cycle count */
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#define ns2cycles(ns) ( (ns) / (1000000000L / (signed long) F_CPU) )
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/** Wait c cycles */
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#define delay_c(c) (((c) > 0) ? __builtin_avr_delay_cycles(c) : __builtin_avr_delay_cycles(0))
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/** Wait n nanoseconds, plus c cycles */
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#define delay_ns_c(ns, c) delay_c(ns2cycles(ns) + (c))
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/** Wait n nanoseconds */
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#define delay_ns(ns) delay_c(ns2cycles(ns))
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