140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
#ifndef __INC_FL_DELAY_H
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#define __INC_FL_DELAY_H
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#include "FastLED.h"
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///@file fastled_delay.h
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///Utility functions and classes for managing delaycycles
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FASTLED_NAMESPACE_BEGIN
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/// Class to ensure that a minimum amount of time has kicked since the last time run - and delay if not enough time has passed yet
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/// this should make sure that chipsets that have
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template<int WAIT> class CMinWait {
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uint16_t mLastMicros;
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public:
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CMinWait() { mLastMicros = 0; }
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void wait() {
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uint16_t diff;
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do {
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diff = (micros() & 0xFFFF) - mLastMicros;
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} while(diff < WAIT);
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}
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void mark() { mLastMicros = micros() & 0xFFFF; }
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};
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////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Clock cycle counted delay loop
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//
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////////////////////////////////////////////////////////////////////////////////////////////
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// Default is now just 'nop', with special case for AVR
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// ESP32 core has it's own definition of NOP, so undef it first
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#ifdef ESP32
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#undef NOP
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#undef NOP2
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#endif
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#if defined(__AVR__)
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# define FL_NOP __asm__ __volatile__ ("cp r0,r0\n");
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# define FL_NOP2 __asm__ __volatile__ ("rjmp .+0");
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#else
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# define FL_NOP __asm__ __volatile__ ("nop\n");
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# define FL_NOP2 __asm__ __volatile__ ("nop\n\t nop\n");
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#endif
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// predeclaration to not upset the compiler
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template<int CYCLES> inline void delaycycles();
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template<int CYCLES> inline void delaycycles_min1() {
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delaycycles<1>();
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delaycycles<CYCLES-1>();
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}
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// TODO: ARM version of _delaycycles_
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// usable definition
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#if defined(FASTLED_AVR)
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// worker template - this will nop for LOOP * 3 + PAD cycles total
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template<int LOOP, int PAD> inline void _delaycycles_AVR() {
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delaycycles<PAD>();
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// the loop below is 3 cycles * LOOP. the LDI is one cycle,
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// the DEC is 1 cycle, the BRNE is 2 cycles if looping back and
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// 1 if not (the LDI balances out the BRNE being 1 cycle on exit)
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__asm__ __volatile__ (
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" LDI R16, %0\n"
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"L_%=: DEC R16\n"
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" BRNE L_%=\n"
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: /* no outputs */
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: "M" (LOOP)
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: "r16"
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);
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}
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template<int CYCLES> __attribute__((always_inline)) inline void delaycycles() {
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_delaycycles_AVR<CYCLES / 3, CYCLES % 3>();
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}
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#else
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// template<int LOOP, int PAD> inline void _delaycycles_ARM() {
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// delaycycles<PAD>();
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// // the loop below is 3 cycles * LOOP. the LDI is one cycle,
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// // the DEC is 1 cycle, the BRNE is 2 cycles if looping back and
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// // 1 if not (the LDI balances out the BRNE being 1 cycle on exit)
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// __asm__ __volatile__ (
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// " mov.w r9, %0\n"
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// "L_%=: subs.w r9, r9, #1\n"
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// " bne.n L_%=\n"
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// : /* no outputs */
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// : "M" (LOOP)
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// : "r9"
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// );
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// }
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template<int CYCLES> __attribute__((always_inline)) inline void delaycycles() {
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// _delaycycles_ARM<CYCLES / 3, CYCLES % 3>();
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FL_NOP; delaycycles<CYCLES-1>();
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}
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#endif
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// pre-instantiations for values small enough to not need the loop, as well as sanity holders
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// for some negative values.
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template<> __attribute__((always_inline)) inline void delaycycles<-10>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-9>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-8>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-7>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-6>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-5>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-4>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-3>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-2>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<-1>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<0>() {}
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template<> __attribute__((always_inline)) inline void delaycycles<1>() {FL_NOP;}
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template<> __attribute__((always_inline)) inline void delaycycles<2>() {FL_NOP2;}
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template<> __attribute__((always_inline)) inline void delaycycles<3>() {FL_NOP;FL_NOP2;}
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template<> __attribute__((always_inline)) inline void delaycycles<4>() {FL_NOP2;FL_NOP2;}
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template<> __attribute__((always_inline)) inline void delaycycles<5>() {FL_NOP2;FL_NOP2;FL_NOP;}
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// Some timing related macros/definitions
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// Macro to convert from nano-seconds to clocks and clocks to nano-seconds
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// #define NS(_NS) (_NS / (1000 / (F_CPU / 1000000L)))
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#define F_CPU_MHZ (F_CPU / 1000000L)
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// #define NS(_NS) ( (_NS * (F_CPU / 1000000L))) / 1000
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#define NS(_NS) (((_NS * F_CPU_MHZ) + 999) / 1000)
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#define CLKS_TO_MICROS(_CLKS) ((long)(_CLKS)) / (F_CPU / 1000000L)
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// Macro for making sure there's enough time available
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#define NO_TIME(A, B, C) (NS(A) < 3 || NS(B) < 3 || NS(C) < 6)
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FASTLED_NAMESPACE_END
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#endif
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