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#ifndef __INC_CLOCKLESS_H
#define __INC_CLOCKLESS_H
#include "controller.h"
#include "lib8tion.h"
#include <avr/interrupt.h> // for cli/se definitions
// Macro to convert from nano-seconds to clocks and clocks to nano-seconds
// #define NS(_NS) (_NS / (1000 / (F_CPU / 1000000L)))
#if F_CPU < 96000000
#define NS(_NS) ( (_NS * (F_CPU / 1000000L))) / 1000
#define CLKS_TO_MICROS(_CLKS) ((long)(_CLKS)) / (F_CPU / 1000000L)
#else
#define NS(_NS) ( (_NS * (F_CPU / 2000000L))) / 1000
#define CLKS_TO_MICROS(_CLKS) ((long)(_CLKS)) / (F_CPU / 2000000L)
#endif
// Macro for making sure there's enough time available
#define NO_TIME(A, B, C) (NS(A) < 3 || NS(B) < 3 || NS(C) < 6)
#if defined(__MK20DX128__)
extern volatile uint32_t systick_millis_count;
# define MS_COUNTER systick_millis_count
#else
# if defined(CORE_TEENSY)
extern volatile unsigned long timer0_millis_count;
# define MS_COUNTER timer0_millis_count
# else
extern volatile unsigned long timer0_millis;
# define MS_COUNTER timer0_millis
# endif
#endif
// Scaling macro choice
#if defined(LIB8_ATTINY)
# define INLINE_SCALE(B, SCALE) delaycycles<3>
# warning "No hardware multiply, inline brightness scaling disabled"
#else
# define INLINE_SCALE(B, SCALE) B = scale8_LEAVING_R1_DIRTY(B, SCALE)
#endif
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Base template for clockless controllers. These controllers have 3 control points in their cycle for each bit. The first point
// is where the line is raised hi. The second pointsnt is where the line is dropped low for a zero. The third point is where the
// line is dropped low for a one. T1, T2, and T3 correspond to the timings for those three in clock cycles.
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <uint8_t DATA_PIN, int T1, int T2, int T3, EOrder RGB_ORDER = RGB, int WAIT_TIME = 50>
class ClocklessController : public CLEDController {
typedef typename FastPin<DATA_PIN>::port_ptr_t data_ptr_t;
typedef typename FastPin<DATA_PIN>::port_t data_t;
data_t mPinMask;
data_ptr_t mPort;
CMinWait<WAIT_TIME> mWait;
public:
virtual void init() {
FastPin<DATA_PIN>::setOutput();
mPinMask = FastPin<DATA_PIN>::mask();
mPort = FastPin<DATA_PIN>::port();
}
#if defined(__MK20DX128__)
// We don't use the bitSetFast methods for ARM.
#else
template <int N>inline static void bitSetFast(register data_ptr_t port, register data_t hi, register data_t lo, register uint8_t b) {
// First cycle
FastPin<DATA_PIN>::fastset(port, hi); // 1/2 clock cycle if using out
delaycycles<T1 - (_CYCLES(DATA_PIN) + 1)>(); // 1st cycle length minus 1/2 clock for out, 1 clock for sbrs
__asm__ __volatile__ ("sbrs %0, %1" :: "r" (b), "M" (N) :); // 1 clock for check (+1 if skipping, next op is also 1 clock)
// Second cycle
FastPin<DATA_PIN>::fastset(port, lo); // 1/2 clock cycle if using out
delaycycles<T2 - _CYCLES(DATA_PIN)>(); // 2nd cycle length minus 1/2 clock for out
// Third cycle
FastPin<DATA_PIN>::fastset(port, lo); // 1 clock cycle if using out
delaycycles<T3 - _CYCLES(DATA_PIN)>(); // 3rd cycle length minus 1 clock for out
}
#define END_OF_BYTE
#define END_OF_LOOP 6 // loop compare, jump, next uint8_t load
template <int N, int ADJ>inline static void bitSetLast(register data_ptr_t port, register data_t hi, register data_t lo, register uint8_t b) {
// First cycle
FastPin<DATA_PIN>::fastset(port, hi); // 1 clock cycle if using out, 2 otherwise
delaycycles<T1 - (_CYCLES(DATA_PIN))>(); // 1st cycle length minus 1 clock for out, 1 clock for sbrs
__asm__ __volatile__ ("sbrs %0, %1" :: "r" (b), "M" (N) :); // 1 clock for check (+1 if skipping, next op is also 1 clock)
// Second cycle
FastPin<DATA_PIN>::fastset(port, lo); // 1/2 clock cycle if using out
delaycycles<T2 - (_CYCLES(DATA_PIN))>(); // 2nd cycle length minus 1/2 clock for out
// Third cycle
FastPin<DATA_PIN>::fastset(port, lo); // 1/2 clock cycle if using out
delaycycles<T3 - (_CYCLES(DATA_PIN) + ADJ)>(); // 3rd cycle length minus 7 clocks for out, loop compare, jump, next uint8_t load
}
#endif
virtual void clearLeds(int nLeds) {
showColor(CRGB(0, 0, 0), nLeds, 0);
}
// set all the leds on the controller to a given color
virtual void showColor(const struct CRGB & data, int nLeds, uint8_t scale = 255) {
mWait.wait();
cli();
showRGBInternal<0, false>(nLeds, scale, (const byte*)&data);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(nLeds * 24 * (T1 + T2 + T3));
MS_COUNTER += (microsTaken / 1000);
sei();
mWait.mark();
}
virtual void show(const struct CRGB *rgbdata, int nLeds, uint8_t scale = 255) {
mWait.wait();
cli();
showRGBInternal<0, true>(nLeds, scale, (const byte*)rgbdata);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(nLeds * 24 * (T1 + T2 + T3));
MS_COUNTER += (microsTaken / 1000);
sei();
mWait.mark();
}
#ifdef SUPPORT_ARGB
virtual void show(const struct CARGB *rgbdata, int nLeds, uint8_t scale = 255) {
mWait.wait();
cli();
showRGBInternal<1, true>(nLeds, scale, (const byte*)rgbdata);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(nLeds * 24 * (T1 + T2 + T3));
MS_COUNTER += (microsTaken / 1000);
sei();
mWait.mark();
}
#endif
#if defined(__MK20DX128__)
inline static void write8Bits(register data_ptr_t port, register data_t hi, register data_t lo, register uint32_t & b) __attribute__ ((always_inline)) {
// TODO: hand rig asm version of this method. The timings are based on adjusting/studying GCC compiler ouptut. This
// will bite me in the ass at some point, I know it.
for(register uint32_t i = 7; i > 0; i--) {
FastPin<DATA_PIN>::fastset(port, hi);
delaycycles<T1 - 5>(); // 5 cycles - 2 store, 1 and, 1 test, 1 if
if(b & 0x80) { FastPin<DATA_PIN>::fastset(port, hi); } else { FastPin<DATA_PIN>::fastset(port, lo); }
b <<= 1;
delaycycles<T2 - 2>(); // 2 cycles, 1 store/skip, 1 shift
FastPin<DATA_PIN>::fastset(port, lo);
delaycycles<T3 - 5>(); // 3 cycles, 2 store, 1 sub, 1 branch backwards
}
// delay an extra cycle because falling out of the loop takes on less cycle than looping around
delaycycles<1>();
FastPin<DATA_PIN>::fastset(port, hi);
delaycycles<T1 - 6>();
if(b & 0x80) { FastPin<DATA_PIN>::fastset(port, hi); } else { FastPin<DATA_PIN>::fastset(port, lo); }
delaycycles<T2 - 2>(); // 4 cycles, 2 store, store/skip
FastPin<DATA_PIN>::fastset(port, lo);
}
#endif
// This method is made static to force making register Y available to use for data on AVR - if the method is non-static, then
// gcc will use register Y for the this pointer.
template<int SKIP, bool ADVANCE> static void showRGBInternal(register int nLeds, register uint8_t scale, register const byte *rgbdata) {
register byte *data = (byte*)rgbdata;
register data_t mask = FastPin<DATA_PIN>::mask();
register data_ptr_t port = FastPin<DATA_PIN>::port();
nLeds *= (3 + SKIP);
register uint8_t *end = data + nLeds;
register data_t hi = *port | mask;
register data_t lo = *port & ~mask;
*port = lo;
#if defined(__MK20DX128__)
register uint32_t b;
b = ((ADVANCE)?data:rgbdata)[SKIP + RGB_BYTE0(RGB_ORDER)];
b = scale8(b, scale);
while(data < end) {
// Write first byte, read next byte
write8Bits(port, hi, lo, b);
b = ((ADVANCE)?data:rgbdata)[SKIP + RGB_BYTE1(RGB_ORDER)];
INLINE_SCALE(b, scale);
delaycycles<T3 - 5>(); // 1 store, 2 load, 1 mul, 1 shift,
// Write second byte
write8Bits(port, hi, lo, b);
b = ((ADVANCE)?data:rgbdata)[SKIP + RGB_BYTE2(RGB_ORDER)];
INLINE_SCALE(b, scale);
data += 3 + SKIP;
if((RGB_ORDER & 0070) == 0) {
delaycycles<T3 - 6>(); // 1 store, 2 load, 1 mul, 1 shift, 1 adds if BRG or GRB
} else {
delaycycles<T3 - 5>(); // 1 store, 2 load, 1 mul, 1 shift,
}
// Write third byte
write8Bits(port, hi, lo, b);
b = ((ADVANCE)?data:rgbdata)[SKIP + RGB_BYTE0(RGB_ORDER)];
INLINE_SCALE(b, scale);
delaycycles<T3 - 11>(); // 1 store, 2 load (with increment), 1 mul, 1 shift, 1 cmp, 1 branch backwards, 1 movim
};
#else
#if 0
register uint8_t b = *data++;
while(data <= end) {
bitSetFast<7>(port, hi, lo, b);
bitSetFast<6>(port, hi, lo, b);
bitSetFast<5>(port, hi, lo, b);
bitSetFast<4>(port, hi, lo, b);
bitSetFast<3>(port, hi, lo, b);
// Leave an extra 2 clocks for the next byte load
bitSetLast<2, 2>(port, hi, lo, b);
register uint8_t next = *data++;
// Leave an extra 4 clocks for the scale
bitSetLast<1, 4>(port, hi, lo, b);
next = scale8(next, scale);
bitSetLast<0, END_OF_LOOP>(port, hi, lo, b);
b = next;
}
#else
register uint8_t b;
if(ADVANCE) {
b = data[SKIP + RGB_BYTE0(RGB_ORDER)];
} else {
b = rgbdata[SKIP + RGB_BYTE0(RGB_ORDER)];
}
b = scale8_LEAVING_R1_DIRTY(b, scale);
register uint8_t c;
register uint8_t d;
while(data < end) {
for(register byte x=5; x; x--) {
bitSetLast<7, 4>(port, hi, lo, b);
b <<= 1;
}
delaycycles<1>();
// Leave an extra 2 clocks for the next byte load
bitSetLast<7, 1>(port, hi, lo, b);
delaycycles<1>();
// Leave an extra 4 clocks for the scale
bitSetLast<6, 6>(port, hi, lo, b);
if(ADVANCE) {
c = data[SKIP + RGB_BYTE1(RGB_ORDER)];
} else {
c = rgbdata[SKIP + RGB_BYTE1(RGB_ORDER)];
delaycycles<1>();
}
INLINE_SCALE(c, scale);
bitSetLast<5, 1>(port, hi, lo, b);
for(register byte x=5; x; x--) {
bitSetLast<7, 4>(port, hi, lo, c);
c <<= 1;
}
delaycycles<1>();
// Leave an extra 2 clocks for the next byte load
bitSetLast<7, 1>(port, hi, lo, c);
delaycycles<1>();
// Leave an extra 4 clocks for the scale
bitSetLast<6, 6>(port, hi, lo, c);
if(ADVANCE) {
d = data[SKIP + RGB_BYTE2(RGB_ORDER)];
} else {
d = rgbdata[SKIP + RGB_BYTE2(RGB_ORDER)];
delaycycles<1>();
}
INLINE_SCALE(d, scale);
bitSetLast<5, 1>(port, hi, lo, c);
for(register byte x=5; x; x--) {
bitSetLast<7, 4>(port, hi, lo, d);
d <<= 1;
}
delaycycles<1>();
// Leave an extra 2 clocks for the next byte load
bitSetLast<7, 2>(port, hi, lo, d);
data += (SKIP + 3);
// Leave an extra 4 clocks for the scale
bitSetLast<6, 6>(port, hi, lo, d);
if(ADVANCE) {
b = data[SKIP + RGB_BYTE0(RGB_ORDER)];
} else {
b = rgbdata[SKIP + RGB_BYTE0(RGB_ORDER)];
delaycycles<1>();
}
INLINE_SCALE(b, scale);
bitSetLast<5, 6>(port, hi, lo, d);
}
cleanup_R1();
#endif
#endif
}
#ifdef SUPPORT_ARGB
virtual void showARGB(struct CARGB *data, int nLeds) {
// TODO: IMPLEMENTME
}
#endif
};
#endif
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