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#ifndef __INC_CLOCKLESS_ARM_SAM_H
#define __INC_CLOCKLESS_ARM_SAM_H
// Definition for a single channel clockless controller for the sam family of arm chips, like that used in the due and rfduino
// See clockless.h for detailed info on how the template parameters are used.
#if defined(__SAM3X8E__)
#define TADJUST 1
#define TOTAL ( (T1+TADJUST) + (T2+TADJUST) + (T3+TADJUST) )
#define T1_MARK (TOTAL - (T1+TADJUST))
#define T2_MARK (T1_MARK - (T2+TADJUST))
#define SCALE(S,V) scale8_video(S,V)
// #define SCALE(S,V) scale8(S,V)
template <uint8_t DATA_PIN, int T1, int T2, int T3, EOrder RGB_ORDER = RGB, int XTRA0 = 0, bool FLIP = false, int WAIT_TIME = 500>
class ClocklessController : public CLEDController {
typedef typename FastPinBB<DATA_PIN>::port_ptr_t data_ptr_t;
typedef typename FastPinBB<DATA_PIN>::port_t data_t;
data_t mPinMask;
data_ptr_t mPort;
CMinWait<WAIT_TIME> mWait;
public:
virtual void init() {
FastPinBB<DATA_PIN>::setOutput();
mPinMask = FastPinBB<DATA_PIN>::mask();
mPort = FastPinBB<DATA_PIN>::port();
}
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, CRGB scale = CRGB::White) {
mWait.wait();
cli();
SysClockSaver savedClock(TOTAL);
showRGBInternal<0, false>(nLeds, scale, (const byte*)&data);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS((long)nLeds * 8 * (TOTAL));
long millisTaken = (microsTaken / 1000);
savedClock.restore();
do { TimeTick_Increment(); } while(--millisTaken > 0);
sei();
mWait.mark();
}
virtual void show(const struct CRGB *rgbdata, int nLeds, CRGB scale = CRGB::White) {
mWait.wait();
cli();
SysClockSaver savedClock(TOTAL);
// Serial.print("Scale is ");
// Serial.print(scale.raw[0]); Serial.print(" ");
// Serial.print(scale.raw[1]); Serial.print(" ");
// Serial.print(scale.raw[2]); Serial.println(" ");
// FastPinBB<DATA_PIN>::hi(); delay(1); FastPinBB<DATA_PIN>::lo();
showRGBInternal<0, true>(nLeds, scale, (const byte*)rgbdata);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS((long)nLeds * 8 * (TOTAL));
long millisTaken = (microsTaken / 1000);
savedClock.restore();
do { TimeTick_Increment(); } while(--millisTaken > 0);
sei();
mWait.mark();
}
#ifdef SUPPORT_ARGB
virtual void show(const struct CARGB *rgbdata, int nLeds, CRGB scale = CRGB::White) {
mWait.wait();
cli();
SysClockSaver savedClock(TOTAL);
showRGBInternal<1, true>(nLeds, scale, (const byte*)rgbdata);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS((long)nLeds * 8 * (TOTAL));
long millisTaken = (microsTaken / 1000);
savedClock.restore();
do { TimeTick_Increment(); } while(--millisTaken > 0);
sei();
mWait.mark();
}
#endif
// I hate using defines for these, should find a better representation at some point
#define _CTRL CTPTR[0]
#define _LOAD CTPTR[1]
#define _VAL CTPTR[2]
__attribute__((always_inline)) static inline void wait_loop_start(register volatile uint32_t *CTPTR) {
__asm__ __volatile__ (
"L_%=: ldr.w r8, [%0]\n"
" tst.w r8, #65536\n"
" beq.n L_%=\n"
: /* no outputs */
: "r" (CTPTR)
: "r8"
);
}
template<int MARK> __attribute__((always_inline)) static inline void wait_loop_mark(register volatile uint32_t *CTPTR) {
__asm__ __volatile__ (
"L_%=: ldr.w r8, [%0, #8]\n"
" cmp.w r8, %1\n"
" bhi.n L_%=\n"
: /* no outputs */
: "r" (CTPTR), "I" (MARK)
: "r8"
);
}
__attribute__((always_inline)) static inline void mark_port(register data_ptr_t port, register int val) {
__asm__ __volatile__ (
" str.w %0, [%1]\n"
: /* no outputs */
: "r" (val), "r" (port)
);
}
#define AT_BIT_START(X) wait_loop_start(CTPTR); X;
#define AT_MARK(X) wait_loop_mark<T1_MARK>(CTPTR); { X; }
#define AT_END(X) wait_loop_mark<T2_MARK>(CTPTR); { X; }
// #define AT_BIT_START(X) while(!(_CTRL & SysTick_CTRL_COUNTFLAG_Msk)); { X; }
// #define AT_MARK(X) while(_VAL > T1_MARK); { X; }
// #define AT_END(X) while(_VAL > T2_MARK); { X; }
//#define AT_MARK(X) delayclocks_until<T1_MARK>(_VAL); X;
//#define AT_END(X) delayclocks_until<T2_MARK>(_VAL); X;
template<int MARK> __attribute__((always_inline)) static inline void delayclocks_until(register byte b) {
__asm__ __volatile__ (
" sub %0, %0, %1\n"
"L_%=: subs %0, %0, #2\n"
" bcs.n L_%=\n"
: /* no outputs */
: "r" (b), "I" (MARK)
: /* no clobbers */
);
}
template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register volatile uint32_t *CTPTR, register data_ptr_t port, register uint8_t & b) {
// 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 = BITS; i > 0; i--) {
AT_BIT_START(*port=1);
if(b&0x80) {} else { AT_MARK(*port=0); }
b <<= 1;
AT_END(*port=0);
}
}
#define FORCE_REFERENCE(var) asm volatile( "" : : "r" (var) )
// 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 CRGB scale, register const byte *rgbdata) {
register data_ptr_t port asm("r7") = FastPinBB<DATA_PIN>::port(); FORCE_REFERENCE(port);
register byte *data = (byte*)rgbdata;
register uint8_t *end = data + (nLeds*3 + SKIP);
*port = 0;
// Setup the pixel controller and load/scale the first byte
PixelController<RGB_ORDER> pixels(data, scale, true, ADVANCE, SKIP);
register uint8_t b = pixels.loadAndScale0();
// Setup and start the clock
register volatile uint32_t *CTPTR asm("r6")= &SysTick->CTRL; FORCE_REFERENCE(CTPTR);
_LOAD = TOTAL;
_VAL = 0;
_CTRL |= SysTick_CTRL_CLKSOURCE_Msk;
_CTRL |= SysTick_CTRL_ENABLE_Msk;
// read to clear the loop flag
_CTRL;
while(nLeds-- > 0) {
pixels.stepDithering();
writeBits<8+XTRA0>(CTPTR, port, b);
b = pixels.loadAndScale1();
writeBits<8+XTRA0>(CTPTR, port,b);
b = pixels.loadAndScale2();
writeBits<8+XTRA0>(CTPTR, port,b);
b = pixels.advanceAndLoadAndScale0();
};
}
};
#endif
#endif
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