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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 0
#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);
}
protected:
// set all the leds on the controller to a given color
virtual void showColor(const struct CRGB & rgbdata, int nLeds, CRGB scale) {
PixelController<RGB_ORDER> pixels(rgbdata, nLeds, scale, getDither());
mWait.wait();
cli();
SysClockSaver savedClock(TOTAL);
uint32_t clocks = showRGBInternal(pixels);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(clocks);
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) {
PixelController<RGB_ORDER> pixels(rgbdata, nLeds, scale, getDither());
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();
uint32_t clocks = showRGBInternal(pixels);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(clocks);
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) {
PixelController<RGB_ORDER> pixels(rgbdata, nLeds, scale, getDither());
mWait.wait();
cli();
SysClockSaver savedClock(TOTAL);
uint32_t clocks = showRGBInternal(pixels);
// Adjust the timer
long microsTaken = CLKS_TO_MICROS(clocks);
long millisTaken = (microsTaken / 1000);
savedClock.restore();
do { TimeTick_Increment(); } while(--millisTaken > 0);
sei();
mWait.mark();
}
#endif
#if 0
// Get the arm defs, register/macro defs from the k20
#define ARM_DEMCR *(volatile uint32_t *)0xE000EDFC // Debug Exception and Monitor Control
#define ARM_DEMCR_TRCENA (1 << 24) // Enable debugging & monitoring blocks
#define ARM_DWT_CTRL *(volatile uint32_t *)0xE0001000 // DWT control register
#define ARM_DWT_CTRL_CYCCNTENA (1 << 0) // Enable cycle count
#define ARM_DWT_CYCCNT *(volatile uint32_t *)0xE0001004 // Cycle count register
template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register data_ptr_t port, register uint8_t & b) {
for(register uint32_t i = BITS; i > 0; i--) {
while(ARM_DWT_CYCCNT < next_mark);
next_mark = ARM_DWT_CYCCNT + (T1+T2+T3);
*port = 1;
uint32_t flip_mark = next_mark - ((b&0x80) ? (T3) : (T2+T3));
b <<= 1;
while(ARM_DWT_CYCCNT < flip_mark);
*port = 0;
}
}
// 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.
static void showRGBInternal(PixelController<RGB_ORDER> pixels) {
register data_ptr_t port = FastPinBB<DATA_PIN>::port();
*port = 0;
// Setup the pixel controller and load/scale the first byte
pixels.preStepFirstByteDithering();
register uint8_t b = pixels.loadAndScale0();
// Get access to the clock
ARM_DEMCR |= ARM_DEMCR_TRCENA;
ARM_DWT_CTRL |= ARM_DWT_CTRL_CYCCNTENA;
ARM_DWT_CYCCNT = 0;
uint32_t next_mark = ARM_DWT_CYCCNT + (T1+T2+T3);
while(pixels.has(1)) {
pixels.stepDithering();
// Write first byte, read next byte
writeBits<8+XTRA0>(next_mark, port, b);
b = pixels.loadAndScale1();
// Write second byte, read 3rd byte
writeBits<8+XTRA0>(next_mark, port, b);
b = pixels.loadAndScale2();
// Write third byte
writeBits<8+XTRA0>(next_mark, port, b);
b = pixels.advanceAndLoadAndScale0();
};
}
#else
// 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]
#define VAL (volatile uint32_t)(*((uint32_t*)(SysTick_BASE + 8)))
template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register data_ptr_t port, register uint8_t & b) {
for(register uint32_t i = BITS; i > 0; i--) {
// wait to start the bit, then set the pin high
while(VAL > next_mark);
next_mark = (VAL-TOTAL);
*port = 1;
// how long we want to wait next depends on whether or not our bit is set to 1 or 0
if(b&0x80) {
// we're a 1, wait until there's less than T3 clocks left
while((VAL - next_mark) > (T3));
} else {
// we're a 0, wait until there's less than (T2+T3+slop) clocks left in this bit
while((VAL-next_mark) > (T2+T3+6+TADJUST+TADJUST));
}
*port=0;
b <<= 1;
}
}
#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.
static uint32_t showRGBInternal(PixelController<RGB_ORDER> & pixels) {
// Setup and start the clock
register volatile uint32_t *CTPTR asm("r6")= &SysTick->CTRL; FORCE_REFERENCE(CTPTR);
_LOAD = 0x00FFFFFF;
_VAL = 0;
_CTRL |= SysTick_CTRL_CLKSOURCE_Msk;
_CTRL |= SysTick_CTRL_ENABLE_Msk;
register data_ptr_t port asm("r7") = FastPinBB<DATA_PIN>::port(); FORCE_REFERENCE(port);
*port = 0;
// Setup the pixel controller and load/scale the first byte
pixels.preStepFirstByteDithering();
register uint8_t b = pixels.loadAndScale0();
uint32_t next_mark = (VAL - (TOTAL));
while(pixels.has(1)) {
pixels.stepDithering();
writeBits<8+XTRA0>(next_mark, port, b);
b = pixels.loadAndScale1();
writeBits<8+XTRA0>(next_mark, port,b);
b = pixels.loadAndScale2();
writeBits<8+XTRA0>(next_mark, port,b);
b = pixels.advanceAndLoadAndScale0();
};
return 0x00FFFFFF - _VAL;
}
#endif
};
#endif
#endif
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