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#ifndef __INC_CLOCKLESS_ARM_MXRT1062_H
#define __INC_CLOCKLESS_ARM_MXRT1062_H
FASTLED_NAMESPACE_BEGIN
// Definition for a single channel clockless controller for the teensy4
// See clockless.h for detailed info on how the template parameters are used.
#if defined(FASTLED_TEENSY4)
#define FASTLED_HAS_CLOCKLESS 1
#define _FASTLED_NS_TO_DWT(_NS) (((F_CPU_ACTUAL>>16)*(_NS)) / (1000000000UL>>16))
template <int DATA_PIN, int T1, int T2, int T3, EOrder RGB_ORDER = RGB, int XTRA0 = 0, bool FLIP = false, int WAIT_TIME = 50>
class ClocklessController : public CPixelLEDController<RGB_ORDER> {
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();
FastPin<DATA_PIN>::lo();
}
protected:
virtual void showPixels(PixelController<RGB_ORDER> & pixels) {
mWait.wait();
if(!showRGBInternal(pixels)) {
sei(); delayMicroseconds(WAIT_TIME); cli();
showRGBInternal(pixels);
}
mWait.mark();
}
template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register uint32_t off1, register uint32_t off2, register uint32_t off3, register uint32_t & b) {
for(register uint32_t i = BITS-1; i > 0; i--) {
while(ARM_DWT_CYCCNT < next_mark);
next_mark = ARM_DWT_CYCCNT + off1;
FastPin<DATA_PIN>::hi();
if(b&0x80) {
while((next_mark - ARM_DWT_CYCCNT) > off2);
FastPin<DATA_PIN>::lo();
} else {
while((next_mark - ARM_DWT_CYCCNT) > off3);
FastPin<DATA_PIN>::lo();
}
b <<= 1;
}
while(ARM_DWT_CYCCNT < next_mark);
next_mark = ARM_DWT_CYCCNT + off1;
FastPin<DATA_PIN>::hi();
if(b&0x80) {
while((next_mark - ARM_DWT_CYCCNT) > off2);
FastPin<DATA_PIN>::lo();
} else {
while((next_mark - ARM_DWT_CYCCNT) > off3);
FastPin<DATA_PIN>::lo();
}
}
uint32_t showRGBInternal(PixelController<RGB_ORDER> pixels) {
// Setup the pixel controller and load/scale the first byte
pixels.preStepFirstByteDithering();
register uint32_t b = pixels.loadAndScale0();
cli();
uint32_t off1 = _FASTLED_NS_TO_DWT(T1+T2+T3);
uint32_t off2 = _FASTLED_NS_TO_DWT(T3);
uint32_t off3 = _FASTLED_NS_TO_DWT(T2+T3);
uint32_t wait_off = _FASTLED_NS_TO_DWT((WAIT_TIME-INTERRUPT_THRESHOLD));
uint32_t next_mark = ARM_DWT_CYCCNT + off1;
while(pixels.has(1)) {
pixels.stepDithering();
#if (FASTLED_ALLOW_INTERRUPTS == 1)
cli();
// if interrupts took longer than 45µs, punt on the current frame
if(ARM_DWT_CYCCNT > next_mark) {
if((ARM_DWT_CYCCNT-next_mark) > wait_off) { sei(); return 0; }
}
#endif
// Write first byte, read next byte
writeBits<8+XTRA0>(next_mark, off1, off2, off3, b);
b = pixels.loadAndScale1();
// Write second byte, read 3rd byte
writeBits<8+XTRA0>(next_mark, off1, off2, off3, b);
b = pixels.loadAndScale2();
// Write third byte, read 1st byte of next pixel
writeBits<8+XTRA0>(next_mark, off1, off2, off3, b);
b = pixels.advanceAndLoadAndScale0();
#if (FASTLED_ALLOW_INTERRUPTS == 1)
sei();
#endif
};
sei();
return ARM_DWT_CYCCNT;
}
};
#endif
FASTLED_NAMESPACE_END
#endif
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