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#pragma once
FASTLED_NAMESPACE_BEGIN
// Info on reading cycle counter from https://github.com/kbeckmann/nodemcu-firmware/blob/ws2812-dual/app/modules/ws2812.c
__attribute__ ((always_inline)) inline static uint32_t __clock_cycles() {
uint32_t cyc;
__asm__ __volatile__ ("rsr %0,ccount":"=a" (cyc));
return cyc;
}
#ifndef FASTLED_INTERRUPT_RETRY_COUNT
#define FASTLED_INTERRUPT_RETRY_COUNT 2
#endif
#define FASTLED_HAS_CLOCKLESS 1
template <int DATA_PIN, int T1, int T2, int T3, EOrder RGB_ORDER = RGB, int XTRA0 = 0, bool FLIP = false, int WAIT_TIME = 5>
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();
}
virtual uint16_t getMaxRefreshRate() const { return 400; }
protected:
virtual void showPixels(PixelController<RGB_ORDER> & pixels) {
// mWait.wait();
int cnt = FASTLED_INTERRUPT_RETRY_COUNT;
while(!showRGBInternal(pixels) && cnt--) {
os_intr_unlock();
delayMicroseconds(WAIT_TIME * 10);
os_intr_lock();
showRGBInternal(pixels);
}
// mWait.mark();
}
#define _ESP_ADJ (6)
template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register uint8_t b) {
for(register uint32_t i = BITS; i > 0; i--) {
while(__clock_cycles() < next_mark);
next_mark = __clock_cycles() + (T1+T2+T3 + _ESP_ADJ);
FastPin<DATA_PIN>::hi();
if(b&0x80) {
while((next_mark - __clock_cycles()) > (T3 + _ESP_ADJ));
FastPin<DATA_PIN>::lo();
} else {
while((next_mark - __clock_cycles()) > (T2+T3 + 40));
FastPin<DATA_PIN>::lo();
}
b <<= 1;
}
// while(__clock_cycles() < next_mark);
// next_mark = __clock_cycles() + (T1+T2+T3);
// FastPin<DATA_PIN>::hi();
//
// if(b&0x80) {
// while((next_mark - __clock_cycles()) > (T3+(2*(F_CPU/24000000))));
// FastPin<DATA_PIN>::lo();
// } else {
// while((next_mark - __clock_cycles()) > (T2+T3+(2*(F_CPU/24000000))));
// FastPin<DATA_PIN>::lo();
// }
}
// 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 ICACHE_RAM_ATTR showRGBInternal(PixelController<RGB_ORDER> pixels) {
// Setup the pixel controller and load/scale the first byte
pixels.preStepFirstByteDithering();
register uint8_t b = pixels.loadAndScale0();
os_intr_lock();
uint32_t start = __clock_cycles();
uint32_t next_mark = start + (T1+T2+T3 + _ESP_ADJ);
while(pixels.has(1)) {
pixels.stepDithering();
#if (FASTLED_ALLOW_INTERRUPTS == 1)
os_intr_lock();
// if interrupts took longer than 45µs, punt on the current frame
if(__clock_cycles() > next_mark) {
if((__clock_cycles()-next_mark) > ((WAIT_TIME-INTERRUPT_THRESHOLD)*CLKS_PER_US)) { sei(); return 0; }
}
#endif
// Write first byte, read next byte
writeBits<8+XTRA0>(next_mark, b);
b = pixels.loadAndScale1();
// Write second byte, read 3rd byte
writeBits<8+XTRA0>(next_mark, b);
b = pixels.loadAndScale2();
// Write third byte, read 1st byte of next pixel
writeBits<8+XTRA0>(next_mark, b);
b = pixels.advanceAndLoadAndScale0();
#if (FASTLED_ALLOW_INTERRUPTS == 1)
os_intr_unlock();
#endif
};
os_intr_unlock();
return __clock_cycles() - start;
}
};
FASTLED_NAMESPACE_END
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