118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
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#pragma once
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FASTLED_NAMESPACE_BEGIN
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#ifdef FASTLED_DEBUG_COUNT_FRAME_RETRIES
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extern uint32_t _frame_cnt;
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extern uint32_t _retry_cnt;
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#endif
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// Info on reading cycle counter from https://github.com/kbeckmann/nodemcu-firmware/blob/ws2812-dual/app/modules/ws2812.c
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__attribute__ ((always_inline)) inline static uint32_t __clock_cycles() {
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uint32_t cyc;
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__asm__ __volatile__ ("rsr %0,ccount":"=a" (cyc));
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return cyc;
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}
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#define FASTLED_HAS_CLOCKLESS 1
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template <int DATA_PIN, int T1, int T2, int T3, EOrder RGB_ORDER = RGB, int XTRA0 = 0, bool FLIP = false, int WAIT_TIME = 50>
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class ClocklessController : public CPixelLEDController<RGB_ORDER> {
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typedef typename FastPin<DATA_PIN>::port_ptr_t data_ptr_t;
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typedef typename FastPin<DATA_PIN>::port_t data_t;
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data_t mPinMask;
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data_ptr_t mPort;
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CMinWait<WAIT_TIME> mWait;
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public:
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virtual void init() {
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FastPin<DATA_PIN>::setOutput();
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mPinMask = FastPin<DATA_PIN>::mask();
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mPort = FastPin<DATA_PIN>::port();
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}
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virtual uint16_t getMaxRefreshRate() const { return 400; }
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protected:
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virtual void showPixels(PixelController<RGB_ORDER> & pixels) {
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// mWait.wait();
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int cnt = FASTLED_INTERRUPT_RETRY_COUNT;
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while((showRGBInternal(pixels)==0) && cnt--) {
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#ifdef FASTLED_DEBUG_COUNT_FRAME_RETRIES
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_retry_cnt++;
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#endif
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os_intr_unlock();
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delayMicroseconds(WAIT_TIME);
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os_intr_lock();
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}
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// mWait.mark();
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}
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#define _ESP_ADJ (0)
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#define _ESP_ADJ2 (0)
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template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & last_mark, register uint32_t b) {
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b = ~b; b <<= 24;
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for(register uint32_t i = BITS; i > 0; i--) {
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while((__clock_cycles() - last_mark) < (T1+T2+T3));
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last_mark = __clock_cycles();
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FastPin<DATA_PIN>::hi();
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while((__clock_cycles() - last_mark) < T1);
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if(b & 0x80000000L) { FastPin<DATA_PIN>::lo(); }
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b <<= 1;
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while((__clock_cycles() - last_mark) < (T1+T2));
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FastPin<DATA_PIN>::lo();
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}
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}
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// This method is made static to force making register Y available to use for data on AVR - if the method is non-static, then
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// gcc will use register Y for the this pointer.
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static uint32_t ICACHE_RAM_ATTR showRGBInternal(PixelController<RGB_ORDER> pixels) {
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// Setup the pixel controller and load/scale the first byte
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pixels.preStepFirstByteDithering();
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register uint32_t b = pixels.loadAndScale0();
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pixels.preStepFirstByteDithering();
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os_intr_lock();
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uint32_t start = __clock_cycles();
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uint32_t last_mark = start;
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while(pixels.has(1)) {
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// Write first byte, read next byte
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writeBits<8+XTRA0>(last_mark, b);
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b = pixels.loadAndScale1();
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// Write second byte, read 3rd byte
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writeBits<8+XTRA0>(last_mark, b);
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b = pixels.loadAndScale2();
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// Write third byte, read 1st byte of next pixel
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writeBits<8+XTRA0>(last_mark, b);
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b = pixels.advanceAndLoadAndScale0();
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#if (FASTLED_ALLOW_INTERRUPTS == 1)
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os_intr_unlock();
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#endif
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pixels.stepDithering();
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#if (FASTLED_ALLOW_INTERRUPTS == 1)
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os_intr_lock();
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// if interrupts took longer than 45µs, punt on the current frame
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if((int32_t)(__clock_cycles()-last_mark) > 0) {
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if((int32_t)(__clock_cycles()-last_mark) > (T1+T2+T3+((WAIT_TIME-INTERRUPT_THRESHOLD)*CLKS_PER_US))) { sei(); return 0; }
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}
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#endif
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};
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os_intr_unlock();
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#ifdef FASTLED_DEBUG_COUNT_FRAME_RETRIES
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_frame_cnt++;
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#endif
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return __clock_cycles() - start;
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}
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};
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FASTLED_NAMESPACE_END
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