121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
#ifndef __INC_CLOCKLESS_ARM_SAM_H
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#define __INC_CLOCKLESS_ARM_SAM_H
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FASTLED_NAMESPACE_BEGIN
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// Definition for a single channel clockless controller for the sam family of arm chips, like that used in the due and rfduino
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// See clockless.h for detailed info on how the template parameters are used.
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#if defined(__SAM3X8E__)
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#define TADJUST 0
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#define TOTAL ( (T1+TADJUST) + (T2+TADJUST) + (T3+TADJUST) )
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#define FASTLED_HAS_CLOCKLESS 1
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template <uint8_t 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 FastPinBB<DATA_PIN>::port_ptr_t data_ptr_t;
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typedef typename FastPinBB<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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FastPinBB<DATA_PIN>::setOutput();
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mPinMask = FastPinBB<DATA_PIN>::mask();
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mPort = FastPinBB<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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if(!showRGBInternal(pixels)) {
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sei(); delayMicroseconds(WAIT_TIME); cli();
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showRGBInternal(pixels);
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}
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mWait.mark();
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}
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template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register data_ptr_t port, register uint8_t & b) {
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// Make sure we don't slot into a wrapping spot, this will delay up to 12.5µs for WS2812
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// bool bShift=0;
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// while(VAL < (TOTAL*10)) { bShift=true; }
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// if(bShift) { next_mark = (VAL-TOTAL); };
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for(register uint32_t i = BITS; i > 0; i--) {
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// wait to start the bit, then set the pin high
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while(DUE_TIMER_VAL < next_mark);
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next_mark = (DUE_TIMER_VAL+TOTAL);
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*port = 1;
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// how long we want to wait next depends on whether or not our bit is set to 1 or 0
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if(b&0x80) {
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// we're a 1, wait until there's less than T3 clocks left
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while((next_mark - DUE_TIMER_VAL) > (T3));
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} else {
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// we're a 0, wait until there's less than (T2+T3+slop) clocks left in this bit
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while((next_mark - DUE_TIMER_VAL) > (T2+T3+6+TADJUST+TADJUST));
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}
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*port=0;
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b <<= 1;
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}
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}
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#define FORCE_REFERENCE(var) asm volatile( "" : : "r" (var) )
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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 showRGBInternal(PixelController<RGB_ORDER> pixels) {
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// Setup and start the clock
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TC_Configure(DUE_TIMER,DUE_TIMER_CHANNEL,TC_CMR_TCCLKS_TIMER_CLOCK1);
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pmc_enable_periph_clk(DUE_TIMER_ID);
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TC_Start(DUE_TIMER,DUE_TIMER_CHANNEL);
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register data_ptr_t port asm("r7") = FastPinBB<DATA_PIN>::port(); FORCE_REFERENCE(port);
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*port = 0;
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// Setup the pixel controller and load/scale the first byte
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pixels.preStepFirstByteDithering();
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uint8_t b = pixels.loadAndScale0();
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uint32_t next_mark = (DUE_TIMER_VAL + (TOTAL));
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while(pixels.has(1)) {
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pixels.stepDithering();
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#if (FASTLED_ALLOW_INTERRUPTS == 1)
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cli();
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if(DUE_TIMER_VAL > next_mark) {
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if((DUE_TIMER_VAL - next_mark) > ((WAIT_TIME-INTERRUPT_THRESHOLD)*CLKS_PER_US)) { sei(); TC_Stop(DUE_TIMER,DUE_TIMER_CHANNEL); return 0; }
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}
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#endif
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writeBits<8+XTRA0>(next_mark, port, b);
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b = pixels.loadAndScale1();
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writeBits<8+XTRA0>(next_mark, port,b);
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b = pixels.loadAndScale2();
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writeBits<8+XTRA0>(next_mark, port,b);
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b = pixels.advanceAndLoadAndScale0();
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#if (FASTLED_ALLOW_INTERRUPTS == 1)
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sei();
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#endif
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};
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TC_Stop(DUE_TIMER,DUE_TIMER_CHANNEL);
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return DUE_TIMER_VAL;
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}
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};
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#endif
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FASTLED_NAMESPACE_END
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#endif
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