diff options
Diffstat (limited to 'src/platforms/arm/mxrt1062/clockless_arm_mxrt1062.h')
| -rw-r--r-- | src/platforms/arm/mxrt1062/clockless_arm_mxrt1062.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/platforms/arm/mxrt1062/clockless_arm_mxrt1062.h b/src/platforms/arm/mxrt1062/clockless_arm_mxrt1062.h new file mode 100644 index 00000000..ed3be816 --- /dev/null +++ b/src/platforms/arm/mxrt1062/clockless_arm_mxrt1062.h @@ -0,0 +1,131 @@ +#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; + uint32_t off[3]; + +public: + static constexpr int __DATA_PIN() { return DATA_PIN; } + static constexpr int __T1() { return T1; } + static constexpr int __T2() { return T2; } + static constexpr int __T3() { return T3; } + static constexpr EOrder __RGB_ORDER() { return RGB_ORDER; } + static constexpr int __XTRA0() { return XTRA0; } + static constexpr bool __FLIP() { return FLIP; } + static constexpr int __WAIT_TIME() { return WAIT_TIME; } + + virtual void init() { + FastPin<DATA_PIN>::setOutput(); + mPinMask = FastPin<DATA_PIN>::mask(); + mPort = FastPin<DATA_PIN>::port(); + FastPin<DATA_PIN>::lo(); + } + + virtual uint16_t getMaxRefreshRate() const { return 400; } + +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 void writeBits(register uint32_t & next_mark, 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 + off[0]; + FastPin<DATA_PIN>::hi(); + if(b&0x80) { + while((next_mark - ARM_DWT_CYCCNT) > off[1]); + FastPin<DATA_PIN>::lo(); + } else { + while((next_mark - ARM_DWT_CYCCNT) > off[2]); + FastPin<DATA_PIN>::lo(); + } + b <<= 1; + } + + while(ARM_DWT_CYCCNT < next_mark); + next_mark = ARM_DWT_CYCCNT + off[1]; + FastPin<DATA_PIN>::hi(); + + if(b&0x80) { + while((next_mark - ARM_DWT_CYCCNT) > off[2]); + FastPin<DATA_PIN>::lo(); + } else { + while((next_mark - ARM_DWT_CYCCNT) > off[2]); + FastPin<DATA_PIN>::lo(); + } + } + + uint32_t showRGBInternal(PixelController<RGB_ORDER> pixels) { + uint32_t start = ARM_DWT_CYCCNT; + + // Setup the pixel controller and load/scale the first byte + pixels.preStepFirstByteDithering(); + register uint32_t b = pixels.loadAndScale0(); + + cli(); + + off[0] = _FASTLED_NS_TO_DWT(T1+T2+T3); + off[1] = _FASTLED_NS_TO_DWT(T2+T3); + off[2] = _FASTLED_NS_TO_DWT(T3); + + uint32_t wait_off = _FASTLED_NS_TO_DWT((WAIT_TIME-INTERRUPT_THRESHOLD)); + + uint32_t next_mark = ARM_DWT_CYCCNT + off[0]; + + 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 ARM_DWT_CYCCNT - start; } + } + #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) + sei(); + #endif + }; + + sei(); + return ARM_DWT_CYCCNT - start; + } +}; +#endif + +FASTLED_NAMESPACE_END + +#endif |