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Merge pull request FastLED#993 from PaulZC/Support_for_SparkFun_Artem…
…is__Apollo3 Adding support for the SparkFun Artemis (Ambiq Micro Apollo3 Blue)
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| Original file line number | Diff line number | Diff line change |
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| #ifndef __INC_CLOCKLESS_APOLLO3_H | ||
| #define __INC_CLOCKLESS_APOLLO3_H | ||
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| FASTLED_NAMESPACE_BEGIN | ||
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| #if defined(FASTLED_APOLLO3) | ||
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| // Clockless support for the SparkFun Artemis / Ambiq Micro Apollo3 Blue | ||
| // Uses SysTick to govern the pulse timing | ||
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| //***************************************************************************** | ||
| // | ||
| // Code taken from Ambiq Micro's am_hal_systick.c | ||
| // and converted to inline static for speed | ||
| // | ||
| //! @brief Get the current count value in the SYSTICK. | ||
| //! | ||
| //! This function gets the current count value in the systick timer. | ||
| //! | ||
| //! @return Current count value. | ||
| // | ||
| //***************************************************************************** | ||
| __attribute__ ((always_inline)) inline static uint32_t __am_hal_systick_count() { | ||
| return SysTick->VAL; | ||
| } | ||
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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> | ||
| 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; | ||
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| CMinWait<WAIT_TIME> mWait; | ||
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| public: | ||
| virtual void init() { | ||
| // Initialize everything | ||
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| // Configure DATA_PIN for FastGPIO (settings are in fastpin_apollo3.h) | ||
| FastPin<DATA_PIN>::setOutput(); | ||
| FastPin<DATA_PIN>::lo(); | ||
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| // Make sure the system clock is running at the full 48MHz | ||
| am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_SYSCLK_MAX, 0); | ||
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| // Make sure interrupts are enabled | ||
| //am_hal_interrupt_master_enable(); | ||
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| // Enable SysTick Interrupts in the NVIC | ||
| //NVIC_EnableIRQ(SysTick_IRQn); | ||
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| // SysTick is 24-bit and counts down (not up) | ||
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| // Stop the SysTick (just in case it is already running). | ||
| // This clears the ENABLE bit in the SysTick Control and Status Register (SYST_CSR). | ||
| // In Ambiq naming convention, the control register is SysTick->CTRL | ||
| am_hal_systick_stop(); | ||
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| // Call SysTick_Config | ||
| // This is defined in core_cm4.h | ||
| // It loads the specified LOAD value into the SysTick Reload Value Register (SYST_RVR) | ||
| // In Ambiq naming convention, the reload register is SysTick->LOAD | ||
| // It sets the SysTick interrupt priority | ||
| // It clears the SysTick Current Value Register (SYST_CVR) | ||
| // In Ambiq naming convention, the current value register is SysTick->VAL | ||
| // Finally it sets these bits in the SysTick Control and Status Register (SYST_CSR): | ||
| // CLKSOURCE: SysTick uses the processor clock | ||
| // TICKINT: When the count reaches zero, the SysTick exception (interrupt) is changed to pending | ||
| // ENABLE: Enables the counter | ||
| // SysTick_Config returns 0 if successful. 1 indicates a failure (the LOAD value was invalid). | ||
| SysTick_Config(0xFFFFFFUL); // The LOAD value needs to be 24-bit | ||
| } | ||
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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) { | ||
| mWait.wait(); | ||
| if(!showRGBInternal(pixels)) { | ||
| sei(); delayMicroseconds(WAIT_TIME); cli(); | ||
| showRGBInternal(pixels); | ||
| } | ||
| mWait.mark(); | ||
| } | ||
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| template<int BITS> __attribute__ ((always_inline)) inline static void writeBits(register uint32_t & next_mark, register uint8_t & b) { | ||
| // SysTick counts down (not up) and is 24-bit | ||
| for(register uint32_t i = BITS-1; i > 0; i--) { // We could speed this up by using Bit Banding | ||
| while(__am_hal_systick_count() > next_mark) { ; } // Wait for the remainder of this cycle to complete | ||
| // Calculate next_mark (the time of the next DATA_PIN transition) by subtracting T1+T2+T3 | ||
| // SysTick counts down (not up) and is 24-bit | ||
| next_mark = (__am_hal_systick_count() - (T1+T2+T3)) & 0xFFFFFFUL; | ||
| FastPin<DATA_PIN>::hi(); | ||
| if(b&0x80) { | ||
| // "1 code" = longer pulse width | ||
| while((__am_hal_systick_count() - next_mark) > (T3+(3*(F_CPU/24000000)))) { ; } | ||
| FastPin<DATA_PIN>::lo(); | ||
| } else { | ||
| // "0 code" = shorter pulse width | ||
| while((__am_hal_systick_count() - next_mark) > (T2+T3+(4*(F_CPU/24000000)))) { ; } | ||
| FastPin<DATA_PIN>::lo(); | ||
| } | ||
| b <<= 1; | ||
| } | ||
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| while(__am_hal_systick_count() > next_mark) { ; }// Wait for the remainder of this cycle to complete | ||
| // Calculate next_mark (the time of the next DATA_PIN transition) by subtracting T1+T2+T3 | ||
| // SysTick counts down (not up) and is 24-bit | ||
| next_mark = (__am_hal_systick_count() - (T1+T2+T3)) & 0xFFFFFFUL; | ||
| FastPin<DATA_PIN>::hi(); | ||
| if(b&0x80) { | ||
| // "1 code" = longer pulse width | ||
| while((__am_hal_systick_count() - next_mark) > (T3+(2*(F_CPU/24000000)))) { ; } | ||
| FastPin<DATA_PIN>::lo(); | ||
| } else { | ||
| // "0 code" = shorter pulse width | ||
| while((__am_hal_systick_count() - next_mark) > (T2+T3+(4*(F_CPU/24000000)))) { ; } | ||
| FastPin<DATA_PIN>::lo(); | ||
| } | ||
| } | ||
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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 | ||
| // gcc will use register Y for the this pointer. | ||
| static uint32_t showRGBInternal(PixelController<RGB_ORDER> pixels) { | ||
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| // Setup the pixel controller and load/scale the first byte | ||
| pixels.preStepFirstByteDithering(); | ||
| register uint8_t b = pixels.loadAndScale0(); | ||
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| cli(); | ||
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| // Calculate next_mark (the time of the next DATA_PIN transition) by subtracting T1+T2+T3 | ||
| // SysTick counts down (not up) and is 24-bit | ||
| // The subtraction could underflow (wrap round) so let's mask the result to 24 bits | ||
| register uint32_t next_mark = (__am_hal_systick_count() - (T1+T2+T3)) & 0xFFFFFFUL; | ||
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| while(pixels.has(1)) { // Keep going for as long as we have pixels | ||
| pixels.stepDithering(); | ||
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| #if (FASTLED_ALLOW_INTERRUPTS == 1) | ||
| cli(); | ||
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| // Have we already missed the next_mark? | ||
| if(__am_hal_systick_count() < next_mark) { | ||
| // If we have exceeded next_mark by an excessive amount, then bail (return 0) | ||
| if((next_mark - __am_hal_systick_count()) > ((WAIT_TIME-INTERRUPT_THRESHOLD)*CLKS_PER_US)) { sei(); return 0; } | ||
| } | ||
| #endif | ||
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| // Write first byte, read next byte | ||
| writeBits<8+XTRA0>(next_mark, b); | ||
| b = pixels.loadAndScale1(); | ||
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| // Write second byte, read 3rd byte | ||
| writeBits<8+XTRA0>(next_mark, b); | ||
| b = pixels.loadAndScale2(); | ||
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| // Write third byte, read 1st byte of next pixel | ||
| writeBits<8+XTRA0>(next_mark, b); | ||
| b = pixels.advanceAndLoadAndScale0(); | ||
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| #if (FASTLED_ALLOW_INTERRUPTS == 1) | ||
| sei(); | ||
| #endif | ||
| }; // end of while(pixels.has(1)) | ||
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| // Unfortunately SysTick relies on an interrupt to reload it once it reaches zero | ||
| // and having interrupts disabled for most of the above means the interrupt doesn't get serviced. | ||
| // So we had better reload it here instead... | ||
| am_hal_systick_load(0xFFFFFFUL); | ||
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| sei(); | ||
| return (1); | ||
| } | ||
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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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| #ifndef __INC_FASTLED_APOLLO3_H | ||
| #define __INC_FASTLED_APOLLO3_H | ||
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| #include "fastpin_apollo3.h" | ||
| #include "fastspi_apollo3.h" | ||
| #include "clockless_apollo3.h" | ||
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| #endif |
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