159 lines
4.6 KiB
C++
159 lines
4.6 KiB
C++
/*-------------------------------------------------------------------------
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NeoPixel library helper functions for Esp8266 and Esp32
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Written by Michael C. Miller.
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I invest time and resources providing this open source code,
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please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
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-------------------------------------------------------------------------
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This file is part of the Makuna/NeoPixelBus library.
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NeoPixelBus is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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NeoPixelBus is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with NeoPixel. If not, see
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<http://www.gnu.org/licenses/>.
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-------------------------------------------------------------------------*/
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#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
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#include <Arduino.h>
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// ESP32C3 I2S is not supported yet
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#if !defined(CONFIG_IDF_TARGET_ESP32C3)
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static inline uint32_t getCycleCount(void)
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{
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uint32_t ccount;
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__asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
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return ccount;
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}
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void IRAM_ATTR NeoEspBitBangBase_send_pixels(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
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{
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const uint32_t pinRegister = _BV(pin);
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uint8_t mask = 0x80;
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uint8_t subpix = *pixels++;
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uint32_t cyclesStart = 0; // trigger emediately
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uint32_t cyclesNext = 0;
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for (;;)
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{
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// do the checks here while we are waiting on time to pass
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uint32_t cyclesBit = t0h;
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if (subpix & mask)
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{
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cyclesBit = t1h;
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}
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// after we have done as much work as needed for this next bit
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// now wait for the HIGH
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while (((cyclesStart = getCycleCount()) - cyclesNext) < period);
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// set pin state
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#if defined(ARDUINO_ARCH_ESP32)
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GPIO.out_w1ts = pinRegister;
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#else
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
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#endif
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// wait for the LOW
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while ((getCycleCount() - cyclesStart) < cyclesBit);
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// reset pin start
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#if defined(ARDUINO_ARCH_ESP32)
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GPIO.out_w1tc = pinRegister;
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#else
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GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
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#endif
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cyclesNext = cyclesStart;
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// next bit
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mask >>= 1;
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if (mask == 0)
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{
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// no more bits to send in this byte
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// check for another byte
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if (pixels >= end)
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{
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// no more bytes to send so stop
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break;
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}
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// reset mask to first bit and get the next byte
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mask = 0x80;
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subpix = *pixels++;
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}
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}
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}
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void IRAM_ATTR NeoEspBitBangBase_send_pixels_inv(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
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{
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const uint32_t pinRegister = _BV(pin);
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uint8_t mask = 0x80;
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uint8_t subpix = *pixels++;
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uint32_t cyclesStart = 0; // trigger emediately
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uint32_t cyclesNext = 0;
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for (;;)
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{
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// do the checks here while we are waiting on time to pass
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uint32_t cyclesBit = t0h;
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if (subpix & mask)
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{
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cyclesBit = t1h;
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}
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// after we have done as much work as needed for this next bit
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// now wait for the HIGH
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while (((cyclesStart = getCycleCount()) - cyclesNext) < period);
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// set pin state
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#if defined(ARDUINO_ARCH_ESP32)
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GPIO.out_w1tc = pinRegister;
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#else
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GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
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#endif
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// wait for the LOW
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while ((getCycleCount() - cyclesStart) < cyclesBit);
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// reset pin start
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#if defined(ARDUINO_ARCH_ESP32)
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GPIO.out_w1ts = pinRegister;
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#else
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
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#endif
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cyclesNext = cyclesStart;
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// next bit
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mask >>= 1;
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if (mask == 0)
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{
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// no more bits to send in this byte
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// check for another byte
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if (pixels >= end)
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{
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// no more bytes to send so stop
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break;
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}
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// reset mask to first bit and get the next byte
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mask = 0x80;
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subpix = *pixels++;
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}
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}
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}
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#endif // !defined(CONFIG_IDF_TARGET_ESP32C3)
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#endif // defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
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