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ESP32 force bitbang in IRAM (#446)

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* ESP32 force bitbang in IRAM

* Split send_pixels into inverted and non-inverted

Co-authored-by: Stephan Hadinger <stephan.hadinger@gmail.com>
This commit is contained in:
s-hadinger
2021-03-14 00:42:01 +01:00
committed by GitHub
parent dccf8d5709
commit f16a39f7af
2 changed files with 163 additions and 85 deletions
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154
src/internal/NeoEspBitBangMethod.cpp Normal file
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@@ -0,0 +1,154 @@
/*-------------------------------------------------------------------------
NeoPixel library helper functions for Esp8266 and Esp32
Written by Michael C. Miller.
I invest time and resources providing this open source code,
please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
-------------------------------------------------------------------------
This file is part of the Makuna/NeoPixelBus library.
NeoPixelBus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
NeoPixelBus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with NeoPixel. If not, see
<http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------*/
#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
#include <Arduino.h>
static inline uint32_t getCycleCount(void)
{
uint32_t ccount;
__asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
return ccount;
}
void ICACHE_RAM_ATTR NeoEspBitBangBase_send_pixels(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
{
const uint32_t pinRegister = _BV(pin);
uint8_t mask = 0x80;
uint8_t subpix = *pixels++;
uint32_t cyclesStart = 0; // trigger emediately
uint32_t cyclesNext = 0;
for (;;)
{
// do the checks here while we are waiting on time to pass
uint32_t cyclesBit = t0h;
if (subpix & mask)
{
cyclesBit = t1h;
}
// after we have done as much work as needed for this next bit
// now wait for the HIGH
while (((cyclesStart = getCycleCount()) - cyclesNext) < period);
// set pin state
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1ts = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
#endif
// wait for the LOW
while ((getCycleCount() - cyclesStart) < cyclesBit);
// reset pin start
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1tc = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
#endif
cyclesNext = cyclesStart;
// next bit
mask >>= 1;
if (mask == 0)
{
// no more bits to send in this byte
// check for another byte
if (pixels >= end)
{
// no more bytes to send so stop
break;
}
// reset mask to first bit and get the next byte
mask = 0x80;
subpix = *pixels++;
}
}
}
void ICACHE_RAM_ATTR NeoEspBitBangBase_send_pixels_inv(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
{
const uint32_t pinRegister = _BV(pin);
uint8_t mask = 0x80;
uint8_t subpix = *pixels++;
uint32_t cyclesStart = 0; // trigger emediately
uint32_t cyclesNext = 0;
for (;;)
{
// do the checks here while we are waiting on time to pass
uint32_t cyclesBit = t0h;
if (subpix & mask)
{
cyclesBit = t1h;
}
// after we have done as much work as needed for this next bit
// now wait for the HIGH
while (((cyclesStart = getCycleCount()) - cyclesNext) < period);
// set pin state
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1tc = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
#endif
// wait for the LOW
while ((getCycleCount() - cyclesStart) < cyclesBit);
// reset pin start
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1ts = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
#endif
cyclesNext = cyclesStart;
// next bit
mask >>= 1;
if (mask == 0)
{
// no more bits to send in this byte
// check for another byte
if (pixels >= end)
{
// no more bytes to send so stop
break;
}
// reset mask to first bit and get the next byte
mask = 0x80;
subpix = *pixels++;
}
}
}
#endif

94
src/internal/NeoEspBitBangMethod.h
View File

@@ -87,27 +87,17 @@ public:
const static uint32_t Period = (F_CPU / 606061 - CYCLES_LOOPTEST); // 1.65us
};
extern void NeoEspBitBangBase_send_pixels(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period);
extern void NeoEspBitBangBase_send_pixels_inv(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period);
class NeoEspPinset
{
public:
const static uint8_t IdleLevel = LOW;
inline static void setPin(const uint32_t pinRegister)
inline static void send_pixels_impl(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
{
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1ts = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
#endif
}
inline static void resetPin(const uint32_t pinRegister)
{
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1tc = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
#endif
NeoEspBitBangBase_send_pixels(pixels, end, pin, t0h, t1h, period);
}
};
@@ -116,84 +106,18 @@ class NeoEspPinsetInverted
public:
const static uint8_t IdleLevel = HIGH;
inline static void setPin(const uint32_t pinRegister)
inline static void send_pixels_impl(uint8_t* pixels, uint8_t* end, uint8_t pin, uint32_t t0h, uint32_t t1h, uint32_t period)
{
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1tc = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
#endif
}
inline static void resetPin(const uint32_t pinRegister)
{
#if defined(ARDUINO_ARCH_ESP32)
GPIO.out_w1ts = pinRegister;
#else
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
#endif
NeoEspBitBangBase_send_pixels_inv(pixels, end, pin, t0h, t1h, period);
}
};
template<typename T_SPEED, typename T_PINSET> class NeoEspBitBangBase
{
public:
__attribute__((noinline)) static void ICACHE_RAM_ATTR send_pixels(uint8_t* pixels, uint8_t* end, uint8_t pin)
static void send_pixels(uint8_t* pixels, uint8_t* end, uint8_t pin)
{
const uint32_t pinRegister = _BV(pin);
uint8_t mask = 0x80;
uint8_t subpix = *pixels++;
uint32_t cyclesStart = 0; // trigger emediately
uint32_t cyclesNext = 0;
for (;;)
{
// do the checks here while we are waiting on time to pass
uint32_t cyclesBit = T_SPEED::T0H;
if (subpix & mask)
{
cyclesBit = T_SPEED::T1H;
}
// after we have done as much work as needed for this next bit
// now wait for the HIGH
while (((cyclesStart = getCycleCount()) - cyclesNext) < T_SPEED::Period);
// set pin state
T_PINSET::setPin(pinRegister);
// wait for the LOW
while ((getCycleCount() - cyclesStart) < cyclesBit);
// reset pin start
T_PINSET::resetPin(pinRegister);
cyclesNext = cyclesStart;
// next bit
mask >>= 1;
if (mask == 0)
{
// no more bits to send in this byte
// check for another byte
if (pixels >= end)
{
// no more bytes to send so stop
break;
}
// reset mask to first bit and get the next byte
mask = 0x80;
subpix = *pixels++;
}
}
}
protected:
static inline uint32_t getCycleCount(void)
{
uint32_t ccount;
__asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
return ccount;
T_PINSET::send_pixels_impl(pixels, end, pin, T_SPEED::T0H, T_SPEED::T1H, T_SPEED::Period);
}
};