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Remove ledc_set_duty_and_update

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Add semaphoring
Determine CCT overlap
This commit is contained in:
Blaz Kristan 2024-09-01 11:43:22 +02:00
parent 0d035a08d6
commit 2ca034bfa8
1 changed files with 30 additions and 24 deletions
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54
wled00/bus_manager.cpp
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@ -7,6 +7,9 @@
#ifdef ARDUINO_ARCH_ESP32
#include "driver/ledc.h"
#include "soc/ledc_struct.h"
#define LEDC_MUTEX_LOCK() do {} while (xSemaphoreTake(_ledc_sys_lock, portMAX_DELAY) != pdPASS)
#define LEDC_MUTEX_UNLOCK() xSemaphoreGive(_ledc_sys_lock)
extern xSemaphoreHandle _ledc_sys_lock;
#endif
#include "const.h"
#include "pin_manager.h"
@ -506,8 +509,9 @@ void BusPwm::show() {
const unsigned numPins = getPins();
const unsigned maxBri = (1<<_depth); // possible values: 16384 (14), 8192 (13), 4096 (12), 2048 (11), 1024 (10), 512 (9) and 256 (8)
// use CIE brightness formula to fit (or approximate linearity of) human eye perceived brightness
// use CIE brightness formula (cubic) to fit (or approximate linearity of) human eye perceived brightness
// the formula is based on 12 bit resolution as there is no need for greater precision
// see: https://en.wikipedia.org/wiki/Lightness
unsigned pwmBri = (unsigned)_bri * 100; // enlarge to use integer math for linear response
if (pwmBri < 2040) {
// linear response for values [0-20]
@ -527,39 +531,41 @@ void BusPwm::show() {
// phase shifting is only mandatory when using H-bridge to drive reverse-polarity PWM CCT (2 wire) LED type (with 180° phase)
// CCT additive blending must be 0 (WW & CW must not overlap) in such case
// for all other cases it will just try to "spread" the load on PSU
bool cctOverlap = (_type == TYPE_ANALOG_2CH) && (_data[0]+_data[1] >= 254);
// if _needsRefresh is true (UI hack) we are using dithering (credit @dedehai & @zalatnaicsongor)
// https://github.com/Aircoookie/WLED/pull/4115 and https://github.com/zalatnaicsongor/WLED/pull/1)
bool dithering = _needsRefresh; // avoid working with bitfield
for (unsigned i = 0; i < numPins; i++) {
unsigned scaled = (_data[i] * pwmBri) / 255;
unsigned scaled = (_data[i] * pwmBri) / 255; // scaled is at 12 bit depth (same as pwmBri)
// adjust "scaled" value (to fit resolution bounds)
if (_depth < 12 && !_needsRefresh) scaled >>= 12 - _depth; // normalize scaled value (if not using dithering)
else if (_depth > 12) scaled <<= _depth - 12; // scale to _depth if using >12 bit
if (_reversed) scaled = maxBri - scaled;
if (_depth < 12 && !dithering) scaled >>= 12 - _depth; // normalize scaled value (if not using dithering)
else if (_depth > 12) scaled <<= _depth - 12; // scale to _depth if using >12 bit
if (_reversed) scaled = maxBri - scaled;
// scaled is now at _depth resolution (8-14 bits) except when using dithering, 12 bit in such case
#ifdef ESP8266
analogWrite(_pins[i], scaled);
#else
unsigned channel = _ledcStart + i;
if (_type == TYPE_ANALOG_2CH && Bus::getCCTBlend() == 0) {
// pinManager will make sure both LEDC channels are in the same speed group and sharing the same timer
unsigned briLimit = phaseOffset << (_needsRefresh*4); // expand limit if using dithering (_depth==8, scaled is at 12 bit)
if (scaled >= briLimit) scaled = briLimit - 1; // safety check & 1 pulse dead time when brightness is at 50%
// prevent overlapping PWM signals for H-bridge
// pinManager will make sure both LEDC channels are in the same speed group and sharing the same timer
// so we only need to take care of shortening the signal at 50% distribution for 1 pulse
if (cctOverlap && Bus::getCCTBlend() == 0) {
unsigned shift = (dithering*4);
unsigned briLimit = phaseOffset << shift; // expand limit if using dithering
if (scaled >= briLimit) scaled = briLimit - (1<<shift); // safety check & 1 pulse dead time when brightness is at 50%
}
unsigned gr = channel/8; // high/low speed group
unsigned ch = channel%8; // group channel
if (_needsRefresh) {
// if _needsRefresh is true (UI hack) we are using dithering (credit @dedehai & @zalatnaicsongor)
// https://github.com/Aircoookie/WLED/pull/4115 and https://github.com/zalatnaicsongor/WLED/pull/1)
// directly write to LEDC struct as there is no HAL exposed function for dithering
// duty has 20 bit resolution with 4 fractional bits (24 bits in total)
// _depth is 8 bit in this case (and maxBri==256), scaled is still at 12 bit
LEDC.channel_group[gr].channel[ch].duty.duty = scaled; // write full 12 bit value (4 dithering bits)
LEDC.channel_group[gr].channel[ch].hpoint.hpoint = phaseOffset*i; // phaseOffset is at _depth resolution (8 bit)
ledc_update_duty((ledc_mode_t)gr, (ledc_channel_t)ch);
} else {
// scaled will be [0-((1<<_depth)-1)] and hpoint evenly distributed
ledc_set_duty_and_update((ledc_mode_t)gr, (ledc_channel_t)ch, scaled, phaseOffset*i);
//ledcWrite(channel, scaled);
}
// directly write to LEDC struct as there is no HAL exposed function for dithering
// duty has 20 bit resolution with 4 fractional bits (24 bits in total)
// _depth is 8 bit in this case (and maxBri==256), scaled is still at 12 bit
LEDC_MUTEX_LOCK();
LEDC.channel_group[gr].channel[ch].duty.duty = scaled << ((!dithering)*4); // write full 12 bit value (4 dithering bits)
LEDC.channel_group[gr].channel[ch].hpoint.hpoint = phaseOffset*i; // phaseOffset is at _depth resolution (8 bit)
LEDC_MUTEX_UNLOCK();
ledc_update_duty((ledc_mode_t)gr, (ledc_channel_t)ch);
#endif
}
}