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Fix wrong gamma correction for Module 48 lights (PWM5 for CT)

This commit is contained in:
Hadinger 2020-01-02 22:36:27 +01:00
parent 894950ca4e
commit 0ab3ba6fab
2 changed files with 29 additions and 38 deletions
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1
tasmota/CHANGELOG.md
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@ -9,6 +9,7 @@
- Fix LCD line and column positioning (#7387)
- Fix Display handling of hexadecimal escape characters (#7387)
- Fix Improved fade linearity with gamma correction
- Fix wrong gamma correction for Module 48 lights (PWM5 for CT)
### 8.1.0.1 20191225

66
tasmota/xdrv_04_light.ino
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@ -1709,9 +1709,6 @@ void LightAnimate(void)
calcGammaMultiChannels(cur_col_10);
} else {
calcGammaBulbs(cur_col_10);
if (PHILIPS == my_module_type) {
calcGammaCTPwm(cur_col_10);
}
// Now see if we need to mix RGB and True White
// Valid only for LST_RGBW, LST_RGBWC, rgbwwTable[4] is zero, and white is zero (see doc)
@ -1941,26 +1938,6 @@ void LightSetOutputs(const uint16_t *cur_col_10) {
XdrvMailbox.topic = tmp_topic;
}
// Do specific computation is SetOption73 is on, Color Temp is a separate PWM channel
void calcGammaCTPwm(uint16_t cur_col_10[5]) {
// Xiaomi Philips bulbs follow a different scheme:
uint8_t cold, warm; // channel 1 is the color tone, mapped to cold channel (0..255)
light_state.getCW(&cold, &warm);
// channels for white are always the last two channels
uint32_t cw1 = Light.subtype - 1; // address for the ColorTone PWM
uint32_t cw0 = Light.subtype - 2; // address for the White Brightness PWM
// overall brightness
uint16_t pxBri10 = cur_col_10[cw0] + cur_col_10[cw1];
if (pxBri10 > 1023) { pxBri10 = 1023; }
cur_col_10[cw1] = changeUIntScale(cold, 0, cold + warm, 0, 1023); //
// channel 0=intensity, channel1=temperature
if (Settings.light_correction) { // gamma correction
cur_col_10[cw0] = ledGamma10_10(pxBri10); // 10 bits gamma correction
} else {
cur_col_10[cw0] = pxBri10; // no gamma, extend to 10 bits
}
}
// Just apply basic Gamma to each channel
void calcGammaMultiChannels(uint16_t cur_col_10[5]) {
// Apply gamma correction for 8 and 10 bits resolutions, if needed
@ -1976,22 +1953,35 @@ void calcGammaBulbs(uint16_t cur_col_10[5]) {
if (Settings.light_correction) {
// First apply combined correction to the overall white power
if ((LST_COLDWARM == Light.subtype) || (LST_RGBWC == Light.subtype)) {
uint8_t w_idx[2] = {0, 1}; // if LST_COLDWARM, channels 0 and 1
if (LST_RGBWC == Light.subtype) { // if LST_RGBWC, channels 3 and 4
w_idx[0] = 3;
w_idx[1] = 4;
}
uint16_t white_bri10 = cur_col_10[w_idx[0]] + cur_col_10[w_idx[1]];
// if sum of both channels is > 255, then channels are probablu uncorrelated
if (white_bri10 <= 1023) {
// we calculate the gamma corrected sum of CW + WW
uint16_t white_bri_10bits = ledGamma10_10(white_bri10);
// then we split the total energy among the cold and warm leds
cur_col_10[w_idx[0]] = changeUIntScale(cur_col_10[w_idx[0]], 0, white_bri10, 0, white_bri_10bits);
cur_col_10[w_idx[1]] = changeUIntScale(cur_col_10[w_idx[1]], 0, white_bri10, 0, white_bri_10bits);
// channels for white are always the last two channels
uint32_t cw1 = Light.subtype - 1; // address for the ColorTone PWM
uint32_t cw0 = Light.subtype - 2; // address for the White Brightness PWM
uint16_t white_bri10 = cur_col_10[cw0] + cur_col_10[cw1]; // cumulated brightness
uint16_t white_bri10_1023 = (white_bri10 > 1023) ? 1023 : white_bri10; // max 1023
if (PHILIPS == my_module_type) { // channel 1 is the color tone, mapped to cold channel (0..255)
// Xiaomi Philips bulbs follow a different scheme:
uint8_t cold, warm;
light_state.getCW(&cold, &warm);
cur_col_10[cw1] = changeUIntScale(cold, 0, cold + warm, 0, 1023); //
// channel 0=intensity, channel1=temperature
if (Settings.light_correction) { // gamma correction
cur_col_10[cw0] = ledGamma10_10(white_bri10_1023); // 10 bits gamma correction
} else {
cur_col_10[cw0] = white_bri10_1023; // no gamma, extend to 10 bits
}
} else {
cur_col_10[w_idx[0]] = ledGamma10_10(cur_col_10[w_idx[0]]);
cur_col_10[w_idx[1]] = ledGamma10_10(cur_col_10[w_idx[1]]);
// if sum of both channels is > 255, then channels are probably uncorrelated
if (white_bri10 <= 1031) { // take a margin of 8 above 1023 to account for rounding errors
// we calculate the gamma corrected sum of CW + WW
uint16_t white_bri_gamma10 = ledGamma10_10(white_bri10_1023);
// then we split the total energy among the cold and warm leds
cur_col_10[cw0] = changeUIntScale(cur_col_10[cw0], 0, white_bri10_1023, 0, white_bri_gamma10);
cur_col_10[cw1] = changeUIntScale(cur_col_10[cw1], 0, white_bri10_1023, 0, white_bri_gamma10);
} else {
cur_col_10[cw0] = ledGamma10_10(cur_col_10[cw0]);
cur_col_10[cw1] = ledGamma10_10(cur_col_10[cw1]);
}
}
}
// then apply gamma correction to RGB channels