BOBtheBlinker/android_device_oneplus_dre
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sdm845-common: Improve LED ramp generation algorithm.

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Distribute ramp duration equally to both on and off time, use more
ramp steps (16 instead of 8) and lower green brightness to better match
brightness of red and blue (green LED is much brighter than the other
two).

Change-Id: I48d94b4020515a5cbb15486f8d44dd151b475ab0
This commit is contained in:
Danny Baumann 2018-07-08 14:57:35 +02:00
parent c162e21253
commit 646a48d17f
2 changed files with 23 additions and 17 deletions
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37
lights/Light.cpp
View file

@ -24,8 +24,6 @@
#include <android-base/stringprintf.h>
#include <fstream>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
namespace android {
namespace hardware {
namespace light {
@ -89,26 +87,29 @@ void Light::handleRgb(const LightState& state, size_t index) {
std::map<std::string, int> colorValues;
colorValues["red"] = (stateToUse.color >> 16) & 0xff;
colorValues["green"] = (stateToUse.color >> 8) & 0xff;
// lower green brightness to adjust for the (lower) brightness of red and blue
colorValues["green"] = ((stateToUse.color >> 8) & 0xff) / 2;
colorValues["blue"] = stateToUse.color & 0xff;
int onMs = stateToUse.flashMode == Flash::TIMED ? stateToUse.flashOnMs : 0;
int offMs = stateToUse.flashMode == Flash::TIMED ? stateToUse.flashOffMs : 0;
static constexpr int kRampSize = 8;
static constexpr int kBrightnessRamp[] = { 0, 12, 25, 37, 50, 72, 85, 100 };
static constexpr int kRampStepDuration = 50;
// LUT has 63 entries, we could theoretically use them as 3 (colors) * 21 (steps).
// However, the last LUT entries don't seem to behave correctly for unknown
// reasons, so we use 17 steps for a total of 51 LUT entries only.
static constexpr int kRampSteps = 16;
static constexpr int kRampMaxStepDurationMs = 15;
auto makeLedPath = [](const std::string& led, const std::string& op) -> std::string {
return "/sys/class/leds/" + led + "/" + op;
};
auto getScaledDutyPercent = [](int brightness) -> std::string {
std::string output;
for (size_t i = 0; i < ARRAY_SIZE(kBrightnessRamp); i++) {
for (int i = 0; i <= kRampSteps; i++) {
if (i != 0) {
output += ",";
}
output += std::to_string(kBrightnessRamp[i] * brightness / 255);
output += std::to_string(i * 512 * brightness / (255 * kRampSteps));
}
return output;
};
@ -119,23 +120,25 @@ void Light::handleRgb(const LightState& state, size_t index) {
}
if (onMs > 0 && offMs > 0) {
int pauseHi, stepDuration;
if (kRampStepDuration * kRampSize * 2 > onMs) {
stepDuration = onMs / 2 * kRampSize;
int pauseLo, pauseHi, stepDuration, index = 0;
if (kRampMaxStepDurationMs * kRampSteps > onMs) {
stepDuration = onMs / kRampSteps;
pauseHi = 0;
pauseLo = offMs;
} else {
stepDuration = kRampStepDuration;
pauseHi = onMs - 2 * kRampSize * stepDuration;
stepDuration = kRampMaxStepDurationMs;
pauseHi = onMs - kRampSteps * stepDuration;
pauseLo = offMs - kRampSteps * stepDuration;
}
for (const auto& entry : colorValues) {
set(makeLedPath(entry.first, "start_idx"), 0);
set(makeLedPath(entry.first, "lut_flags"), 95);
set(makeLedPath(entry.first, "start_idx"), index);
set(makeLedPath(entry.first, "duty_pcts"), getScaledDutyPercent(entry.second));
set(makeLedPath(entry.first, "pause_lo"), offMs);
// The led driver is configured to ramp up then ramp
// down the lut. This effectively doubles the ramp duration.
set(makeLedPath(entry.first, "pause_lo"), pauseLo);
set(makeLedPath(entry.first, "pause_hi"), pauseHi);
set(makeLedPath(entry.first, "ramp_step_ms"), stepDuration);
index += kRampSteps + 1;
}
// Start blinking

3
lights/android.hardware.light@2.0-service.oneplus_sdm845.rc
View file

@ -2,6 +2,9 @@ on boot
chown system system /sys/class/leds/red/start_idx
chown system system /sys/class/leds/green/start_idx
chown system system /sys/class/leds/blue/start_idx
chown system system /sys/class/leds/red/lut_flags
chown system system /sys/class/leds/green/lut_flags
chown system system /sys/class/leds/blue/lut_flags
service light-hal-2-0 /system/bin/hw/android.hardware.light@2.0-service.oneplus_sdm845
class hal