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Copy pathir_Lego_PF_BitStreamEncoder.h
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115 lines (101 loc) · 3.52 KB
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//==============================================================================
// L EEEEEE EEEE OOOO
// L E E O O
// L EEEE E EEE O O
// L E E E O O LEGO Power Functions
// LLLLLL EEEEEE EEEE OOOO Copyright (c) 2016, 2017 Philipp Henkel
//==============================================================================
//+=============================================================================
//
class LegoPfBitStreamEncoder {
private:
uint16_t data;
bool repeatMessage;
uint8_t messageBitIdx;
uint8_t repeatCount;
uint16_t messageLength;
public:
// HIGH data bit = IR mark + high pause
// LOW data bit = IR mark + low pause
static const uint16_t LOW_BIT_DURATION = 421;
static const uint16_t HIGH_BIT_DURATION = 711;
static const uint16_t START_BIT_DURATION = 1184;
static const uint16_t STOP_BIT_DURATION = 1184;
static const uint8_t IR_MARK_DURATION = 158;
static const uint16_t HIGH_PAUSE_DURATION = HIGH_BIT_DURATION - IR_MARK_DURATION;
static const uint16_t LOW_PAUSE_DURATION = LOW_BIT_DURATION - IR_MARK_DURATION;
static const uint16_t START_PAUSE_DURATION = START_BIT_DURATION - IR_MARK_DURATION;
static const uint16_t STOP_PAUSE_DURATION = STOP_BIT_DURATION - IR_MARK_DURATION;
static const uint8_t MESSAGE_BITS = 18;
static const uint16_t MAX_MESSAGE_LENGTH = 16000;
void reset(uint16_t data, bool repeatMessage) {
this->data = data;
this->repeatMessage = repeatMessage;
messageBitIdx = 0;
repeatCount = 0;
messageLength = getMessageLength();
}
int getChannelId() const { return 1 + ((data >> 12) & 0x3); }
uint16_t getMessageLength() const {
// Sum up all marks
uint16_t length = MESSAGE_BITS * IR_MARK_DURATION;
// Sum up all pauses
length += START_PAUSE_DURATION;
for (unsigned long mask = 1UL << 15; mask; mask >>= 1) {
if (data & mask) {
length += HIGH_PAUSE_DURATION;
} else {
length += LOW_PAUSE_DURATION;
}
}
length += STOP_PAUSE_DURATION;
return length;
}
boolean next() {
messageBitIdx++;
if (messageBitIdx >= MESSAGE_BITS) {
repeatCount++;
messageBitIdx = 0;
}
if (repeatCount >= 1 && !repeatMessage) {
return false;
} else if (repeatCount >= 5) {
return false;
} else {
return true;
}
}
uint8_t getMarkDuration() const { return IR_MARK_DURATION; }
uint32_t getPauseDuration() const {
if (messageBitIdx == 0)
return START_PAUSE_DURATION;
else if (messageBitIdx < MESSAGE_BITS - 1) {
return getDataBitPause();
} else {
return getStopPause();
}
}
private:
uint16_t getDataBitPause() const {
const int pos = MESSAGE_BITS - 2 - messageBitIdx;
const bool isHigh = data & (1 << pos);
return isHigh ? HIGH_PAUSE_DURATION : LOW_PAUSE_DURATION;
}
uint32_t getStopPause() const {
if (repeatMessage) {
return getRepeatStopPause();
} else {
return STOP_PAUSE_DURATION;
}
}
uint32_t getRepeatStopPause() const {
if (repeatCount == 0 || repeatCount == 1) {
return STOP_PAUSE_DURATION + (uint32_t)5 * MAX_MESSAGE_LENGTH - messageLength;
} else if (repeatCount == 2 || repeatCount == 3) {
return STOP_PAUSE_DURATION
+ (uint32_t)(6 + 2 * getChannelId()) * MAX_MESSAGE_LENGTH - messageLength;
} else {
return STOP_PAUSE_DURATION;
}
}
};