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Performance improvements in function DCC::issueReminders

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Function issueReminders was taking around 1700us to complete.  It has been refactored to optimise calculations and reduce the amount of the loco table that needs to be scanned each time.  It now takes typically under 50us to execute.
This commit is contained in:
Neil McKechnie
2022-11-22 17:24:11 +00:00
parent 70203c3733
commit 644cb29a3a
2 changed files with 19 additions and 28 deletions
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44
DCC.cpp
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@@ -589,36 +589,24 @@ byte DCC::loopStatus=0;
void DCC::loop() {
TrackManager::loop(); // power overload checks
bitSet(DDRE, 4);
bitSet(PORTE, 4);
issueReminders();
bitClear(PORTE, 4);
}
void DCC::issueReminders() {
// if the main track transmitter still has a pending packet, skip this time around.
if ( DCCWaveform::mainTrack.getPacketPending()) return;
// This loop searches for a loco in the speed table starting at nextLoco and cycling back around
/*
for (int reg=0;reg<MAX_LOCOS;reg++) {
int slot=reg+nextLoco;
if (slot>=MAX_LOCOS) slot-=MAX_LOCOS;
if (speedTable[slot].loco > 0) {
// have found the next loco to remind
// issueReminder will return true if this loco is completed (ie speed and functions)
if (issueReminder(slot)) nextLoco=slot+1;
return;
}
}
*/
for (int reg=nextLoco;reg<MAX_LOCOS+nextLoco;reg++) {
int slot=reg%MAX_LOCOS;
if (speedTable[slot].loco > 0) {
// have found the next loco to remind
// issueReminder will return true if this loco is completed (ie speed and functions)
if (issueReminder(slot))
nextLoco=(slot+1)%MAX_LOCOS;
return;
}
}
// Move to next loco slot. If occupied, send a reminder.
int reg = lastLocoReminder+1;
if (reg > highestUsedReg) reg = 0; // Go to start of table
if (speedTable[reg].loco > 0) {
// have found loco to remind
if (issueReminder(reg))
lastLocoReminder = reg;
} else
lastLocoReminder = reg;
}
bool DCC::issueReminder(int reg) {
@@ -698,6 +686,7 @@ int DCC::lookupSpeedTable(int locoId, bool autoCreate) {
speedTable[reg].groupFlags=0;
speedTable[reg].functions=0;
}
if (reg > highestUsedReg) highestUsedReg = reg;
return reg;
}
@@ -705,7 +694,7 @@ void DCC::updateLocoReminder(int loco, byte speedCode) {
if (loco==0) {
// broadcast stop/estop but dont change direction
for (int reg = 0; reg < MAX_LOCOS; reg++) {
for (int reg = 0; reg < highestUsedReg; reg++) {
if (speedTable[reg].loco==0) continue;
byte newspeed=(speedTable[reg].speedCode & 0x80) | (speedCode & 0x7f);
if (speedTable[reg].speedCode != newspeed) {
@@ -725,13 +714,14 @@ void DCC::updateLocoReminder(int loco, byte speedCode) {
}
DCC::LOCO DCC::speedTable[MAX_LOCOS];
int DCC::nextLoco = 0;
int DCC::lastLocoReminder = 0;
int DCC::highestUsedReg = 0;
void DCC::displayCabList(Print * stream) {
int used=0;
for (int reg = 0; reg < MAX_LOCOS; reg++) {
for (int reg = 0; reg <= highestUsedReg; reg++) {
if (speedTable[reg].loco>0) {
used ++;
StringFormatter::send(stream,F("cab=%d, speed=%d, dir=%c \n"),