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more reliable search rom (but also with more active waiting)

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This commit is contained in:
Youen Toupin 2015-04-25 00:06:00 +02:00
parent f53e2adae8
commit c0250f685b
1 changed files with 67 additions and 2 deletions
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69
OneWireIO.ino
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@ -216,7 +216,9 @@ void onewireInterruptImpl(void)
byte currentByte = owROM[searchROMCurrentByte];
searchRomNextBit = bitRead(currentByte, searchROMCurrentBit);
searchRomNextBitToSend = searchROMSendingInverse ? !searchRomNextBit : searchRomNextBit;
attachInterrupt(InterruptNumber, onewireInterruptSearchROM, FALLING);
//attachInterrupt(InterruptNumber, onewireInterruptSearchROM, FALLING);
setTimerEvent(10, owSearchSendBit);
detachInterrupt(InterruptNumber);
return;
}
}
@ -225,6 +227,57 @@ void onewireInterruptImpl(void)
}
bool ignoreNextFallingEdge = false;
void owSearchSendBit()
{
// wait for a falling edge (active wait is more reliable than interrupts to send the bit fast enough)
while (!owPin.read());
while (owPin.read());
//sendBit(searchRomNextBitToSend);
if (searchRomNextBitToSend)
{
//delayMicroseconds(SendBitDuration);
ignoreNextFallingEdge = false;
}
else
{
owPullLow();
//delayMicroseconds(SendBitDuration);
//owRelease();
ignoreNextFallingEdge = true;
}
unsigned long sendBitStart = micros();
if (searchROMSendingInverse)
{
searchROMSendingInverse = false;
searchROMReadingMasterResponseBit = true;
}
else
{
searchROMSendingInverse = true;
}
byte currentByte = owROM[searchROMCurrentByte];
searchRomNextBit = bitRead(currentByte, searchROMCurrentBit);
searchRomNextBitToSend = searchROMSendingInverse ? !searchRomNextBit : searchRomNextBit;
if (searchROMReadingMasterResponseBit)
{
ignoreNextFallingEdge = true;
attachInterrupt(InterruptNumber, onewireInterruptSearchROM, FALLING);
}
else
{
setTimerEvent(10, owSearchSendBit);
}
delayMicroseconds(SendBitDuration - (micros() - sendBitStart));
owRelease();
}
void onewireInterruptSearchROM()
{
if (ignoreNextFallingEdge)
@ -262,6 +315,14 @@ void onewireInterruptSearchROM()
attachInterrupt(InterruptNumber, onewireInterrupt, FALLING);
return;
}
byte currentByte = owROM[searchROMCurrentByte];
searchRomNextBit = bitRead(currentByte, searchROMCurrentBit);
searchRomNextBitToSend = searchROMSendingInverse ? !searchRomNextBit : searchRomNextBit;
setTimerEvent(10, owSearchSendBit);
detachInterrupt(InterruptNumber);
return;
}
else
{
@ -290,7 +351,10 @@ void onewireInterruptSearchROM()
bool readBit()
{
delayMicroseconds(ReadBitSamplingTime);
return owPin.read();
bool bit = owPin.read();
//owOutTestPin.write(!owOutTestPin.read());
//owOutTestPin.write(!owOutTestPin.read());
return bit;
}
void sendBit(bool bit)
@ -298,6 +362,7 @@ void sendBit(bool bit)
if (bit)
{
delayMicroseconds(SendBitDuration);
ignoreNextFallingEdge = false;
}
else
{