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Code Issues Releases Activity

Optimize SoftwareSerial::setRxIntMsk()

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This precalculates the mask register and value, making setRxIntMask
considerably less complicated. Right now, this is not a big deal, but
simplifying it allows using it inside the ISR next.
This commit is contained in:
Matthijs Kooijman 2014-04-23 19:13:58 +02:00
parent ddbe3174f0
commit ce6b0f89e3
2 changed files with 9 additions and 2 deletions
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9
hardware/arduino/avr/libraries/SoftwareSerial/SoftwareSerial.cpp
View File

@ -403,6 +403,11 @@ void SoftwareSerial::begin(long speed)
// (others might also need it, so we disable the interrupt by using
// the per-pin PCMSK register).
*digitalPinToPCICR(_receivePin) |= _BV(digitalPinToPCICRbit(_receivePin));
// Precalculate the pcint mask register and value, so setRxIntMask
// can be used inside the ISR without costing too much time.
_pcint_maskreg = digitalPinToPCMSK(_receivePin);
_pcint_maskvalue = _BV(digitalPinToPCMSKbit(_receivePin));
tunedDelay(_tx_delay); // if we were low this establishes the end
}
@ -417,9 +422,9 @@ void SoftwareSerial::begin(long speed)
void SoftwareSerial::setRxIntMsk(bool enable)
{
if (enable)
*digitalPinToPCMSK(_receivePin) |= _BV(digitalPinToPCMSKbit(_receivePin));
*_pcint_maskreg |= _pcint_maskvalue;
else
*digitalPinToPCMSK(_receivePin) &= ~_BV(digitalPinToPCMSKbit(_receivePin));
*_pcint_maskreg &= ~_pcint_maskvalue;
}
void SoftwareSerial::end()

2
hardware/arduino/avr/libraries/SoftwareSerial/SoftwareSerial.h
View File

@ -53,6 +53,8 @@ private:
volatile uint8_t *_receivePortRegister;
uint8_t _transmitBitMask;
volatile uint8_t *_transmitPortRegister;
volatile uint8_t *_pcint_maskreg;
uint8_t _pcint_maskvalue;
uint16_t _rx_delay_centering;
uint16_t _rx_delay_intrabit;