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Moving SPI pin initialization from constructor to begin() function. That way, the SPI library won't alter any pin states unless / until you call begin().

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This commit is contained in:
David A. Mellis
2010-08-07 21:24:49 +00:00
parent 08feacbb40
commit b89d8a9c11
5 changed files with 20 additions and 23 deletions
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12
libraries/SPI/SPI.cpp
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@ -13,8 +13,7 @@
SPIClass SPI;
SPIClass::SPIClass()
{
void SPIClass::begin() {
// Set direction register for SCK and MOSI pin.
// MISO pin automatically overrides to INPUT.
// When the SS pin is set as OUTPUT, it can be used as
@ -29,12 +28,15 @@ SPIClass::SPIClass()
digitalWrite(MOSI, LOW);
digitalWrite(SS, HIGH);
SPCR = _BV(SPE) | _BV(MSTR);
// Warning: if the SS pin ever becomes a LOW INPUT then SPI
// automatically switches to Slave, so the data direction of
// the SS pin MUST be kept as OUTPUT.
SPCR = _BV(SPE) | _BV(MSTR);
SPCR |= _BV(MSTR);
SPCR |= _BV(SPE);
}
void SPIClass::end() {
SPCR &= ~_BV(SPE);
}
void SPIClass::setBitOrder(uint8_t bitOrder)