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Merged
merged 2 commits into from
Nov 4, 2015
Merged

Add SPI.transfer16(...) API's #59

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2ceac44
Add getDataOrderSPI API to Sercom
sandeepmistry Nov 4, 2015
82ddeb0
Add SPI. transfer16(...) API
sandeepmistry Nov 4, 2015
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5 changes: 5 additions & 0 deletions cores/arduino/SERCOM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -262,6 +262,11 @@ void SERCOM::setDataOrderSPI(SercomDataOrder dataOrder)
enableSPI();
}

SercomDataOrder SERCOM::getDataOrderSPI()
{
return (sercom->SPI.CTRLA.bit.DORD ? LSB_FIRST : MSB_FIRST);
}

void SERCOM::setBaudrateSPI(uint8_t divider)
{
//Can't divide by 0
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1 change: 1 addition & 0 deletions cores/arduino/SERCOM.h
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Expand Up @@ -173,6 +173,7 @@ class SERCOM
void enableSPI( void ) ;
void disableSPI( void ) ;
void setDataOrderSPI(SercomDataOrder dataOrder) ;
SercomDataOrder getDataOrderSPI( void ) ;
void setBaudrateSPI(uint8_t divider) ;
void setClockModeSPI(SercomSpiClockMode clockMode) ;
void writeDataSPI(uint8_t data) ;
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16 changes: 16 additions & 0 deletions libraries/SPI/SPI.cpp
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Expand Up @@ -194,6 +194,22 @@ byte SPIClass::transfer(uint8_t data)
return _p_sercom->readDataSPI() & 0xFF;
}

uint16_t SPIClass::transfer16(uint16_t data) {
union { uint16_t val; struct { uint8_t lsb; uint8_t msb; }; } t;

t.val = data;

if (_p_sercom->getDataOrderSPI() == LSB_FIRST) {
t.lsb = transfer(t.lsb);
t.msb = transfer(t.msb);
} else {
t.msb = transfer(t.msb);
t.lsb = transfer(t.lsb);
}

return t.val;
}

void SPIClass::attachInterrupt() {
// Should be enableInterrupt()
}
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1 change: 1 addition & 0 deletions libraries/SPI/SPI.h
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Expand Up @@ -95,6 +95,7 @@ class SPIClass {


byte transfer(uint8_t data);
uint16_t transfer16(uint16_t data);
inline void transfer(void *buf, size_t count);

// Transaction Functions
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