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Add SPI.transfer16(...) API's to SAM #4081

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Merged
merged 1 commit into from
Nov 4, 2015
Merged

Add SPI.transfer16(...) API's to SAM #4081

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17 changes: 17 additions & 0 deletions hardware/arduino/sam/libraries/SPI/SPI.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -196,6 +196,23 @@ byte SPIClass::transfer(byte _pin, uint8_t _data, SPITransferMode _mode) {
return d & 0xFF;
}

uint16_t SPIClass::transfer16(byte _pin, uint16_t _data, SPITransferMode _mode) {
union { uint16_t val; struct { uint8_t lsb; uint8_t msb; }; } t;
uint32_t ch = BOARD_PIN_TO_SPI_CHANNEL(_pin);

t.val = _data;

if (bitOrder[ch] == LSBFIRST) {
t.lsb = transfer(_pin, t.lsb, _mode);
t.msb = transfer(_pin, t.msb, _mode);
} else {
t.msb = transfer(_pin, t.msb, _mode);
t.lsb = transfer(_pin, t.lsb, _mode);
}

return t.val;
}

void SPIClass::transfer(byte _pin, void *_buf, size_t _count, SPITransferMode _mode) {
if (_count == 0)
return;
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2 changes: 2 additions & 0 deletions hardware/arduino/sam/libraries/SPI/SPI.h
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Expand Up @@ -82,9 +82,11 @@ class SPIClass {

// Transfer functions
byte transfer(byte _pin, uint8_t _data, SPITransferMode _mode = SPI_LAST);
uint16_t transfer16(byte _pin, uint16_t _data, SPITransferMode _mode = SPI_LAST);
void transfer(byte _pin, void *_buf, size_t _count, SPITransferMode _mode = SPI_LAST);
// Transfer functions on default pin BOARD_SPI_DEFAULT_SS
byte transfer(uint8_t _data, SPITransferMode _mode = SPI_LAST) { return transfer(BOARD_SPI_DEFAULT_SS, _data, _mode); }
uint16_t transfer16(uint16_t _data, SPITransferMode _mode = SPI_LAST) { return transfer16(BOARD_SPI_DEFAULT_SS, _data, _mode); }
void transfer(void *_buf, size_t _count, SPITransferMode _mode = SPI_LAST) { transfer(BOARD_SPI_DEFAULT_SS, _buf, _count, _mode); }

// Transaction Functions
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