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Merged
f-okuhara merged 1 commit into from
Nov 16, 2018
Merged

Check sizeof(double) #62

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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -167,7 +167,9 @@ Please see example code.
* [Shell](./examples/Shell/Shell.ino)
* [Send illminance (CdS)](./examples/CdS/CdS.ino)

# Notes

* On the Uno and other ATMEGA based boards, Values ​​of type double are sent as float type. (Please see [Arduino Reference]( https://www.arduino.cc/reference/en/language/variables/data-types/double/).)

# License

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12 changes: 12 additions & 0 deletions src/SakuraIO.cpp
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Expand Up @@ -164,6 +164,18 @@ uint8_t SakuraIO::enqueueTx(uint8_t ch, float value, uint64_t offset){
}

uint8_t SakuraIO::enqueueTx(uint8_t ch, double value, uint64_t offset){

// check sizeof(double)
//
// On the Uno and other ATMEGA based boards,
// this occupies 4 bytes. That is, the double
// implementation is exactly the same as the float,
// with no gain in precision.
// https://www.arduino.cc/reference/en/language/variables/data-types/double/
if (sizeof(double) == 4){
return enqueueTx(ch, (float)value, offset);
}

return enqueueTxRaw(ch, 'd', 8, (uint8_t *)&value, offset);
}

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