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Wire: Fix write() returning incorrect byte count on buffer overflow (See issue #597) #612

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Wire: Fix write() returning incorrect byte count on buffer overflow (See issue #597) #612

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a87cc4c
Wire: Fix write() returning incorrect byte count on buffer overflow (…
Tranomial Nov 22, 2025
4a0324a
fixed typo
Tranomial Nov 22, 2025
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7 changes: 5 additions & 2 deletions libraries/Wire/src/Wire.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -264,17 +264,20 @@ size_t TwoWire::write(uint8_t data)
// or after beginTransmission(address)
size_t TwoWire::write(const uint8_t *data, size_t quantity)
{
// number of bytes successfully added to the buffer
uint8_t bytesSent = 0;
if(transmitting){
// in master transmitter mode
for(size_t i = 0; i < quantity; ++i){
write(data[i]);
if (write(data[i]) == 1) // if a byte was successfully added to the buffer
bytesSent++;
}
}else{
// in slave send mode
// reply to master
twi_transmit(data, quantity);
}
return quantity;
return bytesSent;
}

// must be called in:
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