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Fix buffer being overwritten by multiple twi_transmit calls 

Fixes that more complex methods (like Stream::print(float)) do not work properly.

Without this fix, Wire.print(1.01f); results in '1' because Print::printFloat(double, uint8_t) performs multiple print() and therefore twi_transmit calls. Also Wire.println("Heyho"); results only in a newline character.
This commit is contained in:
kellerkindt 2016-06-05 03:01:57 +02:00
parent 61323525b7
commit ab4e114624
1 changed files with 3 additions and 3 deletions
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6
hardware/arduino/avr/libraries/Wire/src/utility/twi.c
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@ -304,7 +304,7 @@ uint8_t twi_transmit(const uint8_t* data, uint8_t length)
uint8_t i;
// ensure data will fit into buffer
if(TWI_BUFFER_LENGTH < length){
if(TWI_BUFFER_LENGTH < (twi_txBufferLength+length)){
return 1;
}
@ -314,10 +314,10 @@ uint8_t twi_transmit(const uint8_t* data, uint8_t length)
}
// set length and copy data into tx buffer
twi_txBufferLength = length;
for(i = 0; i < length; ++i){
twi_txBuffer[i] = data[i];
twi_txBuffer[twi_txBufferLength+i] = data[i];
}
twi_txBufferLength += length;
return 0;
}