diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp
index 9b345d3e1..155ab4fc8 100644
--- a/libraries/Wire/Wire.cpp
+++ b/libraries/Wire/Wire.cpp
@@ -124,7 +124,6 @@ size_t arduino::MbedI2C::write(const uint8_t* data, int len) {
int arduino::MbedI2C::read() {
int rv = -1;
core_util_critical_section_enter();
-
if (rxBuffer.available()) {
rv = rxBuffer.read_char();
@@ -160,9 +159,12 @@ void arduino::MbedI2C::receiveThd() {
}
if (usedTxBuffer != 0) {
core_util_critical_section_enter();
- slave->write((const char *) txBuffer, usedTxBuffer);
- core_util_critical_section_exit();
+ uint8_t tempTxBuffer[256];
+ uint8_t usedTempTxBuffer = usedTxBuffer;
+ memcpy(tempTxBuffer, txBuffer, usedTempTxBuffer);
usedTxBuffer = 0;
+ core_util_critical_section_exit();
+ slave->write((const char *) tempTxBuffer, usedTempTxBuffer);
}
//slave->stop();
break;
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