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Correct an issue where write could send data out of order.

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This commit is contained in:
Collin Kidder
2014-12-31 08:42:26 -05:00
parent eff20deb27
commit 76280e8778
1 changed files with 1 additions and 1 deletions
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hardware/arduino/sam/cores/arduino/UARTClass.cpp
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@ -141,7 +141,7 @@ void UARTClass::flush( void )
size_t UARTClass::write( const uint8_t uc_data ) size_t UARTClass::write( const uint8_t uc_data )
{ {
if ((_pUart->UART_SR & UART_SR_TXRDY) != UART_SR_TXRDY) //is the hardware currently busy? if (((_pUart->UART_SR & UART_SR_TXRDY) != UART_SR_TXRDY) | (_tx_buffer->_iTail != _tx_buffer->_iHead)) //is the hardware currently busy?
{ {
//if busy we buffer //if busy we buffer
unsigned int l = (_tx_buffer->_iHead + 1) % SERIAL_BUFFER_SIZE; unsigned int l = (_tx_buffer->_iHead + 1) % SERIAL_BUFFER_SIZE;