/* USART Check if Transmit Data Buffer is Empty. 
Check if transmit data buffer is empty and is ready to accept the next data word. */
bool usart_is_send_ready(uint32_t usart)
/* USART Check if Transmit Data Buffer is Empty. 
Check if transmit data buffer is empty and is ready to accept the next data word. */
bool usart_is_send_ready(uint32_t usart)
{
	return (USART_ISR(usart) & USART_ISR_TXE);
}