/* Disable the USART for the specified USART in SPI mode. 
Ensure that nothing is transferred while setting up buffers. */
void usart_spi_disable(Usart *p_usart)
/* Disable the USART for the specified USART in SPI mode. 
Ensure that nothing is transferred while setting up buffers. */
void usart_spi_disable(Usart *p_usart)
{
	usart_disable_tx(p_usart);
	usart_disable_rx(p_usart);
}