/* Output a character in polled mode. 
Writes data to tx register. Waits for space if transmitter is full. */
static void uart_usbserial_poll_out(const struct device *dev, unsigned char c)
/* Output a character in polled mode. 
Writes data to tx register. Waits for space if transmitter is full. */
static void uart_usbserial_poll_out(const struct device *dev, unsigned char c)
{
	while (usbserial_tx_fifo_full())
		;
	usbserial_regs->wdata = c;
}