Function uart_tx_flush

src/drivers/uart/sifive.c:77–86

}

void uart_tx_flush(unsigned int idx)
{
	struct sifive_uart_registers *regs = uart_platform_baseptr(idx);
	uint32_t ip;

	/* Use the TX watermark bit to find out if the TX FIFO is empty */
	do {
		ip = read32(&regs->ip);
	} while (!(ip & IP_TXWM));
}

unsigned char uart_rx_byte(unsigned int idx)
{