medium_io.c

Hermit-at-1.1.3,一款bootloader

#include <target/ioregs.h>

int arch_getchar(unsigned long timeout)
{
        while (!(IO_UART_STATUS & UART_STATREG_RX_FIFO_VALID_DATA));
        return IO_UART_RECEIVE_FIFO & 0xff;
}

int arch_putchar(int c, unsigned long timeout)
{
        while (IO_UART_STATUS & UART_STATREG_TX_FIFO_FULL);
        IO_UART_TRANSMIT_FIFO = (unsigned char) (c & 0xff);
        return 0;
}