/********************************************************************************************
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* File: serial.c
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* Version: 1.0.0
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* Copyright: 2011 (c) Guo Wenxue <guowenxue@gmail.com>
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* Description: The UART on board drivers/functions.
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* ChangeLog: 1, Release initial version on "Tue Jul 12 16:43:18 CST 2011"
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*
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*******************************************************************************************/
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#include <common.h>
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#define GPHCON (*(unsigned long volatile *)0x56000070)
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void serial_init(void)
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{
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S3C24X0_UART *const uart = (S3C24X0_UART *) ELFIN_UART_BASE;
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/*Enable UART0,UART1,UART2 */
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GPHCON = 0x0000aaaa;
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/*Set Parity, Stopbit etc. */
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uart->ULCON &= 0XFFFFFF00;
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uart->ULCON |= 0X03;
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/*Disable modem */
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uart->UMCON = 0x0;
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/*Set UART FIFO control register */
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uart->UFCON = 0x00;
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uart->UCON = 0x805; /*Enable FIFO */
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/*
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* UBRDIV = (UART Clock)/(baudrate*16) -1
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* = (50 000 000)/(115200*16) -1
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* = 26
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* = 0x1A
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*/
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uart->UBRDIV = 0x1A;
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}
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void serial_send_byte(char c)
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{
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S3C24X0_UART *const uart = (S3C24X0_UART *) ELFIN_UART_BASE;
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/* wait for room in the tx FIFO */
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while (!(uart->UTRSTAT & 0x2)) ;
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uart->UTXH = c;
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if (c == '\n') /* If \n, also do \r */
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serial_send_byte('\r');
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}
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int serial_is_recv_enable(void)
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{
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S3C24X0_UART *const uart = (S3C24X0_UART *) ELFIN_UART_BASE;
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return uart->UTRSTAT & 0x1;
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}
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int serial_recv_byte(void)
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{
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S3C24X0_UART *const uart = (S3C24X0_UART *) ELFIN_UART_BASE;
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/* wait for character to arrive */
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while (!(uart->UTRSTAT & 0x1)) ;
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return uart->URXH & 0xff;
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}
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void serial_puts(const char *s)
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{
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while (*s)
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{
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serial_send_byte(*s++);
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}
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}
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