1/*- 2 * Copyright (c) 2006 M. Warner Losh. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 * 24 * This software is derived from software provided by kwikbyte without 25 * copyright as follows: 26 * 27 * No warranty, expressed or implied, is included with this software. It is 28 * provided "AS IS" and no warranty of any kind including statutory or aspects 29 * relating to merchantability or fitness for any purpose is provided. All 30 * intellectual property rights of others is maintained with the respective 31 * owners. This software is not copyrighted and is intended for reference 32 * only. 33 * 34 * $FreeBSD: releng/11.0/sys/boot/arm/at91/libat91/getc.c 168013 2007-03-28 22:40:37Z imp $ 35 */ 36 37#include "at91rm9200.h" 38#include "at91rm9200_lowlevel.h" 39#include "lib.h" 40 41/* 42 * int getc(int seconds) 43 * 44 * Reads a character from the DBGU port, if one is available within about 45 * seconds seconds. It assumes that DBGU has already been initialized. 46 */ 47int 48getc(int seconds) 49{ 50 AT91PS_USART pUSART = (AT91PS_USART)AT91C_BASE_DBGU; 51 unsigned thisSecond; 52 53 // Clamp to 20s 54 if (seconds > 20) 55 seconds = 20; 56 thisSecond = GetSeconds(); 57 seconds = thisSecond + seconds; 58 do { 59 if ((pUSART->US_CSR & AT91C_US_RXRDY)) 60 return (pUSART->US_RHR & 0xFF); 61 thisSecond = GetSeconds(); 62 } while (thisSecond != seconds); 63 return (-1); 64} 65