00001 /***************************************************************************************** 00002 Copyright (c) 2002-2004 The UbixOS Project 00003 All rights reserved. 00004 00005 Redistribution and use in source and binary forms, with or without modification, are 00006 permitted provided that the following conditions are met: 00007 00008 Redistributions of source code must retain the above copyright notice, this list of 00009 conditions, the following disclaimer and the list of authors. Redistributions in binary 00010 form must reproduce the above copyright notice, this list of conditions, the following 00011 disclaimer and the list of authors in the documentation and/or other materials provided 00012 with the distribution. Neither the name of the UbixOS Project nor the names of its 00013 contributors may be used to endorse or promote products derived from this software 00014 without specific prior written permission. 00015 00016 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 00017 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00018 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 00019 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00020 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00021 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00022 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 00023 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00024 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00025 00026 $Id: pit_8c-source.html 88 2016-01-12 00:11:29Z reddawg $ 00027 00028 *****************************************************************************************/ 00029 00030 #include <isa/pit.h> 00031 #include <sys/io.h> 00032 #include <lib/kprintf.h> 00033 00034 /***************************************************************************************** 00035 00036 Function: int pitInit() 00037 00038 Description: This Function Will Initialize The Programmable Timer 00039 00040 Notes: 00041 00042 0040 r/w PIT counter 0, counter divisor (XT, AT, PS/2) 00043 0041 r/w PIT counter 1, RAM refresh counter (XT, AT) 00044 0042 r/w PIT counter 2, cassette & speaker (XT, AT, PS/2) 00045 0043 r/w PIT mode port, control word register for counters 0-2 00046 00047 bit 7-6 = 00 counter 0 select 00048 = 01 counter 1 select (not PS/2) 00049 = 10 counter 2 select 00050 bit 5-4 = 00 counter latch command 00051 = 01 read/write counter bits 0-7 only 00052 = 10 read/write counter bits 8-15 only 00053 = 11 read/write counter bits 0-7 first, then 8-15 00054 bit 3-1 = 000 mode 0 select 00055 = 001 mode 1 select - programmable one shot 00056 = x10 mode 2 select - rate generator 00057 = x11 mode 3 select - square wave generator 00058 = 100 mode 4 select - software triggered strobe 00059 = 101 mode 5 select - hardware triggered strobe 00060 bit 0 = 0 binary counter 16 bits 00061 = 1 BCD counter 00062 00063 *****************************************************************************************/ 00064 int pit_init() { 00065 outportByteP(0x43,0x36); 00066 outportByteP(0x40,((1193180/PIT_TIMER) & 0xFF)); 00067 outportByte(0x40,(((1193180/PIT_TIMER) >> 8) & 0xFF)); 00068 00069 /* Print out information on the PIT */ 00070 kprintf("pit0 - Port [0x%X], Timer Hz: [%iHz]\n",0x43,PIT_TIMER); 00071 00072 /* Return so we know everything went well */ 00073 return(0x0); 00074 } 00075 00076 /*** 00077 $Log: pit_8c-source.html,v $ 00077 Revision 1.7 2006/12/15 17:47:06 reddawg 00077 Updates 00077 00078 Revision 1.1.1.1 2006/06/01 12:46:12 reddawg 00079 ubix2 00080 00081 Revision 1.2 2005/10/12 00:13:37 reddawg 00082 Removed 00083 00084 Revision 1.1.1.1 2005/09/26 17:24:03 reddawg 00085 no message 00086 00087 Revision 1.7 2004/07/16 04:06:32 reddawg 00088 Tune ups this stuff should of been taken care of months ago 00089 00090 Revision 1.6 2004/07/16 01:08:58 reddawg 00091 Whew we work once again 00092 00093 Revision 1.5 2004/07/09 13:29:15 reddawg 00094 pit: pitInit to pit_init 00095 Adjusted initialization routines 00096 00097 Revision 1.4 2004/05/21 12:48:22 reddawg 00098 Cleaned up 00099 00100 Revision 1.3 2004/05/20 22:51:09 reddawg 00101 Cleaned Up Warnings 00102 00103 Revision 1.2 2004/05/10 02:23:24 reddawg 00104 Minor Changes To Source Code To Prepare It For Open Source Release 00105 00106 END 00107 ***/ 00108
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