35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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// timer.h: 82C54 command register bits
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// and mode definition used by the PCI 416-board
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// Copyright (c) Datel, Inc. 1997
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// Version: 1.0
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// Author: GS
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// created: 2/4/97
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// modified: 4/15/96
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///////////////////////////////////////////////////////////////////////////////
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#ifndef TIMER_H
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#define TIMER_H
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#define SEL0 (unsigned int) 0x00 // select counter # 0
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#define SEL1 (unsigned int) 0x40 // select counter # 1
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#define SEL2 (unsigned int) 0x80 // select counter # 2
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#define LSBMSB (unsigned int) 0x30 // load lsb followed by msb
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#define MODE0 (unsigned int) 0x00 // modes
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#define MODE1 (unsigned int) 0x02
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// 8254 Constants
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#define MODE2 (unsigned int) 0x04 // software trigger
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#define MODE3 (unsigned int) 0x06
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#define MODE4 (unsigned int) 0x08 // hardware trigger
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#define MODE5 (unsigned int) 0x0A
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#define BINARY (unsigned int) 0x00 // binary count
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#define BCD (unsigned int) 0x01 // bcd count
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#define READBACK (unsigned int) 0xC0 // read back counter command
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#define CLOCK1 8000000L // clock frequency for Sample rate counter (1)
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#define CLOCK2 500000L // clock frequency for internal trigger rate(2)
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enum{TM_SINGLE_TRIGGER, TM_CONT_TRIGGER, TM_RESET_TRIGGER, TM_ADCLOCK};
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#endif
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