2013-01-08 22:40:58 +08:00
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//*****************************************************************************
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//
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// qei.h - Prototypes for the Quadrature Encoder Driver.
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//
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// Copyright (c) 2005-2011 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Texas Instruments (TI) is supplying this software for use solely and
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// exclusively on TI's microcontroller products. The software is owned by
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// TI and/or its suppliers, and is protected under applicable copyright
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// laws. You may not combine this software with "viral" open-source
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// software in order to form a larger program.
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//
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// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
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// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
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// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
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// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
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// DAMAGES, FOR ANY REASON WHATSOEVER.
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//
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// This is part of revision 8264 of the Stellaris Peripheral Driver Library.
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//
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//*****************************************************************************
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#ifndef __QEI_H__
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#define __QEI_H__
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//*****************************************************************************
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//
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// If building with a C++ compiler, make all of the definitions in this header
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// have a C binding.
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//
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//*****************************************************************************
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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//*****************************************************************************
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//
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// Values that can be passed to QEIConfigure as the ulConfig paramater.
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//
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//*****************************************************************************
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#define QEI_CONFIG_CAPTURE_A 0x00000000 // Count on ChA edges only
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#define QEI_CONFIG_CAPTURE_A_B 0x00000008 // Count on ChA and ChB edges
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#define QEI_CONFIG_NO_RESET 0x00000000 // Do not reset on index pulse
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#define QEI_CONFIG_RESET_IDX 0x00000010 // Reset position on index pulse
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#define QEI_CONFIG_QUADRATURE 0x00000000 // ChA and ChB are quadrature
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#define QEI_CONFIG_CLOCK_DIR 0x00000004 // ChA and ChB are clock and dir
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#define QEI_CONFIG_NO_SWAP 0x00000000 // Do not swap ChA and ChB
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#define QEI_CONFIG_SWAP 0x00000002 // Swap ChA and ChB
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//*****************************************************************************
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//
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// Values that can be passed to QEIVelocityConfigure as the ulPreDiv parameter.
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//
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//*****************************************************************************
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#define QEI_VELDIV_1 0x00000000 // Predivide by 1
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#define QEI_VELDIV_2 0x00000040 // Predivide by 2
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#define QEI_VELDIV_4 0x00000080 // Predivide by 4
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#define QEI_VELDIV_8 0x000000C0 // Predivide by 8
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#define QEI_VELDIV_16 0x00000100 // Predivide by 16
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#define QEI_VELDIV_32 0x00000140 // Predivide by 32
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#define QEI_VELDIV_64 0x00000180 // Predivide by 64
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#define QEI_VELDIV_128 0x000001C0 // Predivide by 128
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//*****************************************************************************
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//
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// Values that can be passed to QEIEnableInts, QEIDisableInts, and QEIClearInts
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// as the ulIntFlags parameter, and returned by QEIGetIntStatus.
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//
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//*****************************************************************************
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#define QEI_INTERROR 0x00000008 // Phase error detected
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#define QEI_INTDIR 0x00000004 // Direction change
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#define QEI_INTTIMER 0x00000002 // Velocity timer expired
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#define QEI_INTINDEX 0x00000001 // Index pulse detected
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//*****************************************************************************
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//
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// Prototypes for the APIs.
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//
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//*****************************************************************************
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extern void QEIEnable(unsigned long ulBase);
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extern void QEIDisable(unsigned long ulBase);
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extern void QEIConfigure(unsigned long ulBase, unsigned long ulConfig,
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unsigned long ulMaxPosition);
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extern unsigned long QEIPositionGet(unsigned long ulBase);
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extern void QEIPositionSet(unsigned long ulBase, unsigned long ulPosition);
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extern long QEIDirectionGet(unsigned long ulBase);
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extern tBoolean QEIErrorGet(unsigned long ulBase);
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extern void QEIVelocityEnable(unsigned long ulBase);
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extern void QEIVelocityDisable(unsigned long ulBase);
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extern void QEIVelocityConfigure(unsigned long ulBase, unsigned long ulPreDiv,
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unsigned long ulPeriod);
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extern unsigned long QEIVelocityGet(unsigned long ulBase);
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extern void QEIIntRegister(unsigned long ulBase, void (*pfnHandler)(void));
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extern void QEIIntUnregister(unsigned long ulBase);
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extern void QEIIntEnable(unsigned long ulBase, unsigned long ulIntFlags);
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extern void QEIIntDisable(unsigned long ulBase, unsigned long ulIntFlags);
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extern unsigned long QEIIntStatus(unsigned long ulBase, tBoolean bMasked);
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extern void QEIIntClear(unsigned long ulBase, unsigned long ulIntFlags);
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//*****************************************************************************
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//
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// Mark the end of the C bindings section for C++ compilers.
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//
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//*****************************************************************************
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#ifdef __cplusplus
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}
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#endif
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#endif // __QEI_H__
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