1 //*****************************************************************************
3 // qei.h - Prototypes for the Quadrature Encoder Driver.
5 // Copyright (c) 2005,2006 Luminary Micro, Inc. All rights reserved.
7 // Software License Agreement
9 // Luminary Micro, Inc. (LMI) is supplying this software for use solely and
10 // exclusively on LMI's Stellaris Family of microcontroller products.
12 // The software is owned by LMI and/or its suppliers, and is protected under
13 // applicable copyright laws. All rights are reserved. Any use in violation
14 // of the foregoing restrictions may subject the user to criminal sanctions
15 // under applicable laws, as well as to civil liability for the breach of the
16 // terms and conditions of this license.
18 // THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
19 // OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
20 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
21 // LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
22 // CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
24 // This is part of revision 816 of the Stellaris Driver Library.
26 //*****************************************************************************
36 //*****************************************************************************
38 // Values that can be passed to QEIConfigure as the ulConfig paramater.
40 //*****************************************************************************
41 #define QEI_CONFIG_CAPTURE_A 0x00000000 // Count on ChA edges only
42 #define QEI_CONFIG_CAPTURE_A_B 0x00000008 // Count on ChA and ChB edges
43 #define QEI_CONFIG_NO_RESET 0x00000000 // Do not reset on index pulse
44 #define QEI_CONFIG_RESET_IDX 0x00000010 // Reset position on index pulse
45 #define QEI_CONFIG_QUADRATURE 0x00000000 // ChA and ChB are quadrature
46 #define QEI_CONFIG_CLOCK_DIR 0x00000004 // ChA and ChB are clock and dir
47 #define QEI_CONFIG_NO_SWAP 0x00000000 // Do not swap ChA and ChB
48 #define QEI_CONFIG_SWAP 0x00000002 // Swap ChA and ChB
50 //*****************************************************************************
52 // Values that can be passed to QEIVelocityConfigure as the ulPreDiv parameter.
54 //*****************************************************************************
55 #define QEI_VELDIV_1 0x00000000 // Predivide by 1
56 #define QEI_VELDIV_2 0x00000040 // Predivide by 2
57 #define QEI_VELDIV_4 0x00000080 // Predivide by 4
58 #define QEI_VELDIV_8 0x000000C0 // Predivide by 8
59 #define QEI_VELDIV_16 0x00000100 // Predivide by 16
60 #define QEI_VELDIV_32 0x00000140 // Predivide by 32
61 #define QEI_VELDIV_64 0x00000180 // Predivide by 64
62 #define QEI_VELDIV_128 0x000001C0 // Predivide by 128
64 //*****************************************************************************
66 // Values that can be passed to QEIEnableInts, QEIDisableInts, and QEIClearInts
67 // as the ulIntFlags parameter, and returned by QEIGetIntStatus.
69 //*****************************************************************************
70 #define QEI_INTERROR 0x00000008 // Phase error detected
71 #define QEI_INTDIR 0x00000004 // Direction change
72 #define QEI_INTTIMER 0x00000002 // Velocity timer expired
73 #define QEI_INTINDEX 0x00000001 // Index pulse detected
75 //*****************************************************************************
77 // Prototypes for the APIs.
79 //*****************************************************************************
80 extern void QEIEnable(unsigned long ulBase);
81 extern void QEIDisable(unsigned long ulBase);
82 extern void QEIConfigure(unsigned long ulBase, unsigned long ulConfig,
83 unsigned long ulMaxPosition);
84 extern unsigned long QEIPositionGet(unsigned long ulBase);
85 extern void QEIPositionSet(unsigned long ulBase, unsigned long ulPosition);
86 extern long QEIDirectionGet(unsigned long ulBase);
87 extern tBoolean QEIErrorGet(unsigned long ulBase);
88 extern void QEIVelocityEnable(unsigned long ulBase);
89 extern void QEIVelocityDisable(unsigned long ulBase);
90 extern void QEIVelocityConfigure(unsigned long ulBase, unsigned long ulPreDiv,
91 unsigned long ulPeriod);
92 extern unsigned long QEIVelocityGet(unsigned long ulBase);
93 extern void QEIIntRegister(unsigned long ulBase, void (*pfnHandler)(void));
94 extern void QEIIntUnregister(unsigned long ulBase);
95 extern void QEIIntEnable(unsigned long ulBase, unsigned long ulIntFlags);
96 extern void QEIIntDisable(unsigned long ulBase, unsigned long ulIntFlags);
97 extern unsigned long QEIIntStatus(unsigned long ulBase, tBoolean bMasked);
98 extern void QEIIntClear(unsigned long ulBase, unsigned long ulIntFlags);