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scottnortm |
/*------------------------------------------------------------------------------
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* File: quad_decoder.h
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* Desc: Header file for the baseline quadrature decoder driver API.
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* Date: Initiated October, 2009
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* Auth: Scott Nortman, Bridge Electronic Design LLC
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* Current Version: v1.0.0
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*
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* Revision History
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*
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*
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* When Who What
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* ---------------------------------------------------------------------------
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* 10/2009 S. Nortman Initial development started.
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* 7/2010 S. Nortman Added comments, clean code, release v1.0.0
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*
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*----------------------------------------------------------------------------*/
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#ifndef _QUAD_DECODER_H_
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#define _QUAD_DECODER_H_
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#include <stdint.h>
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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/* Registers and bit definitions */
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/* Quadrature Control Register, offset from base address */
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#define QUAD_DCDR_QCR_REG( handle ) ( *(volatile uint32_t *)(handle+0x00) )
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#define QCR_ECNT ( 0 ) /* Enable Count bit */
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#define QCR_CTDR ( 1 ) /* Count direction bit */
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#define QCR_INEN ( 2 ) /* Index enable enable bit */
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#define QCR_INZC ( 3 ) /* Index zero count bit */
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#define QCR_INIE ( 4 ) /* Index interrupt enable */
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#define QCR_PLCT ( 5 ) /* Pre-load count bit */
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#define QCR_UNIE ( 6 ) /* Underflow interrupt enable bit */
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#define QCR_OVIE ( 7 ) /* Overflow interrupt enable bit */
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#define QCR_QLAT ( 8 ) /* Quadrature count latch bit */
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#define QCR_ICHA ( 9 ) /* Index CHA set */
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#define QCR_ICHB ( 10 ) /* Index CHB set */
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#define QCR_IDXL ( 11 ) /* Index level set */
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#define QCR_QEIE ( 12 ) /* Quadrature error interrupt enable bit */
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#define QCR_INRC ( 13 ) /* index event causes a read of quad count into QRW */
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#define QCR_CCME ( 14 ) /* Quadrature Compare Match Enable */
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#define QCR_CMIE ( 15 ) /* Quad. Compare Match Interrupt Enable */
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/* Quadrature status register */
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#define QUAD_DCDR_QSR_REG( handle ) ( *(volatile uint32_t *)(handle+0x04))
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#define QSR_QERR ( 0 ) /* Quadrature error status bit */
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#define QSR_CTOV ( 1 ) /* Quadrature counter overflow status bit */
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#define QSR_CTUN ( 2 ) /* Quadrature counter underflow status bit */
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#define QSR_INEV ( 3 ) /* Index event status bit */
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#define QSR_CCME ( 4 ) /* Count Compare Match Event */
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/* Quadrature count read / write register */
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#define QUAD_DCDR_QRW_REG( handle ) ( *(volatile uint32_t *)(handle+0x08))
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/* Function: quad_dcdr_test
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* Desc: Performs a test of the quadrature decoder module. See the
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* comments in the source file for more information.
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* Args: uint32_t base_add, the base address offset
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* Ret: None
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* Note: Must be called after a successful call to quad_dcdr_ioinit.
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* This function calls quad_dcdr_sim.
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*/
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void quad_dcdr_test( uint32_t base_add );
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/* Function:
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* Desc:
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* Args:
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* Ret:
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* Note:
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*/
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int8_t quad_dcdr_ioinit( void );
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/* Function:
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* Desc:
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* Args:
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* Ret:
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* Note:
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*/
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uint8_t quad_dcdr_sim( int32_t steps, int8_t error );
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#endif /* _QUAD_DECODER_H_ */
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