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158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2010, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/**
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* \file
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*
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* Implementation of the SN65HVD234 drivers.
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*
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*/
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#include "board.h"
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#include <string.h>
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/**
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* \brief Initialize SN65HVD234 component data
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*
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* \param pComponent pointer on SSN65HVD234_Data
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_Init( SSN65HVD234_Data* pComponent )
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{
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pComponent->pPIO_Rs=NULL ;
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pComponent->dwPin_Rs=0u ;
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pComponent->pPIO_EN=NULL ;
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pComponent->dwPin_EN=0u ;
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return 0u ;
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}
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/**
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* \brief Initialize Rs pin of transceiver
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*
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* \param pComponent pointer on SSN65HVD234_Data
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* \param pPIO_Rs pointer on PIOx base for transceiver Rs pin
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* \param dwPin_Rs PIO pin index for transceiver Rs pin
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_SetRs( SSN65HVD234_Data* pComponent, Pio* pPIO_Rs, uint32_t dwPin_Rs )
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{
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pComponent->pPIO_Rs=pPIO_Rs ;
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pComponent->dwPin_Rs=dwPin_Rs ;
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PIO_SetOutput( pPIO_Rs, dwPin_Rs, PIO_PULLUP|PIO_OUTPUT_LOW ) ;
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return 0u ;
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}
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/**
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* \brief Initialize EN pin of transceiver
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*
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* \param pComponent pointer on SSN65HVD234_Data
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* \param pPIO_EN pointer on PIOx base for transceiver EN pin
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* \param dwPin_EN PIO pin index for transceiver EN pin
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_SetEN( SSN65HVD234_Data* pComponent, Pio* pPIO_EN, uint32_t dwPin_EN )
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{
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pComponent->pPIO_EN=pPIO_EN ;
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pComponent->dwPin_EN=dwPin_EN ;
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PIO_SetOutput( pPIO_EN, dwPin_EN, PIO_PULLUP|PIO_OUTPUT_LOW ) ;
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return 0u ;
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}
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/**
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* \brief Enable transceiver
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*
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* \param pComponent pointer on SSN65HVD234_Data
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_Enable( SSN65HVD234_Data* pComponent )
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{
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// Raise EN of SN65HVD234 to High Level (Vcc)
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pComponent->pPIO_EN->PIO_SODR=pComponent->dwPin_EN ;
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return 0u ;
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}
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/**
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* \brief Disable transceiver
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*
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* \param pComponent pointer on SSN65HVD234_Data
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_Disable( SSN65HVD234_Data* pComponent )
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{
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// Lower EN of SN65HVD234 to Low Level (0.0v)
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pComponent->pPIO_EN->PIO_CODR=pComponent->dwPin_EN ;
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return 0u ;
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}
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/**
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* \brief Turn component into lowpower mode
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*
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* \param pComponent pointer on SSN65HVD234_Data
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_EnableLowPower( SSN65HVD234_Data* pComponent )
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{
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// Raise Rs of SN65HVD234 to more than 0.75v
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pComponent->pPIO_Rs->PIO_SODR=pComponent->dwPin_Rs ;
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// Now, SN65HVD234 is only listening
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return 0u ;
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}
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/**
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* \brief Restore Normal mode by leaving lowpower mode
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*
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* \param pComponent pointer on SSN65HVD234_Data
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*
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* \return 0 if OK
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*/
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extern uint32_t SN65HVD234_DisableLowPower( SSN65HVD234_Data* pComponent )
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{
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// Lower Rs of SN65HVD234 to 0.0v < 0.33v
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pComponent->pPIO_Rs->PIO_CODR=pComponent->dwPin_Rs ;
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return 0u ;
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}
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