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143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/*
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Copyright (c) 2013 Arduino. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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 "sn65hvd234.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->dwPin_Rs=0u ;
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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, uint32_t dwPin_Rs )
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{
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pComponent->dwPin_Rs=dwPin_Rs ;
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pinMode( dwPin_Rs, OUTPUT ) ;
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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, uint32_t dwPin_EN )
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{
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pComponent->dwPin_EN=dwPin_EN ;
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pinMode( dwPin_EN, OUTPUT ) ;
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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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digitalWrite( pComponent->dwPin_EN, HIGH ) ;
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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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digitalWrite( pComponent->dwPin_EN, LOW ) ;
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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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digitalWrite( pComponent->dwPin_Rs, HIGH ) ;
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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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digitalWrite( pComponent->dwPin_Rs, LOW ) ;
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return 0u ;
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}
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