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https://github.com/arduino/Arduino.git
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322 lines
8.9 KiB
C
322 lines
8.9 KiB
C
/*
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%atmel_license%
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*/
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/** \file */
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "chip.h"
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/**
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* \brief Configures Pio pin internal pull-up.
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*
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* \param pPio Pointer to a PIO controller.
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* \param dwMask Bitmask of one or more pin(s) to configure.
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* \param dwPullUpEnable Indicates if the pin(s) internal pull-up shall be configured.
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*/
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extern void PIO_DisableInterrupt( Pio *pPio, const uint32_t dwMask )
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{
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/* Disable interrupts on the pin */
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pPio->PIO_IDR = dwMask ;
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}
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/**
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* \brief Configures Pio pin internal pull-up.
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*
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* \param pPio Pointer to a PIO controller.
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* \param dwMask Bitmask of one or more pin(s) to configure.
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* \param dwPullUpEnable Indicates if the pin(s) internal pull-up shall be configured.
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*/
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extern void PIO_PullUp( Pio *pPio, const uint32_t dwMask, const uint32_t dwPullUpEnable )
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{
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/* Enable the pull-up(s) if necessary */
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if ( dwPullUpEnable )
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{
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pPio->PIO_PUER = dwMask ;
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}
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else
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{
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pPio->PIO_PUDR = dwMask ;
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}
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}
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/**
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* \brief Configures Glitch or Debouncing filter for input.
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*
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* \param pin Pointer to a Pin instance describing one or more pins.
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* \param cuttoff Cutt off frequency for debounce filter.
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*/
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extern void PIO_SetDebounceFilter( Pio* pPio, const uint32_t dwMask, const uint32_t dwCuttOff )
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{
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pPio->PIO_IFSCER = dwMask ; /* set Debouncing, 0 bit field no effect */
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pPio->PIO_SCDR = ((32678/(2*(dwCuttOff))) - 1) & 0x3FFF; /* the lowest 14 bits work */
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}
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/**
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* \brief Sets a high output level on all the PIOs defined in the given Pin instance.
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* This has no immediate effects on PIOs that are not output, but the PIO
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* controller will memorize the value they are changed to outputs.
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*
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* \param pin Pointer to a Pin instance describing one or more pins.
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*/
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extern void PIO_Set( Pio* pPio, const uint32_t dwMask )
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{
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pPio->PIO_SODR = dwMask ;
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}
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/**
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* \brief Returns 1 if one or more PIO of the given Pin instance currently have
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* a high level; otherwise returns 0. This method returns the actual value that
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* is being read on the pin. To return the supposed output value of a pin, use
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* PIO_GetOutputDataStatus() instead.
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*
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* \param pin Pointer to a Pin instance describing one or more pins.
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*
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* \return 1 if the Pin instance contains at least one PIO that currently has
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* a high level; otherwise 0.
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*/
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extern uint32_t PIO_Get( Pio* pPio, const EPioType dwType, const uint32_t dwMask )
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{
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uint32_t dwReg ;
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if ( (dwType == PIO_OUTPUT_0) || (dwType == PIO_OUTPUT_1) )
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{
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dwReg = pPio->PIO_ODSR ;
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}
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else
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{
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dwReg = pPio->PIO_PDSR ;
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}
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if ( (dwReg & dwMask) == 0 )
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{
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return 0 ;
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}
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else
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{
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return 1 ;
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}
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}
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/**
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* \brief Sets a low output level on all the PIOs defined in the given Pin instance.
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* This has no immediate effects on PIOs that are not output, but the PIO
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* controller will memorize the value they are changed to outputs.
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*
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* \param pin Pointer to a Pin instance describing one or more pins.
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*/
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extern void PIO_Clear( Pio* pPio, const uint32_t dwMask )
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{
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pPio->PIO_CODR = dwMask ;
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}
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/**
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* \brief Configures one pin of a PIO controller as being controlled by specific peripheral.
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*
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* \param pPio Pointer to a PIO controller.
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* \param dwType PIO type.
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* \param dwMask Bitmask of one or more pin(s) to configure.
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*/
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extern void PIO_SetPeripheral( Pio* pPio, EPioType dwType, uint32_t dwMask )
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{
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uint32_t dwABCDSR ;
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/* Disable interrupts on the pin(s) */
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pPio->PIO_IDR = dwMask ;
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switch ( dwType )
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{
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case PIO_PERIPH_A :
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dwABCDSR = pPio->PIO_ABCDSR[0] ;
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pPio->PIO_ABCDSR[0] &= (~dwMask & dwABCDSR) ;
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dwABCDSR = pPio->PIO_ABCDSR[1];
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pPio->PIO_ABCDSR[1] &= (~dwMask & dwABCDSR) ;
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break ;
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case PIO_PERIPH_B :
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dwABCDSR = pPio->PIO_ABCDSR[0] ;
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pPio->PIO_ABCDSR[0] = (dwMask | dwABCDSR) ;
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dwABCDSR = pPio->PIO_ABCDSR[1] ;
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pPio->PIO_ABCDSR[1] &= (~dwMask & dwABCDSR) ;
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break ;
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case PIO_PERIPH_C :
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dwABCDSR = pPio->PIO_ABCDSR[0] ;
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pPio->PIO_ABCDSR[0] &= (~dwMask & dwABCDSR) ;
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dwABCDSR = pPio->PIO_ABCDSR[1] ;
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pPio->PIO_ABCDSR[1] = (dwMask | dwABCDSR) ;
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break ;
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case PIO_PERIPH_D :
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dwABCDSR = pPio->PIO_ABCDSR[0] ;
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pPio->PIO_ABCDSR[0] = (dwMask | dwABCDSR) ;
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dwABCDSR = pPio->PIO_ABCDSR[1] ;
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pPio->PIO_ABCDSR[1] = (dwMask | dwABCDSR) ;
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break ;
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// other types are invalid in this function
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case PIO_INPUT :
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case PIO_OUTPUT_0 :
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case PIO_OUTPUT_1 :
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case PIO_NOT_A_PIN :
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return ;
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}
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// Remove the pins from under the control of PIO
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pPio->PIO_PDR = dwMask ;
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}
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/**
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* \brief Configures one or more pin(s) or a PIO controller as inputs. Optionally,
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* the corresponding internal pull-up(s) and glitch filter(s) can be enabled.
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*
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* \param pPio Pointer to a PIO controller.
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* \param dwMask Bitmask indicating which pin(s) to configure as input(s).
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* \param dwAttribute .
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*/
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extern void PIO_SetInput( Pio* pPio, uint32_t dwMask, uint32_t dwAttribute )
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{
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PIO_DisableInterrupt( pPio, dwMask ) ;
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PIO_PullUp( pPio, dwMask, dwAttribute & PIO_PULLUP ) ;
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/* Enable Input Filter if necessary */
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if ( dwAttribute & (PIO_DEGLITCH | PIO_DEBOUNCE) )
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{
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pPio->PIO_IFER = dwMask ;
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}
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else
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{
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pPio->PIO_IFDR = dwMask ;
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}
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/* Enable de-glitch or de-bounce if necessary */
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if ( dwAttribute & PIO_DEGLITCH )
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{
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pPio->PIO_IFSCDR = dwMask ;
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}
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else
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{
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if ( dwAttribute & PIO_DEBOUNCE )
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{
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pPio->PIO_IFSCER = dwMask ;
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}
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}
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/* Configure pin as input */
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pPio->PIO_ODR = dwMask ;
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pPio->PIO_PER = dwMask ;
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}
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/**
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* \brief Configures one or more pin(s) of a PIO controller as outputs, with the
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* given default value. Optionally, the multi-drive feature can be enabled
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* on the pin(s).
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*
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* \param pPio Pointer to a PIO controller.
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* \param dwMask Bitmask indicating which pin(s) to configure.
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* \param defaultValue Default level on the pin(s).
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* \param enableMultiDrive Indicates if the pin(s) shall be configured as open-drain.
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* \param enablePullUp Indicates if the pin shall have its pull-up activated.
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*/
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extern void PIO_SetOutput( Pio* pPio, uint32_t dwMask, uint32_t dwDefaultValue,
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uint32_t dwMultiDriveEnable, uint32_t dwPullUpEnable )
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{
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PIO_DisableInterrupt( pPio, dwMask ) ;
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PIO_PullUp( pPio, dwMask, dwPullUpEnable ) ;
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/* Enable multi-drive if necessary */
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if ( dwMultiDriveEnable )
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{
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pPio->PIO_MDER = dwMask ;
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}
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else
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{
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pPio->PIO_MDDR = dwMask ;
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}
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/* Set default value */
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if ( dwDefaultValue )
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{
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pPio->PIO_SODR = dwMask ;
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}
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else
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{
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pPio->PIO_CODR = dwMask ;
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}
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/* Configure pin(s) as output(s) */
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pPio->PIO_OER = dwMask ;
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pPio->PIO_PER = dwMask ;
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}
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/**
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*
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* \return 1 if the pins have been configured properly; otherwise 0.
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*/
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extern uint32_t PIO_Configure( Pio* pPio, const EPioType dwType, const uint32_t dwMask, const uint32_t dwAttribute )
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{
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/* Configure pins */
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switch ( dwType )
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{
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case PIO_PERIPH_A :
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case PIO_PERIPH_B :
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case PIO_PERIPH_C :
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case PIO_PERIPH_D :
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/* Put the pin under control of peripheral */
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PIO_SetPeripheral( pPio, dwType, dwMask ) ;
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/* Disable interrupts on the pin(s) */
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PIO_DisableInterrupt( pPio, dwMask ) ;
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/* Enable Pullup */
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PIO_PullUp( pPio, dwMask, (dwAttribute & PIO_PULLUP) ) ;
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break;
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case PIO_INPUT :
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PIO_SetInput( pPio, dwMask, dwAttribute ) ;
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break;
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case PIO_OUTPUT_0 :
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case PIO_OUTPUT_1 :
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PIO_SetOutput( pPio, dwMask, (dwType == PIO_OUTPUT_1),
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(dwAttribute & PIO_OPENDRAIN) ? 1 : 0,
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(dwAttribute & PIO_PULLUP) ? 1 : 0);
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break ;
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default :
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return 0 ;
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}
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return 1 ;
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}
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/**
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* \brief Returns 1 if one or more PIO of the given Pin are configured to output a
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* high level (even if they are not output).
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* To get the actual value of the pin, use PIO_Get() instead.
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*
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* \param pPio Pointer to a Pin instance describing one or more pins.
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*
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* \return 1 if the Pin instance contains at least one PIO that is configured
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* to output a high level; otherwise 0.
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*/
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extern uint32_t PIO_GetOutputDataStatus( const Pio* pPio, const uint32_t dwMask )
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{
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/* Test if pin is under control of PIO */
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if ( (pPio->PIO_PSR & dwMask) != 0 )
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{
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/* Test if pin is configured as output */
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if ( (pPio->PIO_OSR & dwMask) != 0 )
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{
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return 1 ;
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}
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}
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return 0 ;
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}
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