mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-04 15:24:12 +01:00
285 lines
9.9 KiB
C
285 lines
9.9 KiB
C
/* ----------------------------------------------------------------------------
|
|
* ATMEL Microcontroller Software Support
|
|
* ----------------------------------------------------------------------------
|
|
* Copyright (c) 2010, Atmel Corporation
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the disclaimer below.
|
|
*
|
|
* Atmel's name may not be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
|
|
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
* ----------------------------------------------------------------------------
|
|
*/
|
|
|
|
/** \addtogroup pio_capture_module Working with PIO Parallel Capture Mode
|
|
* The PIO Parallel Capture Mode driver provides the interface to configure and use the
|
|
* PIO Parallel Capture Mode peripheral.\n
|
|
*
|
|
* The PIO Controller integrates an interface able to read data from a CMOS digital
|
|
* image sensor, a high-speed parallel ADC, a DSP synchronous port in synchronous
|
|
* mode, etc.... For better understanding and to ease reading, the following
|
|
* description uses an example with a CMOS digital image sensor
|
|
*
|
|
* To use the PIO Parallel Capture, the user has to follow these few steps:
|
|
* <ul>
|
|
* <li> Enable PIOA peripheral clock </li>
|
|
* <li> Configure the PDC </li>
|
|
* <li> Configure the PIO Capture interrupt </li>
|
|
* <li> Enable the PDC </li>
|
|
* <li> Enable the PIO Capture </li>
|
|
* <li> Wait for interrupt </li>
|
|
* <li> Disable the interrupt </li>
|
|
* <li> Read the DATA </li>
|
|
* </ul>
|
|
*
|
|
* For more accurate information, please look at the PIO Parallel Capture Mode section of the
|
|
* Datasheet.
|
|
*
|
|
* Related files :\n
|
|
* \ref pio_capture.c\n
|
|
* \ref pio_capture.h\n
|
|
*/
|
|
/*@{*/
|
|
/*@}*/
|
|
/**
|
|
* \file
|
|
*
|
|
* Implementation of PIO Parallel Capture.
|
|
*
|
|
*/
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Headers
|
|
*----------------------------------------------------------------------------*/
|
|
|
|
#include "chip.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Local Functions
|
|
*----------------------------------------------------------------------------*/
|
|
/** Copy the API structure for interrupt handler */
|
|
static SPioCaptureInit* _PioCaptureCopy ;
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Global Functions
|
|
*----------------------------------------------------------------------------*/
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief The PIO_CaptureHandler must be called by the PIO Capture Interrupt
|
|
* Service Routine with the corresponding PIO Capture instance.
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
extern void PIO_CaptureHandler( void )
|
|
{
|
|
volatile uint32_t pio_captureSr;
|
|
|
|
/* Read the status register*/
|
|
pio_captureSr = PIOA->PIO_PCISR ;
|
|
pio_captureSr &= PIOA->PIO_PCIMR ;
|
|
|
|
if (pio_captureSr & PIO_PCISR_DRDY)
|
|
{
|
|
/* Parallel Capture Mode Data Ready */
|
|
if ( _PioCaptureCopy->CbkDataReady != NULL )
|
|
{
|
|
_PioCaptureCopy->CbkDataReady( _PioCaptureCopy );
|
|
}
|
|
else
|
|
{
|
|
// TRACE_DEBUG("IT PIO Capture Data Ready received (no callback)\n\r");
|
|
}
|
|
}
|
|
|
|
if (pio_captureSr & PIO_PCISR_OVRE)
|
|
{
|
|
/* Parallel Capture Mode Overrun Error */
|
|
if ( _PioCaptureCopy->CbkOverrun != NULL )
|
|
{
|
|
_PioCaptureCopy->CbkOverrun( _PioCaptureCopy );
|
|
}
|
|
else
|
|
{
|
|
// TRACE_DEBUG("IT PIO Capture Overrun Error received (no callback)\n\r");
|
|
}
|
|
}
|
|
|
|
if (pio_captureSr & PIO_PCISR_RXBUFF)
|
|
{
|
|
/* Reception Buffer Full */
|
|
if ( _PioCaptureCopy->CbkBuffFull != NULL )
|
|
{
|
|
_PioCaptureCopy->CbkBuffFull( _PioCaptureCopy );
|
|
}
|
|
else
|
|
{
|
|
// TRACE_DEBUG("IT PIO Capture Reception Buffer Full received (no callback)\n\r");
|
|
}
|
|
}
|
|
|
|
if (pio_captureSr & PIO_PCISR_ENDRX)
|
|
{
|
|
/* End of Reception Transfer */
|
|
if ( _PioCaptureCopy->CbkEndReception != NULL )
|
|
{
|
|
_PioCaptureCopy->CbkEndReception( _PioCaptureCopy );
|
|
}
|
|
else
|
|
{
|
|
// TRACE_DEBUG("IT PIO Capture End of Reception Transfer received (no callback)\n\r");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Disable Interupt of the PIO Capture
|
|
* \param itToDisable : Interrupt to disable
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
void PIO_CaptureDisableIt( uint32_t itToDisable )
|
|
{
|
|
/* Parallel capture mode is enabled */
|
|
PIOA->PIO_PCIDR = itToDisable;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Enable Interupt of the PIO Capture
|
|
* \param itToEnable : Interrupt to enable
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
void PIO_CaptureEnableIt( uint32_t itToEnable )
|
|
{
|
|
/* Parallel capture mode is enabled */
|
|
PIOA->PIO_PCIER = itToEnable;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Enable the PIO Capture
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
void PIO_CaptureEnable( void )
|
|
{
|
|
/* PDC: Receive Pointer Register */
|
|
PIOA->PIO_RPR = (uint32_t)_PioCaptureCopy->pData ;
|
|
/* PDC: Receive Counter Register */
|
|
/* Starts peripheral data transfer if corresponding channel is active */
|
|
PIOA->PIO_RCR = PIO_RCR_RXCTR(_PioCaptureCopy->dPDCsize) ;
|
|
|
|
/* Parallel capture mode is enabled */
|
|
PIOA->PIO_PCMR |= PIO_PCMR_PCEN ;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Disable the PIO Capture
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
void PIO_CaptureDisable( void )
|
|
{
|
|
/* Parallel capture mode is disabled */
|
|
PIOA->PIO_PCMR &= (uint32_t)(~PIO_PCMR_PCEN) ;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Initialize the PIO Capture
|
|
* Be careful to configure the PDC before enable interrupt on pio capture.
|
|
* Otherway, the pdc will go in interrupt handler continuously.
|
|
* \param dsize :
|
|
* 0 = The reception data in the PIO_PCRHR register is a BYTE (8-bit).
|
|
* 1 = The reception data in the PIO_PCRHR register is a HALF-WORD (16-bit).
|
|
* 2/3 = The reception data in the PIO_PCRHR register is a WORD (32-bit).
|
|
* \param alwaysSampling: ALWYS: Parallel Capture Mode Always Sampling
|
|
* 0 = The parallel capture mode samples the data when both data enables are active.
|
|
* 1 = The parallel capture mode samples the data whatever the data enables are.
|
|
* \param halfSampling: HALFS: Parallel Capture Mode Half Sampling
|
|
* 0 = The parallel capture mode samples all the data.
|
|
* 1 = The parallel capture mode samples the data only one time out of two.
|
|
* \param modeFirstSample: FRSTS: Parallel Capture Mode First Sample
|
|
* This bit is useful only if the HALFS bit is set to 1. If data are numbered
|
|
* in the order that they are received with an index from 0 to n:
|
|
* 0 = Only data with an even index are sampled.
|
|
* 1 = Only data with an odd index are sampled.
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
void PIO_CaptureInit( SPioCaptureInit *pInit )
|
|
{
|
|
PMC_EnablePeripheral( ID_PIOA );
|
|
|
|
assert( (pInit->dsize < 0x4) ) ;
|
|
assert( (pInit->dPDCsize <= PIO_RPR_RXPTR_Msk) ) ;
|
|
assert( (pInit->alwaysSampling < 2) );
|
|
assert( (pInit->halfSampling < 2) );
|
|
assert( (pInit->modeFirstSample < 2) );
|
|
|
|
/* PDC: Transfer Control Register */
|
|
/* Disables the PDC transmitter channel requests */
|
|
PIOA->PIO_PTCR = PIO_PTCR_RXTDIS;
|
|
/* PDC: Receive Pointer Register */
|
|
PIOA->PIO_RPR = (uint32_t)pInit->pData;
|
|
/* PDC: Receive Counter Register */
|
|
/* Starts peripheral data transfer if corresponding channel is active */
|
|
PIOA->PIO_RCR = PIO_RCR_RXCTR(pInit->dPDCsize);
|
|
|
|
/* PDC: Transfer Control Register */
|
|
/* Enables PDC receiver channel requests if RXTDIS is not set */
|
|
PIOA->PIO_PTCR = PIO_PTCR_RXTEN ;
|
|
|
|
|
|
/* Copy the API structure for interrupt handler */
|
|
_PioCaptureCopy = pInit;
|
|
/* PIO Parallel Capture Mode */
|
|
PIOA->PIO_PCMR = PIO_PCMR_DSIZE(pInit->dsize)
|
|
| ((pInit->alwaysSampling<<9) & PIO_PCMR_ALWYS)
|
|
| ((pInit->halfSampling<<10) & PIO_PCMR_HALFS)
|
|
| ((pInit->modeFirstSample<<11) & PIO_PCMR_FRSTS);
|
|
|
|
if ( pInit->CbkDataReady != NULL )
|
|
{
|
|
PIOA->PIO_PCIER = PIO_PCISR_DRDY;
|
|
}
|
|
|
|
if ( pInit->CbkOverrun != NULL )
|
|
{
|
|
PIOA->PIO_PCIER = PIO_PCISR_OVRE;
|
|
}
|
|
|
|
if ( pInit->CbkEndReception != NULL )
|
|
{
|
|
PIOA->PIO_PCIER = PIO_PCISR_ENDRX;
|
|
}
|
|
|
|
if ( pInit->CbkBuffFull != NULL )
|
|
{
|
|
PIOA->PIO_PCIER = PIO_PCISR_RXBUFF;
|
|
}
|
|
// else
|
|
// {
|
|
// TRACE_INFO("No interruption, no callback\n\r");
|
|
// }
|
|
|
|
}
|
|
|