/* ---------------------------------------------------------------------------- */ /* Atmel Microcontroller Software Support */ /* SAM Software Package License */ /* ---------------------------------------------------------------------------- */ /* Copyright (c) 2015, Atmel Corporation */ /* */ /* All rights reserved. */ /* */ /* Redistribution and use in source and binary forms, with or without */ /* modification, are permitted provided that the following condition is 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 * \ingroup peripherals_module * 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: * * * For more accurate information, please look at the PIO Parallel Capture Mode * section of the Datasheet. * * API Usage: * * -# Configurate the interrupt for PIOA, can be done by * PIO_InitializeInterrupts() * -# Initialize the PIO Parallel Capture API by filing the SpioCaptureInit * structure * options: * - alwaysSampling: for sample data with or without take in account * ENABLE pins. * - halfSampling: for sample all data or only one time out of two * -# Call PIO_CaptureInit() for init and enable the PDC, init the PIO capture. * -# Call PIO_CaptureEnable() for enable the PIO Parallel Capture. * -# When an interrupt is received, the PIO_CaptureHandler() is call and the * respective callback is launch. * -# When the transfer is complete, the user need to disable interrupt with * PIO_CaptureDisableIt(). Otherwise, the PDC will send an interrupt. * -# The data receive by the PIO Parallel Capture is inside the buffer passed * in the PIO_CaptureInit(). * * Related files :\n * \ref pio_capture.c\n * \ref pio_capture.h\n */ /*@{*/ /*@}*/ /** * \file * * Implementation of PIO Parallel Capture. * */ /*---------------------------------------------------------------------------- * Headers *----------------------------------------------------------------------------*/ #include "chip.h" #include #define PIO_PCISR_RXBUFF (0x1u<<3) #define PIO_PCISR_ENDRX (0x1u<<2) /*---------------------------------------------------------------------------- * 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; uint32_t k; /* Read the status register*/ pio_captureSr = PIOA->PIO_PCISR; k = pio_captureSr; pio_captureSr = k & 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 Interrupt 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 Interrupt 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 * \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->alwaysSampling < 2)); assert((pInit->halfSampling < 2)); assert((pInit->modeFirstSample < 2)); /* Copy the API structure for interrupt handler */ _PioCaptureCopy = pInit; 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; }