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Diffstat (limited to 'bsps/arm/atsam/contrib/libraries/libchip/source/pio_capture.c')
| -rw-r--r-- | bsps/arm/atsam/contrib/libraries/libchip/source/pio_capture.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/bsps/arm/atsam/contrib/libraries/libchip/source/pio_capture.c b/bsps/arm/atsam/contrib/libraries/libchip/source/pio_capture.c new file mode 100644 index 0000000000..10528c1bcc --- /dev/null +++ b/bsps/arm/atsam/contrib/libraries/libchip/source/pio_capture.c @@ -0,0 +1,255 @@ +/* ---------------------------------------------------------------------------- */ +/* 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: + * <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. + * + * <b>API Usage:</b> + * + * -# 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 <assert.h> + +#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; +} + |