forked from Imagelibrary/rtems
256 lines
10 KiB
C
256 lines
10 KiB
C
/* ---------------------------------------------------------------------------- */
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/* Atmel Microcontroller Software Support */
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/* SAM Software Package License */
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/* ---------------------------------------------------------------------------- */
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/* Copyright (c) 2015, Atmel Corporation */
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/* */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following condition is met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, */
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/* this list of conditions and the disclaimer below. */
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/* */
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/* Atmel's name may not be used to endorse or promote products derived from */
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/* this software without specific prior written permission. */
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/* */
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/* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */
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/* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */
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/* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */
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/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
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/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */
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/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* ---------------------------------------------------------------------------- */
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/** \addtogroup pio_capture_module Working with PIO Parallel Capture Mode
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* \ingroup peripherals_module
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* The PIO Parallel Capture Mode driver provides the interface to configure
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* and use the PIO Parallel Capture Mode peripheral.\n
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*
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* The PIO Controller integrates an interface able to read data from a CMOS digital
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* image sensor, a high-speed parallel ADC, a DSP synchronous port in synchronous
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* mode, etc.... For better understanding and to ease reading, the following
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* description uses an example with a CMOS digital image sensor
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*
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* To use the PIO Parallel Capture, the user has to follow these few steps:
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* <ul>
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* <li> Enable PIOA peripheral clock </li>
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* <li> Configure the PDC </li>
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* <li> Configure the PIO Capture interrupt </li>
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* <li> Enable the PDC </li>
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* <li> Enable the PIO Capture </li>
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* <li> Wait for interrupt </li>
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* <li> Disable the interrupt </li>
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* <li> Read the DATA </li>
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* </ul>
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*
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* For more accurate information, please look at the PIO Parallel Capture Mode
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* section of the Datasheet.
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*
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* <b>API Usage:</b>
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*
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* -# Configurate the interrupt for PIOA, can be done by
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* PIO_InitializeInterrupts()
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* -# Initialize the PIO Parallel Capture API by filing the SpioCaptureInit
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* structure
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* options:
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* - alwaysSampling: for sample data with or without take in account
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* ENABLE pins.
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* - halfSampling: for sample all data or only one time out of two
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* -# Call PIO_CaptureInit() for init and enable the PDC, init the PIO capture.
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* -# Call PIO_CaptureEnable() for enable the PIO Parallel Capture.
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* -# When an interrupt is received, the PIO_CaptureHandler() is call and the
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* respective callback is launch.
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* -# When the transfer is complete, the user need to disable interrupt with
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* PIO_CaptureDisableIt(). Otherwise, the PDC will send an interrupt.
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* -# The data receive by the PIO Parallel Capture is inside the buffer passed
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* in the PIO_CaptureInit().
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*
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* Related files :\n
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* \ref pio_capture.c\n
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* \ref pio_capture.h\n
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*/
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/*@{*/
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/*@}*/
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/**
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* \file
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*
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* Implementation of PIO Parallel Capture.
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*
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*/
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "chip.h"
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#include <assert.h>
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#define PIO_PCISR_RXBUFF (0x1u<<3)
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#define PIO_PCISR_ENDRX (0x1u<<2)
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/*----------------------------------------------------------------------------
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* Local Functions
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*----------------------------------------------------------------------------*/
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/** Copy the API structure for interrupt handler */
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static SpioCaptureInit *_PioCaptureCopy;
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/*----------------------------------------------------------------------------
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* Global Functions
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*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------*/
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/**
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* \brief The PIO_CaptureHandler must be called by the PIO Capture Interrupt
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* Service Routine with the corresponding PIO Capture instance.
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*/
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/*----------------------------------------------------------------------------*/
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extern void PIO_CaptureHandler(void)
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{
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volatile uint32_t pio_captureSr;
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uint32_t k;
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/* Read the status register*/
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pio_captureSr = PIOA->PIO_PCISR;
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k = pio_captureSr;
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pio_captureSr = k & PIOA->PIO_PCIMR;
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if (pio_captureSr & PIO_PCISR_DRDY) {
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/* Parallel Capture Mode Data Ready */
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if (_PioCaptureCopy->CbkDataReady != NULL)
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_PioCaptureCopy->CbkDataReady(_PioCaptureCopy);
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else
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TRACE_DEBUG("IT PIO Capture Data Ready received (no callback)\n\r");
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}
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if (pio_captureSr & PIO_PCISR_OVRE) {
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/* Parallel Capture Mode Overrun Error */
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if (_PioCaptureCopy->CbkOverrun != NULL)
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_PioCaptureCopy->CbkOverrun(_PioCaptureCopy);
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else
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TRACE_DEBUG("IT PIO Capture Overrun Error received (no callback)\n\r");
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}
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if (pio_captureSr & PIO_PCISR_RXBUFF) {
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/* Reception Buffer Full */
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if (_PioCaptureCopy->CbkBuffFull != NULL)
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_PioCaptureCopy->CbkBuffFull(_PioCaptureCopy);
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else {
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TRACE_DEBUG("IT PIO Capture Reception Buffer Full received \
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(no callback)\n\r");
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}
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}
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if (pio_captureSr & PIO_PCISR_ENDRX) {
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/* End of Reception Transfer */
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if (_PioCaptureCopy->CbkEndReception != NULL)
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_PioCaptureCopy->CbkEndReception(_PioCaptureCopy);
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else {
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TRACE_DEBUG("IT PIO Capture End of Reception Transfer \
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received (no callback)\n\r");
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}
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}
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Disable Interrupt of the PIO Capture
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* \param itToDisable : Interrupt to disable
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*/
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/*----------------------------------------------------------------------------*/
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void PIO_CaptureDisableIt(uint32_t itToDisable)
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{
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/* Parallel capture mode is enabled */
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PIOA->PIO_PCIDR = itToDisable;
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Enable Interrupt of the PIO Capture
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* \param itToEnable : Interrupt to enable
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*/
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/*----------------------------------------------------------------------------*/
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void PIO_CaptureEnableIt(uint32_t itToEnable)
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{
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/* Parallel capture mode is enabled */
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PIOA->PIO_PCIER = itToEnable;
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Enable the PIO Capture
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*/
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/*----------------------------------------------------------------------------*/
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void PIO_CaptureEnable(void)
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{
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/* PDC: Receive Pointer Register */
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// PIOA->PIO_RPR = (uint32_t)_PioCaptureCopy->pData;
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// /* PDC: Receive Counter Register */
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// /* Starts peripheral data transfer if corresponding channel is active */
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// PIOA->PIO_RCR = PIO_RCR_RXCTR(_PioCaptureCopy->dPDCsize);
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/* Parallel capture mode is enabled */
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PIOA->PIO_PCMR |= PIO_PCMR_PCEN;
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Disable the PIO Capture
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*/
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/*----------------------------------------------------------------------------*/
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void PIO_CaptureDisable(void)
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{
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/* Parallel capture mode is disabled */
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PIOA->PIO_PCMR &= (uint32_t)(~PIO_PCMR_PCEN);
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Initialize the PIO Capture
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* \param dsize :
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* 0 = The reception data in the PIO_PCRHR register is a BYTE (8-bit).
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* 1 = The reception data in the PIO_PCRHR register is a HALF-WORD (16-bit).
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* 2/3 = The reception data in the PIO_PCRHR register is a WORD (32-bit).
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* \param alwaysSampling: ALWYS: Parallel Capture Mode Always Sampling
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* 0 = The parallel capture mode samples the data when both data enables are active.
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* 1 = The parallel capture mode samples the data whatever the data enables are.
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* \param halfSampling: HALFS: Parallel Capture Mode Half Sampling
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* 0 = The parallel capture mode samples all the data.
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* 1 = The parallel capture mode samples the data only one time out of two.
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* \param modeFirstSample: FRSTS: Parallel Capture Mode First Sample
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* This bit is useful only if the HALFS bit is set to 1. If data are numbered
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* in the order that they are received with an index from 0 to n:
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* 0 = Only data with an even index are sampled.
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* 1 = Only data with an odd index are sampled.
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*/
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/*----------------------------------------------------------------------------*/
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void PIO_CaptureInit(SpioCaptureInit *pInit)
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{
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PMC_EnablePeripheral(ID_PIOA);
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assert((pInit->dsize < 0x4));
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assert((pInit->alwaysSampling < 2));
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assert((pInit->halfSampling < 2));
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assert((pInit->modeFirstSample < 2));
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/* Copy the API structure for interrupt handler */
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_PioCaptureCopy = pInit;
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if (pInit->CbkDataReady != NULL)
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PIOA->PIO_PCIER = PIO_PCISR_DRDY;
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if (pInit->CbkOverrun != NULL)
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PIOA->PIO_PCIER = PIO_PCISR_OVRE;
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if (pInit->CbkEndReception != NULL)
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PIOA->PIO_PCIER = PIO_PCISR_ENDRX;
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if (pInit->CbkBuffFull != NULL)
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PIOA->PIO_PCIER = PIO_PCISR_RXBUFF;
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}
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