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/** \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;
}
