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/** \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 <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"); | |
// } | |
} | |