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*/ | |
/** \addtogroup acc_module Working with ACC | |
* \ingroup peripherals_module | |
* The ACC driver provides the interface to configure and use the ACC peripheral.\n | |
* | |
* It applies comparison on two inputs and gives a compare output. | |
* | |
* To Enable a ACC Comparison,the user has to follow these few steps: | |
* <ul> | |
* <li> Enable ACC peripheral clock by setting the corresponding bit in PMC_PCER1 | |
* (PMC Peripheral Clock Enable Register 1) | |
* </li> | |
* <li> Reset the controller by asserting ACC_CR_SWRST in ACC_CR(ACC Control Register) | |
</li> | |
* <li> Configure the mode as following steps: </li> | |
* -# Select inputs for SELMINUS and SELPLUS in ACC_MR (ACC Mode Register). | |
* -# Enable Analog Comparator by setting ACEN in ACC_MR. | |
* -# Configure Edge Type to detect different compare output. | |
* </li> | |
* <li> Wait until the automatic mask period expires by polling MASK bit in | |
* ACC_ISR. | |
* </ul> | |
* | |
* For more accurate information, please look at the ACC section of the | |
* Datasheet. | |
* | |
* Related files :\n | |
* \ref acc.c\n | |
* \ref acc.h\n | |
*/ | |
/*@{*/ | |
/*@}*/ | |
/** | |
* \file | |
* | |
* Implementation of Analog Comparator Controller (ACC). | |
* | |
*/ | |
/*---------------------------------------------------------------------------- | |
* Headers | |
*----------------------------------------------------------------------------*/ | |
#include "chip.h" | |
/*---------------------------------------------------------------------------- | |
* Exported functions | |
*----------------------------------------------------------------------------*/ | |
/** | |
* \brief Initialize the ACC controller | |
* | |
* \param pAcc Pointer to an Acc instance. | |
* \param idAcc ACC identifier | |
* \param ucSelplus input connected to inp, 0~7 | |
* \param ucSelminus input connected to inm,0~7 | |
* \param wAc_en Analog comprator enabled/disabled | |
* \param wEdge CF flag triggering mode | |
* \param wInvert INVert comparator output,use pattern defined in the device header file | |
*/ | |
extern void ACC_Configure( Acc *pAcc, uint8_t idAcc, uint8_t ucSelplus, uint8_t ucSelminus, | |
uint16_t wAc_en, uint16_t wEdge, uint16_t wInvert ) | |
{ | |
/* Enable peripheral clock*/ | |
PMC->PMC_PCER1 = 1 << (idAcc - 32) ; | |
/* Reset the controller */ | |
pAcc->ACC_CR |= ACC_CR_SWRST ; | |
/* Write to the MR register */ | |
ACC_CfgModeReg( pAcc, | |
( (ucSelplus<<ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk ) | | |
( (ucSelminus<<ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk ) | | |
( (wAc_en<<8) & ACC_MR_ACEN ) | | |
( (wEdge<<ACC_MR_EDGETYP_Pos) & ACC_MR_EDGETYP_Msk ) | | |
( (wInvert<<12) & ACC_MR_INV ) ) ; | |
/* set hysteresis and current option*/ | |
pAcc->ACC_ACR = (ACC_ACR_ISEL_HISP | ((0x01 << ACC_ACR_HYST_Pos) & ACC_ACR_HYST_Msk)); | |
/* Automatic Output Masking Period*/ | |
while ( pAcc->ACC_ISR & (uint32_t)ACC_ISR_MASK ) ; | |
} | |
/** | |
* Return the Channel Converted Data | |
* \param pAcc Pointer to an Acc instance. | |
* \param selplus input applied on ACC SELPLUS | |
* \param selminus input applied on ACC SELMINUS | |
*/ | |
extern void ACC_SetComparisonPair( Acc *pAcc, uint8_t ucSelplus, uint8_t ucSelminus ) | |
{ | |
uint32_t dwTemp ; | |
assert( ucSelplus < 8 && ucSelminus < 8 ) ; | |
dwTemp = pAcc->ACC_MR ; | |
pAcc->ACC_MR = dwTemp & (uint32_t) ((~ACC_MR_SELMINUS_Msk) & (~ACC_MR_SELPLUS_Msk)); | |
pAcc->ACC_MR |= ( ((ucSelplus << ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk) | | |
((ucSelminus << ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk) ) ; | |
} | |
/** | |
* Return Comparison Result | |
* \param pAcc Pointer to an Acc instance. | |
* \param status value of ACC_ISR | |
*/ | |
extern uint32_t ACC_GetComparisonResult( Acc *pAcc, uint32_t dwStatus ) | |
{ | |
uint32_t dwTemp = pAcc->ACC_MR ; | |
if ( (dwTemp & ACC_MR_INV) == ACC_MR_INV ) | |
{ | |
if ( dwStatus & ACC_ISR_SCO ) | |
{ | |
return 0 ; /* inn>inp*/ | |
} | |
else | |
{ | |
return 1 ;/* inp>inn*/ | |
} | |
} | |
else | |
{ | |
if ( dwStatus & ACC_ISR_SCO ) | |
{ | |
return 1 ; /* inp>inn*/ | |
} | |
else | |
{ | |
return 0 ;/* inn>inp*/ | |
} | |
} | |
} | |