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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"
#include "acc.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 comparator 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 ucSelplus input applied on ACC SELPLUS
* \param ucSelminus 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 dwStatus 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*/
}
}
}
