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/***************************************************************************//**
* @file
* @brief Voltage Comparator (VCMP) peripheral API
* @author Energy Micro AS
* @version 3.0.0
*******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
*******************************************************************************
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
* obligation to support this Software. Energy Micro AS is providing the
* Software "AS IS", with no express or implied warranties of any kind,
* including, but not limited to, any implied warranties of merchantability
* or fitness for any particular purpose or warranties against infringement
* of any proprietary rights of a third party.
*
* Energy Micro AS will not be liable for any consequential, incidental, or
* special damages, or any other relief, or for any claim by any third party,
* arising from your use of this Software.
*
******************************************************************************/
#include "em_assert.h"
#include "em_vcmp.h"
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup VCMP
* @brief Voltage Comparator (VCMP) Peripheral API
* @{
******************************************************************************/
/***************************************************************************//**
* @brief
* Configure and enable Voltage Comparator
*
* @param[in] vcmpInit
* VCMP Initialization structure
******************************************************************************/
void VCMP_Init(const VCMP_Init_TypeDef *vcmpInit)
{
/* Verify input */
EFM_ASSERT((vcmpInit->inactive == 0) || (vcmpInit->inactive == 1));
EFM_ASSERT((vcmpInit->biasProg >= 0) && (vcmpInit->biasProg < 16));
/* Configure Half Bias setting */
if (vcmpInit->halfBias)
{
VCMP->CTRL |= VCMP_CTRL_HALFBIAS;
}
else
{
VCMP->CTRL &= ~(VCMP_CTRL_HALFBIAS);
}
/* Configure bias prog */
VCMP->CTRL &= ~(_VCMP_CTRL_BIASPROG_MASK);
VCMP->CTRL |= (vcmpInit->biasProg << _VCMP_CTRL_BIASPROG_SHIFT);
/* Configure sense for falling edge */
if (vcmpInit->irqFalling)
{
VCMP->CTRL |= VCMP_CTRL_IFALL;
}
else
{
VCMP->CTRL &= ~(VCMP_CTRL_IFALL);
}
/* Configure sense for rising edge */
if (vcmpInit->irqRising)
{
VCMP->CTRL |= VCMP_CTRL_IRISE;
}
else
{
VCMP->CTRL &= ~(VCMP_CTRL_IRISE);
}
/* Configure warm-up time */
VCMP->CTRL &= ~(_VCMP_CTRL_WARMTIME_MASK);
VCMP->CTRL |= (vcmpInit->warmup << _VCMP_CTRL_WARMTIME_SHIFT);
/* Configure hysteresis */
switch (vcmpInit->hyst)
{
case vcmpHyst20mV:
VCMP->CTRL |= VCMP_CTRL_HYSTEN;
break;
case vcmpHystNone:
VCMP->CTRL &= ~(VCMP_CTRL_HYSTEN);
break;
default:
break;
}
/* Configure inactive output value */
VCMP->CTRL |= (vcmpInit->inactive << _VCMP_CTRL_INACTVAL_SHIFT);
/* Configure trigger level */
VCMP_TriggerSet(vcmpInit->triggerLevel);
/* Enable or disable VCMP */
if (vcmpInit->enable)
{
VCMP->CTRL |= VCMP_CTRL_EN;
}
else
{
VCMP->CTRL &= ~(VCMP_CTRL_EN);
}
/* If Low Power Reference is enabled, wait until VCMP is ready */
/* before enabling it, see reference manual for deatils */
/* Configuring Low Power Ref without enable has no effect */
if(vcmpInit->lowPowerRef && vcmpInit->enable)
{
/* Poll for VCMP ready */
while(!VCMP_Ready());
VCMP_LowPowerRefSet(vcmpInit->lowPowerRef);
}
/* Clear edge interrupt */
VCMP_IntClear(VCMP_IF_EDGE);
}
/***************************************************************************//**
* @brief
* Enable or disable Low Power Reference setting
*
* @param[in] enable
* If true, enables low power reference, if false disable low power reference
******************************************************************************/
void VCMP_LowPowerRefSet(bool enable)
{
if (enable)
{
VCMP->INPUTSEL |= VCMP_INPUTSEL_LPREF;
}
else
{
VCMP->INPUTSEL &= ~(VCMP_INPUTSEL_LPREF);
}
}
/***************************************************************************//**
* @brief
* Configure trigger level of voltage comparator
*
* @param[in] level
* Trigger value, in range 0-63
******************************************************************************/
void VCMP_TriggerSet(int level)
{
/* Trigger range is 6 bits, value from 0-63 */
EFM_ASSERT((level > 0) && (level < 64));
/* Set trigger level */
VCMP->INPUTSEL = (VCMP->INPUTSEL & ~(_VCMP_INPUTSEL_TRIGLEVEL_MASK)) |
(level << _VCMP_INPUTSEL_TRIGLEVEL_SHIFT);
}
/** @} (end addtogroup VCMP) */
/** @} (end addtogroup EM_Library) */
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