123 lines
4.9 KiB
C
123 lines
4.9 KiB
C
/***************************************************************************//**
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* @file
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* @brief Peripheral Reflex System (PRS) Peripheral API for EFM32
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* @author Energy Micro AS
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* @version 2.3.2
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* This source code is the property of Energy Micro AS. The source and compiled
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* code may only be used on Energy Micro "EFM32" microcontrollers.
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*
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* This copyright notice may not be removed from the source code nor changed.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#include "efm32_prs.h"
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#include "efm32_assert.h"
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#include "efm32_bitband.h"
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/***************************************************************************//**
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* @addtogroup EFM32_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup PRS
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* @brief Peripheral Reflex System (PRS) Peripheral API for EFM32
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* @{
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******************************************************************************/
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/*******************************************************************************
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************************** GLOBAL FUNCTIONS *******************************
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******************************************************************************/
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/***************************************************************************//**
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* @brief
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* Set source and signal to be used for a channel.
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*
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* @param[in] ch
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* Channel to define signal and source for.
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*
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* @param[in] source
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* Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
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*
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* @param[in] signal
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* Signal (for selected @p source) to use. Use one of PRS_CH_CTRL_SIGSEL_x
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* defines.
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*
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* @param[in] edge
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* Edge (for selected source/signal) to generate pulse for.
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******************************************************************************/
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void PRS_SourceSignalSet(unsigned int ch,
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uint32_t source,
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uint32_t signal,
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PRS_Edge_TypeDef edge)
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{
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EFM_ASSERT(ch < 8);
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PRS->CH[ch].CTRL = (source & _PRS_CH_CTRL_SOURCESEL_MASK) |
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(signal & _PRS_CH_CTRL_SIGSEL_MASK) |
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(uint32_t)edge;
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}
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#if ((defined _EFM32_TINY_FAMILY) || (defined _EFM32_GIANT_FAMILY))
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/***************************************************************************//**
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* @brief
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* Set source and asynchronous signal to be used for a channel.
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*
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* @details
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* Asynchronous reflexes are not clocked on HFPERCLK, and can be used even in
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* EM2/EM3.
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* There is a limitation to reflexes operating in asynchronous mode: they can
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* only be used by a subset of the reflex consumers. Please refer to PRS
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* chapter in the reference manual for the complete list of supported
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* asynchronous signals and consumers.
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*
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* @note
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* This function is only supported on the following device families:
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* @li Tiny Gecko (EFM32TGxxxFxx)
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* @li Giant Gecko (EFM32GGxxxFxxx)
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* In asynchronous mode, the edge detector only works in EM0, hence it shall
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* not be used. The EDSEL parameter in PRS_CHx_CTRL register is set to 0 (OFF)
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* by default.
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*
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* @param[in] ch
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* Channel to define source and asynchronous signal for.
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*
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* @param[in] source
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* Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
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*
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* @param[in] signal
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* Asynchronous signal (for selected @p source) to use. Use one of the
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* PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.
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******************************************************************************/
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void PRS_SourceAsyncSignalSet(unsigned int ch,
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uint32_t source,
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uint32_t signal)
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{
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EFM_ASSERT(ch < 8);
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PRS->CH[ch].CTRL = PRS_CH_CTRL_ASYNC |
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(source & _PRS_CH_CTRL_SOURCESEL_MASK) |
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(signal & _PRS_CH_CTRL_SIGSEL_MASK) |
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PRS_CH_CTRL_EDSEL_OFF;
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}
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#endif
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/** @} (end addtogroup PRS) */
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/** @} (end addtogroup EFM32_Library) */
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