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131 lines
5.2 KiB
C
131 lines
5.2 KiB
C
/***************************************************************************//**
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* @file em_prs.c
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* @brief Peripheral Reflex System (PRS) Peripheral API
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* @version 4.3.0
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*******************************************************************************
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* @section License
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* <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
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* obligation to support this Software. Silicon Labs 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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* Silicon Labs 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 "em_prs.h"
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#if defined(PRS_COUNT) && (PRS_COUNT > 0)
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#include "em_assert.h"
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/***************************************************************************//**
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* @addtogroup emlib
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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
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* @details
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* This module contains functions to control the PRS peripheral of Silicon
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* Labs 32-bit MCUs and SoCs. The PRS allows configurable, fast and autonomous
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* communication between peripherals on the MCU or SoC.
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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 < PRS_CHAN_COUNT);
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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( PRS_CH_CTRL_ASYNC )
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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 not supported on EFM32GxxxFyyy parts.
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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 < PRS_CHAN_COUNT);
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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 emlib) */
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#endif /* defined(PRS_COUNT) && (PRS_COUNT > 0) */
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