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151 lines
3.9 KiB
151 lines
3.9 KiB
/** @addtogroup prs_file PRS peripheral API
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* @ingroup peripheral_apis
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* @brief EFM32 Peripheral Reflex System (PRS).
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* The Peripheral Reflex System (PRS) system is a network which allows the
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* different peripheral modules to communicate directly with each other
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* without involving the CPU.
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2015 Kuldeep Singh Dhaka <kuldeepdhaka9@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/efm32/prs.h>
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/**@{*/
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/**
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* Enable PRS output to GPIO.
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_set_output_loc()
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*/
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void prs_enable_gpio_output(enum prs_ch ch)
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{
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PRS_ROUTE |= PRS_ROUTE_CHxPEN(ch);
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}
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/**
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* Disable PRS output to GPIO.
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_set_output_loc()
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*/
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void prs_disable_gpio_output(enum prs_ch ch)
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{
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PRS_ROUTE &= ~PRS_ROUTE_CHxPEN(ch);
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}
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/**
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* Location of the PRS to be output on GPIO.
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* @param[in] loc location (use PRS_ROUTE_LOCATION_LOCx)
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* @see prs_set_output_loc()
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*/
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void prs_set_output_loc(uint32_t loc)
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{
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PRS_ROUTE = (PRS_ROUTE & ~PRS_ROUTE_LOCATION_MASK) | loc;
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}
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/**
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* Generate software pulse.
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* @param[in] ch Channel (use PRS_CHx)
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* @note the final output is dependent on "software level" value of the channel
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* @see prs_software_level_high()
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* @see prs_software_level_low()
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*/
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void prs_software_pulse(enum prs_ch ch)
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{
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PRS_SWPULSE = PRS_SWPULSE_CHxPULSE(ch);
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}
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/**
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* HIGH is XOR'ed with the corresponding bit in the software-pulse and
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* the PRS input signal to generate.
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_software_level_low()
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* @see prs_software_pulse()
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*/
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void prs_software_level_high(enum prs_ch ch)
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{
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PRS_SWLEVEL |= PRS_SWLEVEL_CHxLEVEL(ch);
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}
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/**
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* LOW is XOR'ed with the corresponding bit in the software-pulse and
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* the PRS input signal to generate.
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_software_level_high()
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* @see prs_software_pulse()
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*/
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void prs_software_level_low(enum prs_ch ch)
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{
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PRS_SWLEVEL &= ~PRS_SWLEVEL_CHxLEVEL(ch);
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}
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/**
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* disable synchronization of this channel reflex signal
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_disable_async()
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*/
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void prs_enable_async(enum prs_ch ch)
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{
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PRS_CHx_CTRL(ch) |= PRS_CH_CTRL_ASYNC;
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}
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/**
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* enable synchronization of this channel reflex signal
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* @param[in] ch Channel (use PRS_CHx)
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* @see prs_disable_async()
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*/
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void prs_disable_async(enum prs_ch ch)
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{
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PRS_CHx_CTRL(ch) &= ~PRS_CH_CTRL_ASYNC;
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}
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/**
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* Edge detection for the channel
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* @param[in] ch Channel (use PRS_CHx)
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* @param[in] edge Edge (use PRS_CH_CTRL_EDSEL_*)
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*/
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void prs_set_edge(enum prs_ch ch, uint32_t edge)
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{
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PRS_CHx_CTRL(ch) = (PRS_CHx_CTRL(ch) & ~PRS_CH_CTRL_EDSEL_MASK) | edge;
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}
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/**
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* Source for the channel
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* @param[in] ch Channel (use PRS_CHx)
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* @param[in] source Source (use PRS_CH_CTRL_SOURCESEL_*)
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* @see prs_set_signal()
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*/
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void prs_set_source(enum prs_ch ch, uint32_t source)
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{
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PRS_CHx_CTRL(ch) = (PRS_CHx_CTRL(ch) & ~PRS_CH_CTRL_SOURCESEL_MASK)
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| source;
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}
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/**
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* Source for the channel
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* @param[in] ch Channel (use PRS_CHx)
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* @param[in] signal Signal (use PRS_CH_CTRL_SIGSEL_*)
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* @see prs_set_source()
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*/
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void prs_set_signal(enum prs_ch ch, uint32_t signal)
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{
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PRS_CHx_CTRL(ch) = (PRS_CHx_CTRL(ch) & ~PRS_CH_CTRL_SIGSEL_MASK)
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| signal;
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}
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/**@}*/
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