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