Arti Zirk
054740c5de
subrepo: subdir: "libopencm3" merged: "88e91c9a7cce" upstream: origin: "https://github.com/libopencm3/libopencm3.git" branch: "master" commit: "88e91c9a7cce" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/** @addtogroup ppi_file PPI peripheral API
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*
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* @brief <b>Access functions for the Programmable Peripheral Interconnect </b>
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*
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* @ingroup peripheral_apis
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2016
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* Maxim Sloyko <maxims@google.com>
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*
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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) 2017-2018 Unicore MX project<dev(at)lists(dot)unicore-mx(dot)org>
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* Copyright (C) 2021 Eduard Drusa <ventyl86(at)netkosice(dot)sk>
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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 <stdint.h>
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#include <libopencm3/nrf/ppi.h>
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/**@{*/
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/** @brief Configure PPI Channel.
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*
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* @param[in] chan_num uint8_t Channel number (0-15).
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* @param[in] eep uint32_t Event endpoint. Memory address of the event endpoint.
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* @param[in] tep uint32_t Task endpoint. Memory address of the task endpoint.
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*/
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void ppi_configure_channel(uint8_t chan_num, uint32_t eep, uint32_t tep)
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{
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PPI_CH_EEP(chan_num) = eep;
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PPI_CH_TEP(chan_num) = tep;
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}
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/** @brief Enable PPI channels, given the channels mask.
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*
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* @param[in] channels uint32_t mask of the channels to enable.
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*/
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void ppi_enable_channels(uint32_t channels)
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{
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PPI_CHENSET = channels;
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}
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/** @brief Disable PPI channels, given the channels mask.
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*
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* @param[in] channels uint32_t mask of the channels to disable.
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*/
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void ppi_disable_channels(uint32_t channels)
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{
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PPI_CHENCLR = channels;
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}
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/** @brief Set channels group, given channels mask.
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*
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* @param[in] group uint8_t group number (0-3)
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* @param[in] channels uint32_t mask of the channels to group together.
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*/
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void ppi_set_group(uint8_t group, uint32_t channels)
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{
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PPI_CHG(group) = channels;
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}
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/** @brief Enable previously configured group of channels.
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*
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* @param[in] group uint8_t group number (0-3)
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*/
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void ppi_enable_group(uint8_t group)
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{
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PPI_TASK_CHG_EN(group) = 1;
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}
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/** @brief Disable previously configured group of channels.
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*
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* @param[in] group uint8_t group number (0-3)
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*/
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void ppi_disable_group(uint8_t group)
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{
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PPI_TASK_CHG_DIS(group) = 1;
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}
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/** @brief Configure new channel.
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*
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* This is the alternative API, which requires the caller to store the mask of used channels.
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*
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* @param chan_map uint32_t* The mask of channels that are already in use.
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* For the first call initialize with zero and pass in.
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* @param[in] eep uint32_t Event endpoint.
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* @param[in] tep uint32_t Task endpoint.
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* @param enable bool If true, enable the channel immediately.
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* @return The number of the new channel. If there are no channels available, returns 0xff.
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*/
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uint8_t ppi_add_channel(uint32_t *chan_map, uint32_t eep, uint32_t tep, bool enable)
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{
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/* Find a free channel */
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uint8_t i;
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uint32_t chan_bit;
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for (i = 0, chan_bit = 1; i <= PPI_MAX_PROG_CHANNEL; ++i, chan_bit <<= 1) {
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if (!(chan_bit & *chan_map)) {
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*chan_map |= chan_bit;
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break;
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}
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}
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/* If all channels are taken, return error. */
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if (i > PPI_MAX_PROG_CHANNEL) {
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return 0xff;
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}
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ppi_configure_channel(i, eep, tep);
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if (enable) {
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ppi_enable_channels(chan_bit);
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}
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return i;
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}
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/** @brief Disable channel and remove it from the map of used channels.
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*
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* This is the alternative API, which requires the caller to store the mask of used channels.
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*
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* @param chan_map uint32_t* The mask of channels that are already in use.
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* For the first call initialize with zero and pass in.
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* @param[in] chan_num uint8_t the number of the channel to remove from the map.
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*/
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void ppi_remove_channel(uint32_t *chan_map, uint8_t chan_num)
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{
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ppi_disable_channels(PPI_CH(chan_num));
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*chan_map &= ~(PPI_CH(chan_num));
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}
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/**@}*/
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