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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* PPI channels are a way to connect NRF51 EVENTs to TASKs without software
* involvement. They are like SHORTs, except between peripherals.
*
* PPI groups are user-defined sets of channels that can be enabled and disabled
* together.
*/
/*
* Reserve a pre-programmed PPI channel.
*
* Return EC_SUCCESS if ppi_chan is a pre-programmed channel that was not in
* use, otherwise returns EC_ERROR_BUSY.
*/
int ppi_request_pre_programmed_channel(int ppi_chan);
/*
* Reserve an available PPI channel.
*
* Return EC_SUCCESS and set the value of ppi_chan to an available PPI
* channel. If no channel is available, return EC_ERROR_BUSY.
*/
int ppi_request_channel(int *ppi_chan);
/* Release a PPI channel which was reserved with ppi_request_*_channel. */
void ppi_release_channel(int ppi_chan);
/*
* Reserve a PPI group.
*
* Return EC_SUCCESS and set the value of ppi_group to an available PPI
* group. If no group is available, return EC_ERROR_BUSY.
*/
int ppi_request_group(int *ppi_group);
/* Release a PPI channel which was reserved with ppi_request_*_channel. */
void ppi_release_group(int ppi_group);
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