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4e920054f9
Programmable Peripheral Interconnect is a shared resource. This CL adds code for allocating PPIs to devices. BUG=None BRANCH=None TEST=Modify the I2C code to use this PPI allocation code and test I2C communication (using experimental MXT touch controller code) Change-Id: I8ec27867d041982ef18e8515d6434c5de2c189c5 Signed-off-by: Myles Watson <mylesgw@google.com> Reviewed-on: https://chromium-review.googlesource.com/361405 Commit-Ready: Myles Watson <mylesgw@chromium.org> Tested-by: Myles Watson <mylesgw@chromium.org> Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Levi Oliver <levio@google.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/*
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* PPI channels are a way to connect NRF51 EVENTs to TASKs without software
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* involvement. They are like SHORTs, except between peripherals.
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*
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* PPI groups are user-defined sets of channels that can be enabled and disabled
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* together.
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*/
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/*
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* Reserve a pre-programmed PPI channel.
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*
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* Return EC_SUCCESS if ppi_chan is a pre-programmed channel that was not in
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* use, otherwise returns EC_ERROR_BUSY.
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*/
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int ppi_request_pre_programmed_channel(int ppi_chan);
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/*
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* Reserve an available PPI channel.
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*
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* Return EC_SUCCESS and set the value of ppi_chan to an available PPI
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* channel. If no channel is available, return EC_ERROR_BUSY.
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*/
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int ppi_request_channel(int *ppi_chan);
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/* Release a PPI channel which was reserved with ppi_request_*_channel. */
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void ppi_release_channel(int ppi_chan);
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/*
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* Reserve a PPI group.
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*
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* Return EC_SUCCESS and set the value of ppi_group to an available PPI
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* group. If no group is available, return EC_ERROR_BUSY.
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*/
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int ppi_request_group(int *ppi_group);
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/* Release a PPI channel which was reserved with ppi_request_*_channel. */
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void ppi_release_group(int ppi_group);
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