91 lines
3.6 KiB
Plaintext
91 lines
3.6 KiB
Plaintext
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/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @defgroup SPI SPI Driver
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* @brief Generic SPI Driver.
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* @details This module implements a generic SPI (Serial Peripheral Interface)
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* driver allowing bidirectional and monodirectional transfers,
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* complex atomic transactions are supported as well.
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* @pre In order to use the SPI driver the @p HAL_USE_SPI option
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* must be enabled in @p halconf.h.
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*
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* @section spi_1 Driver State Machine
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* The driver implements a state machine internally, not all the driver
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* functionalities can be used in any moment, any transition not explicitly
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* shown in the following diagram has to be considered an error and shall
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* be captured by an assertion (if enabled).
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* @if LATEX_PDF
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* @dot
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digraph example {
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size="5, 7";
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rankdir="LR";
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node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true",
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width="0.9", height="0.9"];
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edge [fontname=Helvetica, fontsize=8];
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stop [label="SPI_STOP\nLow Power"];
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uninit [label="SPI_UNINIT", style="bold"];
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ready [label="SPI_READY\nClock Enabled"];
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active [label="SPI_ACTIVE\nBus Active"];
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complete [label="SPI_COMPLETE\nComplete"];
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uninit -> stop [label="\n spiInit()", constraint=false];
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stop -> ready [label="\nspiStart()"];
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ready -> ready [label="\nspiSelect()\nspiUnselect()\nspiStart()"];
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ready -> stop [label="\nspiStop()"];
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stop -> stop [label="\nspiStop()"];
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ready -> active [label="\nspiStartXXXI() (async)\nspiXXX() (sync)"];
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active -> ready [label="\nsync return"];
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active -> complete [label="\nasync callback\n>spc_endcb<"];
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complete -> active [label="\nspiStartXXXI() (async)\nthen\ncallback return"];
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complete -> ready [label="\ncallback return"];
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}
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* @enddot
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* @else
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* @dot
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digraph example {
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rankdir="LR";
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node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
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edge [fontname=Helvetica, fontsize=8];
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stop [label="SPI_STOP\nLow Power"];
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uninit [label="SPI_UNINIT", style="bold"];
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ready [label="SPI_READY\nClock Enabled"];
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active [label="SPI_ACTIVE\nBus Active"];
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complete [label="SPI_COMPLETE\nComplete"];
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uninit -> stop [label="\n spiInit()", constraint=false];
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stop -> ready [label="\nspiStart()"];
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ready -> ready [label="\nspiSelect()\nspiUnselect()\nspiStart()"];
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ready -> stop [label="\nspiStop()"];
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stop -> stop [label="\nspiStop()"];
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ready -> active [label="\nspiStartXXX() (async)\nspiXXX() (sync)"];
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active -> ready [label="\nsync return"];
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active -> complete [label="\nasync callback\n>spc_endcb<"];
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complete -> active [label="\nspiStartXXXI() (async)\nthen\ncallback return"];
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complete -> ready [label="\ncallback return"];
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}
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* @enddot
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* @endif
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*
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* The driver is not thread safe for performance reasons, if you need to access
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* the SPI bus from multiple threads then use the @p spiAcquireBus() and
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* @p spiReleaseBus() APIs in order to gain exclusive access.
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*
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* @ingroup HAL_NORMAL_DRIVERS
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*/
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