102 lines
4.1 KiB
Plaintext
102 lines
4.1 KiB
Plaintext
/*
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012,2013 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS/RT.
|
|
|
|
ChibiOS/RT is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ChibiOS/RT 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
---
|
|
|
|
A special exception to the GPL can be applied should you wish to distribute
|
|
a combined work that includes ChibiOS/RT, without being obliged to provide
|
|
the source code for any proprietary components. See the file exception.txt
|
|
for full details of how and when the exception can be applied.
|
|
*/
|
|
|
|
/**
|
|
* @defgroup SPI SPI Driver
|
|
* @brief Generic SPI Driver.
|
|
* @details This module implements a generic SPI (Serial Peripheral Interface)
|
|
* driver allowing bidirectional and monodirectional transfers,
|
|
* complex atomic transactions are supported as well.
|
|
* @pre In order to use the SPI driver the @p HAL_USE_SPI option
|
|
* must be enabled in @p halconf.h.
|
|
*
|
|
* @section spi_1 Driver State Machine
|
|
* The driver implements a state machine internally, not all the driver
|
|
* functionalities can be used in any moment, any transition not explicitly
|
|
* shown in the following diagram has to be considered an error and shall
|
|
* be captured by an assertion (if enabled).
|
|
* @if LATEX_PDF
|
|
* @dot
|
|
digraph example {
|
|
size="5, 7";
|
|
rankdir="LR";
|
|
node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true",
|
|
width="0.9", height="0.9"];
|
|
edge [fontname=Helvetica, fontsize=8];
|
|
|
|
stop [label="SPI_STOP\nLow Power"];
|
|
uninit [label="SPI_UNINIT", style="bold"];
|
|
ready [label="SPI_READY\nClock Enabled"];
|
|
active [label="SPI_ACTIVE\nBus Active"];
|
|
complete [label="SPI_COMPLETE\nComplete"];
|
|
|
|
uninit -> stop [label="\n spiInit()", constraint=false];
|
|
stop -> ready [label="\nspiStart()"];
|
|
ready -> ready [label="\nspiSelect()\nspiUnselect()\nspiStart()"];
|
|
ready -> stop [label="\nspiStop()"];
|
|
stop -> stop [label="\nspiStop()"];
|
|
ready -> active [label="\nspiStartXXXI() (async)\nspiXXX() (sync)"];
|
|
active -> ready [label="\nsync return"];
|
|
active -> complete [label="\nasync callback\n>spc_endcb<"];
|
|
complete -> active [label="\nspiStartXXXI() (async)\nthen\ncallback return"];
|
|
complete -> ready [label="\ncallback return"];
|
|
}
|
|
* @enddot
|
|
* @else
|
|
* @dot
|
|
digraph example {
|
|
rankdir="LR";
|
|
node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
|
|
edge [fontname=Helvetica, fontsize=8];
|
|
|
|
stop [label="SPI_STOP\nLow Power"];
|
|
uninit [label="SPI_UNINIT", style="bold"];
|
|
ready [label="SPI_READY\nClock Enabled"];
|
|
active [label="SPI_ACTIVE\nBus Active"];
|
|
complete [label="SPI_COMPLETE\nComplete"];
|
|
|
|
uninit -> stop [label="\n spiInit()", constraint=false];
|
|
stop -> ready [label="\nspiStart()"];
|
|
ready -> ready [label="\nspiSelect()\nspiUnselect()\nspiStart()"];
|
|
ready -> stop [label="\nspiStop()"];
|
|
stop -> stop [label="\nspiStop()"];
|
|
ready -> active [label="\nspiStartXXX() (async)\nspiXXX() (sync)"];
|
|
active -> ready [label="\nsync return"];
|
|
active -> complete [label="\nasync callback\n>spc_endcb<"];
|
|
complete -> active [label="\nspiStartXXXI() (async)\nthen\ncallback return"];
|
|
complete -> ready [label="\ncallback return"];
|
|
}
|
|
* @enddot
|
|
* @endif
|
|
*
|
|
* The driver is not thread safe for performance reasons, if you need to access
|
|
* the SPI bus from multiple threads then use the @p spiAcquireBus() and
|
|
* @p spiReleaseBus() APIs in order to gain exclusive access.
|
|
*
|
|
* @ingroup IO
|
|
*/
|