ChibiOS 2.6.8, until I can figure out where to get it from git.

2026-09-14 10:39:30 +00:00 · 2015-07-08 08:40:23 -07:00
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+/*
+    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 GPT GPT Driver
+ * @brief   Generic GPT Driver.
+ * @details This module implements a generic GPT (General Purpose Timer)
+ *          driver. The timer can be programmed in order to trigger callbacks
+ *          after a specified time period or continuously with a specified
+ *          interval.
+ * @pre     In order to use the GPT driver the @p HAL_USE_GPT option
+ *          must be enabled in @p halconf.h.
+ *
+ * @section gpt_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).
+ * @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="GPT_STOP\nLow Power"];
+    uninit [label="GPT_UNINIT", style="bold"];
+    ready [label="GPT_READY\nClock Enabled"];
+    continuous [label="GPT_CONT..S\nContinuous\nMode"];
+    oneshot [label="GPT_ONESHOT\nOne Shot\nMode"];
+
+    uninit -> stop [label=" gptInit()", constraint=false];
+    stop -> stop [label="\ngptStop()"];
+    stop -> ready [label="\ngptStart()"];
+    ready -> stop [label="\ngptStop()"];
+    ready -> ready [label="\ngptStart()"];
+    ready -> continuous [label="\ngptStartContinuous()"];
+    continuous -> ready [label="\ngptStopTimer()"];
+    continuous -> continuous [label=">callback<"];
+    ready -> oneshot [label="\ngptStartOneShot()\ngptPolledDelay()"];
+    oneshot -> ready [label="\n>callback<\nor\nDelay Over"];
+  }
+ * @enddot
+ *
+ * @section gpt_2 GPT Operations.
+ * This driver abstracts a generic timer composed of:
+ * - A clock prescaler.
+ * - A main up counter.
+ * - A comparator register that resets the main counter to zero when the limit
+ *   is reached. A callback is invoked when this happens.
+ * .
+ * The timer can operate in three different modes:
+ * - <b>Continuous Mode</b>, a periodic callback is invoked until the driver
+ *   is explicitly stopped.
+ * - <b>One Shot Mode</b>, a callback is invoked after the programmed period
+ *   and then the timer automatically stops.
+ * - <b>Delay Mode</b>, the timer is used for inserting a brief delay into
+ *   the execution flow, no callback is invoked in this mode.
+ * .
+ * @ingroup IO
+ */