mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-14 20:18:13 +00:00
118 lines
4.4 KiB
Plaintext
Executable File
118 lines
4.4 KiB
Plaintext
Executable File
/*
|
|
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/>.
|
|
*/
|
|
|
|
/**
|
|
* @defgroup ICU ICU Driver
|
|
* @brief Generic ICU Driver.
|
|
* @details This module implements a generic ICU (Input Capture Unit) driver.
|
|
* @pre In order to use the ICU driver the @p HAL_USE_ICU option
|
|
* must be enabled in @p halconf.h.
|
|
*
|
|
* @section icu_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=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
|
|
edge [fontname=Sans, fontsize=8];
|
|
|
|
stop [label="ICU_STOP\nLow Power"];
|
|
uninit [label="ICU_UNINIT", style="bold"];
|
|
ready [label="ICU_READY\nClock Enabled"];
|
|
waiting [label="ICU_WAITING"];
|
|
active [label="ICU_ACTIVE"];
|
|
idle [label="ICU_IDLE"];
|
|
|
|
uninit -> stop [label=" icuInit()", constraint=false];
|
|
stop -> stop [label="\nicuStop()"];
|
|
stop -> ready [label="\nicuStart()"];
|
|
ready -> stop [label="\nicuStop()"];
|
|
ready -> ready [label="\nicuStart()\nicuDisable()"];
|
|
ready -> waiting [label="\nicuEnable()"];
|
|
waiting -> active [label="\nStart Front"];
|
|
waiting -> ready [label="\nicuDisable()"];
|
|
waiting -> waiting [label="\nStop Front"];
|
|
active -> idle [label="\nStop Front\n>width_cb<"];
|
|
active -> ready [label="\nicuDisable()\nicuDisableI()"];
|
|
idle -> active [label="\nStart Front\n>period_cb<"];
|
|
idle -> ready [label="\nicuDisable()\nicuDisableI()"];
|
|
}
|
|
* @enddot
|
|
* @else
|
|
* @dot
|
|
digraph example {
|
|
rankdir="LR";
|
|
|
|
node [shape=circle, fontname=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
|
|
edge [fontname=Sans, fontsize=8];
|
|
|
|
stop [label="ICU_STOP\nLow Power"];
|
|
uninit [label="ICU_UNINIT", style="bold"];
|
|
ready [label="ICU_READY\nClock Enabled"];
|
|
waiting [label="ICU_WAITING"];
|
|
active [label="ICU_ACTIVE"];
|
|
idle [label="ICU_IDLE"];
|
|
|
|
uninit -> stop [label=" icuInit()", constraint=false];
|
|
stop -> stop [label="\nicuStop()"];
|
|
stop -> ready [label="\nicuStart()"];
|
|
ready -> stop [label="\nicuStop()"];
|
|
ready -> ready [label="\nicuStart()\nicuDisable()"];
|
|
ready -> waiting [label="\nicuEnable()"];
|
|
waiting -> active [label="\nStart Front"];
|
|
waiting -> ready [label="\nicuDisable()"];
|
|
waiting -> waiting [label="\nStop Front"];
|
|
active -> idle [label="\nStop Front\n>width_cb<"];
|
|
active -> ready [label="\nicuDisable()\nicuDisableI()"];
|
|
idle -> active [label="\nStart Front\n>period_cb<"];
|
|
idle -> ready [label="\nicuDisable()\nicuDisableI()"];
|
|
}
|
|
* @enddot
|
|
* @endif
|
|
*
|
|
* @section icu_2 ICU Operations.
|
|
* This driver abstracts a generic Input Capture Unit composed of:
|
|
* - A clock prescaler.
|
|
* - A main up counter.
|
|
* - Two capture registers triggered by the rising and falling edges on
|
|
* the sampled input.
|
|
* .
|
|
* The ICU unit can be programmed to synchronize on the rising or falling
|
|
* edge of the sample input:
|
|
* - <b>ICU_INPUT_ACTIVE_HIGH</b>, a rising edge is the start signal.
|
|
* - <b>ICU_INPUT_ACTIVE_LOW</b>, a falling edge is the start signal.
|
|
* .
|
|
* After the activation the ICU unit can be in one of the following
|
|
* states at any time:
|
|
* - <b>ICU_WAITING</b>, waiting the first start signal.
|
|
* - <b>ICU_ACTIVE</b>, after a start signal.
|
|
* - <b>ICU_IDLE</b>, after a stop signal.
|
|
* .
|
|
* Callbacks are invoked when start or stop signals occur.
|
|
*
|
|
* @ingroup IO
|
|
*/
|