forked from Archive/PX4-Autopilot
Add a header file that defines a standard watchdog timer driver
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4603 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo
parent
6f0589d350
commit
a48bc67382
|
|
@ -2649,3 +2649,5 @@
|
|||
* include/nuttx/usb/usbdev.h, drivers/usbdev/*, arch/*/src/*/*usb*.c:
|
||||
Extend the USB device side interface so that EP0 OUT data can be passed
|
||||
with OUT SETUP requests.
|
||||
* include/nuttx/watchdog.h: Add the definition of a standard watchdog
|
||||
driver interface.
|
||||
|
|
|
|||
|
|
@ -12,7 +12,7 @@
|
|||
<h1><big><font color="#3c34ec">
|
||||
<i>NuttX RTOS Porting Guide</i>
|
||||
</font></big></h1>
|
||||
<p>Last Updated: March 23, 2011</p>
|
||||
<p>Last Updated: April 13, 2011</p>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
|
@ -129,7 +129,8 @@
|
|||
<a href="#analogdrivers">6.3.11 Analog (ADC/DAC) Drivers</a><br>
|
||||
<a href="#pwmdrivers">6.3.12 PWM Drivers</a><br>
|
||||
<a href="#candrivers">6.3.13 CAN Drivers</a><br>
|
||||
<a href="#quadencoder">6.3.14 Quadrature Encoder Drivers</a>
|
||||
<a href="#quadencoder">6.3.14 Quadrature Encoder Drivers</a><br>
|
||||
<a href="#wdogdriver">6.3.15 Watchdog Timer Drivers</a>
|
||||
</ul>
|
||||
<a href="#pwrmgmt">6.4 Power Management</a>
|
||||
<ul>
|
||||
|
|
@ -3261,7 +3262,7 @@ extern void up_ledoff(int led);
|
|||
|
||||
<h3><a name="quadencoder">6.3.14 Quadrature Encoder Drivers</a></h3>
|
||||
<p>
|
||||
NuttX supports only a low-level, two-part Quadrature Driver driver.
|
||||
NuttX supports a low-level, two-part Quadrature Encoder driver.
|
||||
</p>
|
||||
<ol>
|
||||
<li>
|
||||
|
|
@ -3288,6 +3289,35 @@ extern void up_ledoff(int led);
|
|||
</li>
|
||||
</ul>
|
||||
|
||||
<h3><a name="wdogdriver">6.3.15 Watchdog Timer Drivers</a></h3>
|
||||
<p>
|
||||
NuttX supports a low-level, two-part watchdog timer driver.
|
||||
</p>
|
||||
<ol>
|
||||
<li>
|
||||
An "upper half", generic driver that provides the comman watchdog timer interface to application level code, and
|
||||
</li>
|
||||
<li>
|
||||
A "lower half", platform-specific driver that implements the low-level timer controls to implement the watchdog timer functionality.
|
||||
</li>
|
||||
</ol>
|
||||
<p>
|
||||
Files supporting the watchdog timer can be found in the following locations:
|
||||
</p>
|
||||
<ul>
|
||||
<li><b>Interface Definition</b>.
|
||||
The header file for the NuttX watchdog timer driver reside at <code>include/nuttx/watchdog.h</code>.
|
||||
This header file includes both the application level interface to the watchdog timer driver as well as the interface between the "upper half" and "lower half" drivers.
|
||||
The watchdog timer driver uses a standard character driver framework.
|
||||
</li>
|
||||
<li><b>"Upper Half" Driver</b>.
|
||||
The generic, "upper half" watchdog timer driver resides at <code>drivers/watchdog.c</code>.
|
||||
</li>
|
||||
<li><b>"Lower Half" Drivers</b>.
|
||||
Platform-specific watchdog timer drivers reside in <code>arch/</code><i><architecture></i><code>/src/</code><i><chip></i> directory for the specific processor <i><architecture></i> and for the specific <i><chip></i> watchdog timer peripheral devices.
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
<h2><a name="pwrmgmt">6.4 Power Management</a></h2>
|
||||
|
||||
<h3><a name="pmoverview">6.4.1 Overview</a></h3>
|
||||
|
|
|
|||
|
|
@ -89,8 +89,6 @@
|
|||
#define _WDIOCVALID(c) (_IOC_TYPE(c)==_WDIOCBASE)
|
||||
#define _WDIOC(nr) _IOC(_WDIOCBASE,nr)
|
||||
|
||||
#define WDIOC_KEEPALIVE _WDIOC(0x0001) /* Restart the watchdog timer */
|
||||
|
||||
/* NuttX file system ioctl definitions **************************************/
|
||||
|
||||
#define _FIOCVALID(c) (_IOC_TYPE(c)==_FIOCBASE)
|
||||
|
|
|
|||
|
|
@ -79,7 +79,7 @@
|
|||
|
||||
/* IOCTL Commands ***********************************************************/
|
||||
/* The PWM module uses a standard character driver framework. However, since
|
||||
* the PWM driver is a devices control interface and not a data transfer
|
||||
* the PWM driver is a device control interface and not a data transfer
|
||||
* interface, the majority of the functionality is implemented in driver
|
||||
* ioctl calls. The PWM ioctl commands are lised below:
|
||||
*
|
||||
|
|
|
|||
|
|
@ -0,0 +1,250 @@
|
|||
/****************************************************************************
|
||||
* include/nuttx/watchdog.h
|
||||
*
|
||||
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_NUTTX_WATCHDOG_H
|
||||
#define __INCLUDE_NUTTX_WATCHDOG_H
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <nuttx/fs/ioctl.h>
|
||||
|
||||
#ifdef CONFIG_WATCHDOG
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
/* IOCTL Commands ***********************************************************/
|
||||
/* The watchdog driver uses a standard character driver framework. However,
|
||||
* since the watchdog driver is a device control interface and not a data
|
||||
* transfer interface, the majority of the functionality is implemented in
|
||||
* driver ioctl calls. The watchdog ioctl commands are lised below:
|
||||
*
|
||||
* WDIOC_START - Start the watchdog timer
|
||||
* Argument: Ignored
|
||||
* WDIOC_START - Stop the watchdog timer
|
||||
* Argument: Ignored
|
||||
* WDIOC_GETSTATUS - Get the status of the watchdog timer.
|
||||
* Argument: A writeable pointer to struct watchdog_status_s.
|
||||
* WDIOC_SETTIMEOUT - Reset the watchdog timeout to this value
|
||||
* Argument: A 32-bit timeout value in milliseconds.
|
||||
* WDIOC_CAPTURE - Do not reset. Instead, called this handler.
|
||||
* Argument: A pointer to struct watchdog_capture_s.
|
||||
* WDIOC_KEEPALIVE - Reset the watchdog timer ("ping", "pet the dog");
|
||||
* Argument: Ignored
|
||||
*/
|
||||
|
||||
#define WDIOC_START _WDIOC(0x001)
|
||||
#define WDIOC_STOP _WDIOC(0x002)
|
||||
#define WDIOC_GETSTATUS _WDIOC(0x003)
|
||||
#define WDIOC_SETTIMEOUT _WDIOC(0x004)
|
||||
#define WDIOC_CAPTURE _WDIOC(0x005)
|
||||
#define WDIOC_KEEPALIVE _WDIOC(0x006)
|
||||
|
||||
/* Bit Settings *************************************************************/
|
||||
/* Bit settings for the struct watchdog_status_s flags field */
|
||||
|
||||
#define WDFLAGS_ACTIVE (1 << 0) /* 1=The watchdog timer is running */
|
||||
#define WDFLAGS_RESET (1 << 1) /* 1=Reset when the watchog timer expires */
|
||||
#define WDFLAGS_CAPTURE (1 << 2) /* 1=Call the user function when the
|
||||
* watchdog timer expires */
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
/* This is the type of the argument passed to the WDIOC_CAPTURE ioctl */
|
||||
|
||||
struct watchdog_capture_s
|
||||
{
|
||||
CODE xcpt_t newhandler; /* The new watchdog capture handler */
|
||||
CODE xcpt_t oldhandler; /* The previous watchdog capture handler (if any) */
|
||||
};
|
||||
|
||||
/* This is the type of the argument passed to the WDIOC_GETSTATUS ioctl and
|
||||
* and returned by the "lower half" getstatus() method.
|
||||
*/
|
||||
|
||||
struct watchdog_status_s
|
||||
{
|
||||
uint32_t flags; /* See WDFLAGS_* definitions above */
|
||||
uint32_t timeout; /* The current timeout setting (in milliseconds) */
|
||||
uint32_t timeleft; /* Time left until the watchdog expiration
|
||||
* (in milliseconds) */
|
||||
};
|
||||
|
||||
/* This structure provides the "lower-half" driver operations available to
|
||||
* the "upper-half" driver.
|
||||
*/
|
||||
|
||||
struct watchdog_lowerhalf_s;
|
||||
struct watchdog_ops_s
|
||||
{
|
||||
/* Required methods ********************************************************/
|
||||
/* Start the watchdog timer, resetting the time to the current timeout */
|
||||
|
||||
CODE int (*start)(FAR struct watchdog_lowerhalf_s *lower);
|
||||
|
||||
/* Stop the watchdog timer */
|
||||
|
||||
CODE int (*stop)(FAR struct watchdog_lowerhalf_s *lower);
|
||||
|
||||
/* Optional methods ********************************************************/
|
||||
/* Reset the watchdog timer to the current timeout value, prevent any
|
||||
* imminent watchdog timeouts. This is sometimes referred as "pinging" the
|
||||
* watchdog timer or "petting the dog".
|
||||
*/
|
||||
|
||||
CODE int (*keepalive)(FAR struct watchdog_lowerhalf_s *lower);
|
||||
|
||||
/* Get the current watchdog timer status */
|
||||
|
||||
CODE int (*getstatus)(FAR struct watchdog_lowerhalf_s *lower,
|
||||
FAR watchdog_state_s *status);
|
||||
|
||||
/* Set a new timeout value (and reset the watchdog timer) */
|
||||
|
||||
CODE int (*settimeout)(FAR struct watchdog_lowerhalf_s *lower,
|
||||
uint32_t timeout);
|
||||
|
||||
/* Don't reset on watchdog timer timeout; instead, call this user provider
|
||||
* timeout handler. NOTE: Providing handler==NULL will store the reset
|
||||
* behavior.
|
||||
*/
|
||||
|
||||
CODE xcpt_t (*capture)(FAR struct watchdog_lowerhalf_s *lower,
|
||||
xcpt_t handler);
|
||||
|
||||
/* An ioctl commands that are not recognized by the "upper-half" driver
|
||||
* are forwarded to the lower half driver through this method.
|
||||
*/
|
||||
|
||||
CODE int (*ioctl)(FAR struct watchdog_lowerhalf_s *lower, int cmd,
|
||||
unsigned long arg);
|
||||
};
|
||||
|
||||
/* This structure provides the publicly visible representation of the
|
||||
* "lower-half" driver state structure. "lower half" drivers will have an
|
||||
* internal structure definition that will be cast-compatible with this
|
||||
* structure definitions.
|
||||
*/
|
||||
|
||||
struct watchdog_lowerhalf_s
|
||||
{
|
||||
/* Publicly visible portion of the "lower-half" driver state structure. */
|
||||
|
||||
FAR const struct watchdog_ops_s *ops; /* Lower half operations */
|
||||
|
||||
/* The remainder of the structure is used by the "lower-half" driver
|
||||
* for whatever state storage that it may need.
|
||||
*/
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Public Data
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
#define EXTERN extern "C"
|
||||
extern "C" {
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* "Upper-Half" Watchdog Driver Interfaces
|
||||
****************************************************************************/
|
||||
/****************************************************************************
|
||||
* Name: watchdog_register
|
||||
*
|
||||
* Description:
|
||||
* This function binds an instance of a "lower half" watchdog driver with the
|
||||
* "upper half" watchdog device and registers that device so that can be used
|
||||
* by application code.
|
||||
*
|
||||
* When this function is called, the "lower half" driver should be in the
|
||||
* disabled state (as if the stop() method had already been called).
|
||||
*
|
||||
* Input parameters:
|
||||
* dev path - The full path to the driver to be registers in the NuttX
|
||||
* pseudo-filesystem. The recommended convention is to name all watchdog
|
||||
* drivers as "/dev/watchdog0", "/dev/watchdog1", etc. where the driver
|
||||
* path differs only in the "minor" number at the end of the device name.
|
||||
* lower - A pointer to an instance of lower half watchdog driver. This
|
||||
* instance is bound to the watchdog driver and must persists as long as
|
||||
* the driver persists.
|
||||
*
|
||||
* Returned Value:
|
||||
* On success, a non-NULL handle is returned to the caller. In the event
|
||||
* of any failure, a NULL value is returned.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR void *watchdog_register(FAR const char *path,
|
||||
FAR struct watchdog_lowerhalf_s *lower);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: watchdog_unregister
|
||||
*
|
||||
* Description:
|
||||
* This function can be called to disable and unregister the watchdog
|
||||
* device driver.
|
||||
*
|
||||
* Input parameters:
|
||||
* handle - This is the handle that was returned by watchdog_register()
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void watchdog_unregister(FAR void *handle);
|
||||
|
||||
/****************************************************************************
|
||||
* Platform-Independent "Lower-Half" Watchdog Driver Interfaces
|
||||
****************************************************************************/
|
||||
|
||||
#undef EXTERN
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* CONFIG_WATCHDOG */
|
||||
#endif /* __INCLUDE_NUTTX_WATCHDOG_H */
|
||||
Loading…
Reference in New Issue