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STM32: Add support for Tickless mode (two timer implementation)

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This commit is contained in:
Max Neklyudov 2016-07-06 12:48:30 -06:00 committed by Gregory Nutt
parent 4d8213870c
commit d8286a7f47
9 changed files with 1483 additions and 11 deletions
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37
arch/arm/src/stm32/Kconfig
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@ -1285,6 +1285,7 @@ config STM32_LOWDENSITY
config STM32_STM32F20XX
bool
default n
select ARCH_HAVE_TICKLESS
config STM32_STM32F205
bool
@ -2166,6 +2167,42 @@ config STM32_TSC
default n
depends on STM32_STM32F30XX
config STM32_ONESHOT
bool "TIM one-shot wrapper"
default n if !SCHED_TICKLESS
default y if SCHED_TICKLESS
---help---
Enable a wrapper around the low level timer/counter functions to
support one-shot timer.
config STM32_FREERUN
bool "TIM free-running wrapper"
default n if !SCHED_TICKLESS
default y if SCHED_TICKLESS
---help---
Enable a wrapper around the low level timer/counter functions to
support a free-running timer.
if SCHED_TICKLESS
config STM32_TICKLESS_ONESHOT
int "Tickless one-shot timer channel"
default 2
range 1 14
---help---
If the Tickless OS feature is enabled, the one clock must be
assigned to provided the one-shot timer needed by the OS.
config STM32_TICKLESS_FREERUN
int "Tickless free-running timer channel"
default 5
range 1 14
---help---
If the Tickless OS feature is enabled, the one clock must be
assigned to provided the free-running timer needed by the OS.
endif
config STM32_USART1
bool "USART1"
default n

10
arch/arm/src/stm32/Make.defs
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@ -120,6 +120,16 @@ endif
ifneq ($(CONFIG_SCHED_TICKLESS),y)
CHIP_CSRCS += stm32_timerisr.c
else
CHIP_CSRCS += stm32_tickless.c
endif
ifeq ($(CONFIG_STM32_ONESHOT),y)
CHIP_CSRCS += stm32_oneshot.c
endif
ifeq ($(CONFIG_STM32_FREERUN),y)
CHIP_CSRCS += stm32_freerun.c
endif
ifeq ($(CONFIG_ARMV7M_CMNVECTOR),y)

296
arch/arm/src/stm32/stm32_freerun.c Normal file
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@ -0,0 +1,296 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_freerun.c
*
* Copyright (C) 2016 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 names NuttX nor Atmel 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <errno.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include "stm32_freerun.h"
#ifdef CONFIG_STM32_FREERUN
/****************************************************************************
* Private Functions
****************************************************************************/
static struct stm32_freerun_s *g_freerun;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_freerun_handler
*
* Description:
* Timer interrupt callback. When the freerun timer counter overflows,
* this interrupt will occur. We will just increment an overflow count.
*
* Input Parameters:
* tch - The handle that represents the timer state
* arg - An opaque argument provided when the interrupt was registered
* sr - The value of the timer interrupt status register at the time
* that the interrupt occurred.
*
* Returned Value:
* None
*
****************************************************************************/
static int stm32_freerun_handler(int irq, void *context)
{
struct stm32_freerun_s *freerun = g_freerun;
DEBUGASSERT(freerun != NULL && freerun->overflow < UINT32_MAX);
freerun->overflow++;
STM32_TIM_ACKINT(freerun->tch, 0);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_freerun_initialize
*
* Description:
* Initialize the freerun timer wrapper
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure
* chan Timer counter channel to be used.
* resolution The required resolution of the timer in units of
* microseconds. NOTE that the range is restricted to the
* range of uint16_t (excluding zero).
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_initialize(struct stm32_freerun_s *freerun, int chan,
uint16_t resolution)
{
uint32_t frequency;
tmrinfo("chan=%d resolution=%d usec\n", chan, resolution);
DEBUGASSERT(freerun != NULL && resolution > 0);
/* Get the TC frequency the corresponds to the requested resolution */
frequency = USEC_PER_SEC / (uint32_t)resolution;
freerun->frequency = frequency;
freerun->tch = stm32_tim_init(chan);
if (!freerun->tch)
{
tmrerr("ERROR: Failed to allocate TIM%d\n", chan);
return -EBUSY;
}
STM32_TIM_SETCLOCK(freerun->tch, frequency);
/* Initialize the remaining fields in the state structure and return
* success.
*/
freerun->chan = chan;
freerun->running = false;
freerun->overflow = 0;
g_freerun = freerun;
/* Set up to receive the callback when the counter overflow occurs */
STM32_TIM_SETISR(freerun->tch, stm32_freerun_handler, 0);
/* Set timer period */
STM32_TIM_SETPERIOD(freerun->tch, UINT32_MAX);
/* Start the counter */
STM32_TIM_SETMODE(freerun->tch, STM32_TIM_MODE_UP);
STM32_TIM_ACKINT(freerun->tch, 0);
STM32_TIM_ENABLEINT(freerun->tch, 0);
return OK;
}
/****************************************************************************
* Name: stm32_freerun_counter
*
* Description:
* Read the counter register of the free-running timer.
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure. This
* structure must have been previously initialized via a call to
* stm32_freerun_initialize();
* ts The location in which to return the time from the free-running
* timer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_counter(struct stm32_freerun_s *freerun,
struct timespec *ts)
{
uint64_t usec;
uint32_t counter;
uint32_t verify;
uint32_t overflow;
uint32_t sec;
int pending;
irqstate_t flags;
DEBUGASSERT(freerun && freerun->tch && ts);
/* Temporarily disable the overflow counter. NOTE that we have to be
* careful here because stm32_tc_getpending() will reset the pending
* interrupt status. If we do not handle the overflow here then, it will
* be lost.
*/
flags = irqsave();
overflow = freerun->overflow;
counter = STM32_TIM_GETCOUNTER(freerun->tch);
pending = STM32_TIM_CHECKINT(freerun->tch, 0);
verify = STM32_TIM_GETCOUNTER(freerun->tch);
/* If an interrupt was pending before we re-enabled interrupts,
* then the overflow needs to be incremented.
*/
if (pending)
{
STM32_TIM_ACKINT(freerun->tch, 0);
/* Increment the overflow count and use the value of the
* guaranteed to be AFTER the overflow occurred.
*/
overflow++;
counter = verify;
/* Update freerun overflow counter. */
freerun->overflow = overflow;
}
irqrestore(flags);
tmrinfo("counter=%lu (%lu) overflow=%lu, pending=%i\n",
(unsigned long)counter, (unsigned long)verify,
(unsigned long)overflow, pending);
tmrinfo("frequency=%u\n", freerun->frequency);
/* Convert the whole thing to units of microseconds.
*
* frequency = ticks / second
* seconds = ticks * frequency
* usecs = (ticks * USEC_PER_SEC) / frequency;
*/
usec = ((((uint64_t)overflow << 32) + (uint64_t)counter) * USEC_PER_SEC) /
freerun->frequency;
/* And return the value of the timer */
sec = (uint32_t)(usec / USEC_PER_SEC);
ts->tv_sec = sec;
ts->tv_nsec = (usec - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
tmrinfo("usec=%llu ts=(%u, %lu)\n",
usec, (unsigned long)ts->tv_sec, (unsigned long)ts->tv_nsec);
return OK;
}
/****************************************************************************
* Name: stm32_freerun_uninitialize
*
* Description:
* Stop the free-running timer and release all resources that it uses.
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure. This
* structure must have been previously initialized via a call to
* stm32_freerun_initialize();
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_uninitialize(struct stm32_freerun_s *freerun)
{
DEBUGASSERT(freerun && freerun->tch);
/* Now we can disable the timer interrupt and disable the timer. */
STM32_TIM_DISABLEINT(freerun->tch, 0);
STM32_TIM_SETMODE(freerun->tch, STM32_TIM_MODE_DISABLED);
STM32_TIM_SETISR(freerun->tch, NULL, 0);
/* Free the timer */
stm32_tim_deinit(freerun->tch);
freerun->tch = NULL;
g_freerun = NULL;
return OK;
}
#endif /* CONFIG_STM32_ONESHOT */

157
arch/arm/src/stm32/stm32_freerun.h Normal file
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@ -0,0 +1,157 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_freerun.h
*
* Copyright (C) 2016 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 __ARCH_ARM_SRC_STM32_FREERUN_H
#define __ARCH_ARM_SRC_STM32_FREERUN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <time.h>
#include "stm32_tim.h"
#ifdef CONFIG_STM32_FREERUN
/****************************************************************************
* Public Types
****************************************************************************/
/* The freerun client must allocate an instance of this structure and called
* stm32_freerun_initialize() before using the freerun facilities. The client
* should not access the contents of this structure directly since the
* contents are subject to change.
*/
struct stm32_freerun_s
{
uint8_t chan; /* The timer/counter in use */
bool running; /* True: the timer is running */
uint32_t overflow; /* Timer counter overflow */
FAR struct stm32_tim_dev_s *tch; /* Handle returned by stm32_tim_init() */
uint32_t frequency;
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: stm32_freerun_initialize
*
* Description:
* Initialize the freerun timer wrapper
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure
* chan Timer counter channel to be used.
* resolution The required resolution of the timer in units of
* microseconds. NOTE that the range is restricted to the
* range of uint16_t (excluding zero).
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_initialize(struct stm32_freerun_s *freerun, int chan,
uint16_t resolution);
/****************************************************************************
* Name: stm32_freerun_counter
*
* Description:
* Read the counter register of the free-running timer.
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure. This
* structure must have been previously initialized via a call to
* stm32_freerun_initialize();
* ts The location in which to return the time remaining on the
* oneshot timer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_counter(struct stm32_freerun_s *freerun,
struct timespec *ts);
/****************************************************************************
* Name: stm32_freerun_uninitialize
*
* Description:
* Stop the free-running timer and release all resources that it uses.
*
* Input Parameters:
* freerun Caller allocated instance of the freerun state structure. This
* structure must have been previously initialized via a call to
* stm32_freerun_initialize();
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_freerun_uninitialize(struct stm32_freerun_s *freerun);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_STM32_FREERUN */
#endif /* __ARCH_ARM_SRC_STM32_FREERUN_H */

414
arch/arm/src/stm32/stm32_oneshot.c Normal file
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@ -0,0 +1,414 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_oneshot.c
*
* Copyright (C) 2016 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 names NuttX nor Atmel 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <errno.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include "stm32_oneshot.h"
#ifdef CONFIG_STM32_ONESHOT
/****************************************************************************
* Private Date
****************************************************************************/
static struct stm32_oneshot_s *g_oneshot;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_oneshot_handler
*
* Description:
* Timer interrupt callback. When the oneshot timer interrupt expires,
* this function will be called. It will forward the call to the next
* level up.
*
* Input Parameters:
* tch - The handle that represents the timer state
* arg - An opaque argument provided when the interrupt was registered
* sr - The value of the timer interrupt status register at the time
* that the interrupt occurred.
*
* Returned Value:
* None
*
****************************************************************************/
static int stm32_oneshot_handler(int irq, void *context)
{
struct stm32_oneshot_s *oneshot = g_oneshot;
oneshot_handler_t oneshot_handler;
void *oneshot_arg;
tmrinfo("Expired...\n");
DEBUGASSERT(oneshot != NULL && oneshot->handler);
/* The clock was stopped, but not disabled when the RC match occurred.
* Disable the TC now and disable any further interrupts.
*/
STM32_TIM_SETMODE(oneshot->tch, STM32_TIM_MODE_DISABLED);
STM32_TIM_ACKINT(oneshot->tch, 0);
STM32_TIM_DISABLEINT(oneshot->tch, 0);
/* The timer is no longer running */
oneshot->running = false;
/* Forward the event, clearing out any vestiges */
oneshot_handler = (oneshot_handler_t)oneshot->handler;
oneshot->handler = NULL;
oneshot_arg = (void *)oneshot->arg;
oneshot->arg = NULL;
oneshot_handler(oneshot_arg);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_oneshot_initialize
*
* Description:
* Initialize the oneshot timer wrapper
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure
* chan Timer counter channel to be used.
* resolution The required resolution of the timer in units of
* microseconds. NOTE that the range is restricted to the
* range of uint16_t (excluding zero).
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_oneshot_initialize(struct stm32_oneshot_s *oneshot, int chan,
uint16_t resolution)
{
uint32_t frequency;
tmrinfo("chan=%d resolution=%d usec\n", chan, resolution);
DEBUGASSERT(oneshot && resolution > 0);
/* Get the TC frequency the corresponds to the requested resolution */
frequency = USEC_PER_SEC / (uint32_t)resolution;
oneshot->frequency = frequency;
oneshot->tch = stm32_tim_init(chan);
if (!oneshot->tch)
{
tmrerr("ERROR: Failed to allocate TIM%d\n", chan);
return -EBUSY;
}
STM32_TIM_SETCLOCK(oneshot->tch, frequency);
/* Initialize the remaining fields in the state structure and return
* success.
*/
oneshot->chan = chan;
oneshot->running = false;
oneshot->handler = NULL;
oneshot->arg = NULL;
g_oneshot = oneshot;
return OK;
}
/****************************************************************************
* Name: stm32_oneshot_max_delay
*
* Description:
* Determine the maximum delay of the one-shot timer (in microseconds)
*
****************************************************************************/
int stm32_oneshot_max_delay(struct stm32_oneshot_s *oneshot, uint64_t *usec)
{
DEBUGASSERT(oneshot != NULL && usec != NULL);
*usec = (uint64_t)(UINT32_MAX / oneshot->frequency) *
(uint64_t)USEC_PER_SEC;
return OK;
}
/****************************************************************************
* Name: stm32_oneshot_start
*
* Description:
* Start the oneshot timer
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure. This
* structure must have been previously initialized via a call to
* stm32_oneshot_initialize();
* handler The function to call when when the oneshot timer expires.
* arg An opaque argument that will accompany the callback.
* ts Provides the duration of the one shot timer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_oneshot_start(struct stm32_oneshot_s *oneshot,
oneshot_handler_t handler, void *arg,
const struct timespec *ts)
{
uint64_t usec;
uint64_t period;
irqstate_t flags;
tmrinfo("handler=%p arg=%p, ts=(%lu, %lu)\n",
handler, arg, (unsigned long)ts->tv_sec, (unsigned long)ts->tv_nsec);
DEBUGASSERT(oneshot && handler && ts);
DEBUGASSERT(oneshot->tch);
/* Was the oneshot already running? */
flags = irqsave();
if (oneshot->running)
{
/* Yes.. then cancel it */
tmrinfo("Already running... cancelling\n");
(void)stm32_oneshot_cancel(oneshot, NULL);
}
/* Save the new handler and its argument */
oneshot->handler = handler;
oneshot->arg = arg;
/* Express the delay in microseconds */
usec = (uint64_t)ts->tv_sec * USEC_PER_SEC +
(uint64_t)(ts->tv_nsec / NSEC_PER_USEC);
/* Get the timer counter frequency and determine the number of counts need
* to achieve the requested delay.
*
* frequency = ticks / second
* ticks = seconds * frequency
* = (usecs * frequency) / USEC_PER_SEC;
*/
period = (usec * (uint64_t)oneshot->frequency) / USEC_PER_SEC;
tmrinfo("usec=%llu period=%08llx\n", usec, period);
DEBUGASSERT(period <= UINT32_MAX);
/* Set up to receive the callback when the interrupt occurs */
STM32_TIM_SETISR(oneshot->tch, stm32_oneshot_handler, 0);
/* Set timer period */
oneshot->period = (uint32_t)period;
STM32_TIM_SETPERIOD(oneshot->tch, (uint32_t)period);
/* Start the counter */
STM32_TIM_SETMODE(oneshot->tch, STM32_TIM_MODE_PULSE);
STM32_TIM_ACKINT(oneshot->tch, 0);
STM32_TIM_ENABLEINT(oneshot->tch, 0);
/* Enable interrupts. We should get the callback when the interrupt
* occurs.
*/
oneshot->running = true;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Name: stm32_oneshot_cancel
*
* Description:
* Cancel the oneshot timer and return the time remaining on the timer.
*
* NOTE: This function may execute at a high rate with no timer running (as
* when pre-emption is enabled and disabled).
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure. This
* structure must have been previously initialized via a call to
* stm32_oneshot_initialize();
* ts The location in which to return the time remaining on the
* oneshot timer. A time of zero is returned if the timer is
* not running. ts may be zero in which case the time remaining
* is not returned.
*
* Returned Value:
* Zero (OK) is returned on success. A call to up_timer_cancel() when
* the timer is not active should also return success; a negated errno
* value is returned on any failure.
*
****************************************************************************/
int stm32_oneshot_cancel(struct stm32_oneshot_s *oneshot,
struct timespec *ts)
{
irqstate_t flags;
uint64_t usec;
uint64_t sec;
uint64_t nsec;
uint32_t count;
uint32_t period;
/* Was the timer running? */
flags = irqsave();
if (!oneshot->running)
{
/* No.. Just return zero timer remaining and successful cancellation.
* This function may execute at a high rate with no timer running
* (as when pre-emption is enabled and disabled).
*/
ts->tv_sec = 0;
ts->tv_nsec = 0;
irqrestore(flags);
return OK;
}
/* Yes.. Get the timer counter and period registers and stop the counter.
* If the counter expires while we are doing this, the counter clock will
* be stopped, but the clock will not be disabled.
*
* The expected behavior is that the the counter register will freezes at
* a value equal to the RC register when the timer expires. The counter
* should have values between 0 and RC in all other cased.
*
* REVISIT: This does not appear to be the case.
*/
tmrinfo("Cancelling...\n");
count = STM32_TIM_GETCOUNTER(oneshot->tch);
period = oneshot->period;
/* Now we can disable the interrupt and stop the timer. */
STM32_TIM_DISABLEINT(oneshot->tch, 0);
STM32_TIM_SETMODE(oneshot->tch, STM32_TIM_MODE_DISABLED);
oneshot->running = false;
oneshot->handler = NULL;
oneshot->arg = NULL;
irqrestore(flags);
/* Did the caller provide us with a location to return the time
* remaining?
*/
if (ts)
{
/* Yes.. then calculate and return the time remaining on the
* oneshot timer.
*/
tmrinfo("period=%lu count=%lu\n",
(unsigned long)period, (unsigned long)count);
/* REVISIT: I am not certain why the timer counter value sometimes
* exceeds RC. Might be a bug, or perhaps the counter does not stop
* in all cases.
*/
if (count >= period)
{
/* No time remaining (?) */
ts->tv_sec = 0;
ts->tv_nsec = 0;
}
else
{
/* The total time remaining is the difference. Convert the that
* to units of microseconds.
*
* frequency = ticks / second
* seconds = ticks * frequency
* usecs = (ticks * USEC_PER_SEC) / frequency;
*/
usec = (((uint64_t)(period - count)) * USEC_PER_SEC) /
oneshot->frequency;
/* Return the time remaining in the correct form */
sec = usec / USEC_PER_SEC;
nsec = ((usec) - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
ts->tv_sec = (time_t)sec;
ts->tv_nsec = (unsigned long)nsec;
}
tmrinfo("remaining (%lu, %lu)\n",
(unsigned long)ts->tv_sec, (unsigned long)ts->tv_nsec);
}
return OK;
}
#endif /* CONFIG_STM32_ONESHOT */

189
arch/arm/src/stm32/stm32_oneshot.h Normal file
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@ -0,0 +1,189 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_oneshot.h
*
* Copyright (C) 2016 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 __ARCH_ARM_SRC_STM32_ONESHOT_H
#define __ARCH_ARM_SRC_STM32_ONESHOT_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <time.h>
#include "stm32_tim.h"
#ifdef CONFIG_STM32_ONESHOT
/****************************************************************************
* Public Types
****************************************************************************/
/* This describes the callback function that will be invoked when the oneshot
* timer expires. The oneshot fires, the client will receive:
*
* arg - The opaque argument provided when the interrupt was registered
*/
typedef void (*oneshot_handler_t)(void *arg);
/* The oneshot client must allocate an instance of this structure and called
* stm32_oneshot_initialize() before using the oneshot facilities. The client
* should not access the contents of this structure directly since the
* contents are subject to change.
*/
struct stm32_oneshot_s
{
uint8_t chan; /* The timer/counter in use */
volatile bool running; /* True: the timer is running */
FAR struct stm32_tim_dev_s *tch; /* Pointer returned by
* stm32_tim_init() */
volatile oneshot_handler_t handler; /* Oneshot expiration callback */
volatile void *arg; /* The argument that will accompany
* the callback */
uint32_t frequency;
uint32_t period;
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: stm32_oneshot_initialize
*
* Description:
* Initialize the oneshot timer wrapper
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure
* chan Timer counter channel to be used.
* resolution The required resolution of the timer in units of
* microseconds. NOTE that the range is restricted to the
* range of uint16_t (excluding zero).
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_oneshot_initialize(struct stm32_oneshot_s *oneshot, int chan,
uint16_t resolution);
/****************************************************************************
* Name: stm32_oneshot_max_delay
*
* Description:
* Determine the maximum delay of the one-shot timer (in microseconds)
*
****************************************************************************/
int stm32_oneshot_max_delay(struct stm32_oneshot_s *oneshot, uint64_t *usec);
/****************************************************************************
* Name: stm32_oneshot_start
*
* Description:
* Start the oneshot timer
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure. This
* structure must have been previously initialized via a call to
* stm32_oneshot_initialize();
* handler The function to call when when the oneshot timer expires.
* arg An opaque argument that will accompany the callback.
* ts Provides the duration of the one shot timer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int stm32_oneshot_start(struct stm32_oneshot_s *oneshot,
oneshot_handler_t handler, void *arg,
const struct timespec *ts);
/****************************************************************************
* Name: stm32_oneshot_cancel
*
* Description:
* Cancel the oneshot timer and return the time remaining on the timer.
*
* NOTE: This function may execute at a high rate with no timer running (as
* when pre-emption is enabled and disabled).
*
* Input Parameters:
* oneshot Caller allocated instance of the oneshot state structure. This
* structure must have been previously initialized via a call to
* stm32_oneshot_initialize();
* ts The location in which to return the time remaining on the
* oneshot timer. A time of zero is returned if the timer is
* not running.
*
* Returned Value:
* Zero (OK) is returned on success. A call to up_timer_cancel() when
* the timer is not active should also return success; a negated errno
* value is returned on any failure.
*
****************************************************************************/
int stm32_oneshot_cancel(struct stm32_oneshot_s *oneshot,
struct timespec *ts);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_STM32_ONESHOT */
#endif /* __ARCH_ARM_SRC_STM32_ONESHOT_H */

350
arch/arm/src/stm32/stm32_tickless.c Normal file
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@ -0,0 +1,350 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_tickless.c
*
* Copyright (C) 2016 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.
*
****************************************************************************/
/****************************************************************************
* Tickless OS Support.
*
* When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
* is suppressed and the platform specific code is expected to provide the
* following custom functions.
*
* void up_timer_initialize(void): Initializes the timer facilities.
* Called early in the initialization sequence (by up_intialize()).
* int up_timer_gettime(FAR struct timespec *ts): Returns the current
* time from the platform specific time source.
* int up_timer_cancel(void): Cancels the interval timer.
* int up_timer_start(FAR const struct timespec *ts): Start (or re-starts)
* the interval timer.
*
* The RTOS will provide the following interfaces for use by the platform-
* specific interval timer implementation:
*
* void sched_timer_expiration(void): Called by the platform-specific
* logic when the interval timer expires.
*
****************************************************************************/
/****************************************************************************
* SAM34 Timer Usage
*
* This current implementation uses two timers: A one-shot timer to provide
* the timed events and a free running timer to provide the current time.
* Since timers are a limited resource, that could be an issue on some
* systems.
*
* We could do the job with a single timer if we were to keep the single
* timer in a free-running at all times. The STM32 timer/counters have
* 16-bit/32-bit counters with the capability to generate a compare interrupt
* when the timer matches a compare value but also to continue counting
* without stopping (giving another, different interrupt when the timer
* rolls over from 0xffffffff to zero). So we could potentially just set
* the compare at the number of ticks you want PLUS the current value of
* timer. Then you could have both with a single timer: An interval timer
* and a free-running counter with the same timer!
*
* Patches are welcome!
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <nuttx/arch.h>
#include <debug.h>
#include "stm32_oneshot.h"
#include "stm32_freerun.h"
#ifdef CONFIG_SCHED_TICKLESS
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_STM32_ONESHOT
# error CONFIG_STM32_ONESHOT must be selected for the Tickless OS option
#endif
#ifndef CONFIG_STM32_FREERUN
# error CONFIG_STM32_FREERUN must be selected for the Tickless OS option
#endif
#ifndef CONFIG_STM32_TICKLESS_FREERUN
# error CONFIG_STM32_TICKLESS_FREERUN must be selected for the Tickless OS option
#endif
#ifndef CONFIG_STM32_TICKLESS_ONESHOT
# error CONFIG_STM32_TICKLESS_ONESHOT must be selected for the Tickless OS option
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct stm32_tickless_s
{
struct stm32_oneshot_s oneshot;
struct stm32_freerun_s freerun;
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct stm32_tickless_s g_tickless;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_oneshot_handler
*
* Description:
* Called when the one shot timer expires
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* Called early in the initialization sequence before any special
* concurrency protections are required.
*
****************************************************************************/
static void stm32_oneshot_handler(void *arg)
{
tmrinfo("Expired...\n");
sched_timer_expiration();
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_timer_initialize
*
* Description:
* Initializes all platform-specific timer facilities. This function is
* called early in the initialization sequence by up_intialize().
* On return, the current up-time should be available from
* up_timer_gettime() and the interval timer is ready for use (but not
* actively timing.
*
* Provided by platform-specific code and called from the architecture-
* specific logic.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* Called early in the initialization sequence before any special
* concurrency protections are required.
*
****************************************************************************/
void up_timer_initialize(void)
{
#ifdef CONFIG_SCHED_TICKLESS_LIMIT_MAX_SLEEP
uint64_t max_delay;
#endif
int ret;
/* Initialize the one-shot timer */
ret = stm32_oneshot_initialize(&g_tickless.oneshot,
CONFIG_STM32_TICKLESS_ONESHOT,
CONFIG_USEC_PER_TICK);
if (ret < 0)
{
tmrerr("ERROR: stm32_oneshot_initialize failed\n");
PANIC();
}
#ifdef CONFIG_SCHED_TICKLESS_LIMIT_MAX_SLEEP
/* Get the maximum delay of the one-shot timer in microseconds */
ret = stm32_oneshot_max_delay(&g_tickless.oneshot, &max_delay);
if (ret < 0)
{
tmrerr("ERROR: stm32_oneshot_max_delay failed\n");
PANIC();
}
/* Convert this to configured clock ticks for use by the OS timer logic */
max_delay /= CONFIG_USEC_PER_TICK;
if (max_delay > UINT32_MAX)
{
g_oneshot_maxticks = UINT32_MAX;
}
else
{
g_oneshot_maxticks = max_delay;
}
#endif
/* Initialize the free-running timer */
ret = stm32_freerun_initialize(&g_tickless.freerun,
CONFIG_STM32_TICKLESS_FREERUN,
CONFIG_USEC_PER_TICK);
if (ret < 0)
{
tmrerr("ERROR: stm32_freerun_initialize failed\n");
PANIC();
}
}
/****************************************************************************
* Name: up_timer_gettime
*
* Description:
* Return the elapsed time since power-up (or, more correctly, since
* up_timer_initialize() was called). This function is functionally
* equivalent to:
*
* int clock_gettime(clockid_t clockid, FAR struct timespec *ts);
*
* when clockid is CLOCK_MONOTONIC.
*
* This function provides the basis for reporting the current time and
* also is used to eliminate error build-up from small errors in interval
* time calculations.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* ts - Provides the location in which to return the up-time.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* Called from the the normal tasking context. The implementation must
* provide whatever mutual exclusion is necessary for correct operation.
* This can include disabling interrupts in order to assure atomic register
* operations.
*
****************************************************************************/
int up_timer_gettime(FAR struct timespec *ts)
{
return stm32_freerun_counter(&g_tickless.freerun, ts);
}
/****************************************************************************
* Name: up_timer_cancel
*
* Description:
* Cancel the interval timer and return the time remaining on the timer.
* These two steps need to be as nearly atomic as possible.
* sched_timer_expiration() will not be called unless the timer is
* restarted with up_timer_start().
*
* If, as a race condition, the timer has already expired when this
* function is called, then that pending interrupt must be cleared so
* that up_timer_start() and the remaining time of zero should be
* returned.
*
* NOTE: This function may execute at a high rate with no timer running (as
* when pre-emption is enabled and disabled).
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* ts - Location to return the remaining time. Zero should be returned
* if the timer is not active. ts may be zero in which case the
* time remaining is not returned.
*
* Returned Value:
* Zero (OK) is returned on success. A call to up_timer_cancel() when
* the timer is not active should also return success; a negated errno
* value is returned on any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_cancel(FAR struct timespec *ts)
{
return stm32_oneshot_cancel(&g_tickless.oneshot, ts);
}
/****************************************************************************
* Name: up_timer_start
*
* Description:
* Start the interval timer. sched_timer_expiration() will be
* called at the completion of the timeout (unless up_timer_cancel
* is called to stop the timing.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* ts - Provides the time interval until sched_timer_expiration() is
* called.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_start(FAR const struct timespec *ts)
{
return stm32_oneshot_start(&g_tickless.oneshot, stm32_oneshot_handler, NULL, ts);
}
#endif /* CONFIG_SCHED_TICKLESS */

34
arch/arm/src/stm32/stm32_tim.c
View File

@ -538,6 +538,12 @@ static void stm32_tim_setperiod(FAR struct stm32_tim_dev_s *dev,
stm32_putreg32(dev, STM32_BTIM_ARR_OFFSET, period);
}
static uint32_t stm32_tim_getcounter(FAR struct stm32_tim_dev_s *dev)
{
DEBUGASSERT(dev != NULL);
return stm32_getreg32(dev, STM32_BTIM_CNT_OFFSET);
}
static int stm32_tim_setisr(FAR struct stm32_tim_dev_s *dev,
int (*handler)(int irq, void *context),
int source)
@ -679,6 +685,12 @@ static void stm32_tim_ackint(FAR struct stm32_tim_dev_s *dev, int source)
stm32_putreg16(dev, STM32_BTIM_SR_OFFSET, ~ATIM_SR_UIF);
}
static int stm32_tim_checkint(FAR struct stm32_tim_dev_s *dev, int source)
{
uint16_t regval = stm32_getreg16(dev, STM32_BTIM_SR_OFFSET);
return (regval & ATIM_SR_UIF) ? 1 : 0;
}
/************************************************************************************
* General Functions
************************************************************************************/
@ -1324,16 +1336,18 @@ static int stm32_tim_getcapture(FAR struct stm32_tim_dev_s *dev, uint8_t channel
struct stm32_tim_ops_s stm32_tim_ops =
{
.setmode = &stm32_tim_setmode,
.setclock = &stm32_tim_setclock,
.setperiod = &stm32_tim_setperiod,
.setchannel = &stm32_tim_setchannel,
.setcompare = &stm32_tim_setcompare,
.getcapture = &stm32_tim_getcapture,
.setisr = &stm32_tim_setisr,
.enableint = &stm32_tim_enableint,
.disableint = &stm32_tim_disableint,
.ackint = &stm32_tim_ackint
.setmode = stm32_tim_setmode,
.setclock = stm32_tim_setclock,
.setperiod = stm32_tim_setperiod,
.getcounter = stm32_tim_getcounter,
.setchannel = stm32_tim_setchannel,
.setcompare = stm32_tim_setcompare,
.getcapture = stm32_tim_getcapture,
.setisr = stm32_tim_setisr,
.enableint = stm32_tim_enableint,
.disableint = stm32_tim_disableint,
.ackint = stm32_tim_ackint,
.checkint = stm32_tim_checkint,
};
#ifdef CONFIG_STM32_TIM1

7
arch/arm/src/stm32/stm32_tim.h
View File

@ -6,7 +6,7 @@
*
* With modifications and updates by:
*
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2011-2012, 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -58,6 +58,7 @@
#define STM32_TIM_SETMODE(d,mode) ((d)->ops->setmode(d,mode))
#define STM32_TIM_SETCLOCK(d,freq) ((d)->ops->setclock(d,freq))
#define STM32_TIM_SETPERIOD(d,period) ((d)->ops->setperiod(d,period))
#define STM32_TIM_GETCOUNTER(d) ((d)->ops->getcounter(d))
#define STM32_TIM_SETCHANNEL(d,ch,mode) ((d)->ops->setchannel(d,ch,mode))
#define STM32_TIM_SETCOMPARE(d,ch,comp) ((d)->ops->setcompare(d,ch,comp))
#define STM32_TIM_GETCAPTURE(d,ch) ((d)->ops->getcapture(d,ch))
@ -65,6 +66,7 @@
#define STM32_TIM_ENABLEINT(d,s) ((d)->ops->enableint(d,s))
#define STM32_TIM_DISABLEINT(d,s) ((d)->ops->disableint(d,s))
#define STM32_TIM_ACKINT(d,s) ((d)->ops->ackint(d,s))
#define STM32_TIM_CHECKINT(d,s) ((d)->ops->checkint(d,s))
/************************************************************************************
* Public Types
@ -159,6 +161,8 @@ struct stm32_tim_ops_s
int (*setclock)(FAR struct stm32_tim_dev_s *dev, uint32_t freq);
void (*setperiod)(FAR struct stm32_tim_dev_s *dev, uint32_t period);
uint32_t (*getcounter)(FAR struct stm32_tim_dev_s *dev);
/* General and Advanced Timers Adds */
int (*setchannel)(FAR struct stm32_tim_dev_s *dev, uint8_t channel, stm32_tim_channel_t mode);
@ -171,6 +175,7 @@ struct stm32_tim_ops_s
void (*enableint)(FAR struct stm32_tim_dev_s *dev, int source);
void (*disableint)(FAR struct stm32_tim_dev_s *dev, int source);
void (*ackint)(FAR struct stm32_tim_dev_s *dev, int source);
int (*checkint)(FAR struct stm32_tim_dev_s *dev, int source);
};
/************************************************************************************