a9e2195e65
That field is never used and, in most cases, is never initialized correctly. This should have no impact to anything with the possible exception of free-running drivers. Verified using CI builds only.
147 lines
5.1 KiB
C
147 lines
5.1 KiB
C
/****************************************************************************
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* arch/arm/src/samv7/sam_freerun.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAMV7_SAM_FREERUN_H
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#define __ARCH_ARM_SRC_SAMV7_SAM_FREERUN_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include "sam_tc.h"
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#ifdef CONFIG_SAMV7_FREERUN
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define FREERUN_INITIALIZED(s) (((s)->tch) != NULL)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* The freerun client must allocate an instance of this structure and called
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* sam_freerun_initialize() before using the freerun facilities. The client
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* should not access the contents of this structure directly since the
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* contents are subject to change.
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*/
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struct sam_freerun_s
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{
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uint8_t chan; /* The timer/counter in use */
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uint32_t overflow; /* Timer counter overflow */
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TC_HANDLE tch; /* Handle returned by sam_tc_initialize() */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: sam_freerun_initialize
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*
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* Description:
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* Initialize the freerun timer wrapper
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*
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* Input Parameters:
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* freerun Caller allocated instance of the freerun state structure
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* chan Timer counter channel to be used. See the TC_CHAN*
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* definitions in arch/arm/src/samv7/sam_tc.h.
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* resolution The required resolution of the timer in units of
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* microseconds. NOTE that the range is restricted to the
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* range of uint16_t (excluding zero).
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int sam_freerun_initialize(struct sam_freerun_s *freerun, int chan,
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uint16_t resolution);
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/****************************************************************************
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* Name: sam_freerun_counter
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*
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* Description:
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* Read the counter register of the free-running timer.
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*
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* Input Parameters:
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* freerun Caller allocated instance of the freerun state structure. This
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* structure must have been previously initialized via a call to
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* sam_freerun_initialize();
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* ts The location in which to return the time remaining on the
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* oneshot timer.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int sam_freerun_counter(struct sam_freerun_s *freerun, struct timespec *ts);
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/****************************************************************************
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* Name: sam_freerun_uninitialize
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*
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* Description:
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* Stop the free-running timer and release all resources that it uses.
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*
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* Input Parameters:
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* freerun Caller allocated instance of the freerun state structure. This
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* structure must have been previously initialized via a call to
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* sam_freerun_initialize();
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int sam_freerun_uninitialize(struct sam_freerun_s *freerun);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_SAMV7_FREERUN */
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#endif /* __ARCH_ARM_SRC_SAMV7_SAM_FREERUN_H */
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