58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/****************************************************************************
|
|
* arch/arm/src/common/arm_modifyreg8.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/spinlock.h>
|
|
|
|
#include "arm_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: modifyreg8
|
|
*
|
|
* Description:
|
|
* Atomically modify the specified bits in a memory mapped register
|
|
*
|
|
****************************************************************************/
|
|
|
|
void modifyreg8(unsigned int addr, uint8_t clearbits, uint8_t setbits)
|
|
{
|
|
irqstate_t flags;
|
|
uint8_t regval;
|
|
|
|
flags = spin_lock_irqsave(NULL);
|
|
regval = getreg8(addr);
|
|
regval &= ~clearbits;
|
|
regval |= setbits;
|
|
putreg8(regval, addr);
|
|
spin_unlock_irqrestore(NULL, flags);
|
|
}
|