190 lines
6.3 KiB
C
190 lines
6.3 KiB
C
/****************************************************************************
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* arch/arm/src/efm32/efm32_bitband.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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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/****************************************************************************
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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 "efm32_bitband.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_EFM32_BITBAND)
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#ifndef EFM32_BITBAND_PER_BASE
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# error "EFM32_BITBAND_PER_BASE not declared bitband may be not supported?"
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#endif
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#ifndef EFM32_BITBAND_RAM_BASE
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# error "EFM32_BITBAND_RAM_BASE not declared bitband may be not supported?"
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bitband_set_peripheral
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*
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* Description:
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* Perform bit-band write operation on peripheral memory location.
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*
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* Bit-banding provides atomic read-modify-write cycle for single bit
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* modification. Please refer to the reference manual for further details
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* about bit-banding.
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*
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* Note
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* This function is only atomic on cores which fully support bitbanding.
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*
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* Input Parameters:
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* addr Peripheral address location to modify bit in.
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* bit Bit position to modify, 0-31.
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* val Value to set bit to, 0 or 1.
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*
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****************************************************************************/
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inline void bitband_set_peripheral(uint32_t addr,
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uint32_t bit, uint32_t val)
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{
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uint32_t regval;
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regval = EFM32_BITBAND_PER_BASE +
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((addr - EFM32_PER_MEM_BASE) * 32) +
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(bit * 4);
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*((volatile uint32_t *)regval) = (uint32_t)val;
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}
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/****************************************************************************
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* Name: bitband_get_peripheral
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*
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* Description:
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* Perform bit-band operation on peripheral memory location.
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*
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* This function reads a single bit from the peripheral bit-band alias
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* region.
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* Bit-banding provides atomic read-modify-write cycle for single bit
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* modification. Please refer to the reference manual for further details
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* about bit-banding.
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*
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* Note
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* This function is only atomic on cores which fully support bitbanding.
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*
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* Input Parameters:
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* addr Peripheral address location to read.
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* bit Bit position to modify, 0-31.
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*
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* Returned Value:
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* Return bit value read, 0 or 1.
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*
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****************************************************************************/
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inline uint32_t bitband_get_peripheral(uint32_t addr, uint32_t bit)
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{
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uint32_t regval;
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regval = EFM32_BITBAND_PER_BASE +
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((addr - EFM32_PER_MEM_BASE) * 32) +
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(bit * 4);
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return *((volatile uint32_t *)regval);
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}
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/****************************************************************************
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* Name: bitband_set_sram
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*
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* Description:
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* Perform bit-band write operation on SRAM memory location.
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*
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* Bit-banding provides atomic read-modify-write cycle for single bit
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* modification. Please refer to the reference manual for further details
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* about bit-banding.
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*
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* Note
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* This function is only atomic on cores which fully support bitbanding.
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*
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* Input Parameters:
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* addr SRAM address location to modify bit in.
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* bit Bit position to modify, 0-31.
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* val Value to set bit to, 0 or 1.
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*
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****************************************************************************/
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inline void bitband_set_sram(uint32_t addr, uint32_t bit, uint32_t val)
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{
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uint32_t regval;
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regval = EFM32_BITBAND_RAM_BASE +
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((addr - EFM32_RAM_MEM_BASE) * 32) +
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(bit * 4);
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*((volatile uint32_t *)regval) = (uint32_t)val;
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}
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/****************************************************************************
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* Name: bitband_get_sram
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*
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* Description::
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* Perform bit-band operation on SRAM memory location.
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*
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* This function reads a single bit from the RAM bit-band alias region.
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* Bit-banding provides atomic read-modify-write cycle for single bit
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* modification. Please refer to the reference manual for further details
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* about bit-banding.
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*
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* Note
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* This function is only atomic on cores which fully support bitbanding.
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*
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* Input Parameters:
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* addr Peripheral address location to read.
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* bit Bit position to modify, 0-31.
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*
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* Returned Value:
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* Return bit value read, 0 or 1.
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*
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****************************************************************************/
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inline uint32_t bitband_get_sram(uint32_t addr, uint32_t bit)
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{
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uint32_t regval;
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regval = EFM32_BITBAND_RAM_BASE +
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((addr - EFM32_RAM_MEM_BASE) * 32) +
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(bit * 4);
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return *((volatile uint32_t *)regval);
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}
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#endif
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