59 lines
2.4 KiB
C
59 lines
2.4 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2009 Piotr Esden-Tempski <piotr@esden.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBOPENSTM32_TOOLS_H
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#define LIBOPENSTM32_TOOLS_H
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/******************************************************************************
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* Register accessors / manipulators
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******************************************************************************/
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/* Get register content */
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#define GET_REG(REG) ((u16) *REG)
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/* Set register content */
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#define SET_REG(REG, VAL) (*REG = (u16)VAL)
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/* Clear register bit */
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#define CLR_REG_BIT(REG, BIT) SET_REG(REG, (~BIT))
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/* Clear register bit masking out some bits that must not be touched */
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#define CLR_REG_BIT_MSK(REG, MSK, BIT) SET_REG(REG, (GET_REG(REG) & \
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MSK & (~BIT)))
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/* Get masked out bit value */
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#define GET_REG_BIT(REG, BIT) (GET_REG(REG) & BIT)
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/*
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* Set/reset a bit in a masked window by using toggle mechanism.
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*
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* This means that we look at the bits in the bit window designated by
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* the mask. If the bit in the masked window is not matching the
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* bitmask BIT then we write 1 and if the bit in the masked window is
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* matching the bitmask BIT we write 0.
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*
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* TODO: we may need a faster implementation of that one?
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*/
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#define TOG_SET_REG_BIT_MSK(REG, MSK, BIT) { \
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register u16 toggle_mask = GET_REG(REG) & MSK; \
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register u16 bit_selector; \
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for(bit_selector = 1; bit_selector; bit_selector <<= 1){ \
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if((bit_selector & BIT) != 0) toggle_mask ^= bit_selector; \
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} \
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SET_REG(REG, toggle_mask); \
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}
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#endif /* LIBOPENSTM32_TOOLS_H */
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