111 lines
4.6 KiB
C
111 lines
4.6 KiB
C
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//*****************************************************************************
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//
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// am_reg_macros.h
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//! @file
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//!
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//! @brief Helper macros for using hardware registers.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2020, Ambiq Micro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// Third party software included in this distribution is subject to the
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// additional license terms as defined in the /docs/licenses directory.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 2.4.2 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#ifndef AM_REG_MACROS_H
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#define AM_REG_MACROS_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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//*****************************************************************************
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//
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// For direct 32-bit access to a register or memory location, use AM_REGVAL:
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// AM_REGVAL(0x1234567) |= 0xDEADBEEF;
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//
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//*****************************************************************************
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#define AM_REGVAL(x) (*((volatile uint32_t *)(x)))
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#define AM_REGVAL_FLOAT(x) (*((volatile float *)(x)))
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//*****************************************************************************
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//
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// AM_REGADDR()
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// One thing CMSIS does not do well natively is to provide for static register
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// address computation. The address-of operator (e.g. &periph->reg) is helpful,
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// but does run into problems, such as when attempting to cast the resulting
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// pointer to a uint32_t. The standard C macro, offsetof() can help.
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//
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// Use AM_REGADDR() for single-module peripherals.
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// Use AM_REGADDRn() for multi-module peripherals (e.g. IOM, UART).
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//
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//*****************************************************************************
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#define AM_REGADDR(periph, reg) ( periph##_BASE + offsetof(periph##_Type, reg) )
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#define AM_REGADDRn(periph, n, reg) ( periph##0_BASE + \
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offsetof(periph##0_Type, reg) + \
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(n * (periph##1_BASE - periph##0_BASE)) )
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//*****************************************************************************
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//
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// Critical section assembly macros
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//
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// These macros implement critical section protection using inline assembly
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// for various compilers. They are intended to be used in other register
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// macros or directly in sections of code.
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//
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// Important usage note: These macros create a local scope and therefore MUST
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// be used in pairs.
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//
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//*****************************************************************************
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#define AM_CRITICAL_BEGIN \
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if ( 1 ) \
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{ \
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volatile uint32_t ui32Primask_04172010; \
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ui32Primask_04172010 = am_hal_interrupt_master_disable();
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#define AM_CRITICAL_END \
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am_hal_interrupt_master_set(ui32Primask_04172010); \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // AM_REG_MACROS_H
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