| Christina Quast | 53b2105 | 2014-12-09 15:34:35 +0100 | [diff] [blame] | 1 | /* ---------------------------------------------------------------------------- |
| 2 | * ATMEL Microcontroller Software Support |
| 3 | * ---------------------------------------------------------------------------- |
| 4 | * Copyright (c) 2009, Atmel Corporation |
| 5 | * |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * - Redistributions of source code must retain the above copyright notice, |
| 12 | * this list of conditions and the disclaimer below. |
| 13 | * |
| 14 | * Atmel's name may not be used to endorse or promote products derived from |
| 15 | * this software without specific prior written permission. |
| 16 | * |
| 17 | * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE |
| 20 | * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
| 23 | * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 24 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 25 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| 26 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * ---------------------------------------------------------------------------- |
| 28 | */ |
| 29 | |
| 30 | #ifndef _BITBANDING_ |
| 31 | #define _BITBANDING_ |
| 32 | |
| 33 | /*---------------------------------------------------------------------------- |
| 34 | * \file bitbanding.h |
| 35 | * Include Defines & macros for bit-banding. |
| 36 | *----------------------------------------------------------------------------*/ |
| 37 | |
| 38 | /*---------------------------------------------------------------------------- |
| 39 | * Header files |
| 40 | *----------------------------------------------------------------------------*/ |
| 41 | |
| 42 | #include <stdint.h> |
| 43 | |
| 44 | /*---------------------------------------------------------------------------- |
| 45 | * Global Macros |
| 46 | *----------------------------------------------------------------------------*/ |
| 47 | |
| 48 | /** |
| 49 | * \brief Check if the address is in bit banding sram region. |
| 50 | * |
| 51 | * \note The address should be in area of 0x2000000 ~ 0x200FFFFF |
| 52 | * |
| 53 | * \param x The address to check. |
| 54 | */ |
| 55 | #define IS_BITBAND_SRAM_ADDR(x) \ |
| 56 | ( ((uint32_t)(x)) >= 0x20000000 && \ |
| 57 | ((uint32_t)(x)) < (0x20000000+0x100000) ) |
| 58 | |
| 59 | /** |
| 60 | * \brief Check if the address is in bit banding peripheral region |
| 61 | * |
| 62 | * \note The address should be in area of 0x4000000 ~ 0x400FFFFF |
| 63 | * \param x The address to check |
| 64 | */ |
| 65 | #define IS_BITBAND_PERIPH_ADDR(x) \ |
| 66 | ( ((uint32_t)(x)) >= 0x40000000 && \ |
| 67 | ((uint32_t)(x)) < (0x40000000+0x100000) ) |
| 68 | |
| 69 | /** |
| 70 | * \brief Calculate bit band alias address. |
| 71 | * |
| 72 | * Calculate the bit band alias address and return a pointer address to word. |
| 73 | * |
| 74 | * \param addr The byte address of bitbanding bit. |
| 75 | * \param bit The bit position of bitbanding bit. |
| 76 | * \callergraph |
| 77 | */ |
| 78 | #define BITBAND_ALIAS_ADDRESS(addr, bit) \ |
| 79 | ((volatile uint32_t*)((((uint32_t)(addr) & 0xF0000000) + 0x02000000) \ |
| 80 | +((((uint32_t)(addr)&0xFFFFF)*32)\ |
| 81 | +( (uint32_t)(bit)*4)))) |
| 82 | |
| 83 | /** |
| 84 | * \brief Bit write through bit banding. |
| 85 | * |
| 86 | * \param addr32 32-bit aligned byte address where the bit exists. |
| 87 | * \param bit Bit position. |
| 88 | * \param val The value that the bit is set to. |
| 89 | * \callergraph |
| 90 | */ |
| 91 | #define WRITE_BITBANDING(addr32, bit, val) do {\ |
| 92 | *BITBAND_ALIAS_ADDRESS(addr32,bit) = (val); \ |
| 93 | } while (0); |
| 94 | |
| 95 | /** |
| 96 | * \brief Toggle bit through bit banding |
| 97 | * |
| 98 | * \param addr32 32-bit aligned byte address where the bit exists. |
| 99 | * \param bit Bit position. |
| 100 | */ |
| 101 | #define TOGGLE_BITBANDING(addr32, bit) do {\ |
| 102 | volatile uint32_t * p = \ |
| 103 | BITBAND_ALIAS_ADDRESS(addr32,bit); \ |
| 104 | if (*p) *p = 0; \ |
| 105 | else *p = 1; \ |
| 106 | }while(0); |
| 107 | |
| 108 | #endif /* #ifndef _BITBANDING_ */ |