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| author | Kleidi Bujari <mail@4kb.net> | 2024-10-04 17:30:14 -0400 |
|---|---|---|
| committer | Kleidi Bujari <mail@4kb.net> | 2024-10-04 17:30:14 -0400 |
| commit | e3d457d72f59bd442a3a8d13b311d7c8444e177d (patch) | |
| tree | 96593538bb14d6791ea459a13b2d57eeadb6a1a8 /F2024/coe718/labs/lab2/bitbanding/bitband.h | |
| parent | a8d741816ce8fd86fd985e772ee2103a559fbdae (diff) | |
| download | uni-e3d457d72f59bd442a3a8d13b311d7c8444e177d.tar.gz uni-e3d457d72f59bd442a3a8d13b311d7c8444e177d.tar.bz2 uni-e3d457d72f59bd442a3a8d13b311d7c8444e177d.zip | |
labs 1,2
Diffstat (limited to 'F2024/coe718/labs/lab2/bitbanding/bitband.h')
| -rwxr-xr-x | F2024/coe718/labs/lab2/bitbanding/bitband.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/F2024/coe718/labs/lab2/bitbanding/bitband.h b/F2024/coe718/labs/lab2/bitbanding/bitband.h new file mode 100755 index 0000000..af5be4a --- /dev/null +++ b/F2024/coe718/labs/lab2/bitbanding/bitband.h @@ -0,0 +1,71 @@ +//***************************************************************************** +// +--+ +// | ++----+ +// +-++ | +// | | +// +-+--+ | +// | +--+--+ +// +----+ Copyright (c) 2011 Code Red Technologies Ltd. +// +// Header file containing C macros to provide bitbanding on Cortex-M3 MCU's +// +// Software License Agreement +// +// The software is owned by Code Red Technologies and/or its suppliers, and is +// protected under applicable copyright laws. All rights are reserved. Any +// use in violation of the foregoing restrictions may subject the user to criminal +// sanctions under applicable laws, as well as to civil liability for the breach +// of the terms and conditions of this license. +// +// THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED +// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. +// USE OF THIS SOFTWARE FOR COMMERCIAL DEVELOPMENT AND/OR EDUCATION IS SUBJECT +// TO A CURRENT END USER LICENSE AGREEMENT (COMMERCIAL OR EDUCATIONAL) WITH +// CODE RED TECHNOLOGIES LTD. +// +//***************************************************************************** + +#ifndef BITBAND_H_ +#define BITBAND_H_ + +/* The Cortex-M3 memory map includes two bit-band regions. These occupy the lowest + * 1MB of the SRAM and peripheral memory regions respectively. + * + SRAM: Bit-band region: 0x20000000 - 0x20100000 + * Bit-band alias: 0x22000000 - 0x23FFFFFF + * + PERI: Bit-band region: 0x40000000 - 0x40100000 + * Bit-band alias: 0x42000000 - 0x43FFFFFF + * The mapping formula: + * bit_word_offset = (byte_offset * 32) + (bit_number * 4) + * bit_word_address = bit_band_base + bit_word_offset + * where: + * + bit_word_offset: the position of the target bit in the bit-band memory region + * + bit_word_addr: the address of the word in the alias memory region that maps to the target bit + * + bit_band_base: the starting address of the alias region + * + byte_offset: the number of byte in the bit-band region that contains the targeted bit + * + bit_number: is the bit position (0-7) of the targeted bit + */ + +/* Bit band SRAM definitions */ +#define BITBAND_SRAM_REF 0x20000000 +#define BITBAND_SRAM_BASE 0x22000000 + +#define BITBAND_SRAM(a,b) ((BITBAND_SRAM_BASE + ((a-BITBAND_SRAM_REF)<<5) + (b<<2))) // Convert SRAM address + +/* Bit band PERIPHERAL definitions */ +#define BITBAND_PERI_REF 0x40000000 +#define BITBAND_PERI_BASE 0x42000000 + +#define BITBAND_PERI(a,b) ((BITBAND_PERI_BASE + ((a-BITBAND_PERI_REF)<<5) + (b<<2))) // Convert PERI address + +/* Basic bit band function definitions */ +#define BITBAND_SRAM_ClearBit(a,b) (*(volatile uint32_t *) (BITBAND_SRAM(a,b)) = 0) +#define BITBAND_SRAM_SetBit(a,b) (*(volatile uint32_t *) (BITBAND_SRAM(a,b)) = 1) +#define BITBAND_SRAM_GetBit(a,b) (*(volatile uint32_t *) (BITBAND_SRAM(a,b))) + +#define BITBAND_PERI_ClearBit(a,b) (*(volatile uint32_t *) (BITBAND_PERI(a,b)) = 0) +#define BITBAND_PERI_SetBit(a,b) (*(volatile uint32_t *) (BITBAND_PERI(a,b)) = 1) +#define BITBAND_PERI_GetBit(a,b) (*(volatile uint32_t *) (BITBAND_PERI(a,b))) + + +#endif /* BITBAND_H_ */ |