Rick Kimball RickKimball
hdznrrd
/ arm_cortex_m3_mutex.c
Created
November 7, 2012 14:42
basic implementation of a no-block / no-wait mutex for ARM Cortex M3 and compatible models
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| // this is a very basic mutex implementation | |
| // its aim is to try to acquire access to a critical section or fail. | |
| // there is no spinlock or event-waiting going on. | |
| // in case it fails to acquire the lock, it simply returns false. | |
| // | |
| // | |
| // relevant read: | |
| // | |
| // Synchronization primitives | |
| // http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0552a/BABHCIHB.html |
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| /* | |
| * Copyright (C) 2013 Ian McMahon <[email protected]> | |
| * | |
| * Virtual cape enabling SPIDEV on SPI0 on connector pins P9.22 P9.21 P9.18 P9.17 | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| /dts-v1/; |
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| [0-9a-zA-Z]{2} | |
| 30-39,41-5a,61-7a | |
| a:61 z:7a A:41 Z:5a 0:30 9:39 | |
| MSP430 alphanumeric shellcode is hard. There's no way to write to memory, | |
| no word-sized reg-reg operations, and all we have is add/sub/mov and a few conditional jumps. | |