Basic vanilla C boilerplate for STM32L100xC (Discovery L100C). Uses GCC. This was some class project without much practical use
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#include "common.h"
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__attribute__((always_inline))
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inline uint32_t __RBIT(uint32_t value)
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{
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register uint32_t result;
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__asm__ volatile("rbit %0, %1" : "=r"(result) : "r"(value));
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return (result);
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}
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__attribute__((always_inline))
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inline void patch_register(io32_t reg, uint32_t mask, uint32_t replacement)
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{
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*reg &= ~mask;
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*reg |= replacement << __CTZ(mask);
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}
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