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cortexm_common: fix bit-banding check

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Not all MCUs ≥ Cortex-M3 provide the Bit-Banding feature.
It is up to the manufacturer to implement it.

Instead, rely on the CPU_HAS_BITBAND being set in `periph_cpu.h`.
This commit is contained in:
Benjamin Valentin 2020-07-14 22:33:30 +02:00
parent e2e51ae7ef
commit 95ec5890b0
1 changed files with 1 additions and 9 deletions
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10
cpu/cortexm_common/include/bit.h
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@ -35,16 +35,8 @@ extern "C" {
#define CPU_HAS_BITBAND 1 || 0 (1 for Cortex-M3 and up, 0 for Cortex-M0)
#endif
#ifndef CPU_HAS_BITBAND
#if (__CORTEX_M >= 3)
#define CPU_HAS_BITBAND 1
#else
#define CPU_HAS_BITBAND 0
#endif
#endif
#if CPU_HAS_BITBAND || DOXYGEN
/* Cortex-M3 and higher provide a bitband address space for atomically accessing
/* Some MCUs provide a bitband address space for atomically accessing
* single bits of peripheral registers, and sometimes for RAM as well */
/**
* @name Bit manipulation functions