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Previously, all register access macros could be used as expressions, so the following was allowed::
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Previously, all register access macros could be used as expressions, so the following was allowed::
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In ESP-IDF v5.0, register access macros which write or read-modify-write the register can no longer be used as expressions, and can only be used as statements. This applies to the following macros: ``REG_WRITE``, ``REG_SET_BIT``, ``REG_CLR_BIT``, ``REG_SET_BITS``, ``REG_SET_FIELD``, ``WRITE_PERI_REG``, ``CLEAR_PERI_REG_MASK``, ``SET_PERI_REG_MASK``, ``SET_PERI_REG_BITS``.
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In ESP-IDF v5.0, register access macros which write or read-modify-write the register can no longer be used as expressions, and can only be used as statements. This applies to the following macros: ``REG_WRITE``, ``REG_SET_BIT``, ``REG_CLR_BIT``, ``REG_SET_BITS``, ``REG_SET_FIELD``, ``WRITE_PERI_REG``, ``CLEAR_PERI_REG_MASK``, ``SET_PERI_REG_MASK``, ``SET_PERI_REG_BITS``.
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To get the value of the register after modification (which may be different from the value written), add an explicit read::
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To get the value of the register after modification (which may be different from the value written), add an explicit read::
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