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#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
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#define AD7298_PDD (1 << 0) /* partial power down enable */
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#define AD7298_MAX_CHAN 8
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#define AD7298_STORAGE_BITS 16
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#define AD7298_INTREF_mV 2500
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#define RES_MASK(bits) ((1 << (bits)) - 1)