DMA Scale and Offset

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Updated2025-10-27
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Scale and offset are useful for converting the DMA FIFO value (DFV) to a usable value that corresponds to a real-world measurement.

The following table displays equations that show how scale and offset convert DFV to voltage value (VV) for read channels of different data types, and VV to DFV for write channels of different data types.


Data type	Read or Write	Equation
I8, U8, I16, U16, I32, U32, I64, U64, Boolean	Read	$V V = [D F V \times (scale \div P) + offset]$
I8, U8, I16, U16, I32, U32, I64, U64, Boolean	Write	$D F V = (V V - offset) \times (P \div scale)$
FXPI32, FXPU32,FXPI64, FXPU64	Read	$V V = (F X P V \times scale) + offset$
FXPI32, FXPU32,FXPI64, FXPU64	Write	$F X P V = (V V - offset) \div scale$
PWM	Read	$V V = [H T \div (L T + H T)] \times (scale + offset)$
PWM	Write	$H T = [(V V - offset) \div scale] \times P W M period$ $L T = P W M period - H T$
$V V$ —Represents voltage value. $D F V$ —Represents DMA FIFO value. $P$ —Represents the positive range of the data type. $F X P V$ —Represents the converted fixed-point value. $H T$ —Represents high time. $L T$ —Represents low time.

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DMA Scale and Offset

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