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52 lignes
1.4 KiB
52 lignes
1.4 KiB
\section{Digital Output}
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The digital output unit provides a write access to one or more pins of a \gls{GPIO} port. This unit additionally supports pulse generation on any of its pins; this is implemented in software, with timing derived from the system timebase, in order to support pulses on all pins regardless of hardware \gls{PWM} support. Pins in commands are expressed in the packed format (\ref{sec:packedpins}).
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\subsection{Digital Output Configuration}
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\begin{inicode}
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[DO:out@1]
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# Port name
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port=A
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# Pins (comma separated, supports ranges)
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pins=0
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# Initially high pins
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initial=
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# Open-drain pins
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open-drain=
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\end{inicode}
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\subsection{Digital Output Commands}
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\begin{cmdlist}
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0 & \cname{WRITE} Write to all pins
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& \begin{cmdreq}
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\cfield{u16} new value
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\end{cmdreq} \\
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1 & \cname{SET} Set selected pins to 1
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& \begin{cmdreq}
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\cfield{u16} pins to set
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\end{cmdreq} \\
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2 & \cname{CLEAR} Set selected pins to 0
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& \begin{cmdreq}
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\cfield{u16} pins to clear
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\end{cmdreq} \\
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3 & \cname{TOGGLE} Toggle selected pins
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& \begin{cmdreq}
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\cfield{u16} pins to toggle
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\end{cmdreq} \\
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4 & \cname{PULSE}
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Generate a pulse on the selected pins. The microsecond scale may be used only for 0--999\,$\mu$s.
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& \begin{cmdreq}
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\cfield{u16} pins to pulse
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\cfield{u8} active level (0, 1)
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\cfield{u8} scale: 0-ms, 1-$\mu$s
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\cfield{u16} duration
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\end{cmdreq}
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\end{cmdlist}
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