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53 lines
1.4 KiB
53 lines
1.4 KiB
7 years ago
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# Digital Output
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- Direct output access to one or more pins of a port.
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- All selected pins are written simultaneously.
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- Supports generating output pulses of precise length.
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Pins are ordered in a descending order (DOWNTO) and accessed in a packed format,
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e.g. if pins 1 and 4 are selected (0b10010 on the port), the control word has
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two bits (4)(1) and e.g. 0b10 means pin 4, 0b11 both. This makes accessing the
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block of pins easier, e.g. when using them to drive a parallel bus.
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## Commands
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### WRITE
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Write a value to all defined pins.
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*Payload:*
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- u16 - new value (packed)
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### SET
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Set pins high
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*Payload:*
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- u16 - pins to set high (packed)
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### CLEAR
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Set pins low
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*Payload:*
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- u16 - pins to set low (packed)
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### TOGGLE
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Toggle selected pins (high - low)
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*Payload:*
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- u16 - pins to toggle (packed)
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### PULSE
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Send a pulse. The start will be aligned to 1 us or 1 ms (based on pulse length) of the internal timebase to ensure the highest length precision. (This alignment reduces time jitter.)
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*Payload:*
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- u16 - pins to generate the pulse on (packed)
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- u8 - pulse active level (0, 1)
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- u8 - range (0 - milliseconds, 1 - microseconds)
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- u16 - duration in the selected range
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*NOTE:* The microsecond range supports durations only up to 999 (1 ms), higher
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numbers will be divided by 1000 and use the millisecond range instead.
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## Events
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*No events defined for this unit type.*
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