Sigma-delta Module¶

Since	Origin / Contributor	Maintainer	Source
2017-01-13	Arnim Läuger	Arnim Läuger	sigma_delta.c

This module provides access to the sigma-delta component. It's a hardware signal generator that can be routed to any of the output GPIOs.

The signal generation is controlled by the setprescale() and setduty() functions.

sigma_delta.close()¶

Reenables GPIO functionality at the related pin.

Syntax¶

sigma_delta.close(channel)

Parameters¶

• channel 0~7, sigma-delta channel index

Returns¶

nil

sigma_delta.setprescale()¶

Sets the prescale value.

Syntax¶

sigma_delta.setprescale(channel, value)

Parameters¶

• channel 0~7, sigma-delta channel index
• value prescale 1 to 255

Returns¶

nil

See also¶

sigma_delta.setduty()

sigma_delta.setduty()¶

Sets the duty value.

Syntax¶

sigma_delta.setduty(channel, value)

Parameters¶

• channel 0~7, sigma-delta channel index
• value duty -128 to 127

Returns¶

nil

See also¶

sigma_delta.setprescale()

sigma_delta.setup()¶

Routes the sigma-delta channel to the specified pin. Target prescale and duty values should be applied prior to enabling the output with this command.

Syntax¶

sigma_delta.setup(channel, pin)

Parameters¶

• channel 0~7, sigma-delta channel index
• pin IO index, see GPIO Overview

Returns¶

nil

Example¶

sigma_delta.setprescale(0, 128)
sigma_delta.setduty(0, 0)
sigma_delta.setup(0, 4)