1.8 KiB
1.8 KiB
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
channel0~7, sigma-delta channel index
Returns
nil
sigma_delta.setprescale()
Sets the prescale value.
Syntax
`sigma_delta.setprescale(channel, value)
Parameters
channel0~7, sigma-delta channel indexvalueprescale 1 to 255
Returns
nil
See also
sigma_delta.setduty()
Sets the duty value.
Syntax
sigma_delta.setduty(channel, value)
Parameters
channel0~7, sigma-delta channel indexvalueduty -128 to 127
Returns
nil
See also
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
channel0~7, sigma-delta channel indexpinIO index, see GPIO Overview
Returns
nil
Example
sigma_delta.setprescale(0, 128)
sigma_delta.setduty(0, 0)
sigma_delta.setup(0, 4)