70 lines
1.4 KiB
Markdown
70 lines
1.4 KiB
Markdown
|
# DAC Module
|
||
|
|
| Since | Origin / Contributor | Maintainer | Source |
|
||
|
|
| :----- | :-------------------- | :---------- | :------ |
|
||
|
|
| 2018-10-14 | [Arnim Läuger](https://github.com/devsaurus) | [Arnim Läuger](https://github.com/devsaurus) | [dac.c](../../../components/modules/dac.c)|
|
||
|
|
|
||
|
|
The DAC module provides access to the two built-in Digital to Analog Converters.
|
||
|
|
|
||
|
|
Each DAC is assigned to a dedicated GPIO:
|
||
|
|
- DAC channel 1 is attached to GPIO25
|
||
|
|
- DAC channel 2 is attached to GPIO26
|
||
|
|
|
||
|
|
The DACs are 8-bit, thus the output values are restricted to the range from 0 to 255.
|
||
|
|
|
||
|
|
## dac.disablee()
|
||
|
|
Disables DAC output on the related GPIO.
|
||
|
|
|
||
|
|
#### Syntax
|
||
|
|
```lua
|
||
|
|
dac.disable(channel)
|
||
|
|
```
|
||
|
|
|
||
|
|
#### Parameters
|
||
|
|
- `channel` DAC channel, one of
|
||
|
|
- `dac.CHANNEL_1`
|
||
|
|
- `dac.CHANNEL_2`
|
||
|
|
|
||
|
|
#### Returns
|
||
|
|
`nil`
|
||
|
|
|
||
|
|
An error is thrown in case of invalid parameters or if the dac failed.
|
||
|
|
|
||
|
|
|
||
|
|
## dac.enable()
|
||
|
|
Enables DAC output on the related GPIO.
|
||
|
|
|
||
|
|
#### Syntax
|
||
|
|
```lua
|
||
|
|
dac.enable(channel)
|
||
|
|
```
|
||
|
|
|
||
|
|
#### Parameters
|
||
|
|
- `channel` DAC channel, one of
|
||
|
|
- `dac.CHANNEL_1`
|
||
|
|
- `dac.CHANNEL_2`
|
||
|
|
|
||
|
|
#### Returns
|
||
|
|
`nil`
|
||
|
|
|
||
|
|
An error is thrown in case of invalid parameters or if the dac failed.
|
||
|
|
|
||
|
|
|
||
|
|
## dac.write()
|
||
|
|
Sets the output value of the DAC.
|
||
|
|
|
||
|
|
#### Syntax
|
||
|
|
```lua
|
||
|
|
dac.write(channel, value)
|
||
|
|
```
|
||
|
|
|
||
|
|
#### Parameters
|
||
|
|
- `channel` DAC channel, one of
|
||
|
|
- `dac.CHANNEL_1`
|
||
|
|
- `dac.CHANNEL_2`
|
||
|
|
- `value` output value
|
||
|
|
|
||
|
|
#### Returns
|
||
|
|
`nil`
|
||
|
|
|
||
|
|
An error is thrown in case of invalid parameters or if the dac failed.
|