55 lines
1.5 KiB
Plaintext
Executable file
55 lines
1.5 KiB
Plaintext
Executable file
Bindings for ADC envelope detector using a DAC and a comparator
|
|
|
|
The DAC is used to find the peak level of an alternating voltage input
|
|
signal by a binary search using the output of a comparator wired to
|
|
an interrupt pin. Like so:
|
|
_
|
|
| \
|
|
input +------>-------|+ \
|
|
| \
|
|
.-------. | }---.
|
|
| | | / |
|
|
| dac|-->--|- / |
|
|
| | |_/ |
|
|
| | |
|
|
| | |
|
|
| irq|------<-------'
|
|
| |
|
|
'-------'
|
|
|
|
Required properties:
|
|
- compatible: Should be "axentia,tse850-envelope-detector"
|
|
- io-channels: Channel node of the dac to be used for comparator input.
|
|
- io-channel-names: Should be "dac".
|
|
- interrupt specification for one client interrupt,
|
|
see ../../interrupt-controller/interrupts.txt for details.
|
|
- interrupt-names: Should be "comp".
|
|
|
|
Example:
|
|
|
|
&i2c {
|
|
dpot: mcp4651-104@28 {
|
|
compatible = "microchip,mcp4651-104";
|
|
reg = <0x28>;
|
|
#io-channel-cells = <1>;
|
|
};
|
|
};
|
|
|
|
dac: dac {
|
|
compatible = "dpot-dac";
|
|
vref-supply = <®_3v3>;
|
|
io-channels = <&dpot 0>;
|
|
io-channel-names = "dpot";
|
|
#io-channel-cells = <1>;
|
|
};
|
|
|
|
envelope-detector {
|
|
compatible = "axentia,tse850-envelope-detector";
|
|
io-channels = <&dac 0>;
|
|
io-channel-names = "dac";
|
|
|
|
interrupt-parent = <&gpio>;
|
|
interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
|
|
interrupt-names = "comp";
|
|
};
|