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