44 lines
1.0 KiB
JavaScript
44 lines
1.0 KiB
JavaScript
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// to try this demo
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// npm install @uci/interrupt
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// Connect 5V MCP interrupt pin via 3.3 V logic level!!!!! converter to a gpio pin
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// Set your SETTINGS below
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// npm run inter
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const Bus = require('@uci/i2c').Bus,
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MCP = require('../src/mcp23008-17'),
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// use this require when using your own code
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// MCP = require('@uci/mcp')
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Interrupt = require('@uci/interrupt')
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let bus = new Bus()
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// SETTINGS
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let ADDR = 0x20
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let CHIP = 'MCP23017'
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let MS = 300 // so humans can watch the light otherwise set to zero
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let pinA = 12
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let pinB = 16
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let id = `${CHIP} at I2C bus address of 0x${ADDR.toString(16)}`
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async function ihandler(port) {
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let pin = await this.interruptPin(port, 'PLC')
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console.log(`handler fired for ${this.id} on port ${port} pin ${pin}`)
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await this.interruptReset(port)
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}
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let mcp = new MCP[CHIP](bus, ADDR, {
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pin_cfg_default: 'toggle_switch',
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id: id,
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interruptA: new Interrupt(pinA, ihandler),
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interruptB: new Interrupt(pinB, ihandler)
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});
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(async function () {
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await mcp.init()
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// start will start the
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await mcp.start()
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})()
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