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David Kebler 2017-06-23 11:03:50 -07:00
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@ -49,72 +49,9 @@ Lots of I2C devices make use of these chips. In particular many of [Control Eve
`npm run sample`
if all went well the device should have been written to and read back and you can confirm the writes and reads were correct by looking at the console output. A more robust way to see that you've succeeded in talking to the mcp chip is the run the test suite
`npm run test`
## Using the module
and here is the code
```
const Bus = require('@uci/i2c').Bus,
MCP = require('../lib/mcp23008-17'),
// use this require when using your own code
// MCP = require('@uci/mcp')
pause = require('@uci/utils').pPause
let bus = new Bus()
let ADDR = 0x24
let CHIP = 'MCP23017'
let MS = 500 // so humans can watch the light otherwise set to zero
let PORT = 'A'
let mcp = new MCP[CHIP](bus, ADDR);
(async function () {
await mcp.init()
await mcp.allOff(PORT) // start clean
console.log('all pins off')
await pause(MS)
let pins = [1, 7, 8]
await mcp.on(pins, PORT, 'PLC')
let result = await mcp.readPort(PORT, { format: 'PLC' })
console.log(`${pins} on = current state: ${result.sort()}`)
await pause(MS)
pins = [2, 1, 6]
await mcp.toggle(pins, PORT, 'PLC')
result = await mcp.readPort(PORT, { format: 'PLC' })
console.log(`${pins} toggle = current state: ${result.sort()}`)
await pause(MS)
pins = [2, 1, 7]
await mcp.off(pins, PORT, 'PLC')
result = await mcp.readPort(PORT, { format: 'PLC' })
console.log(`${pins} off = current state: ${result.sort()}`)
await pause(MS)
console.log('all pins off')
await mcp.allOff(PORT) // clear port after each test
})()
```
if all went well the device should have been written to and read back and you can confirm the writes and reads were correct by looking at the console output. If you hook up a mcp based relay board you should see the relays being turned on and off.
Use the sample.js code as the basis for your mcp i2c project.
* [MCP23017 PDF Doc](http://www.microchip.com/wwwproducts/en/mcp23017)
* [MCP23008 PDF Doc](http://www.microchip.com/wwwproducts/en/mcp23008)