MCP2221

Simple library to control MCP 2221 (A) via USB.

Standard Adafruit link.

Features

Support full range of command and functionality, including:

• General Purpose
  • Digital In / Out (Gpio abstraction)
  • ADC
  • DAC
  • Clock
  • Interrupt
  • Alternate Function
• I²C
  • I2CBus abstraction
• Configuration
  • SRAM
  • FLASH
  • Status / Reset

Example

import { MCP2221A } from '@johntalton/mcp2221'

const binding: Binding = { ... }
const chip = await MCP2221A.openPromisified(binding)
const res = await chip.common.status({ opaque: 'synthetic' })

const { ch0, ch1, ch2 } = res.adc

Binding

The library attempts to abstract the nature of USB and HID away.

In doing so increases the volatility of this type (Binding) over time, while allowing for less formal dependency on any USB or HID library.

Asynchronous read and write currently make up the api surface. see examples.

API

Gpio

set

get

I²C

A middle layer I²C api that allows for flexible construction of many standard I²C and SMBus communications.

writeData

writeRepeatedSTART

writeNoSTOP

readData

readRepeatedSTART

readGetData

SRAM

The SRAM api allow for modification of the chips run-time configuration parameters. These will remain active until the chip is reset / power cycled.

• Foo
• Bar

set

get

Flash

Api access the the FLASH give access to modify the chips permanent storage.

subCommands

The FLASH api exposes several object from which to read / write

• ChipSettings
• GPSettings
• USBManufacturer
• USBProduct
• USBSerialNumber
• FactorySerial

read

write

sendPassword

Status / Reset

status

Provides convenient information about the system configuration and run-time values. Can be used to poll the chip for unique conditions.

reset