https://github.com/johntalton/mb85

Basic interface for Fujitsu MB85 FRAM chips for NodeJS
https://github.com/johntalton/mb85

fram fujitsu mb85

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Basic interface for Fujitsu MB85 FRAM chips for NodeJS

• Host: GitHub
• URL: https://github.com/johntalton/mb85
• Owner: johntalton
• License: mit
• Created: 2018-04-19T08:00:41.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2024-07-01T02:56:47.000Z (about 2 years ago)
• Last Synced: 2025-01-12T20:11:31.056Z (over 1 year ago)
• Topics: fram, fujitsu, mb85
• Language: JavaScript
• Homepage:
• Size: 49.8 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Fujitsu MB85 FRAM 

Simple wrapper around I²C (i2c-bus) implementation to provide read / write capability.

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## API

Construction is achived via the statis `from` and `fromId` methods of `MB85RC`. 

```javascript

const id = ... // detected via I²C, or user specified 

const fram = MB85RC.fromId(bus, id)

```

#### Feature string

The feature set exposed as the Fujitsu product codes.

#### `size` 

The density expressed as numeric value.

#### `densityHuman`

The density expressed as prodcut code string (example: '1M', '512K', ect)

#### `busHuman`

The bus as product code string ('RC' for I²C)

#### `read(offset, length)`

Direct access to read at an offset for desired length.

Retruning a `Promise` that resolves to a Buffer.

#### `write(offset, buffer)`

Direct write to an offset given a buffer of desired length to be writen.

Returning a `Promise` that resolves when completed.

## Devcie ID

The provided library is also provides a way of identifying a chip based on its assigned Id value.

This can be passed in, however, it becomes more usefull with the bus level `deviceId` call.  This uses a bus level discovery not supported by most chips.  By using this method, the chips feature inforamtion can detected.

```javascript

const i2c = require('i2c-bus')

const { I2CAddressedBus } = require('@johntalton/and-other-delights')

const { MB85RC, DEFAULT_MB85_ADDRESS } = require('@johntalton/mb85')

const busNumber = 1

const busAddress = DEFAULT_MB85_ADDRESS // 0x50

const bus1 = await i2c.openPromisified(busNumber)

const id = await bus1.deviceId()

const ab = new I2CAddressedBus(bus1, busAddress)

const fram = MB85RC.fromId(ab, id)

console.log('Fujitsu FRAM MB85', fram.busHuman, fram.densityHuman, fram.featuresHuman)

// Fujitsu FRAM MB85 RC 256K V

```