bmRequestType

Calculate bmRequestType for USB

i.e.

• http://www.usbmadesimple.co.uk/ums_4.htm
• https://www.usb.org/sites/default/files/csm2_v1_0.pdf
• https://www.beyondlogic.org/usbnutshell/usb6.shtml

Useful combined with e.g. node-usb.

Usage

npm i bmrequesttype

const { bmRequestType, DIRECTION, TYPE, RECIPIENT } = require('bmrequesttype');
bmRequestType(DIRECTION.Out, TYPE.Class, RECIPIENT.Interface); // 33

API

bmRequestType(direction, type, recipient)

DIRECTION.Out = 0
DIRECTION.In = 1

TYPE.Standard = 0
TYPE.Class = 1
TYPE.Vendor = 2
TYPE.Reserved = 3

RECIPIENT.Device = 0
RECIPIENT.Interface = 1
RECIPIENT.Endpoint = 2
RECIPIENT.Other = 3