Texas Instruments MSP430 Student Guide

ABC’s of USB
B. Connect & Enumerate
Six States of Connection
1. USB is disconnected
→
User plugs in device
& VBUS (power) appears
2. USB Connected, not enumerated

handleVbusOnEvent()
→ App calls USB_Setup(), which
pulls PUR up
3. Enumeration in Progress
→ Enumeration succeeds
4. Device is enumerated, bus active

handleEnumCompleteEvent()
→ Host Suspends device/bus
5. Device is enum, but suspended

handleSuspendEvent()
ST_PHYS_
DISCONNECTED
ST_PHYS_
CONNECTED_
NOENUM
ST_ENUM_IN_
PROGRESS
ST_ENUM_
ACTIVE
ST_ENUM_
SUSPENDED
ST_PHYS_
CONNECTED_
NOENUM_SUSP





7 - 22 MSP430 Workshop - USB Devices

Texas Instruments MSP430 Specifications

General

Brand	Texas Instruments
Model	MSP430
Category	Microcontrollers
Language	English