Difference between revisions of "83Plus:Ports:86"

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(Added information gleaned from HDRC driver)
 
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[[Category:83Plus:Ports:By Address|86 - USB Miscellaneous Events]] [[Category:83Plus:Ports:By Name|USB Miscellaneous Events]]
 
[[Category:83Plus:Ports:By Address|86 - USB Miscellaneous Events]] [[Category:83Plus:Ports:By Name|USB Miscellaneous Events]]
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{{84P-Only Port|06}}
 
== Synopsis ==
 
== Synopsis ==
 
'''Port Number:''' 86h
 
'''Port Number:''' 86h
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'''Equivalent HDRC port:''' MGC_O_HDRC_INTRUSB (0x0A)
  
 
'''Function:''' USB Miscellaneous Events
 
'''Function:''' USB Miscellaneous Events
  
 
This port reports when various device-level USB events occur.
 
This port reports when various device-level USB events occur.
 
{{84P-Only Port|06}}
 
  
 
=== Read Values ===
 
=== Read Values ===
 
'''Reading from this port also clears it.  Remember the value you read, because you can't go back and read it again.'''
 
'''Reading from this port also clears it.  Remember the value you read, because you can't go back and read it again.'''
* Bit 0: Possibly set if the bus has been suspended (no activity for some length of time.)
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* Bit 0
* Bit 1: Unknown; probably related to HNP and/or SRP.
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** Equivalent HDRC name: MGC_M_INTR_SUSPEND, also MGC_M_INTR_EP0
* Bit 2: Set if a bus reset has occurred (both D+ and D? pulled low for some length of time.)
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** Set if the bus has been suspended (no activity for some length of time.)
* Bit 3: Unknown.
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** According to the HDRC driver, this bit is also set for endpoint 0 interrupts
* Bit 4: Possibly set if a device has been connected (D+, or maybe D?, pulled high for some length of time.)
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* Bit 1:
* Bit 5: This usually indicates that something was unplugged.
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** Equivalent HDRC name: MGC_M_INTR_RESUME
* Bit 6: Unknown; probably related to HNP.
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** (Previous text here: "Probably related to HNP and/or SRP.")
* Bit 7: This usually indicates low batteries.
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* Bit 2:
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** Equivalent HDRC name: MGC_M_INTR_RESET, also MGC_M_INTR_BABBLE
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** Set if a bus reset has occurred (both D+ and D- pulled low for some length of time.)
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** May also fire at other times
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* Bit 3:
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** Equivalent HDRC name: MGC_M_INTR_SOF
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* Bit 4:
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** Equivalent HDRC name: MGC_M_INTR_CONNECT
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** Set if a device has been connected (D+, or maybe D?, pulled high for some length of time.)
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* Bit 5:
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** Equivalent HDRC name: MGC_M_INTR_DISCONNECT
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** This usually indicates that something was unplugged.
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* Bit 6:
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** Equivalent HDRC name: MGC_M_INTR_SESSREQ
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** (Previous text here: "Probably related to HNP.")
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* Bit 7:
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** Equivalent HDRC name: MGC_M_INTR_VBUSERROR
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** In host mode, this generally means the calculator cannot provide sufficient power. Usually caused by low batteries, although, some devices cause this every time.
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** Presumably, this could also happen in peripheral mode if the host's power supply sucks, or there is too much voltage drop along the cable.  
  
 
=== Write Values ===
 
=== Write Values ===

Latest revision as of 12:58, 14 August 2013

This port only exists on the the TI-84 Plus and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 06. On the TI-83 Plus Silver Edition, this port has no effect.

Synopsis

Port Number: 86h

Equivalent HDRC port: MGC_O_HDRC_INTRUSB (0x0A)

Function: USB Miscellaneous Events

This port reports when various device-level USB events occur.

Read Values

Reading from this port also clears it. Remember the value you read, because you can't go back and read it again.

  • Bit 0
    • Equivalent HDRC name: MGC_M_INTR_SUSPEND, also MGC_M_INTR_EP0
    • Set if the bus has been suspended (no activity for some length of time.)
    • According to the HDRC driver, this bit is also set for endpoint 0 interrupts
  • Bit 1:
    • Equivalent HDRC name: MGC_M_INTR_RESUME
    • (Previous text here: "Probably related to HNP and/or SRP.")
  • Bit 2:
    • Equivalent HDRC name: MGC_M_INTR_RESET, also MGC_M_INTR_BABBLE
    • Set if a bus reset has occurred (both D+ and D- pulled low for some length of time.)
    • May also fire at other times
  • Bit 3:
    • Equivalent HDRC name: MGC_M_INTR_SOF
  • Bit 4:
    • Equivalent HDRC name: MGC_M_INTR_CONNECT
    • Set if a device has been connected (D+, or maybe D?, pulled high for some length of time.)
  • Bit 5:
    • Equivalent HDRC name: MGC_M_INTR_DISCONNECT
    • This usually indicates that something was unplugged.
  • Bit 6:
    • Equivalent HDRC name: MGC_M_INTR_SESSREQ
    • (Previous text here: "Probably related to HNP.")
  • Bit 7:
    • Equivalent HDRC name: MGC_M_INTR_VBUSERROR
    • In host mode, this generally means the calculator cannot provide sufficient power. Usually caused by low batteries, although, some devices cause this every time.
    • Presumably, this could also happen in peripheral mode if the host's power supply sucks, or there is too much voltage drop along the cable.

Write Values

  • No effect

Comments

This port is used to report various bus events, which are not associated with any particular endpoint. Note that this port (probably) only works if port 5B bit 0 is set. Port 8B might also act as a mask for this port (note that that port is normally set to A1h in host mode, and 05h in peripheral mode.)