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I program with LPC2368 on ARM7 architecture and will configurate usb coonection with my pc. After initialization periphery and clock, i try to start usb. I am using the following scheme fro pull-up resistor in line D+: USB connection scheme

For connection this pull-up, i change voltage-level on pin UCON from 1 to 0. After this i receive reset signal from host and message GET_DESCRIPTOR. Then i try to reply on request, but controller nothing sends. I think, problem in hardware. Maybe needed disconnect pull-up resistor after detecting my device?

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  • \$\begingroup\$ When request from host received, i make "CLEAR BUFFER" on control enpoint 0, after write all data in transmit buffer and make validate buffer, but havn't interrupt from EP0_Tx. \$\endgroup\$
    – Sauber
    Commented Oct 18, 2015 at 10:46
  • \$\begingroup\$ Show your code, you have most likely a software problem. \$\endgroup\$
    – Turbo J
    Commented Oct 18, 2015 at 17:26

1 Answer 1

Reset to default
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Maybe needed disconnect pull-up resistor after detecting my device?

No. The USB host would take this as if you disconnected your device completely.

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  • \$\begingroup\$ And if i become reset signal from hub, then needed disconnect pull-up for 10 ms or not? \$\endgroup\$
    – Sauber
    Commented Oct 18, 2015 at 12:23
  • \$\begingroup\$ Not even when you get a reset from the host. BTW: An USB reset is normal behavior in the connection sequence. Suggest reading the USB specs at least once. \$\endgroup\$
    – Turbo J
    Commented Oct 18, 2015 at 12:28
  • \$\begingroup\$ I read this documentation has at least three times, while searching for the cause \$\endgroup\$
    – Sauber
    Commented Oct 18, 2015 at 15:14

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