Date: Thu, 28 Sep 2017 15:11:47 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-usb@FreeBSD.org Subject: [Bug 222665] [uftdi] Cannot send anything if characters received ahead of first use of ftdi chip Message-ID: <bug-222665-17-9BfeBGuVIx@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-222665-17@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222665 Ian Lepore <ian@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open Assignee|freebsd-usb@FreeBSD.org |ian@FreeBSD.org --- Comment #3 from Ian Lepore <ian@FreeBSD.org> --- I'll look into this. I can confirm that a large change in the ftdi driver between 8.2 and 10.x was that the old code would reset the chip on open(), and now that doesn't happen. The reset was harmful for some embedded uses, such as when the chip is used in mpsse or bitbang mode. How is your rs485 transceiver connected to the ftdi? Is the transmitter connected to #TXDEN, and if so, are you using the eeprom to reconfigure that pin from RI to TXDEN? Is the receive side squelched in hardware (as suggested in the ftdi datasheet, or otherwise) when the transmit side is active? -- You are receiving this mail because: You are the assignee for the bug.help
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