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/> References: <bug-222665-17@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222665 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 w= as that the old code would reset the chip on open(), and now that doesn't happ= en.=20 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 sugges= ted in the ftdi datasheet, or otherwise) when the transmit side is active? --=20 You are receiving this mail because: You are the assignee for the bug.=
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