Date: Wed, 13 Nov 2019 22:27:06 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Ian Lepore <ian@freebsd.org> Cc: ticso@cicely.de, freebsd-arm@freebsd.org Subject: Re: Choose between Raspberry Pi 4B 4GB and ROCKPro64 Message-ID: <20191113212705.GX43404@cicely7.cicely.de> In-Reply-To: <505af93297a51a29681216be534c4ea917bb3d48.camel@freebsd.org> References: <7b75e2ed23e334878fbb3c1d585ffc51.squirrel@10.1.1.11> <20191015220433.GS96402@funkthat.com> <20191112124539.GM43404@cicely7.cicely.de> <1573571378957-0.post@n6.nabble.com> <20191112221610.GN43404@cicely7.cicely.de> <20191112225251.GB4552@funkthat.com> <20191113075343.GP43404@cicely7.cicely.de> <20191113164800.GS43404@cicely7.cicely.de> <20191113204826.GV43404@cicely7.cicely.de> <505af93297a51a29681216be534c4ea917bb3d48.camel@freebsd.org>
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On Wed, Nov 13, 2019 at 02:13:20PM -0700, Ian Lepore wrote: > On Wed, 2019-11-13 at 21:48 +0100, Bernd Walter wrote: > > > [...] > > Ok - the FT4232H mini module won't even probe on USB :-( > > I have another FT4232H, which probes fine, but has RS232 transceivers. > > A board with - I assume - a genuine CH340G shows exactly the same problem. > > Tomorrow I will hook up a logic analyzer to see what really happens on > > the wire. > > > > The 4232 minimodule claims that it needs 150ma, so it fails to attach > if connected to a bus-powered hub. (Maybe it could pull 150ma if all > channels were running max speed and driving activity LEDs, but > otherwise it more like actually uses 30-40ma.) Good point - the hub port is self powered, but it may lie. I never configured the module - probably it's not even configured into UART mode at all. but that's not the issue. I've retested at another hub port with the same result. The other module claims 200mA and probes fine. Guess my module is just broken. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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