Date: Wed, 13 Nov 2019 23:12:43 +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: <20191113221243.GB43404@cicely7.cicely.de> In-Reply-To: <23613e9d44d5efc87e305ffd82652d195dbe0e02.camel@freebsd.org> References: <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> <20191113212705.GX43404@cicely7.cicely.de> <23613e9d44d5efc87e305ffd82652d195dbe0e02.camel@freebsd.org>
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On Wed, Nov 13, 2019 at 02:34:44PM -0700, Ian Lepore wrote: > On Wed, 2019-11-13 at 22:27 +0100, Bernd Walter wrote: > > 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. > > > > Oh, there are wires/pins you have to connect to make the minimodule > work. From the datasheet, to power the module from the bus with no > independent 5v supply: > > 1) Connect VBUS to VCC (CN3, pin 1 to CN3, pin 3). This connection > takes the power from the USB bus (VBUS) and connects it to the voltage > regulator input on the FT4232H Mini Module. The voltage regulator, in > turn, provides V3V3, VPLL and VUSB power inputs to the FT4232H chip. > > 2) Connect V3V3 to VIO (CN2, pins 1, 3 & 5 to CN2, pins 11 & 21 and > CN3, pins 12 & 22). This connection provides the correct 3.3VDC > operating voltage for VCCIO on the FT4232H chip. > > I made the connections by soldering on some 30ga wires on my modules, > but you can just use dupont-wire jumpers to get going. Damn - now that is a good explanation. It is a development board after all and not blindly taking power from USB makes a whole lot of sense... Will try that later - thank you for that information. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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