Date: Tue, 6 Dec 2016 08:18:13 +0000 From: Nick Hibma <Nick@ip-knowhow.com> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: Emmanuel Vadot <manu@bidouilliste.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Questions about i2c.c (TMP102 temperature sensor) Message-ID: <204B3D82-0A92-4742-98F2-8E9A5A0845BB@ip-knowhow.com> In-Reply-To: <4F71632E-2EFB-417E-898B-394E1C5CC9E8@bluezbox.com> References: <9424D7FD-C4B6-43D5-A0C5-76D5BE9ED1DE@ip-knowhow.com> <58B43D61-0B46-4310-868F-D7336585731B@bluezbox.com> <20161205094915.20847444789f803133b56af9@bidouilliste.com> <4F71632E-2EFB-417E-898B-394E1C5CC9E8@bluezbox.com>
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> I have an updated version of i2c(8) which support I2CRDWR here : >> https://github.com/evadot/freebsd/tree/i2c_rdrw/usr.sbin/i2c >> >> I didn't commit it just because I want to make I2CRDWR the default >> since there is iicbus_transfer_gen. I just need to make sure that it >> works almost everwhere (it does on allwinner board where the driver >> doesn't support I2CRDWR at least). >> >> Can you test using i2c(8) from my branch with your device ? > > It works on RPi2 with TMP102 attached. Although rdwr is off by default, > I had to pass -x option to enable that behavior. I went through I2C drivers > in HEAD and that’s iicbus methods they support (TRANSFER is the name > of the method for RDWR): > > TI: TRANSFER, RESET > i.MX: START, STOP, REPEATED START, RESET, READ, WRITE, TRANSFER > Vybrid: START, STOP, REPEATED START, RESET, READ, WRITE, TRANSFER > Exynos: START, STOP, REPEATED START, RESET, READ, WRITE, TRANSFER > Allwinner: TRANSFER, RESET > Tegra: TRANSFER, RESET > Broadcom: TRANSFER, RESET > AT91: TRANSFER, RESET > powerpc/powermac/kiic.c: TRANSFER > powerpc/mpc85xx/i2c.c: START, STOP, REPEATED START, RESET, READ, WRITE, TRANSFER > XLR: START, STOP, REPEATED START, RESET, READ, WRITE, TRANSFER > > So in theory it should work on all these platforms Bit banging over the nctgpio GPIO driver in CURRENT is the one I use. It’s part of the AMD SoC package (x86/amd64). I can’t be asked to dig into git to get at the sources, so if someone could send me a tar-ball I can test it here on a PC Engines APU board with . It guess that bit banging would be a major boost if it works for that because hackers like simple tools like i2c to combine it with rrdtool to graph their whatchamacallits to automate their bing-bong-bang-thingies. Nickhome | help
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