From: John A. <jal...@sp...> - 2006-07-12 20:27:11
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Thanks Dave (and Chris) for the reply. I went looking for your ioctl() call in the /branches/projects/robostix/ i2c stuff and couldn't find it. Can you steer me to it? Also, block read would be for anything longer than (1) byte? Is this the SMBus limitation? Thanks again, John Alfredo -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Wednesday, July 12, 2006 9:23 AM To: General mailing list for gumstix users. Subject: Re: [Gumstix-users] Temperature sensor interfacing Hi John, > Regarding 1-wire, how are people interfacing 1-wire to the gumstix? I'm > considering several power supply devices that use 1-wire. I see that Maxim > has a number of 1-wire interface options (i2c, UART, USB, Parallel), however > I don't want to give up a UART to add 1-wire so I was leaning toward the i2c > interface. Does anybody use that (DS2482)? I'm not familiar with 1-wire, but I think you can bit-bang it using a GPIO line. > Also, (please forgive the topic branch) is SMBus unconditionally compatible > with i2c? I was hoping to hook as much stuff as possible to the i2c bus and > use one additional GPIO as an open collector shared interrupt line (since > the slave devices can initiate a transaction). Much of the new stuff out > there is SMBus. Yeah - i2c and SMBus are very closely related. SMBus typically goes over i2c but can use other transport mechanisms. Last time I looked the PXA didn't support some of the SMBus stuff (like Block-Read, and Block-Process), but these can often be emulated using the I2C_RDWR ioctl (which is what I did for the robostix stuff), and are often not used anyways. All of the the SMBus stuff that I've looked at should interface just fine with the gumstix i2c. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |