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| 13:35.53 | T0mW | prpplague: ping |
| 13:45.15 | prpplague | T0mW: pong |
| 13:45.34 | T0mW | prpplague: good morning, quick question about USB 2.0 |
| 13:45.58 | prpplague | T0mW: gotta run the critters to school, ask away and i'll respond when i get back |
| 13:46.20 | T0mW | prpplague: This board is a PC104 card, ATOM N450 based, and has USB 2.0 controller, can I set one USB port up as OTG? |
| 13:47.17 | prpplague | i'' have to check but i don't think n450 supports OTG, it only supports either host or slave, but not OTG functions |
| 13:47.46 | T0mW | ok, but can I set one port as slave, others as master? |
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| 13:49.36 | av500 | nobody wants otg anyway |
| 13:49.46 | av500 | just host/device |
| 13:51.09 | T0mW | av500: so, all the USB ports must be in host mode? I thought that, maybe, since the controller is USB 2.0 that it could function as a USB slave. |
| 13:51.32 | T0mW | has been doing ARM too long. |
| 13:51.41 | av500 | T0mW: no idea on n450 |
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| 14:02.15 | SpeedEvil | USB2 hosts on 'normal' devices can only ever do host mode |
| 14:02.28 | SpeedEvil | device mode/OTG is very much a 'mobile' space thing. |
| 14:03.17 | T0mW | Yeah, but doesn't the USB 2.0 spec allow for either mode of operation? Master / slave, where USB 1.0 did not. |
| 14:03.49 | T0mW | I'm thinking that if the controller is compliant, then under USB 2.0 spec, it should be able to switch roles. |
| 14:03.49 | SpeedEvil | A USB2 OTG port does. |
| 14:04.17 | SpeedEvil | Essentially all non-mobile USB2 ports are not OTG. Very much host only |
| 14:04.42 | T0mW | Well, the Minnow board has otg. |
| 14:04.55 | T0mW | Not sure if that is N550 ATOM. |
| 14:06.37 | T0mW | I've never bothered with USB before, just that the ARM controllers had it in them and I could use the port in either role. The "normal" world of PC hardware is what I've not bothered following. |
| 14:08.39 | T0mW | The product I've got here is currently setup to allow connection to an internal lighttpd server via ethernet. I use DHCP to give the client their address. That product is nearing release and is N450 based. |
| 14:09.29 | T0mW | meanwhile, I've been working at another product which is ARM920T based and uses the USB ethernet gadget for the client to access the http server. |
| 14:09.42 | T0mW | the USB gadget is a cleaner solution. |
| 14:10.07 | prpplague | T0mW: minnow does not have OTG |
| 14:10.16 | prpplague | T0mW: it has a slave(device) port |
| 14:10.32 | T0mW | prpplague: ah, that is what I want. OTG is not necessary |
| 14:10.56 | T0mW | prpplague: I need to implement a USB ethernet gadget on this board, if possible. |
| 14:10.58 | prpplague | T0mW: OTG refers to a special usb case where a single connector can be used for either slave or host depending on the cable and device connected |
| 14:11.14 | T0mW | prpplague: ok, let's forget about OTG for now. |
| 14:11.15 | prpplague | T0mW: i think you are confusing OTG with slave device |
| 14:11.21 | T0mW | no, |
| 14:11.54 | prpplague | T0mW: gadget drivers can be used with slave device with no problem |
| 14:11.56 | T0mW | would be nice to use the single port in either role: connect as gadget for config, then as host for USB drives. |
| 14:12.04 | prpplague | T0mW: ahh |
| 14:12.14 | prpplague | T0mW: yes indeed, that would require OTG |
| 14:12.28 | prpplague | T0mW: very few intel x86 devices support OTG |
| 14:12.30 | T0mW | prpplague: having said that, no, OTG is not required, but I do need the slave role. |
| 14:12.53 | T0mW | prpplague: I can use another port for the usb drives. |
| 14:13.33 | T0mW | prpplague: is it a matter of flipping a bit in the controller register and then pinout of the interface? |
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| 14:14.19 | av500 | runtime switching between host/device is also not OTG |
| 14:14.23 | T0mW | that is what I'm thinking, if the controller is USB 2.0 compliant, then it should allow the ports to function, individually, in either role: master or slave. |
| 14:14.36 | av500 | OTG is for the devices to make it out between themselves |
| 14:14.39 | T0mW | av500: understood. Not really needed |
| 14:14.43 | av500 | by talking over the wire |
| 14:16.51 | T0mW | If I cannot get OTG, then slave operation is desirable. |
| 14:17.22 | T0mW | wonders if that would be in the Intel N450 chip datasheet. |
| 14:39.37 | SpeedEvil | T0mW: Err - no. USB2 does _NOT_ imply OTG. |
| 14:40.15 | T0mW | SpeedEvil: thanks, I got that. only need slave mode on one of the ports would be ok. |
| 14:40.17 | SpeedEvil | Some USB2 ports are capable of reversing direction and becoming a device. Some subset of these can do OTG - which is a wierd voltages and currents dance. |
| 14:40.49 | SpeedEvil | Most USB2 controllers, in other than mobiles, can't do anything but host mode. |
| 14:40.54 | T0mW | hmm, ok. I know that USB is "voodoo". |
| 14:42.40 | T0mW | Of course, Intel markets this N450 as an "Embedded Solution" which means nothing in the sense as well know what "Embedded" is, to them it is "don't need a lot of extra chips". |
| 14:42.59 | av500 | embedded to them means: does not need a fan (maybe) |
| 14:43.09 | T0mW | av500: LOL |
| 14:44.04 | T0mW | or massive heat sink. I recall looking at the M68000 one time for a design and all the spec would say about heat dissapation was how many amps the processor needed for it to run. |
| 14:45.06 | av500 | to be fair, there are embeddded ARM cpus with fans too |
| 14:46.11 | SpeedEvil | My intel I3 surprisingly uses less than an amp. |
| 14:46.17 | SpeedEvil | (at 12V at idle) |
| 14:47.37 | T0mW | SpeedEvil: I get nervous when they hit 200ma. |
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| 15:18.06 | T0mW | hmm, looks like intel is getting their act together about embedded. I'm looking over the Minnow board right now. |
| 15:19.05 | av500 | wait for the intelduino |
| 15:19.37 | SpeedEvil | av500: well - yeah - great - they're sending 50000 of them out - but at what price. |
| 15:19.51 | SpeedEvil | av500: Also - x86/400MHz - not that exciting. |
| 15:19.53 | av500 | no idea |
| 15:19.59 | av500 | but but but shields! |
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