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| 03:32.30 | b0nafide | Hello. I have an RT5350 and I want to add USB. I've only ever done TTL<->5V for serial ports. Are there good resources for adding USB to a SoC that I'm overlooking? |
| 03:33.09 | MonMotha | b0nafide: you just want to hook a serial port up to a USB host? |
| 03:33.36 | b0nafide | nope, I've already added the console serial port but I also want to populate the pads for USB |
| 03:34.15 | b0nafide | i should be able to find or step up the 3.3 to 5V for USB, but I have a nagging feeling that I've overlooking something |
| 03:34.28 | MonMotha | oh, your SoC has USB built in? |
| 03:34.38 | b0nafide | yes there are unpopulated pads |
| 03:34.57 | b0nafide | but clearly not in a position where a header belongs |
| 03:35.03 | MonMotha | well, not having a datasheet for your chip, I can't really comment on specifics |
| 03:35.23 | MonMotha | but generally, it's either ULPI (a narrow parallel bus designed to hook up to a ULPI PHY) or just hook 'er up straight to a USB port |
| 03:35.33 | MonMotha | are you wanting to be a USB "device" or a "host"? |
| 03:35.56 | b0nafide | I'll have host support, I need to supply 5V |
| 03:36.14 | MonMotha | oh, just hook 5V up to VBUS :) |
| 03:36.28 | MonMotha | optionally (recommended, though) through a little PTC thermal fuse set at ~750mA |
| 03:36.56 | MonMotha | generally you need a couple little series termination resistors on the D+/D- pair, but it will generally work without them, especially at low/full speed |
| 03:37.10 | MonMotha | the value varies with each chip, but it's typically 22-33 ohms |
| 03:37.38 | b0nafide | I have a hub torn apart I can cross reference |
| 03:37.38 | MonMotha | there exist little USB signal conditioning ICs that have that, some EMI filtering, and ESD protection all in a little 6 pin package |
| 03:37.46 | MonMotha | NUF2101, for example |
| 03:38.07 | b0nafide | cool. it all has to fit in a little helicopter :) |
| 03:38.36 | MonMotha | the datasheet for your chip should specify what you need to do if it's got a built in PHY. If it's ULPI, then you need a ULPI PHY, and that chip will specify any external parts needed. |
| 03:39.09 | MonMotha | but generally, for things with a PHY built in, a couple series resistors (and it'll often work without them, at least over short cables) and hook 'er straight up to the connector |
| 03:39.38 | b0nafide | thanks very much for the guidance. it's a bladerunner 'wifli' wireless helicopter. it runs linux and my goal is to pivotroot onto a flash drive or other media and also have a webcam |
| 03:42.55 | b0nafide | the sdk for the SoC exists, which makes it all possible, thanks ralink! |
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| 20:07.52 | gkwhc | Hi! How do y'all usually manage ARM projects with libraries like CMSIS? Should I copy all of the essential libraries to one project folder, or use the IDE and have a separate library folder? |
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