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I'm playing around with prototype USB hardware, specifically the Cypress EZ-USB board. Naturally I'm frequently resetting the board, plugging and unplugging it, and running buggy firmware on the board and buggy applications code on the host. The applications code calls IOKit at application level; no kernel code is used. About once or twice a week, the USB port I am using will appear to die. The IORegistryExplorer no longer "sees" our device, and it no longer "sees" other devices plugged into that port. Powering down everything, waiting a few minutes, and powering everything up appears to restore normal operation. I am using both a Power Mac G5 and an Intel Core iMac. I've had the problem occur with both of them. I can't be sure, but I don't _think_ this is an electrical power issue. I believe that modern circuits have protective devices that are like silent solid-state circuit breakers that reset automatically, so something like this could be happening, but I don't think so. I _think_ it is only software violence that is being committed. Has anyone experienced anything like this? Does anyone know of softwares sins (or USB protocol sins) that would cause OS X to decide to quit paying attention to a USB port, or something like that? |
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