USB device controller - webcam hardware info wanted
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I am learning all about low level USB devices and would like to develop "stuff" ( term used is "USB controller") to connect Arduino Due "native" port to webcam. I need to get some idea about how is webcam ( not camera ) hardware implemented. So far all searches returned "how to connect your web cam to PC". So there is an optical part ( no tech term yet) and the hardware which "connects" the optics to USB bus, right? Any info / links etc on HARDWARE will be appreciated, keep in mind this is semi-embedded processor with limited resources - no Windoze API. Thanks for your time Cheers Vaclav
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I am learning all about low level USB devices and would like to develop "stuff" ( term used is "USB controller") to connect Arduino Due "native" port to webcam. I need to get some idea about how is webcam ( not camera ) hardware implemented. So far all searches returned "how to connect your web cam to PC". So there is an optical part ( no tech term yet) and the hardware which "connects" the optics to USB bus, right? Any info / links etc on HARDWARE will be appreciated, keep in mind this is semi-embedded processor with limited resources - no Windoze API. Thanks for your time Cheers Vaclav
An USB device typically contains an intelligent controller that understands commands send from the host and prepares data from it's own hardware to be send to the host. So there is some kind of protocol that allows the communication between host and device. The handling on the host side is done by a device specific driver. This may be a common driver for well known USB device types or a specific one provided by the device manufacturer. If you want to connect USB devices to your Arduino, you must support the corresponding protocol. I don't have used an Arduino so far, but there should be examples for common devices like storages. For other devices you must write your own protocol implementation using the information provided by the device manufacturer or searching the web (Linux drivers are often a good start). So you might not need information on hardware but on the protocol used by a specific device.
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An USB device typically contains an intelligent controller that understands commands send from the host and prepares data from it's own hardware to be send to the host. So there is some kind of protocol that allows the communication between host and device. The handling on the host side is done by a device specific driver. This may be a common driver for well known USB device types or a specific one provided by the device manufacturer. If you want to connect USB devices to your Arduino, you must support the corresponding protocol. I don't have used an Arduino so far, but there should be examples for common devices like storages. For other devices you must write your own protocol implementation using the information provided by the device manufacturer or searching the web (Linux drivers are often a good start). So you might not need information on hardware but on the protocol used by a specific device.