php serial port communication linux kernel

But first, a more general introduction to the subject. To help you make the right decision, the following sections describe each of the three approaches as they apply to Linux-based USB devices. The correct approach for your application depends on how much time you want to spend in development and what you want the USB interface to look like to your embedded application. Specialized, but generally available, host drivers make this possible. The host application uses the USB programming interface provided with the host operating system, but otherwise behaves as though it were communicating through a typical serial port.įinally, some devices make USB look like an Ethernet network they connect the USB device to an interoffice LAN or the Internet using the host computer as a gateway. Other Linux-based USB devices use the bus as a simple, point-to-point serial connection to an application running on the host. A corresponding custom driver and applications for the USB host complete the connection.

The most ambitious and complicated devices use custom-written kernel modules to implement sophisticated, high-level protocols that run over the standard USB bus. Linux-based USB devices use one of three different strategies for communicating with USB hosts. Here are three approaches to adding USB support to an embedded system running the Linux operating system

The Universal Serial Bus is a useful communications interface and more popular than ever.

Php serial port communication linux kernel