Creating a Serial to USB driver using the Android USB Host API Using Android in Industrial Automation. Lately we have received many concerns about using the serial interface on Android Honeycomb with USB Host. The way to usually communicate with a USB Serial device in Linux, is to create a virtual serial interface and use it like a normal serial interface. For instance if you connect an FTDI controller via USB, a device devtty. USBX will be created. USB Serial Connection connects streams to Bulk Endpoints. However, behind the scenes you are actually communicating with the device using plain USB Bulk transfers. With this done its time to locate the PPS output with a scope. It turned out to be on my module, the second pin from the left on the USB side of the GPS module. This job is done by the USB Serial driver for you ftdisio for instance. If you like to avoid using the kernel driver for some reason you can do this by using a library based on libusb called libftdi. Allen Bradley 1784PCMK Series B last downloaded 2. Users. Download Rating 83. Windows 7 drivers Allen Bradley 1784PCMK Series B free. Parts ListAtmega8 DIP microcontrollerAVR programmer usb, parallell or serial. I use usb. 12MHz Crystal osscilator. Prolific Usb Serial Controller D Driver' title='Prolific Usb Serial Controller D Driver' />If you look at the source code you will notice that this library manages the connection depending on the chip type to the serial controller. Part of this task for instance is resetting TXRX or setting the baudrate, which is not entirely trivial as it turns out. D/BF-810.GIF' alt='Prolific Usb Serial Controller D Driver' title='Prolific Usb Serial Controller D Driver' />Reading data is pretty simple if your IN packet returns more than two bytes there is data ready. While when sending data you have to be sure not to write more than the max packet size defined by the controller. For details see the source code of libftdi. Instslled_USB_to_Serial.jpg/360px-Instslled_USB_to_Serial.jpg' alt='Prolific Usb Serial Controller D Driver' title='Prolific Usb Serial Controller D Driver' />Looking at Android there is a core problem with serial devices. As shown in a previous article it is pretty complicated to get started with building the driver. However, the even more painful part is, that there is no API featured way to receive permissions for the devUSBX device node So root is required. Fiber Optic Patch Cord Sc-Sc. But Hey With libftdi, or its implementation it is now possible to write your own driver using the Android USB Host API. In the attached example application a connection to a VNC2 Controller is opened and each seconds one byte is transferred. For the example LEDs on the board are toggled. Using the Bulk OUT EP a rs. Download the Android source. Note that you should change the VIDPID String according to your device VVVV PPPP. Also note that if you would like to test if this works on your computer you should first remove the ftdisio driver using sudo rmmod ftdisio. Debugging on your Ubuntu machine Its probably much easier to debug on your workstation. Recently I found pyusb pretty helpful sudo apt get install python usb. Here is a python script that will get you started main.