Acroname USB Hub 2x4 Android Demo

2015 August 27
Acroname USB Hub 2x4 Android Demo

Below is a short video showing the Acroname USBHub2x4 controlling the data and power lines independently using Acroname's HubTool application. Notice that when the power line is enabled, the Android device indicates it as "charged". After enabling the data lines, the device then indicates that it enumerates as a media device. Doing this sort of test with HubTool is a useful and informative way to see how your device responds to USB events.

It is just as easy to do the same sort of test using your own program. Below is example C++ code which connects to the Acroname USBHub2x4, and disables device (downstream) port 0 and then re-enables it. This example shows how to programmatically control both power and data lines individually or simultaneously using the BrainStem API.

The API documentation for the USB class can be found here, as well as links to the rest of the BrainStem classes:

#include "BrainStem2/BrainStem-all.h"

int main(int argc, const char * argv[]) {
    // variables for errors and hub module class
    aErr err=aErrNone;
    aUSBHub2x4 hub;
    // look for devices on USB
    err = hub.linkDiscoverAndConnect(USB);
    // disable power and data on port 0
    // enable power and data on port 0 (single call)
    return 0;