How do I hard-reset usb on beagle-bone with Angstrom distribution

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1

Hi I am using a beagle-bone A6a with angstrom linux,

we have a usbreset script compiled from here.

#include <stdio.h>
#include <usb.h>

int main(void)
{
      struct usb_bus *busses;
      usb_init();
      usb_find_busses();
      usb_find_devices();
      busses = usb_get_busses();
      struct usb_bus *bus;
      int c, i, a;
      /* ... */
      for (bus = busses; bus; bus = bus->next) {
        struct usb_device *dev;
        int val;
        usb_dev_handle *junk;
        for (dev = bus->devices; dev; dev = dev->next) {
          char buf[1024];
          junk = usb_open ( dev );
          usb_get_string_simple(junk,2,buf,1023);
          if ( junk == NULL ){
            printf("Can't open %p (%s)\n", dev, buf );
          } else {
            val = usb_reset(junk);
            printf( "reset %p %d (%s)\n", dev, val, buf );
          }
          usb_close(junk);
        }
      }
}



It generates output like this



[ 2422.917305] usb 1-1: reset high-speed USB device number 19 using musb-hdrc
[ 2423.080278] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
Reset successful




however it is not actually successfully hard-resetting.



Does anyone know how to hard powercycle the usb host controller?
2

Hey,

did you have any success with the usb hard reset issue?

Regards,
Michael