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BF527 - USB device is not running after load file in flash memory

Question asked by Ericles on May 20, 2011
Latest reply on May 31, 2011 by Ericles



I'm using the Ez-kit BF527, chip revision 0.0 and I'm developing a project in which the USB interface has been used.

The project is running without any errors under Debug and Release modes. But, when I generate a loader file to boot from flah memory the usb device is not detected by the host. The host show a message: that was impossible detect a ID descriptor from USB device and so, it not close a conexion.
Below I am describing the configurations enabled in my project:
  1. External memory SDRAM - 32MB;
  2. Cache Instruction;
  3. Boot mode: Flash/PROM;
  4. Boot format: Intel hex, but I have been tried the bin format, too ;
  5. Output width: 16-bit;
  6. Anything optmization is enabled;
  7. System heap:  L1 2KB;
  8. System stack: L1 2KB;
  9. User heap:     L1 8KB;
So far, I have tested load the "bulk_loopback_app_bf527" available in the path: \...Analog Devices\...\Examples... but unfortunatelly the USB device is not detected by host.
  1. I am using VisualDSP++ 5.0, update 9, but I have tryed the updates 7.
  2. The problem is not in load file (I think) because I created a simple project to blink leds and it is running when the target is started.
So, I would appreciate any suggestions to the possible cause and a possible solution for this issue.
I thank everyone in advance.